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39] Percival, S. ; Walker, J. ; Hunter, P. , Biofilms Development in General. In Microbiological Aspects of Biofilms and Drinking Water, CRC Press: New York, 2000; pp 61-84. [40] Ridgway, H. ; Rodriguez, G. , Biofouling of membranes: Membrane preparation; characterization and analysis of bacterial adhesion. In Biofilms, Doyle, R. , Ed. Methods in Enzymology Academic Press: San Diego, CA, 1999; pp 463-494. [41] Sutherland, I. , Exopolysaccharides in biofilms, flocs and related structures. Water Science and Technology 2001, 43, (6), 77-86.

2. Preparation of CB Suspensions The suspensions were prepared by mechanically mixing. prescribed amount (total 50 g) of dry CB and suspending media was charged into a stainless steel cylinder of diameter 45 mm and stirred with motor-driven two flat disks of diameter 30 mm. The stirring was conducted at 500 rpm for 2 h at 60C. The rheological data of the suspensions thus prepared were reproducible and did not change with time. These reproducible/stable data coincided with the data obtained for samples prepared with a three-roller mill.

Figures 9(a), (b), (c), and (d) show the shear rate  dependence of the steady shear viscosity  of the CB-76 (a), CB-24-1 (b), CB-15-2 (c), and AcB (d) suspensions having various CB concentrations cCB. The suspending medium . (PS/DBP solution) shows a constant viscosity independent of  and exhibits a Newtonian flow. On the other hand, all the CB/(PS/DBP) suspensions are characterized by a typical shear thinning behavior. The viscosities seem to approach to a constant viscosity at high shear rate.

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