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Density-dependent pair interactions in 2D colloidal suspensions

Brunner, M. ; Bechinger, C. ; Strepp, W. ; Lobaskin, V. ; von Grünberg, H. H.

Europhysics letters, 2002-06, Vol.58 (6), p.926-965 [Periódico revisado por pares]

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Título:
Density-dependent pair interactions in 2D colloidal suspensions
Autor: Brunner, M. ; Bechinger, C. ; Strepp, W. ; Lobaskin, V. ; von Grünberg, H. H.
Assuntos: 05.40.-a ; 61.20.-p ; 82.70.Dd ; Chemistry ; Colloidal state and disperse state ; Exact sciences and technology ; General and physical chemistry ; Physical and chemical studies. Granulometry. Electrokinetic phenomena
É parte de: Europhysics letters, 2002-06, Vol.58 (6), p.926-965
Notas: istex:78DF17C3564A2DB91E92CFAEA785AC4175B1FC19
ark:/67375/80W-71044S8B-T
publisher-ID:7126
Descrição: We experimentally determine effective interparticle potentials in a two-dimensional (2D) colloidal system of charge-stabilized polystyrene particles at different particle densities ρ. Density variation is achieved by means of a scanned optical laser tweezer which serves to create a boundary box for the system. By changing the size of this boundary box, ρ can be systematically varied without having to prepare a new system. From the measured radial distribution functions we can then obtain the effective pair potentials of the particles. While for low particle densities perfect agreement with Yukawa-like potentials is observed, considerable deviations from this form are found at higher densities. We interpret this result as a many-body effect produced by macroion screening which is expected to become more pronounced as the density is increased.
Editor: Les Ulis: EDP Sciences
Idioma: Inglês

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