Giant electrorheological fluid surfactant additives

Patent metadata

Field	Value
Publication number	US-10190068-B2
Application number	US-201514590533-A
Country	US
Kind code	B2
Filing date	Jan 6, 2015
Priority date	Jan 10, 2014
Publication date	Jan 29, 2019
Grant date	Jan 29, 2019

Abstract

GER fluids are improved by the addition of a polar molecule additive. By addition of a polar molecule additive, yield stresses under electric field are improved by over 50% while the current density is reduced to less than a quarter of the original GER. The reversible response time still remains the same, and the sedimentation stability is greatly enhanced. The zero field viscosity of the modified GER fluid remains the same as that of the original GER fluid without the additive. The improved GER characteristics improve general functionality as an electrical-mechanical interface, attendant with applications to car clutches, fluid brakes, and vehicle shock absorbers.

First claim

What is claimed is:

1. A method for preparing giant electrorheological (GER) fluids, comprising the steps of:
grinding a nanoparticle composite comprising urea and 0.2-5.0 wt % sodium dodecylbenzenesulfate (SDBS);
agitating the ground composite via ultrasonification for at least 30 minutes at 20-40° C.;
drying the composite for at least 12 hours in a freeze drying machine; and
suspending the composite in a non-conducting oil.

2. The method for improving GER fluids of claim 1 , wherein the weight fraction of SDBS to GER fluid is from about 0.1 to about 1 w %.

3. A method for preparing giant electrorheological (GER) fluids comprising:
preparing urea-coated metal salt nanoparticles;
grinding a composite consisting of the urea-coated metal salt nanoparticles and 0.2-5.0 wt % sodium dodecylbenzenesulthte (SDBS);
agitating the ground composite via ultrasonification for at least 30 minutes at 20-40° C.;
drying the agitated composite for at least 12 hours in a freeze drying machine; and
suspending the agitated, ground composite in a non-conducting oil.

Assignees

• Univ Hong Kong Sci & Tech

Inventors

• Sheng Ping
• Liao Maijia
• Wen Weijia
• Hong Ya Ying

Classifications

• C10M2219/042

  Sulfate esters · CPC title

• C10M2215/042

  containing hydroxy groups; Alkoxylated derivatives thereof · CPC title

• C10N2030/02

  Pour-point; Viscosity index · CPC title

• C10M2207/401

  used as base material · CPC title

• C10M2209/109

  esterified · CPC title