화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korea-Australia Rheology Journal, Vol.15, No.1, 9-17, March, 2003
Export Citation
Yielding behaviour of organically treated anatase TiO2 suspension
J. Guo, C. Tiu†, P. H. T. Uhlherr, and T.-N. Fang1
  • Department of Chemical Engineering, Monash University Clayton, Victoria 3800, Australia
  • 1Department of Chemical Engineering, East China University of Science and Technology, Shanghai, China
E-mail:
The rheological behaviour of anatase TiO2 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 ponit (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 types 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.
Keywords:titanium dioxide;yield stress;suspension;pH
  1. Barnes HA, Walters K, Rheol. Acta, 24, 323 (1985) 
  2. Barnes HA, J. Non-Newton. Fluid Mech., 81(1-2), 133 (1999) 
  3. Barnes HA, Appl. Rheol., 9, 262 (1999)
  4. Cheever GD, Bobalek EG, Ind. Eng. F., 3, 89 (1964) 
  5. Cheng DCH, Rheol. Acta, 25, 542 (1986) 
  6. DeKee D, Chhabra RP, Rheol. Acta, 33(3), 238 (1994) 
  7. Derjaguin B, Landau L, Acta Physiochem. URSS, 14, 633 (1941)
  8. Evans ID, J. Rheol., 36, 1313 (1992) 
  9. Firth BA, Hunter RJ, J. Colloid Interface Sci., 57, 266 (1976) 
  10. Firth BA, J. Colloid Interface Sci., 57, 257 (1976) 
  11. Gustafsson J, Nordenswan E, Rosenholm JB, J. Colloid Interface Sci., 242(1), 82 (2001) 
  12. Hartnett JP, Hu RYZ, J. Rheol., 33, 671 (1989) 
  13. Heijman SG, Stein HN, Chem. Eng. Sci., 48, 313 (1993) 
  14. Houwink R, deDecker HK, Elasticity, Plasticity and Structure of Matter, Thrid Edition, Cambridge University Press, London (1971)
  15. Hunter RJ, Nicol SK, J. Colloid Interface Sci., 28, 250 (1968) 
  16. Johnson SB, Russell AS, Scales PJ, Colloids Surf. A: Physicochem. Eng. Asp., 141, 119 (1998) 
  17. Kapur PC, Scales PJ, Boger DV, Healy TW, AIChE J., 43(5), 1171 (1997) 
  18. Kosmulski M, Gustafsson J, Rosenholm JB, J. Colloid Interface Sci., 209(1), 200 (1999) 
  19. Kraynik AM, Comments on ER Fluid Rheology, Proc. 2nd International Conference on ER Fluids, Proc. 2nd International Conference on ER Fluids Lancaster, PA, U.S.A. (1990)
  20. Leong YK, Scales PJ, Healey TW, Boger DV, J. Am. Ceram. Soc., 78, 2209 (1995) 
  21. Liddell PV, Ph.D. Thesis, University of Melbourne, Australia (1996)
  22. Liddell PV, Boger DV, J. Non-Newton. Fluid Mech., 63(2-3), 235 (1996) 
  23. Mikulasek P, Wakemarn RJ, Marchant JQ, Chem. Eng. J., 67, 97 (1997) 
  24. Nguyen QD, Boger DV, J. Rheol., 29, 335 (1985) 
  25. Quemada D, Models for Rheological Behaviour of Concentrated Disperse Media Under Shear, Proc. IX Intl. Congress on Rheology 571-582, Mexico City, Mexico (1984)
  26. Scales PJ, Johnson SB, Healy TW, Kapur PC, AIChE J., 44(3), 538 (1998) 
  27. Schurz J, Rheol. Acta, 29, 170 (1990) 
  28. Spaans RD, Williams MC, J. Rheol., 39(1), 241 (1995) 
  29. Strauss H, Heegn H, Strienitz I, Chem. Eng. Sci., 48, 323 (1993) 
  30. Thomas DG, AIChE J., 7, 431 (1961) 
  31. Toorman EA, Rheol. Acta, 36(1), 56 (1997) 
  32. Uhlherr PHT, Zhang XM, Guo J, Zhou JZQ, Tiu C, The Shear-Induced Solid-Liquid Transition in Polymer Gels and Concentrated Suspensions, 3rd Pacific Rim Conference on Rheology, Vancouver, Canada (2001)
  33. Verwey EJW, Overbeek JG, Theory of Stability of Lyophobic Colloids, Elsevier, Amsterdam (1948)
  34. Wildemuth CR, Williams MC, Rheol. Acta, 24, 75 (1985) 
  35. Yang HG, Li CZ, Gu HC, Fang TN, J. Colloid Interface Sci., 236(1), 96 (2001) 
  36. Zhou Z, Solomon MJ, Scales PJ, Boger DV, J. Rheol., 43, 651 (1999) 
  37. Zhou JZQ, Fang T, Luo GH, Uhlherr PHT, Rheol. Acta, 34(6), 544 (1995)