Institut Charles Sadron : Scientific Report 2007-2011 – Institut Charles Sadron
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Characterization of Zirconium Phosphate/Polycation Thin Films Grown by Sequential Adsorption Reactions
1414 Chem. Mater. 1997, 9, 1414-1421 Characterization of Zirconium Phosphate/Polycation Thin Films Grown by Sequential Adsorption Reactions Hyuk-Nyun Kim, Steven W. Keller,† and Thomas E. Mallouk* Department of Chemistry, Pennsylvania State University, University Park, Pennsylvania 16802 Johannes Schmitt Institut fu¨ r Physikalische Chemie, Johannes Gutenberg-Universita¨t, D-55099 Mainz, Germany Gero Decher Institut Charles Sadron, Universite´ Louis Pasteur, F-67083 Strasbourg Cedex, France Received January 6, 1997. Revised Manuscript Received April 7, 1997X Monolayer and multilayer thin films consisting of anionic R-zirconium phosphate (R-ZrP) sheets and polycations (poly(allylamine hydrochloride) (PAH), cytochrome c) were character- ized by transmission electron microscopy (TEM), ellipsometry, UV-visible absorbance spectroscopy, reflectance FT-IR, XPS, and X-ray diffraction. Titration and powder X-ray diffraction experiments confirm that exfoliation of R-ZrP begins to occur when enough tetra- (n-butylammonium) hydroxide (TBA+OH-) has been added to exceed single-layer packing + + - of TBA ions (x 0.50) in the intercalation compound Zr(HPO4)2-x(TBA PO4 )x‚nH2O. The identical contrast≈ of many sheets in TEM micrographs suggests that the suspension is unilamellar. Alternately dipping cationic substrates into R-ZrP-containing suspensions and aqueous PAH gives a multilayer film that resembles the corresponding bulk intercalation compound. X-ray photoelectron spectra of multilayer films show that they are Zr-rich, relative to R-ZrP, consistent with some corrosion during the exfoliation reaction. The R-ZrP/ PAH layer pair thickness is 13/14.7 Å, as measured by ellipsometry/X-ray diffraction, respectively. A 13-layer pair film is sufficiently well-ordered in the stacking direction to give a Bragg peak in the diffraction pattern. -
Surface Polarization Effects in Confined Polyelectrolyte Solutions
Surface polarization effects in confined polyelectrolyte solutions Debarshee Bagchia , Trung Dac Nguyenb , and Monica Olvera de la Cruza,b,c,1 aDepartment of Materials Science and Engineering, Northwestern University, Evanston, IL 60208; bDepartment of Chemical and Biological Engineering, Northwestern University, Evanston, IL 60208; and cDepartment of Physics and Astronomy, Northwestern University, Evanston, IL 60208 Contributed by Monica Olvera de la Cruz, June 24, 2020 (sent for review April 21, 2020; reviewed by Rene Messina and Jian Qin) Understanding nanoscale interactions at the interface between ary conditions (18, 19). However, for many biological settings two media with different dielectric constants is crucial for con- as well as in supercapacitor applications, molecular electrolytes trolling many environmental and biological processes, and for confined by dielectric materials, such as graphene, are of interest. improving the efficiency of energy storage devices. In this Recent studies on dielectric confinement of polyelectrolyte by a contributed paper, we show that polarization effects due to spherical cavity showed that dielectric mismatch leads to unex- such dielectric mismatch remarkably influence the double-layer pected symmetry-breaking conformations, as the surface charge structure of a polyelectrolyte solution confined between two density increases (20). The focus of the present study is the col- charged surfaces. Surprisingly, the electrostatic potential across lective effects of spatial confinement by two parallel surfaces -
Assembling of Prussian Blue Nanoclusters Along Single
