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739 results on '"Pirri, C."'

1. Structure of germanene/Al(111): a two-layers surface alloy

Author

Zhang, K., Sciacca, D., Hanf, M. -C., Bernard, R., Borensztein, Yves, Resta, A., Garreau, Y., Vlad, A., Coati, A., Lefebvre, I., Derivaz, M., Pirri, C., Sonnet, P., Stephan, R., and Prévot, G.

Subjects
Condensed Matter - Materials Science, Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

Unlike silicene, for which the demonstration of its existence has been done through numerous independent studies, the possibility of growing epitaxial germanene remains highly controversial. It has been recently shown by scanning tunneling microscopy that the (3 x 3) surface reconstruction formed upon Ge deposition on Al(111) presents a honeycomb structure, and it was assigned to a pure germanene monolayer. Using quantitative measurements by surface X-ray diffraction compared to density functional theory calculations, we demonstrate that this Ge/Al(111) (3 x 3) reconstruction corresponds, in fact, to a mixed Ge--Al honeycomb layer on top of an alloyed interfacial layer. The model of a germanene monolayer on top of the Al(111) surface can be completely excluded.

Published
2021

2. Resolving the structure of the striped Ge layer on Ag(111): Ag$_2$Ge surface alloy with alternate fcc and hcp domains

Author

Zhang, K., Sciacca, D., Coati, A., Bernard, R., Borensztein, Yves, Diener, P., Grandidier, B., Lefebvre, I., Derivaz, M., Pirri, C., and Prévot, Geoffroy

Subjects
Condensed Matter - Materials Science
Abstract

Two-dimensional (2D) honeycomb lattices beyond graphene, such as germanene, promise new physical properties such as quantum spin Hall effect. While there have been many claims of growth of germanene, the lack of precise structural characterization of the epitaxial layers synthesized hinders further research. The striped layer formed by Ge deposition on Ag(111) has been recently ascribed as a stretched germanene layer. Using surface X-ray diffraction and density functional theory calculations, we demonstrate that it corresponds in fact to a Ag$_2$Ge surface alloy with an atomic density 6.45% higher than the Ag(111) atomic density. The overall structure is formed by stripes associated with a face-centered cubic top-layer alignment, alternating with stripes associated with an hexagonal-close-packed top-layer alignment, in great analogy with the ($22\times\sqrt3$) Au(111) reconstruction.

Published
2021
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3. Hyperbolic Metamaterials via Hierarchical Block Copolymer Nanostructures

Author

Murataj, I., Channab, M., Cara, E., Pirri, C. F., Boarino, L., Angelini, A., and Lupi, F. Ferrarese

Subjects
Condensed Matter - Materials Science, Physics - Optics
Abstract

Hyperbolic metamaterials (HMMs) offer unconventional properties in the field of optics, enabling opportunities for confinement and propagation of light at the nanoscale. In-plane orientation of the optical axis, in the direction coinciding with the anisotropy of the HMMs, is desirable for a variety of novel applications in nanophotonics and imaging. Here, a method for creating localized HMMs with in-plane optical axis, based on block copolymer (BCP) blend instability, is introduced. The dewetting of BCP thin film over topographically defined substrates generates droplets composed of highly ordered lamellar nanostructures in hierarchical configuration. The hierarchical nanostructures represent a valuable platform for the subsequent pattern transfer into a Au/air HMM, exhibiting hyperbolic behavior in a broad wavelength range in the visible spectrum. A computed Purcell factor as high as 32 at 580 nm supports the strong reduction in the fluorescence lifetime of defects in nanodiamonds placed on top of the HMM., Comment: This is the pre-peer reviewed version of the following article: I. Murataj et al. Adv. Optical Mater. 2021, 2001933, which has been published in final form at https://doi.org/10.1002/adom.202001933. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions

Published
2021
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5. The Technique of Intradiscal Injection: A Narrative Review

Author

Migliore A, Sorbino A, Bacciu S, Bellelli A, Frediani B, Tormenta S, Pirri C, and Foti C

Subjects
discopathy, guidance, injection, intradiscal injections, low back pain, safety., Therapeutics. Pharmacology, RM1-950
Abstract

