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Citation: YANG Hai-Lin, RUAN Jian-Ming, WU Qiu-Mei, ZHOU Zhong-Cheng, ZOU Jian-Peng. Rheological Behaviors of SiO₂/PEG Suspension under Dynamic Shear[J]. Acta Physico-Chimica Sinica, ;2008, 24(03): 433-436. doi: 10.3866/PKU.WHXB20080314 shu

Rheological Behaviors of SiO₂/PEG Suspension under Dynamic Shear

1.
State Key Laboratory of Power Metallurgy, Central South University, Changsha 410083, P. R. China

Received Date: 10 September 2007
Available Online: 25 January 2008

Fumed silica suspensions in polyethylene glycol (PEG200) exhibited shear-thickening behavior under dynamic oscillatory strain amplitude. Two regimes of shear-thickening behavior were obtained: the first occured at critical strain amplitude γc and different constant frequencies, and the second occured at critical frequency and constant strain amplitude γ0=500%. For the first, the relationships of both of the moduli (G’ and G’’) versus strain amplitude were investigated. The strain amplitude as a function of different constant frequencies was observed. In the linear viscoelastic region, the storage (G’) and the loss (G’’)moduli depended stronglyon frequencywith the power-law: G’∝ω0.57, G’’∝ω0.7. In the second regime, the moduli (G’ and G’’) and complex viscosity η* showed strong dependence on frequency. The behaviors could be qualitatively explained using the cluster theory, which attributed the phenomena to the formation of metastable, flow induced clusters.
- Fumed silica suspensions; Shear-thickening; Storage modulus; Loss modulus; Frequency
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Rheological Behaviors of SiO₂/PEG Suspension under Dynamic Shear