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1. Direct Measurement of Carbon Fusion at Astrophysical Energies with Gamma-Particle Coincidences

Author

Heine M., Fruet G., Courtin S., Jenkins D.G., Adsley P., Brown A., Canavan R., Catford W.N., Charon E., Curien D., Della Negra S., Duprat J., Hammache F., Lesrel J., Lotay G., Meyer A., Monpribat E., Montanari D., Morris L., Moukaddam M., Nippert J., Podolyák Zs., Regan P.H., Ribaud I., Richer M., Rudigier M., Shearman R., de Séréville N., and Stodel C.

Subjects
Physics, QC1-999
Abstract

We present 12C+12C direct fusion measurements with STELLA UKFATIMA, that reach into the region of astrophysics interest relevant to massive stars (M⊙ ≈ 25) using self-supporting thin rotating carbon foils [1]. We demonstrate that detecting gammas and light charged particles in coincidence with nanosecond timing is key for effective background reduction achieving reliable measurements in the sub-nanobarn range. We give details about core developments of the detection apparatus as well as the coincidence-analysis procedure of low count statistics. The present data largely follows the phenomenological hindrance interpolation and shows indication for resonant behaviour at the lowest energy explored.

Published
2022
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2. Dome C UltraCarbonaceous Antarctic MicroMeteorites Infrared and Raman fingerprints

Author

Dartois, E., Engrand, C., Duprat, J., Godard, M., Charon, E., Delauche, L., Sandt, C., and Borondics, F.

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

UltraCarbonaceous Antarctic MicroMeteorites (UCAMMs) represent a small fraction of interplanetary dust particles reaching the Earth's surface and contain large amounts of an organic component not found elsewhere. They are most probably sampling a contribution from the outer regions of the solar system to the local interplanetary dust particle flux. We characterize UCAMMs composition focusing on the organic matter, and compare the results to the insoluble organic matter (IOM) from primitive meteorites, IDPs, and the Earth.We acquired synchrotron infrared microspectroscopy and micro-Raman spectra of eight UCAMMs from the Concordia/CSNSM collection, as well as N/C atomic ratios determined with an electron microprobe. The spectra are dominated by an organic component with a low aliphatic CH versus aromatic C=C ratio, and a higher nitrogen fraction and lower oxygen fraction compared to carbonaceous chondrites and IDPs. The UCAMMs carbonyl absorption band is in agreement with a ketone or aldehyde functional group. Some of the IR and Raman spectra show a C$\equiv$N band corresponding to a nitrile. The absorption band profile from 1400 to 1100 cm-1 is compatible with the presence of C-N bondings in the carbonaceous network, and is spectrally different from that reported in meteorite IOM. We confirm that the silicate-to-carbon content in UCAMMs is well below that reported in IDPs and meteorites. Together with the high nitrogen abundance relative to carbon building the organic matter matrix, the most likely scenario for the formation of UCAMMs occurs via physicochemical mechanisms taking place in a cold nitrogen rich environment, like the surface of icy parent bodies in the outer solar system. The composition of UCAMMs provides an additional hint of the presence of a heliocentric positive gradient in the C/Si and N/C abundance ratios in the solar system protoplanetary disc evolution., Comment: 12 pages, 9 figures

Published
2017
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6. Evidence of irradiation in interplanetary space in minerals from an ultracarbonaceous Antarctic micrometeorites (UCAMM)

Author

Engrand, C, Charon, E, Le- Roux, H, Marinova, M, Duprat, J, Dartois, E, Guérin, B, Rojas, J, Delauche, L, Godard, M, Troadec, David, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Centrale de Micro Nano Fabrication - IEMN (CMNF-IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Renatech Network, and Centrale de Micro Nano Fabrication - IEMN (CMNF - IEMN)

Subjects
[SDU]Sciences of the Universe [physics], [SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP]
Abstract

International audience; Introduction: Ultracarbonaceous Antarctic Micrometeorites (UCAMMs) are dominated by N-rich polyaromatic organic matter exhibiting large D enrichments [1-5]. The high abundance of organic matter exhibiting large D enrichment suggests a cometary origin for UCAMMs [1-3]. Three kinds of organic matter are identified in UCAMMs, with different nitrogen abundances and highly variable concentrations of small (typically 30-500 nanometer) mineral aggregates embedded in the organic matter [5-8]. We focus here on a mineral assemblage embedded in one UCAMM that exhibits evidence of ion irradiation, to get insight on the formation and evolution of this cometary particle. Sample and methods: A fragment of UCAMM DC06-06-43 (hereafter DC06-43) was carbon coated, observed by SEM/EDX, and a 100 nm thick FIB section of this fragment was made at IEMN Lille. The size of the initial UCAMM before fragmentation was ~ 25 x 30 µm. After STXM-XANES analysis, the mineralogy of the sample was investigated by TEM at UMET Lille using a FEI Tecnai G2 20 at 200 kV and FEI TITAN Themis at 300 kV [9]. Results : TEM examination reveals a large assemblage of crystalline minerals at the center of the DC06-43 UCAMM fragment, surrounded by organic matter (Figure 1) [9]. The assemblage consists of µm-to subµm sized Mg-rich pyroxenes, a large "triskell"-shaped Fe-sulfide, a few Mg-rich olivines, and minor Si-Al-Carich amorphous pockets and Fe-Ni metal. About 28 crystalline pyroxenes are identified whereas only 5 olivine crystals are observed in the section. GEMS are present embedded in the organic matter, close to the crystalline assemblage. We identified irradiation features (rims and tracks) in pyroxene grains. No rims or tracks were found in olivine. We observed irradiated rims around six pyroxenes at the top of the section (Figure 1, light blue labels). One pyroxene shows a continuous irradiated rim (Figure 2 top). Rim thicknesses range from 20 to 100 nm, with an average of 60 ± 20 nm (1σ) (Figure 2 bottom). Fe-rich deposits are occasionally found on top of irradiated rims. EDX mappings and profiles show that the rims are strongly depleted in Mg (Figure 3). The average track density in pyroxene grains measured over an area of 4.5 x 10-8 cm 2 is 1.3 x 10 10 cm-2 with one value at 3.8 x 10 9 cm-2 , the other values ranging from 9.5 x 10 9 to 3.2 x 10 10 cm-2 (Figure 4). Irradiation track lengths

Published
2020

7. Discrete Plio-Pleistocene phases of tilting and counterclockwise rotation in the southeastern Aegean arc (Rhodos, Greece): early Pliocene formation of the south Aegean left-lateral strike-slip system

Author

Van Hinsbergen, Douwe J.J., Krijgsman, Wout, Langereis, Cor G., Cornee, Jean-Jacques, Duermeijer, Charon E., and Van Vugt, Nicole

Subjects
Aegean Islands -- Natural history, Glacial epoch -- Research, Strike-slip faults (Geology) -- Observations, Earth sciences
Abstract

