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Rheological behavior of fumed silica suspension in polyethylene glycol

  • Wu Qiu-mei Email author
  • Ruan Jian-ming 
  • Huang Bai-yun 
  • Zhou Zhong-cheng 
  • Zou Jian-peng 
Article

Abstract

The rheological behavior of fumed silica suspensions in polyethylene glycol(PEG) was studied at steady and oscillatory shear stress using AR 2000 stress controlled rheometer. The systems show reversible shear thickening behavior and the shear-thickening behavior can be explained by the clustering mechanism. The viscosity and the degree of shear-thickening of the systems strongly depend on the mass fraction of the silica, the molecular weigh of PEG and the frequency used in the rheological measurement. The silica volume fraction of the systems is 1.16%–3.62%, corresponding to the mass fraction of 4%–9%. The shear-thickening taking place in the low volume fraction may contribute to the fractal nature of the silica. At oscillatory shear stress, when the shear stress is less than the critical stress, the storage modulus decreases significantly, meanwhile the loss modulus and the complex viscosity almost remain unchanged; when the shear stress is larger than the critical stress, the storage modulus, the loss modulus and the complex viscosity increase with the increase of shear stress. The loss modulus is larger than the storage modulus in the range of stress studied and both moduli depend on frequency.

Key words

fumed silica suspension polyethylene glycol shear-thickening storage modulus loss modulus 

CLC number

O648 

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Copyright information

© Central South University 2006

Authors and Affiliations

  • Wu Qiu-mei 
    • 1
    Email author
  • Ruan Jian-ming 
    • 1
  • Huang Bai-yun 
    • 1
  • Zhou Zhong-cheng 
    • 1
  • Zou Jian-peng 
    • 1
  1. 1.State Key Laboratory of Powder MetallurgyCentral South UniversityChangshaChina

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