electrorheological fluid

(redirected from ER fluid)

electrorheological fluid

[i¦lek·trō‚rē·ə¦läj·ə·kəl ′flü·əd]
(physical chemistry)
A colloidal suspension of finely divided particles in a carrier liquid, usually an insulating oil, whose rheological properties are changed through an increase in resistance when an electric field is applied.
References in periodicals archive ?
Fludicon is set to commercialise its ER fluid and ER dampers for production vehicles in 2010 with the introduction of its eRRide(R) semi-active suspension system.
Fludicon's research on ER fluids and dampers has generated patented designs that are highly compatible with various applications across domains such as automotive, industrial, material handling and transport, rehabilitation and exercise equipment.
Example applications include self-coupled dampers based on ER fluid and piezoelectric ceramic for vibration control, and a flexible sandwiched ER composite for sound transmission control.
An ER fluid usually consists of fine dielectric solid particles suspended in a nonconducting oil phase.
For commercial purposes, an ER fluid should also possess properties such as low off field viscosity, low current consumption, high yield stress in electric fields, and low temperature sensitivity.
Wheel and brake systems incorporating an ER fluid develop a more
The phenomenon of electrorheology has been known for about 50 years, but commercial exploitation in the form of devices was not possible due to performance limitations in ER fluids.
A hollow beam filled with ER fluid and fitted with load-monitoring sensors could respond to changes in load by changing, says, its stiffness and vibrational frequencies.
Many polyaniline derivatives have been reported based upon modification of oxidation state, dopant and polymerization conditions (10), since polyaniline has advantages over the other polymer particles as a polarizable particle for ER fluid with respect to density, conductivity control, and thermal stability.
We then characterize the structure of poly(aniline-co-o-ethoxyaniline) particles synthesized from the chemical oxidation in this study, and investigate the rheological properties of ER fluid using these synthesized poly(aniline-co-o-ethoxyaniline) particles in a silicone oil.
Researchers at the Cranfield Institute of Technology in Cranfield, England, already have announced making an ER fluid containing less than 5 percent water.
Although a number of theoretical analyses and experimental observations have been conducted, the exact mechanism of forming a chainlike structure within an ER fluid is not yet well understood.