The island of Rhodos represents an uplifted block in the largely submerged southeastern Aegean forearc. It has a complex history of subsidence, uplift and counterclockwise rotation during the Plio-Pleistocene, in response to the interplay between large-scale geodynamic processes. In this paper, we present a new chronostratigraphic framework for the continental Pliocene Apolakkia basin of southwestern Rhodos. We combine these time constraints with recently published chronostratigraphic data from the marine Plio-Pleistocene basins of northeastern Rhodos to reconstruct rotational and vertical motions. Our palaeomagnetic results identify two rotation phases for Rhodos: c. 10[degrees] (9 [+ or -] 6[degrees]) counterclockwise (ccw) rotation between 3.8 and 3.6 Ma, and c. 17 [+ or -] 6[degrees] ccw rotation since 0.8 Ma. Between these phases, Rhodos tilted to the SE, drowning the southeastern coast to a depth of 500-600 m between 2.5 and 1.8 Ma, then to the NW, which resulted in the re-emergence of the drowned relief between 1.5 and 1.1 Ma. We relate the rotations of Rhodos to incipient formation of the south Aegean sinistral strike-slip system and the foundering of the Rhodos basin. The previously shown absence of Messinian evaporites in the deep-marine Rhodos basin in combination with the 3.8 Ma onset of ccw rotation of Rhodos constrains the onset of the formation of the south Aegean strike-slip system between 5.3 and 3.8 Ma. The formation of this strike-slip system is probably related to the interplay of oblique collision between the southeastern Aegean region and the northward moving African plate, the westward motion of Anatolia, gravitational spreading of the overthickened Aegean lithosphere and the recently postulated southwestward retreat of the African subducted slab along a subduction-transform edge-propagator fault.

Published
2007

8. Palaeomagnetic evolution of the Cankiri Basin (central Anatolia, Turkey): implications for oroclinal bending due to indentation

Author

Kaymakci, Nuretdin, Duermeijer, Charon E., Langereis, Cor, White, Stanley H., and Van Dijk, Paul M.

Subjects
Cankiri, Turkey -- Natural history, Paleomagnetism -- Research, Basins (Geology) -- Composition, Earth sciences
Abstract

Palaeomagnetic data in combination with palaeostress data and anisotropy of magnetic susceptibility orientations are utilized to develop a tectonic evolutionary model for the Early Tertiary part of the [OMEGA] (omega)-shaped Cankiri Basin (Turkey). The results reveal clockwise rotations in the northeast and anticlockwise rotations in the west and southeastern corner of the basin. The magnetic inclinations indicate a northward drift of the Cankiri Basin and support an indentation model for the Kirsehir Block. It is proposed that the [OMEGA]-shape of the Cankiri Basin was the result of indentation of the Kirsehir Block into the Sakarya Continent during northwards migration accompanying closure of Neotethys. It appears that the indentation started prior to Eocene and ended before Middle Miocene times. Keywords: tectonics, palaeomagnetism, magnetic declination, stress, Turkey, oroclines.

Published
2003

9. Advances in the Direct Study of Carbon Burning in Massive Stars

Author

Fruet, G., primary, Courtin, S., additional, Heine, M., additional, Jenkins, D. G., additional, Adsley, P., additional, Brown, A., additional, Canavan, R., additional, Catford, W. N., additional, Charon, E., additional, Curien, D., additional, Della Negra, S., additional, Duprat, J., additional, Hammache, F., additional, Lesrel, J., additional, Lotay, G., additional, Meyer, A., additional, Montanari, D., additional, Morris, L., additional, Moukaddam, M., additional, Nippert, J., additional, Podolyák, Zs., additional, Regan, P. H., additional, Ribaud, I., additional, Richer, M., additional, Rudigier, M., additional, Shearman, R., additional, de Séréville, N., additional, and Stodel, C., additional

Published
2020
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11. Pt, Au, Pd and Ru Partitioning Between Mineral and Silicate Melts: The Role of Metal Nanonuggets

Author

Malavergne, V, Charon, E, Jones, J, Agranier, A, and Campbell, A

Subjects
Geophysics
Abstract

The partition coefficients of Pt and other Pt Group Elements (PGE) between metal and silicate D(sub Metal-Silicate) and also between silicate minerals and silicate melts D(sub Metal-Silicate) are among the most challenging coefficients to obtain precisely. The PGE are highly siderophile elements (HSE) with D(sub Metal-Silicate) >10(exp 3) due to the fact that their concentrations in silicates are very low (ppb to ppt range). Therefore, the analytical difficulty is increased by the possible presence of HSE-rich-nuggets in reduced silicate melts during experiments). These tiny HSE nuggets complicate the interpretation of measured HSE concentrations. If the HSE micro-nuggets are just sample artifacts, then their contributions should be removed before calculations of the final concentration. On the other hand, if they are produced during the quench, then they should be included in the analysis. We still don't understand the mechanism of nugget formation well. Are they formed during the quench by precipitation from precursor species dissolved homogeneously in the melts, or are they precipitated in situ at high temperature due to oversaturation? As these elements are important tracers of early planetary processes such as core formation, it is important to take up this analytical and experimental challenge. In the case of the Earth for example, chondritic relative abundances of the HSE in some mantle xenoliths have led to the concept of the "late veneer" as a source of volatiles (such as water) and siderophiles in the silicate Earth. Silicate crystal/liquid fractionation is responsible for most, if not all, the HSE variation in the martian meteorite suites (SNC) and Pt is the element least affected by these fractionations. Therefore, in terms of reconstructing mantle HSE abundances for Mars, Pt becomes a very important player. In the present study, we have performed high temperature experiments under various redox conditions in order to determine the abundances of Pt, Au, Ru and Pd in minerals (olivine and diopside) and in silicate melts, but also to characterize the sizes, density and chemistry of HSE nuggets when present in the samples.

Published
2012

12. Croissance en une seule étape de nanotubes de carbone vericalement alignés sur des feuilles d'aluminium

Author

Charon, E., Combrisson, A, Nassoy, F, PINAULT, M, Reynaud, C, Mayne-L'Hermite, M., Laboratoire Edifices Nanométriques (LEDNA), Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M) (NIMBE UMR 3685), Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Nawatechnologies, Palacin, Serge, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Institut Rayonnement Matière de Saclay (IRAMIS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)

Subjects
[CHIM.MATE] Chemical Sciences/Material chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry
Abstract

