Patent ID: 9129732
Filing Date: 2015-09-08
Classification: H01F

Abstract:
1. A magnetorheological fluid composition, comprising: a carrier fluid; and a nano-magnetic-responsive composite dispersed uniformly in the carrier fluid wherein the nano-magnetic-responsive composite is formed by having carbonyl iron microparticles react with a grafting agent to form modified carbonyl iron nanoparticles and blending the modified carbonyl iron nanoparticles with acid-treated graphene or carbon nanotubes, wherein the nano-magnetic-responsive composite has a nano-scaled dimension of 10˜100 nm and has a lengthwise dimension, other than the nano-scaled dimension, of 0.5˜5 μm; the acid-treated graphene or carbon nanotubes has a nano-scaled dimension of 5˜50 nm and has a lengthwise dimension, other than the nano-scaled dimension, of 0.5˜20 μm; and the modified carbonyl iron nanoparticle has an average diameter of 5˜20 nm.