Abstract
Hollow silica microspheres were produced by coating yeast cells with amorphous SiO2. In the pptn. reaction, yeast cells of Saccharomyces cerevisiae were used as a biol. template. The silica shell was synthesized by the hydrolysis of tetraethylorthosilicate (TEOS) in water-alc. mixts. as solvent using ammonia as a catalyst according to the Stoeber process. The hollow microspheres were ...
Abstract
Hollow silica microspheres were produced by coating yeast cells with amorphous SiO2. In the pptn. reaction, yeast cells of Saccharomyces cerevisiae were used as a biol. template. The silica shell was synthesized by the hydrolysis of tetraethylorthosilicate (TEOS) in water-alc. mixts. as solvent using ammonia as a catalyst according to the Stoeber process. The hollow microspheres were characterized by means of SEM and TGA. Both smooth and textured coatings were prepd. The biol. template can be removed by calcining, after which the particle morphol. persists. Addnl., d. and light scattering coeffs. of the pigment were measured.
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