Assembling of Prussian Blue Nanoclusters Samples preparation. PMB was deposited onto the substrate from the 0.0005 g/l acid water (pH 2, HCl, Aldrich) solution by the dipping of the Along Single Polyelectrolyte Molecules substrate into the solution or by drop casting. To deposit PC chains in stretched conformation we placed several drops of the solution onto Anton Kiriy1, Vera Bocharova1, Ganna Gorodyska1, Sergiy Minko2, the substrate rotating at 10000 rpm. The dry samples were and Manfred Stamm1 investigated with AFM. Deposition of PB clusters. To prepare a dispersion of PB clusters, the 1 Institut für Polymerforschung Dresden, Hohe Strasse 6, 01069 solution of K4Fe(CN)6·3H20 (0.5 g/l, 1.18 mMol/l) in acid water (HCl, pH Dresden, Germany 2.0) and equal volume of the FeCl3 solution (0.048 g/l, 0.296 mMol/l) in 2Department of Chemistry, Clarkson University, Potsdam, NY 13699- acid water (HCl, pH 2.0) were intensively mixed for several minutes. 5810 The substrate with deposited PC was then dipped into the freshly prepared dispersion of PB clusters for 3 min at ambient temperature and afterward rinsed in water. Finally, the substrate was dried with the INTRODUCTION Argon flux. Molecular electronics is attracting considerable interest of AFM measurements. Multimode AFM instrument or NanoScope IV- scientists because of physical and economic limitations expected for D3100 (Digital Instruments, Santa Barbara) were operating in the existing bottom down lithographic technologies. The use of various tapping mode. Silicon tips with radius of 10-20 nm, spring constant of biological templates to assemble nanoscale nonbiological building 30 N/m and resonance frequency of 250-300 KHz were used after the blocks into well-defined meso- and macroscopic objects1 is nn calibration with gold nanoparticles (5 nm in diameter). -
Localized Enzyme-Assisted Self-Assembly in the Presence of Hyaluronic Acid for Hybrid Supramolecular Hydrogel Coating
polymers Communication Localized Enzyme-Assisted Self-Assembly in the Presence of Hyaluronic Acid for Hybrid Supramolecular Hydrogel Coating Jennifer Rodon Fores 1 , Alexis Bigo-Simon 1 ,Déborah Wagner 1, Mathilde Payrastre 1, Camille Damestoy 1, Lucille Blandin 1, Fouzia Boulmedais 1, Julien Kelber 1, Marc Schmutz 1 , Morgane Rabineau 2,3, Miryam Criado-Gonzalez 1,2,3,* , Pierre Schaaf 1,2,3,* and Loïc Jierry 1,* 1 Institut Charles Sadron (UPR22), Université de Strasbourg, CNRS, 23 rue du Loess, CEDEX 2, BP 84047, 67034 Strasbourg, France; [email protected] (J.R.F.); [email protected] (A.B.-S.); [email protected] (D.W.); [email protected] (M.P.); [email protected] (C.D.); [email protected] (L.B.); [email protected] (F.B.); [email protected] (J.K.); [email protected] (M.S.) 2 Institut National de la Santé et de la Recherche Médicale, INSERM Unité 1121, CRBS, 1 rue Eugène Boeckel, CEDEX, 67085 Strasbourg, France; [email protected] 3 Faculté de Chirurgie Dentaire, Université de Strasbourg, 8 rue Sainte Elisabeth, 67000 Strasbourg, France * Correspondence: [email protected] (M.C.-G.); [email protected] (P.S.); [email protected] (L.J.); Tel.: +91-25-8-74-97 (M.C.-G.); +33-3-68-85-33-87 (P.S.); +33-3-68-41-41-47(L.J.) Abstract: Hydrogel coating is highly suitable in biomaterial design. It provides biocompatibility and avoids protein adsorption leading to inflammation and rejection of implants. Moreover, hydrogels can be loaded with biologically active compounds. In this field, hyaluronic acid has been largely studied as an additional component since this polysaccharide is naturally present in extracellular matrix. -
Electrostatic Effects in Soft Matter and Biophysics NATO Science Series
Electrostatic Effects in Soft Matter and Biophysics NATO Science Series A Series presenting the results of scientific meetings supported under the NArO Science Programme. The Series is published by 10S Press, Amsterdam, and Kluwer Academic Publishers in conjunction with the NATO Scientific Affairs Division Sub-Series 1. Life and Behavioural Sciences 10S Press II. Mathematics, Physics and Chemistry Kluwer Academic Publishers III. Computer and Systems Science 10S Press IV. Earth and Environmental Sciences Kluwer Academic Publishers The NATO Science Series continues the series of books published formerly as the NATO ASI Series. The NATO Science Programme offers support for collaboration in civil science between scientists of countries of the Euro-Atlantic Partnership Council. The types of scientific meeting generally supported are "Advanced Study Institutes" and "Advanced Research Workshops", and the NATO Science Series collects together the results of these meetings. The meetings are co-organized bij scientists from NATO countries and scientists from NATO's Partner countries - countries of the CIS and Central and Eastern Europe. Advanced Study Institutes are high-Ievel tutorial courses offering in-depth study of latest advances in a field. Advanced Research Workshops are expert meetings aimed at critical assessment of a field, and identification of directions for future aetion. As a consequence of the restrueturing of the NATO Science programme in 1999, the NATO Science Series was re-organized to the four sub-series noted above. Please consult the following web sites for information on previous volumes published in the Series. http://www.nato.intlscience http://www.wkap.nl http://www.iospress.nl http://www.wtv-books.de/nato-pco.htm Series II: Mathematics, Physics and Chemistry - Voi. -
