Polar molecule dominated electrorheological fluid

Details Polar molecule dominated electrorheological fluid Polar molecule dominated electrorheological fluid

2011-07-19

2011-07-19

Ogden, Jr., Necholus (Department: 1761)

Compositions

Heat-exchange, low-freezing or pour point, or high boiling...

Organic components

C252S074000, C252S512000

Reexamination Certificate

active

07981315

ABSTRACT:
Polar molecules dominated electrorheological fluids mainly comprising a mixture of dispersed phase of solid particles and/or dispersing liquid medium. The dispersed phase solid particles, on the surface, or the liquid dispersing medium contain polar molecules or polar groups, the dipole moment of which is 0.5-10 deb and the size is between 0.1 nm and 0.8 nm. Dispersed phase solid particles are spherical or nearly spherical, of which the size is 10-300 nm and dielectric constant is higher than 50. The conductance rate of the liquid dispersing medium is lower than 10−8S/m, and the dielectric constant is lower than 10. The PM-ER fluids possess the characteristics of high yield strength, high dynamic shear strength, low leakage current, the linear dependence of yield strength on electric field, and high yield strength at low electric field, etc. The yield strength improves to almost 100 times of that of ordinary ER fluids and reaches to more than 200 Kpa.

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