Volume 58, Number 6, June 2002
|Page(s)||926 - 965|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||01 June 2002|
Density-dependent pair interactions in 2D colloidal suspensions
für Physik, Universität Konstanz - 78457 Konstanz,
2 Institute of Physics, University of Fribourg - CH-1700 Fribourg, Switzerland
Accepted: 26 March 2002
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.
PACS: 82.70.Dd – Colloids / 05.40.-a – Fluctuation phenomena, random processes, noise, and Brownian motion / 61.20.-p – Structure of liquids
© EDP Sciences, 2002
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.