Alberto Migliore,1 Andrea Sorbino,2 Serenella Bacciu,2 Alberto Bellelli,3 Bruno Frediani,4 Sandro Tormenta,3 Carmelo Pirri,2 Calogero Foti2 1Rheumatology, S. Pietro Fatebenefratelli Hospital, Rome, Italy; 2Physical and Rehabilitation Medicine, University of Rome “Tor Vergata”, Rome, Italy; 3Radiology, Fatebenefratelli S. Pietro Hospital, Rome, Italy; 4Research Centre of Systemic Autoinflammatory Diseases Behcet Disease Clinic and Rheumatology-Ophthalmology Collaborative Uveitis Centre Department of Medical Sciences Surgery and Neurosciences, University of Siena, Siena, ItalyCorrespondence: Andrea Sorbino Email a.sorbino@quaderni.bizBackground: Low back pain (LBP) is one of the most common spine diseases and represents the most frequent cause of absence from work in developed countries. Approximately 40% of chronic LBP is related to discogenic origin. The goal of the study is producing a review of literature to describe analytically the techniques of intradiscal injections.Methods: PubMed database was searched for clinical studies with the different key terms: “intradiscal”, “injection”, “steroid” “procedures”, “techniques”, “CT”, “MRI”, “fluoroscopy”, “fluoroscopic”, “guidance”, “ozone”, “ultrasound”, “images”. Only studies written in English, French, or Italian in which the intradiscal injection represents the main procedure for the low back discopathy treatment on humans were considered. We excluded the articles that do not mention this procedure; those which indicated that the intradiscal injection had happened accidentally during other treatments; those reporting the patient’s pain was determined by other causes than the discopathy (facet joint syndrome, tumor, spondylodiscitis).Results: Thirty-one articles dated from 1969 to 2018 met the criteria. The examined population was 6843 subjects, 52.3% male and 47.7% female, with a mean age of 45.9± 10.1 years. The techniques are highly variable in terms of procedure: different operators, needle guidance, injection sites, drugs, tilt angle of the needle).Conclusion: The efficacy and the safety of the intradiscal procedures are not easily comparable due to different types of studies and their limited number. Further studies are needed to standardize the intradiscal injection technique/procedure to improve safety, repeatability and effectiveness, and last but not least to reduce peri- and postoperative care and health-care costs.Keywords: discopathy, guidance, injection, intradiscal injections, low back pain, safety

Published
2020

7. A Facile and Green Microwave-Assisted Strategy to Induce Surface Properties on Complex-Shape Polymeric 3D Printed Structures

Author

Gonzalez, G., Arévalo, María, Chiappone, A., Martínez Campos, Enrique, Pirri, C. F., Roppolo, I., Bosch, Paula, Gonzalez, G., Arévalo, María, Chiappone, A., Martínez Campos, Enrique, Pirri, C. F., Roppolo, I., and Bosch, Paula

Abstract

Light- induced polymeric 3D printing is becoming a well-established fabrication method, showing manifold advantages such as control of the local chemistry of the manufactured devices. It can be considered a green technology, since the parts are produced when needed and with minimum amount of materials. In this work 3D printing is combined with another green technology, microwave-assisted reaction, to fabricate objects of complex geometry with controllable surface properties, exploiting the presence of remaining functional groups on the surface of 3D printed specimens. In this context, surface functionalization with different amines is studied, optimizing formulations, reaction times, and avoiding surface deterioration. Then, two different applications are investigated. MW-functionalized filter-type structures have been tested against Staphylococcus aureus bacteria, showing high bactericidal activity on the surface along all areas of the complex-shaped structure. Second, a fluidic chip composed of three separated channels is 3D printed, filled with different amine-reactive dyes (dansyl and eosine derivatives), and made to react simultaneously. Complete and independent functionalization of the surface of the three channels is achieved only after 2 min of irradiation. This study demonstrates that light induced 3D printing and microwave-induced chemistry can be used together effectively, and used to produce functional devices.

Published
2023

13. High-performance novel asymmetric MXene@CNT//N-doped CNT flexible hybrid device with large working voltage for energy storage

Author

Dangbegnon, J., Garino, N., Angelozzi, M., Laurenti, M., Seller, F., Serrapede, M., Zaccagnini, P., Moras, P., Cocuzza, M., Ouisse, T., Pazniak, H., Gonzalez-Julian, J., Sheverdyaeva, P. M., Di Vito, A., Pedico, A., Pirri, C. F., and Lamberti, A.

Subjects
CNT yarns, Hybrid asymmetric flexible device, Energy storage, PVDF membrane, Renewable Energy, Sustainability and the Environment, Energy Engineering and Power Technology, Electrical and Electronic Engineering
Published
2023
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15. Combined surface x-ray diffraction and density functional theory study of the germanene/Al(111)- (7×7)R19.1∘ structure

Author

Zhang, K., primary, Hanf, M.-C., additional, Sciacca, D., additional, Bernard, R., additional, Borensztein, Y., additional, Resta, A., additional, Garreau, Y., additional, Vlad, A., additional, Coati, A., additional, Lefebvre, I., additional, Derivaz, M., additional, Pirri, C., additional, Sonnet, P., additional, Stephan, R., additional, and Prévot, G., additional

Published
2022
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17. Microwave-assisted methacrylation of chitosan for 3D printable hydrogels in tissue engineering

Author

Zanon, M., Chiappone, A., Garino, N., Canta, M., Frascella, F., Hakkarainen, Minna, Pirri, C. F., Sangermano, M., Zanon, M., Chiappone, A., Garino, N., Canta, M., Frascella, F., Hakkarainen, Minna, Pirri, C. F., and Sangermano, M.

