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J Colloid Interface Sci. 2013 Feb 15;392:167-71. doi: 10.1016/j.jcis.2012.09.087. Epub 2012 Nov 8.

AC electrophoretic deposition of organic-inorganic composite coatings.

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1
Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology, 152-8550 Tokyo, Japan.

Abstract

Alternating current electrophoretic deposition (AC-EPD) of polyacrylic acid (PAA)-titanium oxide (TiO(2)) nanoparticle composites on stainless steel electrodes was investigated in basic aqueous solution. AC square wave with duty cycle of 80% was applied at a frequency of 1 kHz. FTIR-ATR spectra showed that both AC and direct current (DC) EPD successfully deposited PAA-TiO(2) composites. The deposition rate using AC-EPD was lower than that obtained in direct current DC-EPD. However, the microstructure and surface morphology of the deposited composite coatings were different depending on the type of electric field applied. AC-EPD applied for not more than 5 min led to smooth films without bubble formation, while DC-EPD for 1 min or more showed deposits with microstructural defects possibly as result of water electrolysis. AC-EPD was thus for the first time demonstrated to be a suitable technique to deposit organic-inorganic composite coatings from aqueous suspensions, showing that applying a square wave and frequency of 1 kHz leads to uniform PAA-TiO(2) composite coatings on conductive materials.

PMID:
23218240
DOI:
10.1016/j.jcis.2012.09.087
[Indexed for MEDLINE]
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