Electrophoresis system for high temperature mobility measurements of nanosize particles

Victor Rodriguez-Santiago, Mark V. Fedkin, Serguei N. Lvov

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

The electrophoretic mobility, which reflects the zeta potential of a solid material, is an important experimental quantity providing information about the electrical double layer at the solid/liquid interface. A new high temperature electrophoresis cell was developed suitable for electrophoretic mobility measurements of dispersed nanosize particles up to 150 °C and 40 bars. Amorphous silica (SiO2) particle size standards were used to test the particle size detection limit of the new instrument at 25, 100, and 150°C and several pH values. The microscopic detection of the particles was enabled by dark-field illumination, which allowed extending the previously available capabilities and provided higher accuracy of the electrophoretic mobility data. The electrophoretic mobility measurements for SiO2 at temperatures above 100°C were reported for the first time and indicated a gradual increase in particle electrophoretic response with increasing temperature. The obtained data indicated negatively charged SiO2 surface throughout the pH and temperature ranges studied.

Original languageEnglish (US)
Article number093302
JournalReview of Scientific Instruments
Volume79
Issue number9
DOIs
StatePublished - Oct 9 2008

All Science Journal Classification (ASJC) codes

  • Instrumentation

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