Citation: Ran Niu, Jiang Gong, Dong-hua Xu, Tao Tang, Zhao-yan Sun. The Effect of Particle Shape on the Structure and Rheological Properties of Carbon-based Particle Suspensions[J]. Chinese Journal of Polymer Science, ;2015, 33(11): 1550-1561. doi: 10.1007/s10118-015-1704-1 shu

The Effect of Particle Shape on the Structure and Rheological Properties of Carbon-based Particle Suspensions

Ran Niu ^1,2,3 ,
Jiang Gong ^1,2,3 ,
Dong-hua Xu ⁴ ,
Tao Tang ⁴ ,
Zhao-yan Sun ⁴

1.
1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
2.
2. University of Chinese Academy of Sciences, Beijing 100049, China
3.
4.
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China

Received Date: 9 April 2015
Revised Date: 22 May 2015

Fund Project: This work was financially supported by the National Natural Science Foundation of China (Nos. 21474111, 21222407 and 21274152) and subsidized by the National Basic Research Program of China (973 Program, 2012CB821500).

The structure and rheological properties of carbon-based particle suspensions, i.e., carbon black (CB), multi-wall carbon nanotube (MWNT), graphene and hollow carbon sphere (HCS) suspended in polydimethylsiloxane (PDMS), are investigated. In order to study the effect of particle shape on the structure and rheological properties of suspensions, the content of surface oxygen-containing functional groups of carbon-based particles is controlled to be similar. Original spherical-like CB (fractal filler), rod-like MWNT and sheet-like graphene form large agglomerates in PDMS, while spherical HCS particles disperse relatively well in PDMS. The dispersion state of carbon-based particles affects the critical concentration of forming a rheological percolation network. Under weak shear, negative normal stress differences (N) are observed in CB, MWNT and graphene suspensions, while N is nearly zero for HCS suspensions. It is concluded that the vorticity alignment of CB, MWNT and graphene agglomerates under shear results in the negative N. However, no obvious structural change is observed in HCS suspension under weak shear, and accordingly, the N is almost zero.
- Particle shape,
- Surface chemistry,
- Negative normal stress differences,
- Structure,
- Interactio
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