Anodic Electrophoretic Deposition of TiO_2 Nanoparticles Synthesized Using Sol Gel Method

摘要

Many researches on electrophoretic deposition of TiO_2 nanoparticles (NPs) use commercial TiO_2 nanoparticles from Degussa. TiO_2 from Degussa is not use in this research because in order to make the TiO_2 nanoparticle electronically charged and move under an applied constant voltage, a small amount of iodine and acetylacetone needs to be added to the suspension. It is suggested that the H~+ ions generated by the reaction is absorbed on the suspended particles making them positively charged. For anodic EPD, negatively charged nanoparticles are required. In this research TiO_2 nanoparticles were prepared by adding 1 ml of titanium isopropoxide dilute with 1 ml ethanol to 10 ml DI water and stirrer under 0°C for 4 hr. As prepared TiO_2 nanoparticle were centrifuged at 5500 rpm for 10 min to isolate the particles from the solution. Then the TiO_2 nanoparticles were resuspended in ethanol or water. TiO_2 nanoparticle with particle diameter of 4.66 nm and anatase phase were produced. Important electrophoretic deposition process parameters, such as apparent pH of the TiO_2 NPs, applied voltage, deposition time and solid loading, were studied during electrophoretic deposition of TiO_2 nanoparticles.