Effect of Precursor pH on One-dimensional Growth of Mullite Prepared by Sol-Gel Method with WO3 Catalyst

doi:10.3724/SP.J.1077.2009.09222

Abstract

Abstract: One-dimensional mullite particles were synthesized by sol-gel method from hydrous aluminum chloride (AlCl₃·6H₂O) and tetraethoxysilane (TEOS) as raw materials and WO₃ as catalyst. WO₃ had a desired effect on the anisotropic growth of mullite particles by forming aluminum tungstate (AlWO₄) as growth template at low temperature, which was greatly dependent on the precursor pH. NMR results indicate that the pH during gelation can highly influence the homogeneity of precursor, mullite formation and microstructural features. One-dimensional mullite particles are significant only when the precursor pH is lower than 7. Morphology of the mullite particles synthesized with pH≥7 transforms from anisotropy to isotropy and platelike.

Key words: mullite, sol-gel, one-dimensional growth, WO₃, pH

CLC Number:

TQ174

WU Jiang,LIN Hong,LI Jian-Bao,LI Jun-Feng. Effect of Precursor pH on One-dimensional Growth of Mullite Prepared by
Sol-Gel Method with WO₃ Catalyst[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2009.09222.

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Effect of Precursor pH on One-dimensional Growth of Mullite Prepared by
Sol-Gel Method with WO₃ Catalyst

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