Concept

Longueur de Debye

Publications associées (69)

Diffusion of Single Molecules in Nanochannels

Philippe Renaud, Theo Lasser, Arnaud Bertsch, Nicolas Durand, Claudio Dellagiacoma, Raphaël Goetschmann

With fluorescence correlation spectroscopy (FCS), the diffusion and concentration of proteins (wheat germ agglutinin) in a nanofluidic system are measured on a single molecule level. By increasing the ionic concentration, the Debye length of the electrical ...

2009

Structure and Energy of Charged Domain Walls in Ferroelectrics

Nava Setter, Alexander Tagantsev, Maxim Gureev

The problem of the structure and energy of a charged 180-degree head-to-head domain wall is considered, using Landau theory. It was found that the scales controlling the wall structure can be very different from the Debye radius. Depending on the spontaneo ...

Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa2009

Magnetic screening in proximity effect Josephson-junction arrays

The modulation with magnetic field of the sheet inductance measured on proximity effect Josephson-junction arrays (JJAs) is progressively vanishing on lowering the temperature, leading to a low-temperature field-independent response. This behaviour is cons ...

2009

Effective Charge of Adsorbed Poly(amidoamine) Dendrimers from Direct Force Measurements

Ramon Pericet Camara, Michal Borkovec

Interaction forces between silica surfaces with adsorbed poly (amidoamine) (PAMAM) dendrimers were measured with the colloidal probe technique based on the atomic force microscope (AFM). At small separations, attractive non-DLVO forces are observed. These ...

American Chemical Society2009

Buckling and layering transitions in confined colloids

Christian David

We report layering transitions within a charged silica colloidal dispersion confined by two opposite like-charged dielectric walls. The ensemble- averaged concentration profiles of the colloids (radius 60 +/- 2 nm) along the confinement direction have been ...

2009

Particle transport in tokamak plasmas, theory and experiment

Henri Weisen, Mikhail Maslov, Emiliano Fable

The physical processes producing electron particle transport in the core of tokamak plasmas are described. Starting from the gyrokinetic equation, a simple analytical derivation is used as guidance to illustrate the main mechanisms driving turbulent partic ...

Institute of Physics2009

Transport phenomena in nanofluidics

Philippe Renaud, Reto Bruno Schoch

Transport of fluid in and around nanometer-sized objects with at least one characteristic dimension below 100 nm renders possible phenomena that are not accessible at bigger length scales. This research field is termed nanofluidics and received its name on ...

2008

Controlled Reversible Adsorption of Core-Shell Metallic Nanoparticles at the Polarized Water/1,2-Dichloroethane Interface Investigated by Optical Second-Harmonic Generation

Hubert Girault, Christophe Bauer, Pierre-François Marie Brevet, Jean-Pierre Abid

We report the observation of the reversible adsorption of core-shell gold-silver nanoparticles at the polarized water/1,2-dichloroethane interface using the nonlinear optical technique of surface second-harmonic generation. This study unambiguously demonst ...

2007

Confinement-induced liquid ordering investigated by x-ray phase retrieval

Hairun Guo, Christian David

Using synchrotron x-ray diffraction, we have determined the ensemble-averaged density profile of colloidal fluids within confining channels of different widths. We observe an oscillatory ordering-disordering behavior of the colloidal particles as a functio ...

2007

Field confinement with aberration correction for solid immersion lens based fluorescence correlation spectroscopy

Theo Lasser, Rainer Leitgeb, Ramachandra Rao, Jelena Mitic

The solid immersion lens (SIL) as a tool for increasing the field confinement as well as providing optimal performance by aberration compensation in a confocal fluorescence correlation spectroscopy (FCS) system is illustrated here. Using Zernike polynomial ...

2007

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