Rheological studies of aqueous stabilised nano-zirconia particle suspensions

Materials Research

Asad Ullah Khan¹  Anwar Ul Haq¹  Nasir Mahmood¹  Zulfiqar Ali¹ 

[1] ,COMSATS Institute of Information Technology Department of Chemical Engineering Lahore,Pakistan

关键词: zirconia;    rheology;    electrophoretic mobility;    suspension;   

DOI  :  10.1590/S1516-14392011005000097

来源: SciELO

【 摘 要 】

In the present investigation aqueous suspensions of nano- and colloidal range particles are stabilised by changing the ambient pH. Rheology is used to establish the stability of the suspensions and it is found that the rheology of the suspensions is strongly dependent on the pH values. The viscosity is highest close to the iso-electric point of the powders. At the iso-electric point the net surface charge on the powder particles is zero and is the cause of the high viscosity. Away from the iso-electric point, the particles are charged, giving rise to a double layer phenomenon and causing the reduction in viscosity. It is also found that increasing the solid contents of the suspensions reduces the pH region of low viscosity.

【 授权许可】

CC BY   
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