3-DIMENSIONAL PARTICLE TRACKING FOR THE CHARACTERIZATION OF MICROMETER-SIZE COLLOIDAL PARTICLES

被引:12
|
作者
GRASSELLI, Y
BOSSIS, G
机构
[1] Laboratoire de Physique de la Maiiere Condensée, CNRS Université de Nice, Nice Cedex 02, 06108, Parc Valrose
关键词
D O I
10.1006/jcis.1995.1097
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A simple technique based on microscopy and computer digitalized images is used to record the three-dimensional trajectory of colloidal particles, The vertical motion is controlled with the help of a piezoelectric actuator and a procedure has been developed in order to keep the particle in the focal plane. This technique allows one to obtain simultaneously the hydrodynamic radius and the density of a particle by following both the Brownian motion and the sedimentation. A demonstration of the capability of the method is given for micrometer-size latex particles. With semitransparent electrodes it is also possible to determine the electrophoretic mobility of a particle. We show that this determination is more accurate than using electrophoretic light scattering when the particles have a low mobility, We apply this technique to determine the diameter, the density, and the zeta potential of silica particles in silicone oil. (C) 1995 Academic Press, Inc.
引用
收藏
页码:269 / 274
页数:6
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