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Particle Sizes of Fumed Silica

✍ Scribed by Herbert Barthel; Mario Heinemann; Michael Stintz; Benno Wessely

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 584 KB
Volume: 16
Category: Article
ISSN: 0934-0866
DOI: 10.1002/(sici)1521-4117(199908)16:4<169::aid-ppsc169>3.0.co;2-h

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✍ Herbert Barthel; Mario Heinemann; Michael Stintz; Benno Wessely 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 272 KB

Fumed silica is a synthetic amorphous silicon dioxide produced by burning silicon tetrachloride in an oxygen-hydrogen flame. Surface areas range from 50±400 m 2 /g. Using particle sizing techniques, fumed silica shows micron sized particles leading to surface areas markedly lower than expected. Fume

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Fumed silica was surface treated by hexyl (C6), octyl (C8), decyl (C10), hexadecyl (C16), and octadecyl(C18)trimethoxysilanes, and the products were evaluated from various aspects. The amounts of alkyl group introduced on silica surface were all within the range from 22 to 25 mmol/100 g. Such fumed

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✍ Thierry Aubry; Béatrice Largenton; Michel Moan 📂 Article 📅 1998 🏛 Elsevier Science 🌐 English ⚖ 84 KB

ARTICLE NO. CS985450 NOTE Study of Aggregate Density in Fumed Silica Suspensions All samples studied in this work were prepared by dispersing silica particles in 1 M acetic acid, the pH being adjusted to 4 with addition of Viscometric and sedimentation experiments were performed on NaOH; the corresp

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✍ Long Ngoc Dinh; Mehdi Balooch; James Daniel LeMay 📂 Article 📅 2000 🏛 Elsevier Science 🌐 English ⚖ 154 KB

Temperature-programmed desorption was performed at temperatures up to 850 K on as-received fumed and precipitated silica particles. Physisorbed water molecules on both types of silica had activation energies in the range of 38-61 kJ/mol. However, the activation energies of desorption for chemisorbed