International audience; Les tapis de nanotubes de carbone verticalement alignés (VACNT) sont des matériaux aux propriétés structurales, électriques et thermiques très intéressantes pour de nombreuses applications. La méthode de choix pour la synthèse de VACNT de haute qualité est le dépôt chimique en phase vapeur catalytique (CCVD). Cette étude porte sur la croissance de tapis de VACNT sur des substrats d'intérêt par CCVD d'aérosols à basse température. Cette méthode, développée au sein du laboratoire Edifices Nanométriques (LEDNA) consiste à injecter simultanément dans le réacteur un précurseur catalytique et un précurseur carboné de manière à générer in-situ la formation des particules catalytiques à l'origine de la croissance des VACNT. Cette méthode est un procédé de synthèse en continu, en une seule étape, simple, peu coûteux et transposable à grande échelle. Elle a été jusqu'alors développée surtout à haute température (800 à 850°C) [1-3] et récemment elle a été ajustée à la croissance sur aluminium, pour la fabrication d'électrodes de supercondensateurs, qui imposait des températures plus basses de l'ordre de 600°C [4,5]. En se basant sur des travaux antérieurs, notre procédé a été modifié par l'adjonction d'hydrogène en phase gazeuse pour favoriser la décomposition du précurseur catalytique (ferrocène) à basse température [2], et par le remplacement du précurseur carboné liquide (toluène) par l'acétylène, facile à décomposer à basse température [6]. Les résultats récents mettent en évidence une croissance de nanotubes alignés et denses à ces faibles températures avec des vitesses de croissance qui sont comparables à celles obtenues dans l'état de l'art pour des méthodes en deux étapes et assistées (plasma [7] ou filaments chauds [8]). Toutefois, une diminution de la vitesse de croissance en fonction de la durée de synthèse se traduisant par une limitation de la hauteur des tapis de VACNT a été observée [9,10]. Dans ce contexte, l'objectif principal est d'approfondir notre compréhension de la croissance des VACNT spécifiquement à basse température et d'identifier les mécanismes mis en jeu. L'enjeu étant un meilleur contrôle du procédé de croissance dans ces conditions où les phénomènes physico-chimiques à l'oeuvre peuvent être modifiés ou ralentis.

Published
2019

13. Inner Solar System Irradiation History of Minerals in an Ultracarbonaceous Antarctic Micrometeorite (UCAMM)

Author

Engrand, Cecile, Charon, E., Leroux, H., Le Guillou, C., Duprat, J., Dartois, E., Bernard, S, Guérin, Baptiste, Delauche, L., Godard, M., Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Edifices Nanométriques (LEDNA), Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M) (NIMBE UMR 3685), Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Unité Matériaux et Transformations - UMR 8207 (UMET), Institut de Chimie du CNRS (INC)-Institut National de la Recherche Agronomique (INRA)-Centre National de la Recherche Scientifique (CNRS)-Université de Lille-Ecole Nationale Supérieure de Chimie de Lille (ENSCL), Laboratoire de géologie de l'ENS (LGENS), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris, École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM AS), Université Paris-Saclay-Univ. Paris-Sud-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut d'astrophysique spatiale (IAS), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut National de la Recherche Agronomique (INRA)-Ecole Nationale Supérieure de Chimie de Lille (ENSCL)-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Univ. Paris-Sud, Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université de Lille-Ecole Nationale Supérieure de Chimie de Lille (ENSCL)-Institut National de la Recherche Agronomique (INRA), Laboratoire de géologie de l'ENS (LGE), and École normale supérieure - Paris (ENS Paris)-École normale supérieure - Paris (ENS Paris)

Subjects
[SDU]Sciences of the Universe [physics], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2019

14. Growth of vertically aligned carbon nanotubes on aluminium substrate at low temperature through a one-step thermal CVD process

Author

Combrisson, A, Nassoy, F, Pinault, M., Reynaud, C., Charon, E., Mayne-L'Hermite, M., Palacin, Serge, Laboratoire Edifices Nanométriques (LEDNA), Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M) (NIMBE UMR 3685), Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Nawatechnologies, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (IRAMIS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[CHIM.MATE] Chemical Sciences/Material chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry
Abstract

International audience; This study addresses the vertically aligned carbon nanotubes (VACNT) growth on specific substrates by thermal aerosol assisted CCVD at low temperature (LT). This one-step continuous process is based on the simultaneous injection of catalytic and carbon precursors into a reactor to form in-situ catalytic particles leading to the VACNT growth. It has initially been developed at high temperature (800-850 °C) [Pinault et al 2005, Castro et al 2013] and is easily scalable. Recently it has been adapted to grow VACNT on Al foils to fabricate ultracapacitor electrodes, requesting a lower process temperature [Nassoy thesis 2018]. According to our previous work, hydrogen adjunction in the gas phase promotes the catalyst precursor decomposition at LT. Using acetylene as a carbon precursor is more favorable for decomposition at LT. Recent results enabled to obtain clean, long and dense VACNT at LT with growth rates at the best level of state of the art for multi-step assisted CVD. However, a decrease in growth rate and a catalytic particle poisoning are observed for long time synthesis, inducing a carpet height limitation. The main goal is to strengthen our understanding of VACNT growth at LT and to identify mechanisms involved, in order to have a better control of the growth process.

Published
2019

15. Composition of Ultracarbonaceous Antarctic Micrometeorites (UCAMMs). Comparison with Rosetta/COSIMA Analyses

Author

Cecile Engrand, Dartois, E., Duprat, J., Charon, E., Leroux, H., Le Guillou, C., Bernard, S., Karim Benzerara, Sufal Swaraj, Rachid Belkhou, Delauche, L., Godard, M., Basile Augé, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut d'astrophysique spatiale (IAS), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM AS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Univ. Paris-Sud, Laboratoire Edifices Nanométriques (LEDNA), Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M) (NIMBE UMR 3685), Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Unité Matériaux et Transformations - UMR 8207 (UMET), Institut National de la Recherche Agronomique (INRA)-Ecole Nationale Supérieure de Chimie de Lille (ENSCL)-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Laboratoire de géologie de l'ENS (LGENS), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris, École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Institut de minéralogie, de physique des matériaux et de cosmochimie (IMPMC), Muséum national d'Histoire naturelle (MNHN)-Institut de recherche pour le développement [IRD] : UR206-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université de Lille-Ecole Nationale Supérieure de Chimie de Lille (ENSCL)-Institut National de la Recherche Agronomique (INRA), Laboratoire de géologie de l'ENS (LGE), École normale supérieure - Paris (ENS Paris)-École normale supérieure - Paris (ENS Paris), Université Paris-Saclay-Univ. Paris-Sud-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Institut de Chimie du CNRS (INC)-Institut National de la Recherche Agronomique (INRA)-Centre National de la Recherche Scientifique (CNRS)-Université de Lille-Ecole Nationale Supérieure de Chimie de Lille (ENSCL), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS Paris), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
[SDU]Sciences of the Universe [physics]
Abstract

