ルチルコロイドによる天然ウォラストナイト繊維の表面被覆

概要

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Surface coating of natural wollastonite fiber with colloidal rutile was performed in order to produce antibacterial inorganic filters for ventilators of buildings. The wollastonite surface in suspensions was made sufficiently negative to electric charge by adding chelating reagents, such as disodium salt of the ethylenediaminetetraacetic acid(EDTA)and sodium citrate for masking Ca^<2+> which dissolves from the raw materials acting as counter ion in the electric double layer. Rutile particles with positive charge adsorbed quantitatively onto the wollastonite surface by electrostatic force of attraction at pH6. Detaching of rutile particles from the wollastonite surface during filtration and drying processes due to aggregation by large surface tension of water was avoided by replacing water by acetone. As a result, wollastonite fibers were covered with a homogeneous layer of colloidal rutile, and the rutile particles firmly adhered on the surface by heating at 500℃ for 2h.
社団法人日本セラミックス協会の論文
2000-08-01