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Synthesis of Hollow Titania Powder by the Hydrothermal Method
Author(s) -
Chung ChiaJung,
Jean JauHo
Publication year - 2008
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2008.02414.x
Subject(s) - polyethylenimine , polyelectrolyte , aqueous solution , materials science , cationic polymerization , chemical engineering , coating , polystyrene , titanium , adsorption , layer (electronics) , hydrothermal circulation , acrylic acid , inorganic chemistry , polymer chemistry , chemistry , composite material , polymer , organic chemistry , copolymer , metallurgy , transfection , biochemistry , engineering , gene
A layer‐by‐layer method is used to coat titania on spherical polystyrene (PS) powders in an aqueous solution. To increase surface charge density, a negatively charged PS powder is sequentially adsorbed by a cationic polyethylenimine (PEI)/anionic ammonium salt of poly(acrylic acid)/cationic PEI polyelectrolytes. A precursor of a negatively charged titanium bis ‐ammonium lactate dihydroxide (TALH) is then precipitated onto the above positively charged PS. Repeating the coating processes of TALH/PEI in an aqueous solution, a uniform, multilayer TALH/PEI coating on PS powder is formed. A crystalline, spherical, hollow titania powder is then obtained by hydrothermal treatment of the above powder in an aqueous solution at temperatures higher than 350°C.