International audience; Introduction: Ultracarbonaceous Antarctic Micrometeorites (UCAMMs) are dominated by a polyaromatic organic matter globally N-enriched showing bulk D enrichments, with heterogeneous distributions of the D/H and 15 N/ 14 N isotopic ratios [1-6]. The abundant organic matter of UCAMMs contains amorphous and crystalline mineral components [7-9]. This high abundance of organic matter is reminiscent of the CHON particles detected in comet 1P/Halley [10, 11], although the size of CHONs was estimated to be on the micrometer to sub-micrometer size, while UCAMMs from the Concordia collection range in size from ~ 30 µm to ~ 200 µm [12]. They most probably originate from the outer regions of the protoplanetary disk, from the cometary reservoir [1, 3, 4], thus we aim at comparing their composition with that of dust particles from comet 67P/Churyumov-Gerasimenko (hereafter 67P) measured by Ro-setta/COSIMA [13-15]. A recent summary of the general UCAMM characteristics can be found in [12]. Methods: UCAMMs from the Concordia collection were identified by SEM/EDX, and complementary UCAMM fragments were analyzed by synchrotron-based Fourier transform infrared (FTIR) microscopy at SOLEIL/SMIS, electron microprobe analysis (EMPA) at the CAMPARIS facility (Paris), transmission electron microscopy (TEM) at UMET (Lille), STXM-XANES analyses at synchrotron facilities (ALS Berkeley and SOLEIL/HERMES), NanoSIMS at MNHN Paris and Institut Curie Orsay [1, 3-6, 12, 16, 17]. Recent STXM-XANES analyses were performed at the SOLEIL/HERMES beamline on 4 additional UCAMMs. Results and discussion: The additional STXM-XANES measurements of 4 UCAMM fragments in FIB-sections confirmed the presence of 3 organic phases in UCAMMs : i) an extended (up to tens of µm) smooth N-rich organic phase with a low O content, which is devoid of crystalline phases but can occasionnaly contain Glass Embedded with Metal and Sulfides (GEMS) inclusions; ii) an organic phase similar to the insoluble organic matter (IOM) extracted from carbonaceous chondrites (with a lower N/C ratio and a O content higher than for the smooth N-rich phase mentioned above), which contains minerals, including crystalline ones; iii) an organic phase associated with "dusty-patches", which also has a low N concentration, but contains less O and shows a higher aromaticity than the previous "IOM-like" organic phase. UCAMMs analysed so far exibit various proportions of these 3 organic phases, thus showing variable bulk N contents [4, 12]. The N/C atomic ratios of individual UCAMMs varies from ~0.05 to ~ 0.20. The average N/C atomic ratio calculated from 5 UCAMMs is 2 to 3 times that of chondritic IOM. The N/C value calculated for dust particles from 67P is 0.035 ± 0.011 [14], i.e. lower than the average value of UCAMMs but still in the range of the UCAMMs with the lowest N/C atomic ratio. The C/Si atomic ratio of 67P is compatible with that of Halley dust particles and with the solar value [15]. This may indicate that the dust particles from these comets have well preserved their initial composition in semi-volatile elements. The C/Si of UCAMMs is higher than that of 67P, Halley and the Sun [4, 12], suggesting a local accumulation process of organic matter in the formation process of UCAMMs, such as irradiation of volatile ices in the external and cold regions of the protoplanetary disk, as proposed for the formation of the N-rich organic matter in UCAMMs [18]. The O/Si atomic ratio in UCAMMs is variable, but the average value is a good match to the solar value. The O/Si measured in UCAMMs is generally dominated by the minerals embedded in its organic matter. This similarity in O/Si atomic ratios suggests that the UCAMM mineral component is representative of the composition of the inner solar nebula. Irradiation tracks observed in pyroxenes in one UCAMM (DC060443) [17], indeed supports an origin of these minerals from the inner solar nebula. UCAMMs thus contain materials formed in the inner regions of the solar system and transported outward, mixed with material likely formed in situ in the outer regions of the protoplanetary disk.

Published
2018

16. Ultracarbonaceous Antarctic micrometeorites (UCAMMs): clues for their origin

Author

Cecile Engrand, Charon, E., Duprat, J., Dartois, E., Leroux, H., Karim Benzerara, Le Guillou, C., Bernard, S., Swaraj, S., Belkhou, R., Delauche, L., Godard, M., Augé, B., Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Edifices Nanométriques (LEDNA), Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M) (NIMBE UMR 3685), Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM AS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Univ. Paris-Sud, Institut d'astrophysique spatiale (IAS), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Unité Matériaux et Transformations - UMR 8207 (UMET), Centre National de la Recherche Scientifique (CNRS)-Université de Lille-Ecole Nationale Supérieure de Chimie de Lille (ENSCL)-Institut National de la Recherche Agronomique (INRA), Institut de minéralogie et de physique des milieux condensés (IMPMC), Université Pierre et Marie Curie - Paris 6 (UPMC)-IPG PARIS-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de géologie de l'ENS (LGE), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris, École normale supérieure - Paris (ENS Paris)-École normale supérieure - Paris (ENS Paris), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), Institut National de la Recherche Agronomique (INRA)-Ecole Nationale Supérieure de Chimie de Lille (ENSCL)-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de géologie de l'ENS (LGENS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Université Paris-Saclay-Univ. Paris-Sud-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Chimie du CNRS (INC)-Institut National de la Recherche Agronomique (INRA)-Centre National de la Recherche Scientifique (CNRS)-Université de Lille-Ecole Nationale Supérieure de Chimie de Lille (ENSCL), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS Paris), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
[SDU]Sciences of the Universe [physics], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2018

17. ABSTRACTS FROM THE 2019 ANNUAL MEETING OF THE SOCIETY FOR NORTHWESTERN VERTEBRATE BIOLOGY, HELD JOINTLY WITH THE WASHINGTON CHAPTER OF THE WILDLIFE SOCIETY, AND IN ASSOCIATION WITH NORTHWEST PARTNERS IN AMPHIBIAN AND REPTILE CONSERVATION, AT GREAT WOLF LODGE, GRAND MOUND, WASHINGTON, 25 FEBRUARY–1 M

