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101 results on '"Devlin, Eamonn"'

11. LAPONITE® nanodisk-“decorated” Fe3O4 nanoparticles: a biocompatible nano-hybrid with ultrafast magnetic hyperthermia and MRI contrast agent ability

Author

Basina, Georgia, primary, Diamantopoulos, George, additional, Devlin, Eamonn, additional, Psycharis, Vassilis, additional, Alhassan, Saeed M., additional, Pissas, Michael, additional, Hadjipanayis, George, additional, Tomou, Aphrodite, additional, Bouras, Alexandros, additional, Hadjipanayis, Constantinos, additional, and Tzitzios, Vasileios, additional

Published
2022
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13. LAPONITE® nanodisk-"decorated" Fe3O4 nanoparticles: a biocompatible nano-hybrid with ultrafast magnetic hyperthermia and MRI contrast agent ability.

Author

Basina, Georgia, Diamantopoulos, George, Devlin, Eamonn, Psycharis, Vassilis, Alhassan, Saeed M., Pissas, Michael, Hadjipanayis, George, Tomou, Aphrodite, Bouras, Alexandros, Hadjipanayis, Constantinos, and Tzitzios, Vasileios

Abstract

Magnetic Fe3O4 nanoparticles "decorated" by LAPONITE® nanodisks have been materialized utilizing the Schikorr reaction following a facile approach and tested as mediators of heat for localized magnetic hyperthermia (MH) and as magnetic resonance imaging (MRI) agents. The synthetic protocol involves the interaction between two layered inorganic compounds, ferrous hydroxide, Fe(OH)2, and the synthetic smectite LAPONITE® clay Na0.7+[(Si8Mg5.5Li0.3)O20(OH)4]0.7−, towards the formation of superparamagnetic Fe3O4 nanoparticles, which are well decorated by the diamagnetic clay nanodisks. The latter imparts high negative ζ-potential values (up to −34.1 mV) to the particles, which provide stability against flocculation and precipitation, resulting in stable water dispersions. The obtained LAPONITE®-"decorated" Fe3O4 nanohybrids were characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), Mössbauer spectroscopy, dynamic light scattering (DLS) and vibrating sample magnetometry (VSM) at room temperature, revealing superior magnetic hyperthermia performance with specific absorption rate (SAR) values reaching 540 W gFe−1 (28 kA m−1, 150 kHz) for the hybrid material with a magnetic loading of 50 wt% Fe3O4/LAPONITE®. Toxicity studies were also performed with human glioblastoma (GBM) cells and human foreskin fibroblasts (HFF), which show negligible to no toxicity. Furthermore, T2-weighted MR imaging of rodent brain shows that the LAPONITE®-"decorated" Fe3O4 nanohybrids predominantly affected the transverse T2 relaxation time of tissue water, which resulted in a signal drop on the MRI T2-weighted imaging, allowing for imaging of the magnetic nanoparticles. [ABSTRACT FROM AUTHOR]

Published
2022
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16. One-Dimensional Looped Chain and Two-Dimensional Square Grid Coordination Polymers: Encapsulation of Bis(1,2,4-Triazole)-trans-cyclohexane into the Voids : One-Dimensional Looped Chain and Two-Dimensional Square Grid Coordination Polymers: Encapsulation of Bis(1,2,4-Triazole)-trans-cyclohexane into the Voids

Author

UCL - SST/IMCN/MOST - Molecules, Solids and Reactivity, Adarsh, Nayarassery N., Dîrtu, Marinela M., Guionneau, Philippe, Devlin, Eamonn, Sanakis, Yiannis, Howard, Judith A. K., Chattopadhyay, Basab, Garcia, Yann, UCL - SST/IMCN/MOST - Molecules, Solids and Reactivity, Adarsh, Nayarassery N., Dîrtu, Marinela M., Guionneau, Philippe, Devlin, Eamonn, Sanakis, Yiannis, Howard, Judith A. K., Chattopadhyay, Basab, and Garcia, Yann

Published
2019

20. Front Cover: One-Dimensional Looped Chain and Two-Dimensional Square Grid Coordination Polymers: Encapsulation of Bis(1,2,4-Triazole)-trans -cyclohexane into the Voids (Eur. J. Inorg. Chem. 5/2019)

Author

Adarsh, Nayarassery N., primary, Dîrtu, Marinela M., additional, Guionneau, Philippe, additional, Devlin, Eamonn, additional, Sanakis, Yiannis, additional, Howard, Judith A. K., additional, Chattopadhyay, Basab, additional, and Garcia, Yann, additional

