5 results on '"Lucien, Saviot"'
Search Results
2. Phonons in Hybrid Lamellar Supercrystals
- Author
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Nicola Pinna, Gianvito Caputo, and Lucien Saviot
- Subjects
Materials science ,chemistry.chemical_element ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,Colloid ,symbols.namesake ,chemistry.chemical_compound ,Optics ,Phase (matter) ,Lamellar structure ,Physical and Theoretical Chemistry ,business.industry ,Yttrium ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Characterization (materials science) ,General Energy ,chemistry ,Chemical engineering ,Benzyl alcohol ,symbols ,0210 nano-technology ,Raman spectroscopy ,business ,Raman scattering - Abstract
Phonons in hybrid lamellar supercrystals are investigated by Raman scattering. Special attention is paid to low-frequency vibrations as a mean to shed some light onto the structure at the nanometer scale. In particular, little is known about the structure of the organic capping agents in supercrystals made of colloidal nanopoarticles. This is due to the fact that characterization tools such as electron microscopy and X-ray diffraction are mostly sensitive to the inorganic phase due to its larger electronic density. Raman scattering does not suffer from this limitation. In this class of materials, synthesized following the “benzyl alcohol route”, the inorganic layers are kept together by π–π conjugated interactions. Low-frequency Raman spectra have been measured for yttrium and neodymium oxide-based lamellar organic–inorganic supercrystals synthesized with three benzyl alcohol derivatives. The spectra strongly depend on the nature of both the inorganic and organic phase despite the resulting lamellar struc...
- Published
- 2017
3. Crystallinity Dependence of the Plasmon Resonant Raman Scattering by Anisotropic Gold Nanocrystals
- Author
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Eugène Duval, Nicolas Goubet, Peng Yang, Marie-Paule Pileni, Sergey Sirotkin, Alain Mermet, Lucien Saviot, Hervé Portalès, Laboratoire des Matériaux Mésoscopiques et Nanométriques (LMMN), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Interdisciplinaire Carnot de Bourgogne (LICB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physico-Chimie des Matériaux Luminescents (LPCML), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon, Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Laboratoire des Matériaux Mésoscopiques et Nanométriques ( LMMN ), Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire Interdisciplinaire Carnot de Bourgogne ( LICB ), Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Physico-Chimie des Matériaux Luminescents ( LPCML ), Université Claude Bernard Lyon 1 ( UCBL ), and Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique ( CNRS )
- Subjects
Materials science ,Macromolecular Substances ,Surface Properties ,Molecular Conformation ,[ PHYS.COND.CM-MS ] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] ,Analytical chemistry ,General Physics and Astronomy ,02 engineering and technology ,Spectrum Analysis, Raman ,010402 general chemistry ,01 natural sciences ,Molecular physics ,symbols.namesake ,Crystallinity ,Computer Science::Systems and Control ,Condensed Matter::Superconductivity ,Materials Testing ,Physics::Atomic and Molecular Clusters ,Nanotechnology ,General Materials Science ,Particle Size ,Surface plasmon resonance ,Anisotropy ,Computer Science::Distributed, Parallel, and Cluster Computing ,Plasmon ,General Engineering ,Surface Plasmon Resonance ,021001 nanoscience & nanotechnology ,Nanostructures ,0104 chemical sciences ,Refractometry ,Nanocrystal ,Transmission electron microscopy ,[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] ,symbols ,Gold ,Crystallization ,0210 nano-technology ,Raman scattering ,Excitation - Abstract
International audience; Au nanocrystals (NCs) with different crystalline structures and related morphologies are unselectively synthesized using an organometallic route. The acoustic vibrations of these NCs are studied by plasmon mediated low-frequency Raman scattering (LFRS). A splitting of the quadrupolar vibration mode is pointed out in the LFRS spectrum. Comparison of the measured frequencies with calculations and careful examination of the NCs morphologies by transmission electron microscopy ascertain this splitting as being an effect of crystallinity. The excitation dependence of the LFRS spectra is interpreted by the shape-selection of the NCs via plasmon−vibration coupling. These results give new insights into the crystallinity influence on both the vibrations of the NCs and their coupling with plasmons and demonstrate the relevance of elastic anisotropy in monodomain NCs.
