Preparation of Titania Thick Films by Electrophoretic Sol-Gel Deposition Using Hydrothermally Treated Particles

Abstract

Thick titania films were prepared by the modified electrophoretic sol-gel deposition method. The titania par ticles prepared by the sol-gel method were hydrothermally treated at 250 under 5MPa and then calcined at 600 in air. The particles crystallized by the hydrothermal treatment showed no aggregation during the calcination and were easily re-dispersed in a mixture of ethanol and water to form stable titania sol. Thick titania films of ca. 20m in thickness were obtained on stainless steel sheets by electrophoretic deposition of the sol.

Structure of Polyphenylsilsesquioxane Particles Prepared by Two-Step Acid-Base Catalyzed Sol–Gel Process and Formation of Hollow Particles

“…It is well-known that the sol-gel method is an excellent procedure to prepare inorganic and inorganic-organic hybrid particles such as SiO 2 , 6 7 TiO 2 , 8 and polyorganosilsesquioxanes. [9][10][11][12][13][14][15][16][17][18][19][20] Among the polyorganosilsesquioxane particles, much attention has been focused on the preparation of polyphenylsilsesquioxane (PhSiO 3/2 ) particles, which have a siloxane structure with phenyl groups, by the sol-gel method.…”

Transparent Anatase Nanocomposite Films by the Sol–Gel Process at Low Temperatures

“…6 The sol-gel method, using metal alkoxides as the starting materials, is one of the most-promising techniques for fabrication of nanocomposites with a tailored structure and porosity. Several techniques that are based on the sol-gel method for the preparation of TiO 2 nanocomposites and TiO 2 porous films, such as TiO 2 / polymer nanocomposite films, 7 multilayered SiO 2 /TiO 2 nanoparticles in pillared clay, 8 TiO 2 porous films via microemulsion, 9 electrophoretic sol-gel deposition, 10 and others, 11,12 have been reported. However, these techniques still have disadvantages and inherent limitations; one of these limitations, for both TiO 2 nanocomposites and TiO 2 porous films, is that a high-temperature process is required to form anatase nanocrystals.…”

Characterization and Electrophoretic Deposition of Poly(Phenylsilsesquioxane)–Titania Hybrid Particles Prepared by the Sol–Gel Method

“…(1) Preparation of PhSiO 3/2 -TiO 2 Particles and Thick Films Figure 1 shows the flowchart for the preparation of (1Àx)PhSiO 3/2 Á xTiO 2 particles and thick films by the electrophoretic deposition. Phenyltriethoxysilane (PhSi(OEt) 3 ) and titanium tetra-n-butoxide (Ti(O-n-Bu) 4 ) were used as starting materials. PhSi(OEt) 3 dissolved in ethanol (EtOH) was hydrolyzed with diluted hydrochloric acid of 0.01 mass% HCl at room temperature for 3 h. The PhSi(OEt) 3 solution was added to the EtOH solution of Ti(O-n-Bu) 4 , and stirred for 1 h. Ammonia water containing 4 mass% NH 3 was added to the mixed solution, and the resultant solution was stirred for 2 h. The mole ratio of PhSi(OEt) 3 In the preparation of (1Àx)PhSiO 3/2 Á xTiO 2 thick films by the electrophoretic deposition, (1Àx)PhSiO 3/2 Á xTiO 2 colloidal sols were used without centrifugation.…”

“…V ARIOUS kinds of inorganic and organic-inorganic particles such as SiO 2 , 1,2 TiO 2 , 3 and poly(organosilsesquioxane) 4,5 have been prepared by the sol-gel method. The advantages of the preparation process are as follows: size-controlled, monodispersed particles are obtainable 1,2,4,5 ; particle morphology can also be varied by changing the preparation conditions.…”