title: Concentration dependence of yield stress and dynamic moduli of kaolinite suspensions.
abstract: The concentration dependence of yield stress and dynamic moduli of kaolinite suspensions is studied. Complex electrostatic interactions between kaolinite platelets promote a more liquid-like behavior, with clay particles changing from attractive interactions to a face-face repulsive interaction as the mass fraction of clay particles increases. A yield stress model is developed based on the repulsive interaction between disk-shaped particles, which yields a good prediction of experimental observations when repulsive face-face interaction is dominant. The critical concentration when attractive interaction changes completely to face-face repulsive interaction is estimated from the theory. Four regions are identified in the variation of yield stress as a function of the concentration.
authors: †Department of Mechanical Engineering, National University of Singapore, Singapore 117576.|‡NUS-Keppel Corporate Laboratory, National University of Singapore, Singapore 117576.
authors: Yuan
authors: Y
authors: Lin
authors: †Department of Mechanical Engineering, National University of Singapore, Singapore 117576.|‡NUS-Keppel Corporate Laboratory, National University of Singapore, Singapore 117576.
authors: Nhan
authors: N
authors: Phan-Thien
authors: †Department of Mechanical Engineering, National University of Singapore, Singapore 117576.
authors: Jason Boon Ping
authors: JB
authors: Lee
authors: †Department of Mechanical Engineering, National University of Singapore, Singapore 117576.|‡NUS-Keppel Corporate Laboratory, National University of Singapore, Singapore 117576.
authors: Boo Cheong
authors: BC
authors: Khoo