Author

Angliss, Robyn P, primary, Ferguson, Megan C, additional, Appel, Cara L, additional, Brown, Jeremy, additional, Bortot, Claire, additional, Bean, William T, additional, Moriarty, Katie M, additional, Matthews, Sean M, additional, Green, David S, additional, Anderson, Stacy, additional, King, Evan, additional, Yaeger, J Scott, additional, Arismendi, Ivan, additional, Gregory, Stan, additional, Wildman, Randy, additional, Ashkenas, Linda, additional, Anderson, David, additional, Shuster, Laurie, additional, Evenson, Joseph R, additional, Huggins, Jessica L, additional, Calambokidis, John, additional, Ashton, Don, additional, Mcbain, Scott, additional, Railsback, Steve, additional, Bury, R. Bruce, additional, Bury, Gwen W., additional, Baker, C. Scott, additional, Sremba, Angie, additional, Pallin, Logan, additional, Atkinson, Shannon, additional, Rogan, Andy, additional, Kerr, Iain, additional, Bettaso, Jamie B., additional, Garwood, Justin M., additional, Bourque, Ryan M., additional, West, Christopher J., additional, Bingham, Daniel M, additional, Sepulveda, Adam, additional, Painter, Sally, additional, Bredeweg, Evan M., additional, Garcia, Tiffany S., additional, Morzillo, Anita T., additional, Schumaker, Nathan, additional, Buchanan, Joseph B., additional, Ashton, Don T., additional, Bettaso, James, additional, Germano, David J., additional, Slavens, Frank, additional, Slavens, Kate, additional, Bury, Gwendolynn W., additional, Ilharreguy, Arianna, additional, Flynn, Kiirsten, additional, Steiger, Gretchen, additional, Dobson, Elana, additional, Malleson, Mark, additional, Gisborne, Brian, additional, Berta, Susan, additional, Perez, Alie, additional, Camp, Meghan, additional, Shipley, Lisa A., additional, Varner, Johanna, additional, Chestnut, Tara, additional, Connors, Patrice K., additional, Light, Jessica E., additional, Tanis, Brian P., additional, Drew, Joshua A., additional, Anderson, Chris N., additional, Perry, Anali M., additional, Henning, Charon E., additional, Casillas, Mary, additional, Hinde, Katie, additional, Clair, C. Toby St., additional, Routledge, Kyle, additional, Palmer, Charlie, additional, Martinez-Nunez, Felix, additional, Cousins, Christopher, additional, Garcia, Tiffany, additional, Bredeweg, Evan, additional, Levi, Taal, additional, Allen, Jennifer, additional, Dodds, Jeanne, additional, Ernest, Kristina, additional, Escajeda, Erica, additional, Stafford, Kate, additional, Woodgate, Rebecca, additional, Laidre, Kristin, additional, Froschauer, Ann, additional, Hogan, Bronwyn, additional, Dickerson, Kimberly, additional, Smith-Castro, Jennifer, additional, Reichard, Jonathan, additional, Coleman, Jeremy, additional, Goerz, James, additional, Oyster, Jared, additional, Harris, Rich, additional, Kroll, AJ, additional, Reynolds, Claudine, additional, Johnson, Josh, additional, Shaw, David, additional, Goldberg, Caren S., additional, Pope, Karen, additional, Nelson, Nicolette, additional, Piovia-Scott, Jonah, additional, Hale, Jessica R., additional, Laidre, Kristin L., additional, Tinker, M. Tim, additional, Jameson, Ronald J., additional, Jeffries, Steven J., additional, Larson, Shawn E., additional, Bodkin, James L., additional, Haman, Katherine, additional, Hallock, Lisa, additional, Kalisz, Lameace, additional, Keren, Ilai, additional, Harris, Jeff, additional, Happe, Patti, additional, Hauck, Laura, additional, Penaluna, Brooke, additional, Cronn, Richard, additional, Weitemier, Kevin, additional, Homyack, Jessica A., additional, Hane, Matt, additional, Beech, Storm, additional, Rochelle, Michael J., additional, Hossack, Blake, additional, Honeycutt, Ken, additional, Mccaffery, Rebecca, additional, Russell, Robin, additional, Hull, Iver T., additional, Berry, Stephanie L., additional, Loggers, Chris, additional, Johnson, Timothy R., additional, Jeffries, Steven, additional, Lambourn, Dyanna, additional, Oliver, Josh, additional, Delong, Robert, additional, Melin, Sharon, additional, Gearin, Pat, additional, Orr, Tony, additional, Laake, Jeff, additional, Jones, Katie, additional, Kalisz, Glen P., additional, Mcallister, Kelly, additional, Kaufman, Victoria, additional, Wilson, Matthew, additional, Blewett, Tina, additional, King, Travis, additional, Thornton, Daniel, additional, Kozma, Jeffrey M., additional, Kroll, Andrew J., additional, Thornton, Jamie, additional, Lambourn, Dyanna. M., additional, Jeffries, Steve. J., additional, D'Agnese, Erin, additional, Smith, Woutrina, additional, Wilkinson, Kristin, additional, Huggins, Jessica, additional, Rice, James, additional, Duffield, Deborah, additional, Grigg, Michael, additional, Raverty, Stephen A., additional, Larson, Shawn, additional, Leppin, Mark, additional, Bury, R. B., additional, Lewis, Jeffrey C., additional, Ransom, Jason, additional, Werntz, David, additional, Mangan, Anna O., additional, Vogeler, Jody C., additional, Breckheimer, Ian K., additional, King, Wendy M., additional, Bagnall, Keith E., additional, Dugger, Katie M., additional, Matsuda, Brent M., additional, Andrusiak, Lorraine, additional, Clement, Erin, additional, Govindarajulu, Purnima, additional, Bell, Katie, additional, Jenkins, Kurt, additional, Sager-Fradkin, Kim, additional, Mcintyre, Thomas, additional, Shipley, Lisa, additional, Nerkowski, Stacey A., additional, Rachlow, Janet L., additional, Waits, Lisette P., additional, Demay, Stephanie M., additional, Gallie, Jon A., additional, Hohenlohe, Paul A., additional, Adams, Jennifer R., additional, Noren, Dawn P., additional, Raverty, Stephen, additional, Gaydos, Joseph K., additional, Leger, Judy A. ST., additional, Ylitalo, Gina M., additional, Nyman, Stephen, additional, Olson, Deanna H., additional, Ares, Adrian, additional, Puettmann, Klaus J., additional, Parker, Michael S., additional, Parsons, Kim M., additional, Pilliod, David S., additional, Hausner, Mark B., additional, Scherer, Rick D., additional, Mellison, Chad, additional, Reynolds, Nathaniel D., additional, White, Erik, additional, Bergh, Stefanie, additional, Holman, Eric, additional, Stephens, Nicholle, additional, Wainwright, James M., additional, Romansic, John, additional, Gray, Matt, additional, Carter, Davis, additional, Miller, Deb, additional, Rodriguez, Roger, additional, Rodhouse, Thomas J., additional, Ormsbee, Pat, additional, Irvine, Kathryn, additional, Barnett, Jenny, additional, Reif, Sarah, additional, Rombough, Chris, additional, Trunk, Laura, additional, Sandilands, Doug, additional, Sipe, Hannah A., additional, Converse, Sarah J., additional, Stone, Suzanne A., additional, Breck, Stewart W., additional, Timberlake, Jesse, additional, Haswell, Peter M., additional, Najera, Fernando, additional, Bean, Brian S., additional, Thornhill, Daniel J., additional, Sytsma, Mira, additional, Prugh, Laura, additional, Gardner, Beth, additional, Lewis, Tania, additional, Thomas, Austen C., additional, Howard, Jesse, additional, Nguyen, Phong, additional, Seimon, Tracie A., additional, Tidwell, Kyle S., additional, Carrothers, Brett A., additional, Bayley, Kristen N., additional, Magill, Lindsay N., additional, Leeuw, Bjorn K. Van Der, additional, Trites, Andrew W., additional, Urbina, Jenny, additional, Schwalm, Donelle, additional, Valerio, Azzurra, additional, Valerio, Mariacristina, additional, Casadei, Luca, additional, Haegen, Matthew Vander, additional, Norman, Christi, additional, Bayard, Trina, additional, Warlick, Amanda, additional, Ward, Eric, additional, O'Neill, Sandra, additional, Hanson, Brad, additional, Ylitalo, Gina, additional, Weil, Katy, additional, Whiles, Logan, additional, Wilmoth, Jodi, additional, Wolf, Tlell, additional, Short, Jesse, additional, Bowerman, Jay, additional, Yarber, Christian, additional, Goldberg, Caren, additional, Pessier, Allan, additional, Brunner, Jesse, additional, and Zerbini, Alexandre N., additional

