A5038514424- Surfactants and Colloidal Systems
- Force Microscopy Techniques and Applications
- Electrostatics and Colloid Interactions
- Lipid Membrane Structure and Behavior
- Polymer Surface Interaction Studies
- Liquid Crystal Research Advancements
- Mechanical and Optical Resonators
- Material Dynamics and Properties
- Spectroscopy and Quantum Chemical Studies
- Iron oxide chemistry and applications
- Minerals Flotation and Separation Techniques
- Supramolecular Self-Assembly in Materials
- Food Chemistry and Fat Analysis
- Pickering emulsions and particle stabilization
- Advanced Materials and Mechanics
- Conservation Techniques and Studies
- Polymer Nanocomposites and Properties
- Building materials and conservation
- Luminescence and Fluorescent Materials
- Polydiacetylene-based materials and applications
- Hydrogels: synthesis, properties, applications
- Cultural Heritage Materials Analysis
- Material Properties and Processing
- Conducting polymers and applications
- Analytical Chemistry and Sensors
Institut Charles Sadron
2014-2024
Université de Strasbourg
2012-2024
Synchrotron soleil
2018-2024
Centre National de la Recherche Scientifique
1996-2023
Australian National University
1989-2007
Inserm
2005
Procter & Gamble (United States)
2001
Paul Pascal Research Center
1996
Université Paris-Sud
1984-1991
Laboratoire de physique des Solides
1991
The force as a function of separation is measured between two mica surfaces coated with adsorbed bilayers cetyltrimethylammonium bromide (CTAB) and immersed in aqueous ionic micellar solutions CTAB. At low separations double-layer forces are observed arise soley from the dissociated counterions free ${\mathrm{CTA}}^{+}$. large separations, repulsion reduced secondary minimum interaction potential deepens when concentration increased. Finally, at higher concentrations, structural effects...
Interactions between charged surfaces immersed in aqueous calcium solutions were measured using the surface force apparatus and atomic microscope. With apparatus, good agreement with previously reported measurements was found for mica dilute up to 0.1 M. However, at higher concentrations large discrepancies observed. Compared earlier work, strength of lower by two or three orders magnitude range diminished. Experiments microscope indicated similar force-distance profiles interaction silicon...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAtomic Force Microscopy: Imaging with Electrical Double Layer InteractionsTim J. Senden, Calum Drummond, and Patrick KekicheffCite this: Langmuir 1994, 10, 2, 358–362Publication Date (Print):February 1, 1994Publication History Published online1 May 2002Published inissue 1 February 1994https://pubs.acs.org/doi/10.1021/la00014a004https://doi.org/10.1021/la00014a004research-articleACS PublicationsRequest reuse permissionsArticle...
Long-range attractive forces between electrically neutral, glass surfaces, a sphere and plane are measured directly with an atomic force microscope. Charge neutrality is achieved by immersion in cationic surfactant solutions. The much larger magnitude than dispersion forces. Over wide range of ionic strength (Debye length ${\ensuremath{\kappa}}^{\ensuremath{-}1}$), addition salt [...
The classical geometries for the packing of amphiphile molecules in ordered phases lyotropic systems are lamellar phase where bilayers amphiphilic separated by water layers, and hexagonal cylinders arranged on a two-dimensional lattice. These only exist definite compositions water/amphiphile system; between them, there usually lies vast concentration region which allows system to cross from zero curvature (bilayers) finite (cylinders). problem with such intermediate regions is that they may...
Abstract Understanding how the evolving molecular composition of an oil paint layer on its transition to aged solid film affects dimensional change and mechanical properties is fundamental assessment material durability more broadly risk degradation paintings. Tensile properties—modulus elasticity strain at break—as well as cumulative shrinkage were determined for a selection paints from Mecklenburg’s Paint Reference Collection now after approximately 30 years drying. The found get stiffer...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of the intermediate phase and its transformation to lamellar in lithium perfluorooctanoate/water systemP. Kekicheff G. J. T. TiddyCite this: Phys. Chem. 1989, 93, 6, 2520–2526Publication Date (Print):March 1, 1989Publication History Published online1 May 2002Published inissue 1 March 1989https://pubs.acs.org/doi/10.1021/j100343a056https://doi.org/10.1021/j100343a056research-articleACS PublicationsRequest reuse permissionsArticle...
