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Collective Thermal Diffusion of Silica Colloids Studied by Nonlinear Optics (Articolo in rivista)

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Collective Thermal Diffusion of Silica Colloids Studied by Nonlinear Optics (Articolo in rivista) (literal)

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Alternative label

Neda Ghofraniha (1); Giancarlo Ruocco (1,2); Claudio Conti (2) (2009)
Collective Thermal Diffusion of Silica Colloids Studied by Nonlinear Optics
in Langmuir; ACS, American chemical society, Washington, DC (Stati Uniti d'America)
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(1) Dipartimento di Fisica - Universita' \"La Sapienza\", Piazzale Aldo Moro 5, 00185, Rome, Italy (2) SOFT-INFM-CNR, c/o Universita' \"La Sapienza\", Piazzale Aldo Moro 5, 00185, Rome, Italy (literal)

Titolo

Collective Thermal Diffusion of Silica Colloids Studied by Nonlinear Optics (literal)

Abstract

We investigate the collective thermal diffusion of silica charged spheres in Sulpho-Rhodamine B/water solution at different concentrations by measuring time-dependent thermal and Soret lensings. We show a significant concentration-dependence of the thermal diffusion coefficient D(T), not previously reported. Moreover, the results clearly show that both mass diffusion and Soret coefficient are collective quantities being strongly dependent on the particles' packing fraction. Our Z-scan setup allows us to investigate the dynamics of the system at low wave vector, which addresses the influence of the interparticle interactions oil the thermal diffusion of the colloids. (literal)

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