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Croatica Chemica Acta, Vol.80 No.3-4 November 2007. -

Electroacoustic techniques are promising tools for the size determination and electrokinetic

characterization of concentrated colloidal suspensions. When particles are not homogeneous in

size and-or density, the dynamic mobility obtained is a kind of average of the mobilities of

every particle. In this paper, we try to discern which averaging procedure provides a better

description of the dynamic mobility of bidisperse suspensions consisting of a mixture of two

very different types of particles. The results show that the amplitude of the sound wave induced

by an applied ac field electrokinetic sonic amplitude is not just the sum of the amplitudes

of the waves generated by every particle but has a larger contribution from the larger particles,

although the small size entities considerably influence the behaviour of the latter because of

their interference in the fluxes of the fluid and ions around them.

electrokinetics; ESA; polydisperse suspensions; electroacoustics



Autor: María L. Jiménez - ; Department of Applied Physics, Faculty of Science, University of Granada, Spain Francisco J. Arroyo - ; De

Fuente: http://hrcak.srce.hr/



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