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Journal of Inorganic Materials

Journal of Inorganic Materials >

2009 , Vol. 24 >Issue 5: 1077 - 1080

DOI: https://doi.org/10.3724/SP.J.1077.2009.09222

Research Letter

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

  • WU Jiang ,
  • LIN Hong ,
  • LI Jian-Bao ,
  • LI Jun-Feng
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  • （State Key Lab of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China）

Received date: 2009-04-01

  Revised date: 2009-05-18

  Online published: 2009-09-20

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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

Cite this article

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, 2009 , 24(5) : 1077 -1080 . DOI: 10.3724/SP.J.1077.2009.09222

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