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- Robert Botet, Kalliopi N. Trohidou, John A. Blackman, Dimitris Kechrakos
- Physical review. E, Statistical, nonlinear, and…
- 2001

Since statistically isotropic fractal aggregates of particles are a particular case of self-organized critical systems, we describe formally field-induced behaviors of aggregated ferrofluids as responses of regular at-equilibrium critical systems at the critical point to the small field conjugated to its order parameter. This leads us to expect some general… (More)

- Ryohei Seto, Robert Botet, Heiko Briesen
- Physical review. E, Statistical, nonlinear, and…
- 2011

The hydrodynamic properties of rigid fractal aggregates have been investigated by considering their motion in shear flow in the Stokesian dynamics approach. Due to the high fluid viscosity and small particle inertia of colloidal systems, the total force and torque applied to the aggregate reach equilibrium values in a short time. Obtaining equilibrating… (More)

- Frédéric Mondiot, Robert Botet, Patrick Snabre, Olivier Mondain-Monval, Jean-Christophe Loudet
- Proceedings of the National Academy of Sciences…
- 2014

We present experiments and numerical simulations to investigate the collective behavior of submicrometer-sized particles immersed in a nematic micellar solution. We use latex spheres with diameters ranging from 190 to 780 nm and study their aggregation properties due to the interplay of the various colloidal forces at work in the system. We found that the… (More)

- Kevin Roger, Robert Botet, Bernard Cabane
- Langmuir : the ACS journal of surfaces and…
- 2013

Populations of droplets or particles dispersed in a liquid may evolve through Brownian collisions, aggregation, and coalescence. We have found a set of conditions under which these populations evolve spontaneously toward a narrow size distribution. The experimental system consists of poly(methyl methacrylate) (PMMA) nanodroplets dispersed in a solvent… (More)

- Robert Botet, Marek Płoszajczak, Jorge A. Gonzalez
- Physical review. E, Statistical, nonlinear, and…
- 2002

The spherical spin model with infinite-range ferromagnetic interactions is investigated analytically in the framework of nonextensive thermostatics generalizing the Boltzmann-Gibbs statistical mechanics. We show that for repulsive correlations, a weak-ferromagnetic phase develops. There is a tricritical point separating para-, weak-ferro, and ferro regimes.… (More)

- J B Madeline, Martine Meireles, Christian Bourgerette, Robert Botet, Ralf Schweins, Bernard Cabane
- Langmuir : the ACS journal of surfaces and…
- 2007

Aqueous suspensions of aggregated silica particles have been dewatered to the point where the colloidal aggregates connect to each other and build a macroscopic network. These wet cakes have been compressed through the application of osmotic pressure. Some cakes offer a strong resistance to osmotic pressure and remain at a low volume fraction of solids;… (More)

- Eugene Poliakov, Vladimir M. Shalaev, Vadim A. Markel, Robert Botet
- Optics letters
- 1996

Surface-enhanced Raman scattering (SERS) from a self-affine surface is shown to be very large. A theory is developed expressing this SERS in terms of the eigenmodes of a self-affine surface; the theory successfully explains the observed SERS from cold-deposited thin films that are known to have a self-affine structure. Spatial distributions of local fields… (More)

- Bernard Cabane, Joaquim Li, +5 authors Lucas Goehring
- Physical review letters
- 2016

We report small-angle x-ray scattering experiments on aqueous dispersions of colloidal silica with a broad monomodal size distribution (polydispersity, 14%; size, 8 nm). Over a range of volume fractions, the silica particles segregate to build first one, then two distinct sets of colloidal crystals. These dispersions thus demonstrate fractional… (More)

- Robert Botet, Marek Ploszajczak, Abdelahad Chbihi, Bernard Borderie, Dominique Durand, Jane Frankland
- Physical review letters
- 2001

We discuss the scaling laws of both the charged fragments multiplicity n fluctuations and the charge of the largest fragment Z(max) fluctuations for Xe + Sn collisions in the range of bombarding energies between 25A MeV and 50A MeV. We show at E(lab) > or similar to 32 MeV/A the transition in the fluctuation regime of Z(max) which is compatible with the… (More)

Nonlinear optical phenomena on rough self-affine metal surfaces are theoretically studied. Placing nonlinearly polarizable molecules on such surfaces results in strong enhancement of optical nonlinearities. A quasistatic approximation is used to calculate local-enhancement factors for the second and third harmonic generation, degenerate four-wave mixing,… (More)