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Electrophoretic Deposition (EPD): Mechanisms, Kinetics, and Application to Ceramics
Author(s) -
Sarkar Partho,
Nicholson Patrick S.
Publication year - 1996
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1996.tb08929.x
Subject(s) - electrophoretic deposition , dlvo theory , deposition (geology) , suspension (topology) , ceramic , materials science , constant voltage , voltage , constant current , particle (ecology) , electrophoresis , chemical engineering , electrode , chemistry , analytical chemistry (journal) , nanotechnology , coating , composite material , current (fluid) , thermodynamics , chromatography , electrical engineering , physics , colloid , mathematics , oceanography , engineering , biology , paleontology , homotopy , sediment , geology , pure mathematics
The mechanisms of electrophoretic deposition (EPD) are discussed and their shortcomings identified. The kinetics of the processes involved are analyzed for constant‐current and constant‐voltage conditions. A method of determining the Hamaker constant of suspended particles is developed by modeling the relationship between the particle inter‐action energy and the suspension stability. A three‐probe dc technique is used to map the voltage profile around the depositing electrode, and the results are used to explain discrepancies between the calculated and experimentally observed voltage drops during deposition. A mechanism of deposition is proposed based on DLVO theory and particle double‐layer distortion/thinning on application of a dc field to the suspension. Kinetic equations are developed for constant‐current and constant‐voltage EPD using mass balance conditions; these are verified by experiments. After the phenomenon is introduced and discussed, a critique of the application of EPD to the synthesis of ceramic shapes and coatings is given.