Published
2019
Full Text
View/download PDF

18. ABSTRACTS FROM THE 2019 ANNUAL MEETING OF THE SOCIETY FOR NORTHWESTERN VERTEBRATE BIOLOGY, HELD JOINTLY WITH THE WASHINGTON CHAPTER OF THE WILDLIFE SOCIETY, AND IN ASSOCIATION WITH NORTHWEST PARTNERS IN AMPHIBIAN AND REPTILE CONSERVATION, AT GREAT WOLF LODGE, GRAND MOUND, WASHINGTON, 25 FEBRUARY–1 M

Author

Robyn P Angliss, Megan C Ferguson, Cara L Appel, Jeremy Brown, Claire Bortot, William T Bean, Katie M Moriarty, Sean M Matthews, David S Green, Stacy Anderson, Evan King, J Scott Yaeger, Ivan Arismendi, Stan Gregory, Randy Wildman, Linda Ashkenas, David Anderson, Laurie Shuster, Joseph R Evenson, Jessica L Huggins, John Calambokidis, Don Ashton, Scott Mcbain, Steve Railsback, R. Bruce Bury, Gwen W. Bury, C. Scott Baker, Angie Sremba, Logan Pallin, Shannon Atkinson, Andy Rogan, Iain Kerr, Jamie B. Bettaso, Justin M. Garwood, Ryan M. Bourque, Christopher J. West, Daniel M Bingham, Adam Sepulveda, Sally Painter, Evan M. Bredeweg, Tiffany S. Garcia, Anita T. Morzillo, Nathan Schumaker, Joseph B. Buchanan, Don T. Ashton, James Bettaso, David J. Germano, Frank Slavens, Kate Slavens, Gwendolynn W. Bury, Arianna Ilharreguy, Kiirsten Flynn, Gretchen Steiger, Elana Dobson, Mark Malleson, Brian Gisborne, Susan Berta, Alie Perez, Meghan Camp, Lisa A. Shipley, Johanna Varner, Tara Chestnut, Patrice K. Connors, Jessica E. Light, Brian P. Tanis, Joshua A. Drew, Chris N. Anderson, Anali M. Perry, Charon E. Henning, Mary Casillas, Katie Hinde, C. Toby St. Clair, Kyle Routledge, Charlie Palmer, Felix Martinez-Nunez, Christopher Cousins, Tiffany Garcia, Evan Bredeweg, Taal Levi, Jennifer Allen, Jeanne Dodds, Kristina Ernest, Erica Escajeda, Kate Stafford, Rebecca Woodgate, Kristin Laidre, Ann Froschauer, Bronwyn Hogan, Kimberly Dickerson, Jennifer Smith-Castro, Jonathan Reichard, Jeremy Coleman, James Goerz, Jared Oyster, Rich Harris, AJ Kroll, Claudine Reynolds, Josh Johnson, David Shaw, Caren S. Goldberg, Karen Pope, Nicolette Nelson, Jonah Piovia-Scott, Jessica R. Hale, Kristin L. Laidre, M. Tim Tinker, Ronald J. Jameson, Steven J. Jeffries, Shawn E. Larson, James L. Bodkin, Katherine Haman, Lisa Hallock, Lameace Kalisz, Ilai Keren, Jeff Harris, Patti Happe, Laura Hauck, Brooke Penaluna, Richard Cronn, Kevin Weitemier, Jessica A. Homyack, Matt Hane, Storm Beech, Michael J. Rochelle, Blake Hossack, Ken Honeycutt, Rebecca Mccaffery, Robin Russell, Iver T. Hull, Stephanie L. Berry, Chris Loggers, Timothy R. Johnson, Steven Jeffries, Dyanna Lambourn, Josh Oliver, Robert Delong, Sharon Melin, Pat Gearin, Tony Orr, Jeff Laake, Katie Jones, Glen P. Kalisz, Kelly Mcallister, Victoria Kaufman, Matthew Wilson, Tina Blewett, Travis King, Daniel Thornton, Jeffrey M. Kozma, Andrew J. Kroll, Jamie Thornton, Dyanna. M. Lambourn, Steve. J. Jeffries, Erin D'Agnese, Woutrina Smith, Kristin Wilkinson, Jessica Huggins, James Rice, Deborah Duffield, Michael Grigg, Stephen A. Raverty, Shawn Larson, Mark Leppin, R. B. Bury, Jeffrey C. Lewis, Jason Ransom, David Werntz, Anna O. Mangan, Jody C. Vogeler, Ian K. Breckheimer, Wendy M. King, Keith E. Bagnall, Katie M. Dugger, Brent M. Matsuda, Lorraine Andrusiak, Erin Clement, Purnima Govindarajulu, Katie Bell, Kurt Jenkins, Kim Sager-Fradkin, Thomas Mcintyre, Lisa Shipley, Stacey A. Nerkowski, Janet L. Rachlow, Lisette P. Waits, Stephanie M. Demay, Jon A. Gallie, Paul A. Hohenlohe, Jennifer R. Adams, Dawn P. Noren, Stephen Raverty, Joseph K. Gaydos, Judy A. ST. Leger, Gina M. Ylitalo, Stephen Nyman, Deanna H. Olson, Adrian Ares, Klaus J. Puettmann, Michael S. Parker, Kim M. Parsons, David S. Pilliod, Mark B. Hausner, Rick D. Scherer, Chad Mellison, Nathaniel D. Reynolds, Erik White, Stefanie Bergh, Eric Holman, Nicholle Stephens, James M. Wainwright, John Romansic, Matt Gray, Davis Carter, Deb Miller, Roger Rodriguez, Thomas J. Rodhouse, Pat Ormsbee, Kathryn Irvine, Jenny Barnett, Sarah Reif, Chris Rombough, Laura Trunk, Doug Sandilands, Hannah A. Sipe, Sarah J. Converse, Suzanne A. Stone, Stewart W. Breck, Jesse Timberlake, Peter M. Haswell, Fernando Najera, Brian S. Bean, Daniel J. Thornhill, Mira Sytsma, Laura Prugh, Beth Gardner, Tania Lewis, Austen C. Thomas, Jesse Howard, Phong Nguyen, Tracie A. Seimon, Kyle S. Tidwell, Brett A. Carrothers, Kristen N. Bayley, Lindsay N. Magill, Bjorn K. Van Der Leeuw, Andrew W. Trites, Jenny Urbina, Donelle Schwalm, Azzurra Valerio, Mariacristina Valerio, Luca Casadei, Matthew Vander Haegen, Christi Norman, Trina Bayard, Amanda Warlick, Eric Ward, Sandra O'Neill, Brad Hanson, Gina Ylitalo, Katy Weil, Logan Whiles, Jodi Wilmoth, Tlell Wolf, Jesse Short, Jay Bowerman, Christian Yarber, Caren Goldberg, Allan Pessier, Jesse Brunner, and Alexandre N. Zerbini

