BICKEL, Thomas; BENHAMOU, Mabrouk; KAÏDI, Hamid

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BICKEL, Thomas
Centre de physique moléculaire optique et hertzienne [CPMOH]

BENHAMOU, Mabrouk
Laboratoire de Physique des Polymères et Phénomènes Critiques [Casablanca] [LPPPC]

KAÏDI, Hamid
Laboratoire de Physique des Polymères et Phénomènes Critiques [Casablanca] [LPPPC]

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Physical Review E : Statistical, Nonlinear, and Soft Matter Physics. 2004, vol. 70, p. 051404

American Physical Society

Resumen en inglés

Surface effects are generally prevailing in confined colloidal systems. Here we report on dispersed nanoparticles close to a fluid membrane. Exact results regarding the static organization are derived for a dilute solution of non-adhesive colloids. It is shown that thermal fluctuations of the membrane broaden the density profile, but on average colloids are neither accumulated nor depleted near the surface. The radial correlation function is also evaluated, from which we obtain the effective pair-potential between colloids. This entropically-driven interaction shares many similarities with the familiar depletion interaction. It is shown to be always attractive with range controlled by the membrane correlation length. The depth of the potential well is comparable to the thermal energy, but depends only indirectly upon membrane rigidity. Consequenses for stability of the suspension are also discussed.< Leer menos

Palabras clave

Colloids

Fluid membranes

Orígen

Importado de Hal

Centros de investigación

Laboratoire Ondes et Matière d'Aquitaine (LOMA) - UMR 5798