無定形シリカ球の合成とその加熱性状

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タイトル別名
  • Preparation of amorphous silica particles and their thermal behavior
  • ムテイケイ シリカキュウ ノ ゴウセイ ト ソノ カネツ セイジョウ

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From Si(OC2H5)4-NH3-H2O-C2H5OH system, monodispersed suspensions of spherical silica particles of colloidal size were prepared by means of hydrolysis of tetraethyl silicate.<BR>Several attempts to produce silica spheres under the same experimental condition showed that a very narrow size distribution was always reproduced in each attempt, but it was not easy to obtain a constant median diameter.<BR>In general, larger particles were grown during aging at a lower temperature and at a higher ester concentration, but these factors had no influence on their standard deviations.<BR>An electron microscopic investigation of a series of samples were taken at different times from the same solution indicated that the spherical secondary particles were formed by coalescence of irregular shaped primary particles of a few hundreds Å diameter.<BR>X-ray diffraction pattern showed that the spherical particles were amorphous just like a silica gel, and no crystallization has been observed even if they were heated at 1000°C for 7 hr in air. Although differential thermal analysis curve of the particles was the same as those obtained from silica gel, there was a slight difference in an amount of weight loss during heating, which might be attributed to a different amount of physically absorbed water.

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