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Seed polymerization of tetraethyl ortho-silicate in the presence of rod-like colloidal particles of anionic palygorskite and cationic β-FeO(OH)

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Abstract

Kinetic analyses were made of the seed polymerization of tetraethyl ortho-silicate (TEOS) in the presence of rod-like colloidal particles of palygorskite and cationic β-FeO(OH) by turbidity and dynamic light-scattering measurements. Transmission electron microscopic measurements supported the formation of core-shell particles. The seed polymerization of TEOS took place exclusively on the surfaces of palygorskite. The main cause of the observation is due to the fact that the main component of palygorskite is SiO2 and the affinity between palygorskite and TEOS is high, though the electrostatic repulsion between them is not favorable for shell formation. The shell formation of silica on a β-FeO(OH) particle also proceeded. The electrostatic attraction forces between the anionic polar TEOS monomers and cationic β-FeO(OH) particles played an important role in shell formation. These results are consistent with a polymerization mechanism consisting of the formation of small preliminary particles followed by their coalescence on the surfaces of the seeds to give the final large particles coated with silica layers.

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Acknowledgments

The authors appreciate deeply Professor Dr. Maria Stoimenova for her kind provision of the palygorskite particles. The Ministry of Education, Science, Sports and Culture is thanked for Grants-in-Aid for Scientific Research on Priority Area (A) (11167241) and for Scientific Research (B) (11450367).

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Authors and Affiliations

  1. Department of Applied Chemistry and Graduate School of Materials Science, Gifu University, Yanagido 1-1, Gifu 501-1193, Japan

    Tsuneo Okubo, Takehiro Miyamoto, Atsushi Otake, Mitsuhiro Suda & Akira Tsuchida

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  1. Tsuneo Okubo
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  2. Takehiro Miyamoto
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  3. Atsushi Otake
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  4. Mitsuhiro Suda
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  5. Akira Tsuchida
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Correspondence to Tsuneo Okubo.

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Okubo, T., Miyamoto, T., Otake, A. et al. Seed polymerization of tetraethyl ortho-silicate in the presence of rod-like colloidal particles of anionic palygorskite and cationic β-FeO(OH). Colloid Polym Sci 282, 1341–1346 (2004). https://doi.org/10.1007/s00396-004-1051-1

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