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Journal of Central South University of Technology

, Volume 14, Issue 6, pp 737–741 | Cite as

Viscoelastic properties of monodisperse spherical silica suspension

  • Wu Qiu-mei  (伍秋美)
  • Ruan Jian-ming  (阮建明)Email author
  • Huang Bai-yun  (黄伯云)
  • Zhou Zhong-cheng  (周忠诚)
  • Zou Jian-peng  (邹?鹏)
Article

Abstract

The viscoelastic properties of the suspension of monodisperse spherical silica produced by hydrolysis of tetraethoxysilane in alcohol solvent with ammonia as a catalyst in polyethylene glycol (PEG) were studied. The results show that the SiO2/PEG suspension possesses the reversible shear thinning and shear thickening behaviors. In the shear thinning region, the loss modulus (G″) almost remains unchanged, whereas the storage modulus (G′) decreases. In the shear thickening region, G″ and G′ increase for the formation of the “clusters”. The larger G″ over G′ in all the stress studied shows that the system mainly possesses the viscous property, and that the energy dissipated(Ed) is larger than that stored. Ed of this suspension is proportional to the maximum strain (γmax) rising with the exponent of 1.92 under low shear stress; however, in the shear thickening region, Ed is proportional to γmax rising with the exponent of 5.00.

Key words

viscoelasticity monodisperse silica suspension shear thickening 

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Copyright information

© Published by: Central South University Press, Sole distributor outside Mainland China: Springer 2007

Authors and Affiliations

  • Wu Qiu-mei  (伍秋美)
    • 1
  • Ruan Jian-ming  (阮建明)
    • 1
    Email author
  • Huang Bai-yun  (黄伯云)
    • 1
  • Zhou Zhong-cheng  (周忠诚)
    • 1
  • Zou Jian-peng  (邹?鹏)
    • 1
  1. 1.State Key Laboratory of Powder MetallurgyCentral South UniversityChangshaChina

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