Published
2019
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24. Crystal engineering of a series of complexes and coordination polymers based on pyrazole-carboxylic acid ligands”

Author

UCL - SST/IMCN/MOST - Molecules, Solids and Reactivity, Benaissa, Houria, Adarsh, N. N., Ferbinteanu, Marilena, Devlin, Eamonn, Sanakis, Yiannis, Garcia, Yann, 45th National Seminar on Crystallography (NSC 45), IIT(BHU), UCL - SST/IMCN/MOST - Molecules, Solids and Reactivity, Benaissa, Houria, Adarsh, N. N., Ferbinteanu, Marilena, Devlin, Eamonn, Sanakis, Yiannis, Garcia, Yann, and 45th National Seminar on Crystallography (NSC 45), IIT(BHU)

Published
2017

25. Magnetically modified single and turbostratic stacked graphenes from tris(2,2'-bipyridyl) iron(II) ion-exchanged graphite oxide

Author

Szabo, Tamas, Bakandritsos, Aristides, Tzitzios, Vassilis, Devlin, Eamonn, Petridis, Dimitris, and Dekany, Imre

Subjects
Ion exchange -- Analysis, Iron -- Chemical properties, Organometallic compounds -- Chemical properties, Organometallic compounds -- Structure, Graphite -- Structure, Graphite -- Chemical properties, Pyridine -- Chemical properties, Chemicals, plastics and rubber industries
Published
2008

26. Electronic transport and magnetic properties of the perovskites La0.8Sr0.2Co1−xFexO3; x≤0.3

Author

Homonnay Zoltán, Aoki Yoshitaka, Klencsár Zoltán, de Châtel F. Péter, De Subodh Kumar, Vad Kalman, Meszaros Sandor, Kuzmann Ernő, Konno Hidetaka, Hakl József, Simopoulos Athanassios, Németh Zoltán, Vértes Attila, and Devlin Eamonn

Subjects
Colossal magnetoresistance, Condensed matter physics, Magnetoresistance, Chemistry, Giant magnetoresistance, General Chemistry, Magnetic semiconductor, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, Condensed Matter Physics, Magnetic susceptibility, Magnetization, Ferromagnetism, Electrical resistivity and conductivity, Condensed Matter::Strongly Correlated Electrons, General Materials Science
Abstract

Transport and magnetic properties of LaCoO 3 -based compounds, doped with 20% Sr and 2.5, 5, 10, 15, 20 and 30% Fe, were investigated by means of magnetization, resistivity and magnetoresistance measurements as well as by 57 Fe Mossbauer spectroscopy. While the temperature dependence of the dc and ac magnetic susceptibilities reveals the presence of magnetic phase separation accompanied by spin-glass and cluster-glass behavior, the electrical resistivity and magnetoresistance characteristics indicate that the mesoscopic structure of the present compounds is rather well described as consisting of ferromagnetic, metallic grains embedded in an insulating matrix. The effect of the partial Co → Fe substitution on the bulk magnetic and transport properties, as well as on the local state of Co and Fe ions is discussed.

Published
2009
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29. Experimental and Theoretical Mössbauer Study of an Extended Family of [Fe8(μ4-O)4(μ-4-R-px)12X4] Clusters

Author

Zueva, Ekaterina M., Sameera, W. M. C., Piñero, Dalice M., Chakraborty, Indranil, Devlin, Eamonn, Baran, Peter, Lebruskova, Katarina, Sanakis, Yiannis, McGrady, John E., and Raptis, Raphael G.

Abstract

Six [Fe8(μ4-O)4(μ-4-R-pyrazolato)12X4] complexes containing an identical Fe8(μ4-O)4core have been structurally characterized and studied by Mössbauer spectroscopy. In each case, an inner μ4-O bridged FeIIIcubane core is surrounded by four trigonal bipyramidal iron centers, the two distinct sites occurring in a 1:1 ratio. The Mössbauer spectrum of each of the clusters consists of two quadrupole doublets, which, with one exception (X = NCS, R = H), overlap to give three absorption lines. The systematic variation of X and R causes significant changes in the Mössbauer spectra. A comparison with values for the same clusters computed using density functional theory allows us to establish an unequivocal assignment of these peaks in terms of a nested model for the overlapping doublets. The changes in Mössbauer parameters (both experimental and computed) for the 1-electron reduced species [Fe8(μ4-O)4(μ-4-Cl-pyrazolato)12Cl4]−are consistent with a redox event that is localized within the cubane core.