Monolithic Cells for Solar Fuels Chem Soc Rev
Volume 43 Number 23 7 December 2014 Pages 7957–8194 Chem Soc Rev Chemical Society Reviews www.rsc.org/chemsocrev Includes a collection of articles on the theme of CO2 Capture and Chemical Recycling ISSN 0306-0012 TUTORIAL REVIEW Johan A. Martens et al. Monolithic cells for solar fuels Chem Soc Rev View Article Online TUTORIAL REVIEW View Journal | View Issue Monolithic cells for solar fuels† a a b c d Cite this: Chem. Soc. Rev., 2014, Jan Ronge´, Tom Bosserez, David Martel, Carlo Nervi, Luca Boarino, a b c a 43,7963 Francis Taulelle, Gero Decher, Silvia Bordiga and Johan A. Martens* Hybrid energy generation models based on a variety of alternative energy supply technologies are considered the best way to cope with the depletion of fossil energy resources and to limit global warming. One of the currently missing technologies is the mimic of natural photosynthesis to convert carbon dioxide and water into chemical fuel using sunlight. This idea has been around for decades, but artificial photosynthesis of organic molecules is still far away from providing real-world solutions. The scientific challenge is to perform in an efficient way the multi-electron transfer reactions of water oxidation and carbon dioxide reduction using holes and single electrons generated in an illuminated semiconductor. In this tutorial review the design of photoelectrochemical (PEC) cells that combine solar water oxidation and CO2 reduction is discussed. In such PEC cells simultaneous transport and efficient use of light, electrons, protons and molecules has to be managed. It is explained how efficiency can be Creative Commons Attribution-NonCommercial 3.0 Unported Licence. -
AND MICROCARRIER FABRICATION a Thes
A NOVEL μ-FLUIDIC CHANNEL ASSISTED ENCAPSULATION TECHNIQUE FOR LAYER-BY-LAYER POLYMER NANO- AND MICROCARRIER FABRICATION A Thesis Presented to The Graduate Faculty of The University of Akron In Partial Fulfillment of the Requirements for the Degree Master of Science Jingyu Li August, 2015 A NOVEL μ-FLUIDIC CHANNEL ASSISTED ENCAPSULATION TECHNIQUE FOR LAYER-BY-LAYER POLYMER NANO- AND MICROCARRIER FABRICATION Jingyu Li Thesis Approved: Accepted: Advisor Department Chair Dr. Younjin Min Dr. Sadhan C. Jana Committee Member Dean of the College Dr. Mukerrem Cakmak Dr. Eric J. Amis Committee Member Interim Dean of the Graduate School Dr. Hossein Tavana Dr. Rex D. Ramsier Date ii ABSTRACT Layer-by-layer (LbL) assembly is a popular technique for fabricating thin multilayer films on templates by depositing alternating layers of oppositely charged polyelectrolytes with rinsing steps in between. The LbL technique fabricated capsules can be used for biomedical applications such as drug and vaccine delivery, biosensors and bioreactors. LbL assembly enables us to use various types, sizes, and shapes of particles as templates, like silica particles, calcium carbonate particles and metal particles. In addition, a suite of water-soluble polymers with different properties can be applied to LbL assembly to meet researchers` requirements. Due to accurate control on size and shape, LbL technique is capable of fabricating small particles below 200 nm, which is in the optimal size for drug carriers and small enough to avoid clogging blood capillaries. The versatility of nano- and microcapsules has captured the attention of researchers to develop fabrication methods of LbL particles. The traditional LbL assembly method has simple process, but which is inefficient and has limitations due to repeated centrifugation steps. -
Gero Decher, Jean-Claude Voegel La Recherche, No
