Deposition of Compact Hydrous Aluminum Sulfate Thin Films on Titania Particles Coated with Organic Self-Assembled Monolayers

An organic self-assembled monolayer (SAM) was deposited on submicron-sized pigment-grade TiO2 particles to create a highly hydrophilic surface comprised of sulfonate groups. Hydrous aluminum-containing thin films were uniformly deposited on the powder from aqueous solutions at 60−80 °C. The as-depos...

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Bibliographic Details
Published in:Chemistry of materials 1998-08, Vol.10 (8), p.2135-2144
Main Authors: Wang, Yuhu, Supothina, Sitthisuntorn, De Guire, Mark R, Heuer, Arthur H, Collins, Rochael, Sukenik, Chaim N
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
Physical and chemical studies. Granulometry. Electrokinetic phenomena
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Summary:An organic self-assembled monolayer (SAM) was deposited on submicron-sized pigment-grade TiO2 particles to create a highly hydrophilic surface comprised of sulfonate groups. Hydrous aluminum-containing thin films were uniformly deposited on the powder from aqueous solutions at 60−80 °C. The as-deposited films were in the form of boehmite (AlO(OH)) or hydrous Al sulfate, depending on the Al salts used in the starting solution. AlCl3 solutions gave rise to porous films of needlelike crystalline boehmite, whereas mixed Al2(SO4)3/Al(NO3)3 solutions led to compact, uniform, adherent, dense amorphous sulfate-containing films up to ∼5 nm thick. The sulfate anion in solution is thought to promote nucleation and growth of a solid phase through its relatively strong electrostatic field. However, the sulfate anion is weakly bound, and the sulfate films can be partly leached of sulfur in neutral or weakly basic solutions at room temperature without sacrificing their compact nature.
ISSN:0897-4756
1520-5002
DOI:10.1021/cm980028y