AC electrophoretic deposition of organic-inorganic composite coatings

作者：Yoshioka T; Chavez Valdez A; Roether J A; Schubert D W; Boccaccini A R^*

来源：Journal of Colloid and Interface Science, 2013, 392: 167-171.

DOI：10.1016/j.jcis.2012.09.087

• Electrophoretic deposition (EPD)
• Alternating current (AC)
• Polyacrylic acid (PAA)
• Titanium oxide (TiO2)
• Nanoparticles
• Composites
• Coatings

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 1 kHz. 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 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 I kHz leads to uniform PAA-TiO2 composite coatings on conductive materials.

• 出版日期2013-2-15