An Introduction to Polyelectrolyte Multilayers Layer-by-Layer Adsorption (LbL): An Enabling Technology for the Nano- construction of Multifunctional Films on Solvent Accessible Surfaces. G. Decher / Institut Charles Sadron Institut Charles Sadron 1 Differences between chemistry in bulk and at interfaces Some trivia: • Surface functional groups accessible only from the solution side. ( SN1 might be favored over SN2 ; reactivities different from bulk) • Typical monolayer thicknesses of 0.5 nm to 5 nm. • Typical surface areas of 0.20 nm2 per molecule, 5 1014 molecules per cm2. • At a mass of 400 g/mol, 1 cm2 of a densely packed monolayer corresponds to 0.33 µg of material. • 5g (semi-preparative scale), would cover an area of 1500 m2. • Monomolecular layers of polymer may be thinner and less dense and typically consist of 0.1 to 1.5 mg of material per 1 m2. • Less than 0.02 mg for chemical analysis and physical characterization Advantage: We only need tiny amounts from colleagues doing synthesis Institut Charles Sadron 4 Build-to-Order Assembled Films Build-to-Order (BTO) is the capability to quickly build standard or mass-customized products upon receipt of spontaneous orders without forecasts. Layer-by-Layer assembly allows to design functional surfaces and surface-based nano-devices in a "build-to-order" fashion. It exceeds simple self-organization under equilibrium conditions by making it possible to arrange many different materials at will with nanoscale precision. Institut Charles Sadron 5 The multilayer films that can do everything . Pierre Schaaf, Gero Decher, Jean-Claude Voegel La Recherche, No. 389, SEPT. -
Gelation-Driven Component Selection in the Generation of Constitutional Dynamic Hydrogels Based on Guanine-Quartet Formation
Gelation-driven component selection in the generation of constitutional dynamic hydrogels based on guanine-quartet formation Nampally Sreenivasachary and Jean-Marie Lehn* Laboratoire de Chimie Supramole´culaire, Institut de Science et d’Inge´nierie Supramole´culaires (ISIS), Universite´Louis Pasteur, 8 Alle´e Gaspard Monge, BP 70028, 67083 Strasbourg Cedex, France Contributed by Jean-Marie Lehn, March 1, 2005 The guanosine hydrazide 1 yields a stable supramolecular hydrogel Such processes form the basis of the recently developed dynamic based on the formation of a guanine quartet (G-quartet) in pres- combinatorial chemistry (5, 6), in which molecular recognition ence of metal cations. The effect of various parameters (concen- events have been implemented toward the generation of optimal tration, nature of metal ion, and temperature) on the properties of binding agents toward artificial or biological (7) molecular recep- this gel has been studied. Proton NMR spectroscopy is shown to tors through a target-driven shift in the distribution of the library allow a molecular characterization of the gelation process. Hydra- constituents toward the best binder(s). Changes in library constit- zide 1 and its assemblies can be reversibly decorated by acylhy- uents may also be caused by redistribution of components induced drazone formation with various aldehydes, resulting in formation by metal ion binding (8, 9) or environmental factors such as of highly viscous dynamic hydrogels. When a mixture of aldehydes temperature and pH (N. Giuseppone and J.-M.L., unpublished is used, the dynamic system selects the aldehyde that leads to the data). most stable gel. Mixing hydrazides 1, 9 and aldehydes 6, 8 in 1:1:1:1 The amplification of a given constituent of a CDL under the ratio generated a constitutional dynamic library containing the pressure of a self-organization process, such as the formation of an four acylhydrazone derivatives A, B, C, and D. -
UCLA Electronic Theses and Dissertations
UCLA UCLA Electronic Theses and Dissertations Title A Fundamental Perspective on Polyelectrolyte Coagulants and Flocculants in Water Treatment Permalink https://escholarship.org/uc/item/5f30h7k4 Author Bhattacharya, Arkadeep Publication Date 2021 Peer reviewed|Thesis/dissertation eScholarship.org Powered by the California Digital Library University of California UNIVERSITY OF CALIFORNIA Los Angeles A Fundamental Perspective on Polyelectrolyte Coagulants and Flocculants in Water Treatment A thesis submitted in partial satisfaction of the requirements for the degree Master of Science in Chemical Engineering by Arkadeep Bhattacharya 2021 ABSTRACT OF THE THESIS A Fundamental Perspective on Polyelectrolyte Coagulants and Flocculants in Water