RHEOLOGICAL CONSEQUENCES OF MICROSTRUCTURAL TRANSITIONS IN COLLOIDAL CRYSTALS

被引:134
作者
CHEN, LB
ACKERSON, BJ
ZUKOSKI, CF
机构
[1] UNIV ILLINOIS,BECKMAN INST,URBANA,IL 61801
[2] OKLAHOMA STATE UNIV,DEPT PHYS,STILLWATER,OK 74078
关键词
D O I
10.1122/1.550498
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
The flow properties of a suspension of 146 nm diameter charge, stabilized particles at a volume fraction of 0.33 are detailed, and links are made with small-angle neutron scattering structure determinations. At rest the suspension is ordered, having hexagonally close-packed planes lying parallel to the rheometer wall that show weak registration in the shear gradient direction. The suspension shows a distinct dynamic yield stress and two regions in which the stress is a decreasing function of shear rate. Between these regions, the suspension sustains steady-state deformation with a time-averaged microstructure consisting of a strained crystal in which the hexagonally close-packed layers remain intact. In the second stress minimum, the suspension microstructure is polycrystalline, while at higher stresses a sliding-layer microstructure is observed. Metastable viscosities (shear rates) occur in constant-stress experiments in the regions near the local stress maxima. Neither shear melting nor shear thickening was observed at shear rates up to 1.1 X 10(4) s-1.
引用
收藏
页码:193 / 216
页数:24
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