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2.1. Synthesis of titania microspheres with hierarchical structures
0.25 mL of nonanoic acid was dropped into 20 mL of absolute
alcohol and 80 uL of 0.1 mol/L KCl aqueous solution was added. After
stirring for 15 min, 0.5 mL of tetra-n-butyl titanate was added under
violently stirring. 5 min later, 1 mL of double distilled water was
added. The milky white precursor microspheres suspension was kept
static for 24 h and collected by centrifugation.
The precursor microspheres were dispersed in an ethanol-aqueous
solution. Then the suspension was sealed within a Teflon-lined
autoclave (25 mL) and heated at 160 ¡ãC for 16 h. Following wash with
ethanol three times, the precipitate was dried at 40 ¡ãC. The
hydrothermal products were further calcined at 600 ¡ãC for 4 h to
obtain the targeted products.
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