Title :
A rheo-optical and materials approach to electrorheology
Author :
Jordan, Therese C. ; Wong, Wilkey ; Shaw, Montgomery T.
Author_Institution :
Inst. of Mater. Sci., Connecticut Univ., Storrs, CT, USA
Abstract :
A technique was developed to measure simultaneously the rheological and optical response of electrorheological (ER) fluids in combined shear and electric fields. Rheo-optical results for a commercial ER fluid exhibit microstructural changes occurring upon application of an electric field that are well within the time frame of the rheological response. It is noted that additional evidence is needed to verify or refute particle fibrilation as the fundamental underlying mechanism necessary for ER activity. Novel fluids in which the dispersed particles are microcapsules with a polystyrene wall and primarily water core have been prepared. These fluids are ER-active and will be used in the future to investigate interfacial and bulk polarization modes independently
Keywords :
disperse systems; electric field effects; rheology; shear flow; two-phase flow; bulk polarization modes; combined shear and electric fields; dispersed particles; electrorheological fluids; interfacial mode; microcapsules; microstructural changes; optical response; particle fibrilation; polystyrene wall; rheological response; Erbium; Materials science and technology; Oils; Rheology; Silicon compounds; Solids; Spectroscopy; Stress; Viscosity; Windows;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena, 1988. Annual Report., Conference on
Conference_Location :
Ottawa, Ont.
DOI :
10.1109/CEIDP.1988.26378
