文化大學機構典藏 CCUR:Item 987654321/2920
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    題名: Rheology and colloidal structure of aqueous TiO2 nanoparticle suspensions
    作者: Tseng WJ
    Lin KC
    貢獻者: 材料所
    關鍵詞: TiO2
    nanoparticle
    anatase
    rheology
    aggregation
    fractal structure
    日期: 2003
    上傳時間: 2009-11-30 11:52:17 (UTC+8)
    摘要: Rheological behavior and suspension structure of anatase titanium dioxide (TiO2) nanoparticles dispersed in pure water have been investigated over a range of volumetric solids concentrations (phi = 0.05-0.12) and shear rates (gamma = 10(1)-10(3) s(-1)). The nanoparticle suspensions generally exhibited a pseudoplastic, flow behavior, indicating an existence of particle aggregations in the liquid medium. The suspensions became apparently thixotropic as phi was increased above 0.1. Relative viscosity (eta(r)) of the suspensions followed an exponential form with phi, i.e., eta(r) = 13.47e(35.98)phi, revealing a pronounced increase in the degree of particle interactions as phi increased. Fractal dimension (D-f) was estimated from the suspension yield-stress (tau(gamma)) and phi dependence, and was determined as D-f similar to 1.46-1.78 for the flocculated nanoparticle suspensions. This suggested that the suspension structure was probably dominated by the diffusion-limited cluster-cluster aggregation, due mostly to the strong attractions involved in the interparticle potentials. Maximum solids loading (phi(m)) of the suspensions was determined as phi(m) = 0.146. This relatively low value of phi(m) (compared with the random close packing of monosized particles, phi(m) similar to 0.64) partially vindicated the existence of a porous, three-dimensional aggregate network of interconnected nanoparticles in the carrier liquid. (C) 2003 Elsevier Science B.V. All rights reserved.
    關聯: MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING Volume: 355 Issue: 1-2 Pages: 186-192
    顯示於類別:[化學工程與材料工程學系暨碩士班] 期刊論文

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