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자료유형
학술저널
저자정보
Guo, J. (Department of Chemical Engineerig, Monash University) Tiu, C. (Department of Chemical Engineerig, Monash University) Uhlherr, P.H.T. (Department of Chemical Engineerig, Monash University) Fang, T.N. (Department of Chemical Engineering, East China University of Science and Technology, Shanghai, China)
저널정보
한국유변학회 Korea-Australia rheology journal Korea-Australia rheology journal 제15권 제1호
발행연도
2003.1
수록면
9 - 17 (9page)

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The rheological behaviour of anatase $TiO_2$ with organic coating has been investigated extensively in this study. The yield stress was measured over a wide range of solids concentration and pH using stress-controlled and speed-controlled rheometers. The organic treatment leads to a shift of the isoelectric point (IEP) from around pH 5.5 to pH 2.4. A maximum yield stress occurs in the vicinity of the isoelectric point determined by electrokinetic measurements. The transition of rheological behaviour between elastic solid and viscous liquid is represented by a stress plateau in a plot of stress against strain. It is hypothesised that the slope of the stress plateau reflects the uniformity of the structure, and hence the distribution of bond strength. Altering the concentration and the surface chemistry can vary the bond strength and its distribution. therefore, resulting in different type of failure: "ductile-type" or "brittle-type". pH and volume fraction dependence of yield stress could be described quantitatively using existing models with reasonable agreement.easonable agreement.

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