Relationship between structure and rheological properties of plate-like particle suspensions.
作者：Ran Niu, Jiang Gong, Donghua Xu*, Tao Tang, Zhao-Yan Sun*.
關鍵字：Plate-like particles,Structure,Rheology,Negative normal stress differences,Interactiona
論文來源：期刊
具體來源：Colloids and Surfaces A: Physicochem. Eng. Aspects 2015, 470, 22-30.
發表時間：2015年
The structures and rheological properties of three different plate-like particle suspensions, i.e.,organically-modified montmorillonite (OMMT), graphene oxide (GO) and Kaolinite (Kaolin) in siliconeoil (SO), are explored. Since the interactions between plate-like particle and SO are different, the disper-sion states of these particles in SO are different. OMMT particles disperse relatively well in SO, and smallclusters exist in GO/SO suspensions, but larger aggregates are found in Kaolin/SO suspensions. Moreover,liquid-crystalline ordering structure is found in both OMMT/SO and GO/SO suspensions, while it is absentin Kaolin/SO suspensions. Negative normal stress differences (N) are observed during shear in all threeplate-like particle suspensions, however, the mechanisms of the negative N might be different. It canbe further inferred that the negative N in OMMT/SO suspensions results from the tumbling and rotatingmotions of OMMT sheets, while for GO/SO or Kaolin/SO suspensions, the negative N results from thevorticity alignment of large GO clusters and Kaolin aggregates.