Electrophoretic deposition of chitosan

✍ Scribed by A. Simchi; F. Pishbin; A.R. Boccaccini

• Book ID: 113793062
• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 390 KB
• Volume: 63
• Category: Article
• ISSN: 0167-577X
• DOI: 10.1016/j.matlet.2009.07.046

✦ Synopsis

The electrophoretic deposition (EPD) of chitosan on metallic substrates was investigated. The electrophoretic mobility of the natural biopolymer in aqueous solution as a function of pH was studied. Because the protonation/deporotonation of chitosan is pH-dependent, the electrophoretic mobility and deposition rate is shown to increase with increasing pH from 2.9 to 4.1. The film growth rate is estimated to vary in the range 0.02–0.08µm/s depending on the pH value. At high growth rates (>0.05µm/s), a porous film is obtained due to hydrogen entrapment. The EPD method developed here is applicable for the surface modification of metal implants by chitosan to develop novel bioactive coatings.