Published
2024
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32. Enrichment and oral bioaccessibility of selected trace elements in fly ash-derived magnetic components.

Author

Bourliva, Anna, Papadopoulou, Lambrini, Aidona, Elina, Simeonidis, Konstantinos, Vourlias, George, Devlin, Eamonn, and Sanakis, Yiannis

Subjects
FLY ash, MAGNETOSPHERE, MAGNETIC properties, TRACE elements, MOSSBAUER spectroscopy
Abstract

The mineralogy, morphology, and chemical composition of magnetic fractions separated from fly ashes (FAs) originating from Greek lignite-burning power plants was investigated. The oral bioaccessibility of potentially harmful elements (PHEs) from the fly ash magnetic fractions (FAMFs) was also assessed using in vitro gastrointestinal extraction (BARGE Unified Bioaccessibility Method, UBM). The FAMFs isolated were in the range 4.6-18.4%, and their mass specific magnetic susceptibility ranged from 1138 × 10 to 1682 × 10 m/kg. XRD analysis and Mossbauer spectroscopy indicated that the dominant iron species were Fe-rich aluminosilicate glass along with magnetite, hematite, and maghemite (in decreasing order). The raw FAs exhibited differences in their chemical composition, indicating the particularity of every lignite basin. The elemental contents of FAMFs presented trends with fly ash type; thus, the FAMFs of high-Ca FAs were enriched in siderophile (Cr, Co, Ni) and lithophile (Cs, Li, Rb) elements and those separated from low-Ca FAs were presented depleted in chalcophile elements. Based on UBM extraction tests, the PHEs were more bioaccessible from the non-magnetic components of the FAs compared to the magnetic ones; however, the bioaccessible fractions estimated for the FAMFs were exceeding 40 % in many cases. Arsenic was found to be significantly bioaccessible (median ~ 80 %) from FAMFs despite the lower As contents in the magnetic fraction. [ABSTRACT FROM AUTHOR]

Published
2017
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49. ChemInform Abstract: Facile Synthesis of Fe2O3Nanocrystals Without Fe(CO)5Precursor and One‐Pot Synthesis of Highly Fluorescent Fe2O3—CdSe Nanocomposites.

Author

Ang, Chung Yen, Giam, Louise, Chan, Zheng Ming, Lin, Alex W. H., Gu, Hongwei, Devlin, Eamonn, Papaefthymiou, Georgia C., Selvan, Subramanian Tamil, and Ying, Jackie Y.

Abstract

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Published
2009
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50. Structure and magnetic properties of Zn1−x In x Fe2O4 and ZnY x Fe2−x O4 nanoparticles prepared by coprecipitation

Author

Milanović, Marija, Moshopoulou, Evagelia G., Stamopoulos, Dimosthenis, Devlin, Eamonn, Giannakopoulos, Konstantinos P., Kontos, Athanassios G., Eleftheriadis, Kostas, Gini, Maria I., and Nikolić, Ljubica M.

Subjects
*ZINC ferrites, *PRECIPITATION (Chemistry), *INDIUM, *YTTRIUM, *NANOPARTICLE synthesis, *TRANSMISSION electron microscopy, *CRYSTAL structure, *MAGNETIC properties of metals
Abstract

Abstract: Zinc ferrites, ZnFe2O4 and zinc ferrite nanoparticles substituted with indium and yttrium, Zn1−x In x Fe2O4 and ZnY x Fe2−x O4 (0≤x≤0.3), were synthesized by co-precipitation method. We have investigated the effect of composition on the cation distribution in the spinel structure, and on the magnetic properties with a view to obtain magnetic ceramics with improved properties compared to their bulk counter parts. The results of X–ray diffraction (XRD) and transmission electron microscopy (TEM) confirmed the nanoscale dimensions and spinel structure of the samples. The estimated crystallite size lies within the range 4–10nm. Additional experiments had been conducted using a scanning mobility particle sizer spectrometer (SMPS) in order to measure the number size distribution of the nanoparticles. Mössbauer spectroscopy was used to investigate the cation distribution between the tetrahedral and octahedral sites and the formation of the partially inverse spinel. The study of the magnetic properties showed that the hysteresis loops do not saturate even in the presence of high magnetic fields, confirming the superparamagnetic single domain nature of the samples. The particle size and composition variations (e.g. addition of yttrium and indium) cause significant structural rearrangements which affect the magnetic behavior of these materials. [Copyright &y& Elsevier]

Published
2013
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