The SIRIUS beamline of Synchrotron SOLEIL is dedicated to X-ray scattering and spectroscopy surfaces interfaces, covering the tender mid-hard range (1.1-13 keV). has hosted a wide experiments in field soft interfaces beyond, providing various grazing-incidence techniques such as diffraction wide-angle (GIXD/GIWAXS), small-angle (GISAXS) fluorescence total reflection (TXRF). also offers specific sample environments tailored for situ complementary on solid liquid surfaces. Recently, added...
Processes of water condensation and desublimation on solid surfaces are ubiquitous in nature essential for various industrial applications, which crucial their performance. Despite significance, these processes not well understood due to the lack methods that can provide insight at nanolevel into very first stages phase transitions. Taking advantage synchrotron grazing-incidence wide-angle X-ray scattering (GIWAXS) environmental scanning electron microscopy (ESEM), two pathways frosting...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRefractive Index of Thin Aqueous Films Confined between Two Hydrophobic SurfacesPatrick Kekicheff and Olivier SpallaCite this: Langmuir 1994, 10, 5, 1584–1591Publication Date (Print):May 1, 1994Publication History Published online1 May 2002Published inissue 1 1994https://pubs.acs.org/doi/10.1021/la00017a043https://doi.org/10.1021/la00017a043research-articleACS PublicationsRequest reuse permissionsArticle Views412Altmetric-Citations64LEARN ABOUT...
The force as a function of separation between two mica surfaces immersed in reversed micellar system sodium bis(2-ethyl hexyl) sulfosuccinate (AOT)/water/heptane was measured for range concentrations with size and polydispersity the micelles remain constant. Measurements were carried out piezoelectric bimorph sensor which produces charge proportional to applied load. At low volume fractions is purely attractive van der Waals interaction, while at higher force-distance profile oscillates...
The force as a function of separation has been measured between two molecularly smooth mica surfaces immersed in dilute solution cytochrome c. At pH 5.7 this protein, which the shape flattened sphere, carries twelve net positive charges per unit and adsorbs on negatively charged surfaces. decay length for asymptotic form double-layer forces protein concentration is markedly less than classical Debye screening length. lengths are close agreement with derived by Mitchell Ninham highly...
Abstract Understanding paintings as physical systems is fundamental for advancing environmental specifications that would allow effective management of museum environments in terms reducing energy use and carbon emissions while maintaining high standards collection care. The current were derived using the criterion crack initiation undamaged, usually new, material. In reality, historical exhibit complex patterns called craquelures. present paper analyses painted wood which among category...
2014 Contrairement aux images couramment admises, la géométrie plate n'est pas configuration de plus basse énergie libre pour les bicouches SDS dans phase lamellaire SDS/eau.Par diffusion neutrons petits angles, nous observons une figure diffuse, qui s'ajoute taches diffraction caractéristiques toutes phases lamellaires.La diffuse loin du faisceau incident est produite par un arrangement défauts structure, dont pseudopériode 60 Å à l'intérieur d'une lamelle.La près causée des texture,...
With a surface forces apparatus we have measured the interaction between two surfaces immersed in isotropic and nematic phases of lyotropic solution near its lamellar phase. A smectic ordering shows up walls, giving specific oscillatory force profile that is shown to be sum contributions. The oscillations are elastic response stack mechanically constrained by confinement. shape base line supporting derives from distribution walls. In case fixed symmetric boundary conditions, background...
Diagrammes de diffraction des mesophases ordonnees ce systeme lyotrope. L'espace reciproque 6 change facon continue phases les plus hydratees (cylindres) aux moins (bicouches). Le comportement orientationnel bicouches ces orientees permet d'identifier plans cristallographiques. Deduction (approximative) du groupe d'espace