Abstract

Light processable natural polymers are highly attractive for 3D printing of biomedical hydrogels with defined geometries and sizes. However, functionalization with photo-curable groups, such as methacrylate or acrylate groups, is required. Here, we investigated a microwave-assisted process for methacrylation of chitosan to replace conventional methacrylation processes that can be time consuming and tedious. The microwave-assisted methacrylation reaction was optimized by varying the synthesis parameters such as the molar ratio of chitosan to the methacrylic agent, the launch and reaction times and process temperature. The optimized process was fast and efficient and allowed tuning of the degree of substitution and thereby the final hydrogel properties. The successful methacrylation and degree of substitution were verified by 1H NMR and attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR). The influence of the degree of methacrylation on photo-rheology, mechanical stiffness, swelling degree and gel content was evaluated. Furthermore, favourable 3D printability, enzymatic degradability, biocompatibility, cell migration and proliferation were demonstrated giving promise for further applications in tissue engineering., QC 20230615

Published
2022
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22. Combined surface x-ray diffraction and density functional theory study of the germanene/Al(111)-(7×7) R19.1° structure

Author

Zhang, K., Hanf, M.C., Sciacca, D., Bernard, Romain, Borensztein, Yves, Resta, A., Garreau, Y., Vlad, A., Coati, A., Lefebvre, Isabelle, Derivaz, M., Pirri, C., Sonnet, P., Stephan, R., Prévot, G., Institut des Nanosciences de Paris (INSP), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut de Science des Matériaux de Mulhouse (IS2M), Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), Physique - IEMN (PHYSIQUE - IEMN), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Laboratoire Matériaux et Phénomènes Quantiques (MPQ (UMR_7162)), Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), This study is financially supported the French National Research Agency (Germanene Project No. ANR-17-CE09-0021-03). K.Z. is supported by the Chinese Scholarship Council (CSC Contract No. 201808070070). The authors would like to acknowledge the High Performance Computing Center of the University of Strasbourg for supporting this work by providing scientific support and access to computing resources. Part of the computing resources were funded by the Equipex Equip@Meso project (Programme Investissements d’Avenir) and the CPER Alsacalcul/Big Data., ANR-17-CE09-0021,GERMANENE,Croissance de germanene sur substrats à bande interdite(2017), and ANR-10-EQPX-0029,EQUIP@MESO,Equipement d'excellence de calcul intensif de Mesocentres coordonnés - Tremplin vers le calcul petaflopique et l'exascale(2010)

Subjects
[PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics
Abstract

International audience; Several studies have reported the possible growth of germanene on various metal surfaces. However, the exact structure of the layers formed upon evaporation at or above room temperature remains controversial. In particular, the layers obtained after Ge deposition on Al(111) have been either considered as honeycomb organization of Ge atoms on top of a nonreconstructed substrate, or as alloyed layers. Using quantitative measurements by surface x-ray diffraction compared to density functional theory calculations, we show that the (√7×√7)R±19.1∘ reconstruction obtained after room temperature deposition is a mixed Ge-Al honeycomb layer, on top of an Al(111) plane, and not a pure germanene layer.

Published
2022
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25. Resolving the structure of the striped Ge layer on Ag ( 111 ) : Ag 2 Ge surface alloy with alternate fcc and hcp domains

Author

Zhang, K., Sciacca, D., Coati, A., Bernard, R., Borensztein, Yves, Diener, P., Grandidier, B., Lefebvre, Isabelle, Derivaz, M., Pirri, C., Prévot, Geoffroy, Physico-chimie et dynamique des surfaces (INSP-E6), Institut des Nanosciences de Paris (INSP), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Physique - IEMN (PHYSIQUE - IEMN), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Institut des Biomolécules Max Mousseron [Pôle Chimie Balard] (IBMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institut de Science des Matériaux de Mulhouse (IS2M), Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Chinese Scholarship Council (CSC Contract No. 201808070070), This study is financially supported by the French National Research Agency (Germanene Project No. ANR-17-CE09-0021-03), Renatech Network, PCMP PCP, ANR-17-CE09-0021,GERMANENE,Croissance de germanene sur substrats à bande interdite(2017), Borensztein, Yves, Croissance de germanene sur substrats à bande interdite - - GERMANENE2017 - ANR-17-CE09-0021 - AAPG2017 - VALID, Centre National de la Recherche Scientifique (CNRS)-Matériaux et nanosciences d'Alsace (FMNGE), Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, and Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)

