Fungus-mediated biosynthesis of silica and titania particles

Vipul Bansal, Debabrata Rautaray, Atul Bharde, Keda Ahire, Ambarish Sanyal, Absar Ahmad, Murali Sastry

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The synthesis of inorganic materials by biological systems is characterized by processes that occur at close to ambient temperatures, pressures and neutral pH. This is exemplified by biosilicification in marine organisms such as diatoms while laboratory-based synthesis of silica involves extreme temperature and pH conditions. We show here that silica and titania particles may be produced by challenging the fungus Fusarium oxysporum with aqueous anionic complexes SiF62- and TiF62- respectively. Extra-cellular protein-mediated hydrolysis of the anionic complexes results in the facile room temperature synthesis of crystalline titania particles while calcination at 300 °C is required for crystallization of silica.

Original languageEnglish
Pages (from-to)2583-2589
Number of pages7
JournalJournal of Materials Chemistry
Issue number26
Publication statusPublished - 2005
Externally publishedYes

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