Citation: Lei Ye, Yue Xie, Dong Qiu, Ying Kan, Zheng-dong Zhang. Particle Shape Dependence of Rheological Behavior for Colloid-polymer Mixtures[J]. Chinese Journal of Polymer Science, ;2014, 32(11): 1515-1523. doi: 10.1007/s10118-014-1538-2 shu

Particle Shape Dependence of Rheological Behavior for Colloid-polymer Mixtures

Lei Ye ¹ ,
Yue Xie ¹ ,
Dong Qiu ¹ ,
Ying Kan ² ,
Zheng-dong Zhang ²

1.
Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
2.
National Institute of Metrology, Beijing 100013, China

Received Date: 15 January 2014
Revised Date: 10 March 2014

Fund Project: This work was financially supported by the Institute of Chemistry, Chinese Academy of Sciences through the Young Excellence Project, the Knowledge Innovation Program of the Chinese Academy of Sciences (No. KJCX2-YW-H19), National Natural Science Foundation of China (No. 91027032), National Key Technology RD Program of China (No. 2011BAI02B05) and State Key Development Program of Basic Research of China (No. 2012CB933200). We also thank Akzo Nobel Ltd. Taiwan for kind donating BINDZIL silica colloids.

The effect of particle shape on the rheological behavior of small particle-large polymer chain mixture solutions has been investigated with two model colloidal silica dispersions, one of which is ellipsoidal (BINDZIL20/440) and the other is spherical (TM40). It was found that BINDZIL20/440 series showed shear-thickening at lower shear rates and had a lower upper limit in PEO concentration to demonstrate shear-thickening phenomena. The particle shape was identified as the major factor accounting for these differences. This work enables one to control the rheological behavior of colloid-polymer mixture through simply changing particle geometry instead of performing surface modifications, which could be especially useful in cases where only certain chemicals are allowed, for example in vivo applications.
- Silica colloid,
- Rheology,
- Nanoparticle,
- PEO
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