Subjects
[PHYS.COND.CM-GEN] Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], [PHYS.COND.CM-MS] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]
Abstract

International audience; Two-dimensional (2D) honeycomb lattices beyond graphene, such as germanene, promise new physical properties such as quantum spin Hall effect. While there have been many claims of growth of germanene, the lack of precise structural characterization of the epitaxial layers synthesized hinders further research. The striped layer formed by Ge deposition on Ag(111) has been recently ascribed as a stretched germanene layer. Using surface X-ray diffraction and density functional theory calculations, we demonstrate that it corresponds in fact to a Ag2Ge surface alloy with an atomic density 6.45% higher than the Ag(111) atomic density. The overall structure is formed by stripes associated with a face-centered cubic top-layer alignment, alternating with stripes associated with an hexagonal-close-packed top-layer alignment, in great analogy with the (22×√3) Au(111) reconstruction.

Published
2021
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26. Light-based 3D printing of functional polydimethylsiloxane- based microfluidic chips

Author

Pirri C. Fabrizio, Kurt Dietliker, Gustavo A. Gonzalez, Annalisa Chiappone, and Ignazio Roppolo

Subjects
chemistry.chemical_compound, Photopolymer, Silicone, Materials science, Polydimethylsiloxane, chemistry, business.industry, Microfluidics, 3D printing, Surface modification, Nanotechnology, General Medicine, business
Abstract

The objective of the work is to fabricate and functionalize 3D printed PDMS-based microfluidic chips through digital light processing DLP-3D printing.

Published
2021
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29. Structure of Germanene/Al(111): A Two-Layer Surface Alloy

Author

Zhang, K., primary, Sciacca, D., additional, Hanf, M.-C., additional, Bernard, R., additional, Borensztein, Y., additional, Resta, A., additional, Garreau, Y., additional, Vlad, A., additional, Coati, A., additional, Lefebvre, I., additional, Derivaz, M., additional, Pirri, C., additional, Sonnet, P., additional, Stephan, R., additional, and Prévot, G., additional

Published
2021
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38. Aerogels for energy and environmental applications

Author

Fontanazza, G., Quaglio, M., Pirri, C. F., and Verga, F.

Subjects
energy production, air cleaning, energy storage, water remediation, Aerogel, air cleaning, water remediation, energy production, energy storage, Aerogel
Published
2020

41. Stable and Reversible Lithium Storage Properties of LiTiOx Nanotubes for Electrochemical Recovery from Aqueous Solutions.

Author

Baudino, Luisa, Zaccagnini, Pietro, Garino, Nadia, Serrapede, Mara, Laurenti, Marco, Pedico, Alessandro, Pirri, C. Fabrizio, and Lamberti, Andrea

Subjects
TITANIUM oxide nanotubes, NANOTUBES, AQUEOUS solutions, LITHIUM titanate, LITHIUM, STRUCTURAL stability
Abstract

In the present work, an easy and scalable method to prepare lithium titanium oxide nanotubes with stable and reversible lithium storage properties is reported. This material could be an excellent candidate for lithium recovery from aqueous solutions or have a direct application as Li‐ion batteries electrodes in a circular economy perspective. Vertically oriented anatase nanotubes are grown by anodic oxidation in an ethylene glycol‐based electrolyte. Then, the nanotubes are hydrothermally converted into a mixed lithium titanate. Morphological and crystallographic characterizations confirm the successful shape‐preserving conversion after which the nanotubes are subjected to electrochemical cycling. XRD and XPS analyses confirm a significant lithium uptake after cycling, and its recovery is investigated by means of an acidic treatment. While allowing for an almost complete recovery of the lithium integrated in their structure, the nanotubes also showed excellent morphological and structural stability proving to be excellent candidates for lithium recovery purposes. [ABSTRACT FROM AUTHOR]

Published
2022
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44. Tailored and Guided Dewetting of Block Copolymer/Homopolymer Blends

Author

Ferrarese Lupi, F., primary, Murataj, I., additional, Celegato, F., additional, Angelini, A., additional, Frascella, F., additional, Chiarcos, R., additional, Antonioli, D., additional, Gianotti, V., additional, Tiberto, P., additional, Pirri, C. F., additional, Boarino, L., additional, and Laus, M., additional

Published
2020
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