- Published
- 2010
4. Damping by Bulk and Shear Viscosity of Confined Acoustic Phonons for Nanostructures in Aqueous Solution
- Author
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Lucien Saviot, Caleb H. Netting, Daniel B. Murray, Laboratoire Interdisciplinaire Carnot de Bourgogne ( LICB ), Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS ), Mathematics, Statistics and Physics Unit ( MSP ), University of British Columbia ( UBC ), Laboratoire Interdisciplinaire Carnot de Bourgogne (LICB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Mathematics, Statistics and Physics Unit (MSP), and University of British Columbia (UBC)
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Materials science ,Aqueous solution ,Intrinsic viscosity ,Isotropy ,[ PHYS.COND.CM-MS ] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] ,02 engineering and technology ,Volume viscosity ,021001 nanoscience & nanotechnology ,01 natural sciences ,Viscoelasticity ,Surfaces, Coatings and Films ,Physics::Fluid Dynamics ,Viscosity ,Chemical physics ,0103 physical sciences ,[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] ,Materials Chemistry ,Compressibility ,Newtonian fluid ,Physical and Theoretical Chemistry ,010306 general physics ,0210 nano-technology - Abstract
International audience; A nanoparticle in aqueous solution is modeled as a homogeneous elastic isotropic continuum sphere in contact with an infinite viscous compressible Newtonian fluid. The frequencies and damping of the confined vibrational modes of the sphere are calculated for the material parameters of a CdSe nanoparticle in water and a poly(methyl methacrylate) nanosphere in water. Although the effects of viscosity are found to be negligible for macroscopic objects, for nanoscale objects, both the frequency and damping of the vibrational modes are significantly affected by the viscosity of the liquid. Furthermore, both shear viscosity and bulk viscosity play an important role. A model of the spherical satellite tobacco mosaic virus consisting of outer solid layers with a water core is also investigated, and the viscosity of the water core is found to significantly damp the free vibrational modes. The same approach can be applied for nonspherical geometries and also to viscoelastic nanoparticles.
- Published
- 2007
5. Correction to 'Nanovectorization of TRAIL with Single Wall Carbon Nanotubes Enhances Tumor Cell Killing'
- Author
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Florent Dufour, Olivier Micheau, Thibault Rattier, Marc Pudlo, Guillaume Herlem, Tijani Gharbi, Rémi Chassagnon, Fabien Picaud, Jeannine Lherminier, Al Batoul Zakaria, and Lucien Saviot
- Subjects
Receptor Aggregation ,Chemistry ,Mechanical Engineering ,Bioengineering ,General Chemistry ,Condensed Matter Physics ,Apoptosis ,Cell culture ,Cancer cell ,Cancer research ,Nanomedicine ,General Materials Science ,Tumor necrosis factor alpha ,Nanocarriers ,Receptor - Abstract
Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL or Apo2L) is a member of the tumor necrosis factor (TNF) superfamily. This type II transmembrane protein is able to bound specifically to cancer cell receptors (i.e., TRAIL-R1 (or DR4) and TRAIL-R2 (or DR5)) and to induce apoptosis without being toxic for healthy cells. Because membrane-bound TRAIL induces stronger receptor aggregation and apoptosis than soluble TRAIL, we proposed here to vectorize TRAIL using single-walled carbon nanotubes (SWCNTs) to mimic membrane TRAIL. Owing to their exceptional and revolutional properties, carbon nanotubes, especially SWCNTs, are used in a wide range of physical or, now, medical applications. Indeed due to their high mechanical resistance, their high flexibility and their hydrophobicity, SWCNTs are known to rapidly diffuse in an aqueous medium such as blood, opening the way of development of new drug nanovectors (or nanocarriers). Our TRAIL-based SWCNTs nanovectors proved to be more efficient than TRAIL alone death receptors in triggering cancer cell killing. These NPTs increased TRAIL pro-apoptotic potential by nearly 20-fold in different Human tumor cell lines including colorectal, nonsmall cell lung cancer, or hepatocarcinomas. We provide thus a proof-of-concept that TRAIL nanovector derivatives based on SWCNT may be useful to future nanomedicine therapies.
- Published
- 2015
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