A new formula for the dynamic mobility in a concentrated colloid

The dynamic mobility μ D is the analogue of the electrophoretic mobility in an alternating electric field. It can be determined for suspensions of arbitrary concentration at MHz frequencies using electroacoustic measurements. A considerable amount of effort has been expended during the last decade i...

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Published inColloids and surfaces. A, Physicochemical and engineering aspects Vol. 218; no. 1; pp. 89 - 101
Main Authors O'Brien, R.W., Jones, A., Rowlands, W.N.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 29.05.2003
Subjects
Colloids
Dynamic mobility
Electroacoustic
Emulsions
ESA
Dynamic mobility
Electroacoustic
ESA
Emulsions
Colloids
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Summary:The dynamic mobility μ D is the analogue of the electrophoretic mobility in an alternating electric field. It can be determined for suspensions of arbitrary concentration at MHz frequencies using electroacoustic measurements. A considerable amount of effort has been expended during the last decade in the derivation of theories for the dynamic mobility in concentrated suspensions. The objective has been to come up with a formula that can be used to calculate particle size and zeta potential from dynamic mobility measurements in concentrated suspensions. Some of these theories are based on cell models, others are based on coupled phase models and another involves the use of experimentally determined parameters. In this paper we present a new approach to this problem. We derive a formula that does not involve any ad hoc boundary conditions or adjustable parameters. The formula is compared with experimental measurements, and is used to determine size and zeta potential for a number of concentrated colloids.
ISSN:0927-7757
1873-4359
DOI:10.1016/S0927-7757(02)00593-9