Subjects
Amphibian, Geography, biology, biology.animal, Wildlife, General Earth and Planetary Sciences, Vertebrate Biology, Archaeology, General Environmental Science
Published
2019
Full Text
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20. A C-, N-, O-XANES/STXM and TEM Study of Organic Matter and Minerals in Ultracarbonaceous Antarctic Micrometeorites (UCAMMs)

Author

Charon, E., Engrand, C., Benzerara, K., Leroux, H., Swaraj, S., Belkhou, R., Duprat, J., Dartois, E., Marie Godard, Delauche, L., Unité Matériaux et Transformations - UMR 8207 (UMET), Institut de Chimie du CNRS (INC)-Institut National de la Recherche Agronomique (INRA)-Centre National de la Recherche Scientifique (CNRS)-Université de Lille-Ecole Nationale Supérieure de Chimie de Lille (ENSCL), and Institut National de la Recherche Agronomique (INRA)-Ecole Nationale Supérieure de Chimie de Lille (ENSCL)-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], [SDU.STU]Sciences of the Universe [physics]/Earth Sciences, [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph], [CHIM.MATE]Chemical Sciences/Material chemistry, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2017

22. Raman spectroscopic properties and Raman identification of CaS-MgS-MnS-FeS-Cr$_2$FeS$_4$ sulfides in meteorites and reduced sulfur-rich systems

Author

Avril, C., Malavergne, Valérie, Caracas, R., Zanda, B., Reynard, B., Charon, E., Bobocioiu, E., Brunet, F., Borensztajn, S., Pont, S., Tarrida, M., Guyot, F., Laboratoire Géomatériaux et Environnement (LGE), Université Paris-Est Marne-la-Vallée (UPEM), Institut de minéralogie et de physique des milieux condensés (IMPMC), and Université Pierre et Marie Curie - Paris 6 (UPMC)-IPG PARIS-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)

Subjects
ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2013

23. Pt, Au, Pd and Ru partitioning between mineral and silicate melts: The role of metal nanonuggets

Author

Malavergne, Valérie, Charon, E., Jones, J., Agranier, Arnaud, Campbell, A., Laboratoire Géomatériaux et Environnement (LGE), Université Paris-Est Marne-la-Vallée (UPEM), Domaines Océaniques (LDO), Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Observatoire des Sciences de l'Univers-Institut d'écologie et environnement-Centre National de la Recherche Scientifique (CNRS), and Lge, Admin

Subjects
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences, ComputingMilieux_MISCELLANEOUS
Abstract

Pt, Au, Pd, and Ru partition coefficients between olivine (or diopside) and silicate melts have been determined. In parallel, we will explain how metal nanonuggets appeared in our samples and how we will understand their formation.

Published
2012

24. Graphitization at low temperatures (<1600°C) in presence of iron - Planetological implications

Author

Charon, E., Rouzaud, J.N., Aléon, J., Laboratoire de géologie de l'ENS (LGENS), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris, École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), CSNSM AS, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
[PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], [SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP]
Published
2011

25. Contribution of carbon science to planetology: Example of graphite formation on differentiated asteroids

Author

Charon, E., Rouzaud, J.N., Aléon, J., Laboratoire de géologie de l'ENS (LGENS), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris, École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), CSNSM AS, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
[PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], [SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP]
Published
2011

26. Géochimie isotopique et nanostructures des carbones des achondrites primitives

Author

Charon, E., Aléon, J., Laboratoire de géologie de l'ENS (LGENS), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris, École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), CSNSM AS, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Hadrossek, Christine

Subjects
[PHYS.ASTR.EP] Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], [PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], [SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], [SDU.ASTR.EP] Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP]
Published
2010

27. Oxygen Isotopes in the Ultra-Refractory CAI Efremovka 101.1 and the Solar Nebula

Author

Aléon, J., Mckeegan, K. D., El Goresy, A., Charon, E., Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de géologie de l'ENS (LGENS), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris, École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS Paris), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)

Subjects
[PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], [SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2010

28. Graphisation in presence of iron : astronomical implications

Author

Charon, E., Rouzaud, J.N., Aléon, J., Ammar, M.-R., CSNSM AS, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de géologie de l'ENS (LGENS), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris, École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS Paris), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)

Subjects
[PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], [SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP]
Published
2010

29. L'histoire et la vie des carbones lors de la formation planétaire : le message des météorites

Author

Charon, E., Aléon, J., Rouzeaud, J.N., Laboratoire de géologie de l'ENS (LGENS), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris, École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), CSNSM AS, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
[PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], [SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP]
Published
2010

30. Combined MicroRaman and C- N- Isotopic Study of Disordered Carbons in Acapulcoites - Lodranites

Author

Charon, E., Aléon, J., Rouzaud, J. N., Laboratoire de géologie de l'ENS (LGENS), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris, École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Hadrossek, Christine

Subjects
[PHYS.ASTR.EP] Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], [PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], [SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], [SDU.ASTR.EP] Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP]
Published
2009

36. NANOSTRUCTURATION OF POLYAROMATIC ANALOGUES OF THE CARBONACEOUS DUST.

Author

Carpentier, Y., Féraud, G., Dartois, E., Brunetto, R., Charon, E., Cao, A.-T., d'Hendecourt, L., Bréchignac, Ph., Rouzaud, J.-N., and Pino, T.

Subjects
NANOSTRUCTURED materials, INFRARED absorption, ASTROPHYSICS, CIRCUMSTELLAR matter, INTERSTELLAR medium
Abstract

Carbonaceous cosmic dust is mainly observed through infrared spectroscopy either in absorption or in emission. Laboratory soot analogues of this interstellar or circumstellar dust were produced in fuel-rich, low-pressure, premixed and flat, flames. The particles were investigated by infrared absorption spectroscopy in the 2-15 µm spectral region. The details of the spectral features shed some light on the structure of the material and enable the study of its life cycle. In particular, the 8 µm band position is tentatively attributed to defects at the edge or in the polyaromatic units of the materials, revealing these structural changes in astrophysical dust. [ABSTRACT FROM AUTHOR]

Published
2013
Full Text
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37. Nanostructuration of carbonaceous dust as seen through the positions of the 6.2 and 7.7 μm AIBs.

Author

Carpeptier, Y., Féraud, G., Dartois, E., Brunetto, R., Charon, E., Cao, A. -T., d'Hendecourt, L., Bréchignac, Ph., Rouzaud, J. -N., and Pino, T.

