Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 2, Issue 4, Pages 965-968Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am1000745
Keywords
electrorheology; POSS; rheology; dielectric; suspension; nanoparticles
Funding
- National Science Foundation
- University of Michigan
- Alliance for Graduate Education
- Professoriate Postdoctoral Fellows program
- DOE [DE-FG02-07ER46412]
- U.S. Department of Energy (DOE) [DE-FG02-07ER46412] Funding Source: U.S. Department of Energy (DOE)
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It is shown, for the first time, that mixtures of sulfonated polyhedral silsesquioxane cage structures (sPOSS) and poly(dimethyl siloxane) (PDMS) with silicone oil exhibit significant electrorheological (ER) activity. At low sPOSS concentrations, less than 10 wt %, the viscosity is enhanced by similar to 100, which is comparable to the viscosity enhancements exhibited by conventional ER fluids, under the influence of comparable applied electric fields, E = 2 kV/mm. Measurements of the shear stress, a, dependencies on E, the conductivities, and relative permittivities reveal that the properties of these POSS/PDMS systems cannot be reconciled with theory developed to explain the behavior of conventional ER fluids.
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