Background electrolyte correction for electrokinetic sonic amplitude measurements
- Univ. of Michigan, Ann Arbor, MI (United States)
Electroacoustics has recently been used to measure electrokinetic properties of colloidal systems. When an alternating electric field is applied to a colloidal suspension, charged particles in the liquid will move electrophoretically and create an alternating pressure wave. The electrokinetic sonic amplitude (ESA), which is the pressure amplitude per unit electric field, is related to the electrophoretic mobility and [zeta] potential. For a solid suspension in an electrolyte solution, the measured ESA signal is a combination of two signals: one for the solid and the other for the background electrolyte. Under certain operating conditions, the contribution from the background electrolyte signal is not negligible and must be subtracted from the measured value to arrive at the particle ESA value. Background electrolyte corrections were performed on a Geltech silica and a US Silica no. 40 quartz at two ionic strengths (0.01 and 0.1 M NaCl) covering the pH range 2-8. These corrections are important at high ionic strengths because the ESA signal for the solid decreases and the background signal increases with increasing ionic strength. 12 refs., 11 figs.
- DOE Contract Number:
- FG02-89ER60820
- OSTI ID:
- 5676946
- Journal Information:
- Langmuir; (United States), Vol. 9:11; ISSN 0743-7463
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
COLLOIDS
ELECTROPHORESIS
ACOUSTICS
ELECTRIC FIELDS
ELECTROLYTES
PH VALUE
POTENTIOMETRY
QUARTZ
SILICA
SODIUM CHLORIDES
ALKALI METAL COMPOUNDS
CHALCOGENIDES
CHLORIDES
CHLORINE COMPOUNDS
DISPERSIONS
HALIDES
HALOGEN COMPOUNDS
MINERALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
SILICON COMPOUNDS
SILICON OXIDES
SODIUM COMPOUNDS
TITRATION
400400* - Electrochemistry
360204 - Ceramics
Cermets
& Refractories- Physical Properties