title: AC electrophoretic deposition of organic-inorganic composite coatings.
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.
authors.affiliation: Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology, 152-8550 Tokyo, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Yoshioka
authors.affiliation: Institute of Biomaterials, University of Erlangen-Nuremberg, 91058 Erlangen, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Chávez-Valdez
authors.affiliation: Institute of Polymer Materials, University of Erlangen-Nuremberg, 91058 Erlangen, Germany.
authors.forename: J A
authors.initials: JA
authors.lastname: Roether
authors.affiliation: Institute of Polymer Materials, University of Erlangen-Nuremberg, 91058 Erlangen, Germany.
authors.forename: D W
authors.initials: DW
authors.lastname: Schubert
authors.affiliation: Institute of Biomaterials, University of Erlangen-Nuremberg, 91058 Erlangen, Germany. Electronic address: aldo.boccaccini@ww.uni-erlangen.de.
authors.forename: A R
authors.initials: AR
authors.lastname: Boccaccini
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D004566:Electrodes; D004586:Electrophoresis; D053758:Nanoparticles / Q000737:chemistry; D012996:Solutions; D013193:Stainless Steel / Q000737:chemistry; D014025:Titanium / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D000180:Acrylic Resins; D012996:Solutions; D014867:Water; D013193:Stainless Steel; C009495:titanium dioxide; C006903:carbopol 940; D014025:Titanium