Treatment by Arkadeep Bhattacharya Master of Science in Chemical Engineering University of California Los Angeles, 2021 Professor Samanvaya Srivastava, Chair Coagulation and flocculation are important phenomena which find widespread applications in water treatment. Polyelectrolytes are charged macromolecules which have found relevance in this domain due to their proven efficiency and effectiveness. The objective of the thesis would be to review and emphasize the fundamental mechanisms on which both natural and synthetic polyelectrolyte coagulants and flocculants operate. Advances in understanding phase characteristics and structure of aggregated polyelectrolyte complexes post interaction with charged impurities are discussed. These would help elucidate the correlation between salient polyelectrolyte properties -
Dispersed and Deposited Polyelectrolyte Complexes and Their Interactions to Chiral Compounds and Proteins
Dispersed and deposited polyelectrolyte complexes and their interactions to chiral compounds and proteins Dissertation zur Erlangung des akademischen Grades Doctor rerum naturalium (Dr. rer. nat.) vorgelegt der Fakultät Mathematik und Naturwissenschaften der Technischen Universität Dresden von M. Sc. Wuye Ouyang geboren am 01.05.1979 in Zhenjiang, V.R. China Gutachter : Prof. Dr. Brigitte Voit Prof. Dr. Thomas Wolff Prof. Dr. Klaus D. Jandt Eingereicht am : 10.10.2008 Tag der Verteidigung: 14.01.2009 ABBREVIATION AFM Atomic force microscopy ASC Ascorbic acid ATR-FTIR Attenuated Total Reflectance - Fourier Transform Infrared Spectroscopy CD Circular dichroism COAC Coacervate phase CSA Camphorsulfonic acid CSP Chiral stationary phases D2O Heavy water / Deuterium oxide DLS Dynamic light scattering DMF Dimethylformamide EtOH Ethanol GA Glutardialdehyde GLU Glutamic acid H2SO4 Sulfuric acid H2O2 Hydrogen peroxide HCl Hydrochloric acid HSA Human serum albumin IEP Isoelectric point IR Infrared IRE Internal reflection element LB Langmuir-Blodgett film LBL Layer by layer LYZ Lysozyme MYO Myoglobin NaCl Sodium chloride NaClO4 Sodium perchlorate NaOH Sodium hydroxide i NC Nitrocellulose PANT Pantothenic acid PBS Phosphate buffer saline PCD Particle charge detector PDADMAC Poly(diallyldimethylammonium chloride) PDL Poly(D-lysine) PDI Polydispersity index PEC Polyelectrolyte complex nanoparticle PEC-0.66 Positively charged polyelectrolyte complex nanoparticle (n-/n+ = 0.66) PEC-1.50 Negatively charged polyelectrolyte complex nanoparticle (n-/n+ = -
ADVISORY NOTE Strasbourg, France, October 8Th 2009
ADVISORY NOTE Strasbourg, France, October 8th 2009 Details on SHIP-In R&D project revealed, a world-class project for French Research supported by the Alsace BioValley Cluster The SHIP-In research-and-development project has a single goal: developing new and innovative cellular systems for the biopharmaceutical industry. It received the label of the Alsace BioValley cluster in Alsace, France, in November 2008 and is co-sponsored by France’s Cancer Bio Santé and Medicen research poles. The pharmaceutical industry’s development of new therapeutic molecules requires the development and utilization of experimental cellular models that are both efficient and reliable. For a long time, the only possibility was to use stem cells extracted from human embryos. Apart from the difficulty of ensuring their availability, the use of such cells is also circumscribed by stringent ethical and regulatory constraints, which considerably hamper and slow the discovery of new medicines. Today, a new scientific approach offers an alternative to the use of embryonic stem cells, which is to start with adult human cells and reprogram them as multi-purpose cells. The SHIP-In project consists in optimizing this new technology to cater for the demands of the biopharmaceutical industry. The aim is to provide pharmaceutical and cosmetics companies with an unlimited supply of human cells which meet quality criteria that are not available today. Eventually, SHIP-In should facilitate the discovery of new molecules and generally speed up the therapeutic innovation process. “SHIP-In presents a unique opportunity for participating in the development of scientific advances that have been unanimously hailed at a world level,” declared Nicolas Carboni, the Director of the Alsace BioValley cluster, a partner in the project.