AC electrophoretic deposition of organic-inorganic composite coatings

Tomohiko Yoshioka, A. Chávez-Valdez, J. A. Roether, D. W. Schubert, A. R. Boccaccini

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Alternating current electrophoretic deposition (AC-EPD) of polyacrylic acid (PAA)-titanium oxide (TiO2) 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 1kHz. FTIR-ATR spectra showed that both AC and direct current (DC) EPD successfully deposited PAA-TiO2 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 5min led to smooth films without bubble formation, while DC-EPD for 1min 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 1kHz leads to uniform PAA-TiO2 composite coatings on conductive materials.

Original languageEnglish
Pages (from-to)167-171
Number of pages5
JournalJournal of Colloid and Interface Science
Volume392
Issue number1
DOIs
Publication statusPublished - Feb 15 2013
Externally publishedYes

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Keywords

  • Alternating current (AC)
  • Coatings
  • Composites
  • Electrophoretic deposition (EPD)
  • Nanoparticles
  • Polyacrylic acid (PAA)
  • Titanium oxide (TiO)

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Colloid and Surface Chemistry

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