| Abstract
| - The measurement of electrophoretic mobility is commonly done by laser Doppler electrophoresis (LDE).Recently, a more sensitive technique, phase analysis light scattering (PALS), has been developed withparticular benefits for application to nonpolar systems. We have carried out PALS measurements of theelectrophoretic mobility (μ) of modified silica particles as a function of applied electric field. Our resultsare in poor agreement with LDE measurements on the same system. We show that this difference mightresult from the way in which PALS measurements are performed and suggest that, in this case, the knownfield-dependent mobility will cause artifacts in the PALS data. When the mobility is field-dependent, thisfactor must be accounted for appropriately in PALS data analysis.
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