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Thermal pretreatment of silica composite filler materials

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Abstract

Three different silica filler materials were thermally treated in order to effect dehydration, dehydroxylation, and rehydroxylation. Samples were characterized by thermogravimetry (TG), pycnometry, elemental analysis, and scanning electron microscopy (SEM). For all fillers, our results indicate incremental removal of silanol groups at higher heating temperatures and irreversible dehydroxylation at over 673 K. To remove the organic content and maintain adequate silanol density for subsequent silanization on Stöber-type silica, we suggest heating at 673 K followed by overnight boiling in water.

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Notes

  1. Our personal communication with the material suppliers indicated that alfa aesar-05 was synthesized by Stöber process and nalco-2329 was prepared through the sodium silicate route.

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Acknowledgements

Support from NIH R21DE018330 is appreciated. We thank Esstech and Nalco for providing materials.

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  1. Center for Bioengineering and Biomaterials, College of Engineering, Temple University, 1947N, 12th Street, Philadelphia, PA, 19122, USA

    Quan Wan, Christopher Ramsey & George Baran

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  1. Quan Wan
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  2. Christopher Ramsey
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  3. George Baran
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Correspondence to George Baran.

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Wan, Q., Ramsey, C. & Baran, G. Thermal pretreatment of silica composite filler materials. J Therm Anal Calorim 99, 237–243 (2010). https://doi.org/10.1007/s10973-009-0139-8

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