Subjects
CARBONACEOUS chondrites (Meteorites), COSMIC dust, INFRARED absorption, INFRARED spectroscopy, SOOT analysis, AROMATIC compounds
Abstract

Context. Carbonaceous cosmic dust is observed through infrared spectroscopy either in absorption or in emission. The details of the spectral features are believed to shed some light on its structure and finally enable the study of its life cycle. Aims. The goal is to combine several analytical tools in order to decipher the intimate nanostructure of some soot samples. Such materials provide interesting laboratory analogues of cosmic dust. In particular, spectroscopic and structural characteristics that help to describe the polyaromatic units embedded into the soot, including their size, morphology, and organisation are explored. Methods. Laboratory analogues of the carbonaceous interstellar and circumstellar dust were produced in fuel-rich low-pressure, premixed and flat flames. The soot particles were investigated by infrared absorption spectroscopy in the 2-15 μm spectral region. Raman spectroscopic measurements and high-resolution transmission electron microscopy were performed, which offered complementary information to better delineate the intimate structure of the analogues. Results. These laboratory analogues appeared to be mainly composed of sp2 carbon, with a low sp3 carbon content. A cross relation between the positions of the aromatic C=C bands at about 6.2 micron and the band at about 8 micron is shown to trace differences in shapes and structures of the polyaromatic units in the soot. Such effects are due to the defects of the polyaromatic structures in the form of non-hexagonal rings and/or aliphatic bridges. The role of these defects is thus observed through the 6.2 and 7.7 μm aromatic infrared band positions, and a distinction between carriers composed of curved aromatic sheets and more planar ones can be inferred. Based on these nanostructural differences, a scenario of nanograin growth and evolution is proposed. [ABSTRACT FROM AUTHOR]

Published
2012
Full Text
View/download PDF

38. Nanostructuration of carbonaceous dust as seen through the positions of the 6.2 and 7.7 μm AIBs.

Author

Carpentier, Y., Féraud, G., Dartois, E., Brunetto, R., Charon, E., Cao, A.-T., D'Hendecourt, L., Bréchignac, Ph., Rouzaud, J.-N., and Pino, T.

Subjects
DUST, INFRARED spectroscopy, NANOSTRUCTURES, CARBON, SOOT
Abstract

Context. Carbonaceous cosmic dust is observed through infrared spectroscopy either in absorption or in emission. The details of the spectral features are believed to shed some light on its structure and finally enable the study of its life cycle. Aims. The goal is to combine several analytical tools in order to decipher the intimate nanostructure of some soot samples. Such materials provide interesting laboratory analogues of cosmic dust. In particular, spectroscopic and structural characteristics that help to describe the polyaromatic units embedded into the soot, including their size, morphology, and organisation are explored. Methods. Laboratory analogues of the carbonaceous interstellar and circumstellar dust were produced in fuel-rich low-pressure, premixed and flat flames. The soot particles were investigated by infrared absorption spectroscopy in the 2-15 μm spectral region. Raman spectroscopic measurements and high-resolution transmission electron microscopy were performed, which offered complementary information to better delineate the intimate structure of the analogues. Results. These laboratory analogues appeared to be mainly composed of sp2 carbon, with a low sp3 carbon content. A cross relation between the positions of the aromatic C=C bands at about 6.2 micron and the band at about 8 micron is shown to trace differences in shapes and structures of the polyaromatic units in the soot. Such effects are due to the defects of the polyaromatic structures in the form of non-hexagonal rings and/or aliphatic bridges. The role of these defects is thus observed through the 6.2 and 7.7 μm aromatic infrared band positions, and a distinction between carriers composed of curved aromatic sheets and more planar ones can be inferred. Based on these nanostructural differences, a scenario of nanograin growth and evolution is proposed. [ABSTRACT FROM AUTHOR]

Published
2012
Full Text
View/download PDF

40. Critical Role of the Acetylene Content and Fe/C Ratio on the Thickness and Density of Vertically Aligned Carbon Nanotubes Grown at Low Temperature by a One-Step Catalytic Chemical Vapor Deposition Process.

Author

Combrisson A, Charon E, Pinault M, Reynaud C, and Mayne-L'Hermite M

Abstract

The present work explores the role of the carbon source content and the Fe/C ratio on the synthesis of vertically aligned carbon nanotubes (VACNTs) by one-step aerosol-assisted CCVD operated at a medium temperature (615 °C) on aluminum substrates. The main objective was to overcome the limitations of VACNT growth, constituting a drawback for applications requiring thick VACNTs. By using acetylene as carbon feedstock and ferrocene as a catalyst precursor, we demonstrate that when acetylene content is reduced to 1.5 vol%, it is possible to grow VACNT carpets up to 700 µm thick while maintaining constant VACNT growth for a long duration (up to 160 min). The carbon conversion yield is significantly improved when the acetylene content reaches 1.5 vol%. The Al surface roughness also influences VACNT growth. An optimum Fe/C ratio of 0.8 wt.% coupled with a low acetylene content gives the highest growth rate (5.4 µm/min) ever reported for a thermal aerosol-assisted CCVD process operated at such a low temperature. The CNT number density can be controlled by varying the Fe/C ratio, enabling high density growth (e.g., 1.3 × 10 11 CNT/cm 2 ).

Published
2022
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41. A Novel Patient Recruitment Strategy: Patient Selection Directly from the Community through Linkage to Clinical Data.

Author

Zimmerman LP, Goel S, Sathar S, Gladfelter CE, Onate A, Kane LL, Sital S, Phua J, Davis P, Margellos-Anast H, Meltzer DO, Polonsky TS, Shah RC, Trick WE, Ahmad FS, and Kho AN

Subjects
Biomedical Research, Clinical Trials as Topic, Follow-Up Studies, Humans, Precision Medicine, Electronic Health Records, Patient Selection, Residence Characteristics
Abstract

Objective: This article presents and describes our methods in developing a novel strategy for recruitment of underrepresented, community-based participants, for pragmatic research studies leveraging routinely collected electronic health record (EHR) data., Methods: We designed a new approach for recruiting eligible patients from the community, while also leveraging affiliated health systems to extract clinical data for community participants. The strategy involves methods for data collection, linkage, and tracking. In this workflow, potential participants are identified in the community and surveyed regarding eligibility. These data are then encrypted and deidentified via a hashing algorithm for linkage of the community participant back to a record at a clinical site. The linkage allows for eligibility verification and automated follow-up. Longitudinal data are collected by querying the EHR data and surveying the community participant directly. We discuss this strategy within the context of two national research projects, a clinical trial and an observational cohort study., Conclusion: The community-based recruitment strategy is a novel, low-touch, clinical trial enrollment method to engage a diverse set of participants. Direct outreach to community participants, while utilizing EHR data for clinical information and follow-up, allows for efficient recruitment and follow-up strategies. This new strategy for recruitment links data reported from community participants to clinical data in the EHR and allows for eligibility verification and automated follow-up. The workflow has the potential to improve recruitment efficiency and engage traditionally underrepresented individuals in research., Competing Interests: Abel N. Kho and Satyender Goel hold equity in Health DataLink LLC, which provides privacy-preserving record linkage software., (Schattauer GmbH Stuttgart.)

Published
2018
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