Unlock instant, AI-driven research and patent intelligence for your innovation.

Graphene oxide/barium titanyl oxalate composite electrorheological liquid and preparation method thereof

A technology of barium titanyl oxalate and compound current, applied in the petroleum industry, lubricating compositions, additives, etc., can solve the problems of limited practical application, easy decomposition of rheological fluid, low shear stress of rheological fluid, etc. Settling properties, high yield stress values, and the effects of cheap raw materials

Active Publication Date: 2016-10-12
UNIV OF SCI & TECH BEIJING
View PDF3 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional electrorheological fluid designed and prepared according to the theory of dielectric polarization has low shear stress, which is difficult to meet the requirements of practical industrial applications.
In 2003, Wen Weijia and others discovered for the first time that the suspension of barium titanyl oxalate (BTO) nanoparticles coated with urea as a dielectric particle and an insulating liquid can produce a giant electrorheological effect, and the shear stress is increased several times, solving the long-term problem. The historical problem of low shear stress of electrorheological fluids, but the disadvantage of easy decomposition of small polar urea molecules makes rheological fluids very unstable, which limits the practical application of such giant electrorheological fluids

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Graphene oxide/barium titanyl oxalate composite electrorheological liquid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] (1) Tetrabutyl titanate and absolute ethanol are formulated into solution A at 0.1mol / L, and dilute hydrochloric acid is added to adjust the pH value to 1. Adjust the pH value to 1 (3) barium chloride and deionized water at 0.1mol / L to make solution C, add dilute hydrochloric acid to adjust the pH value to 1 (4) tetraethyl silicate and absolute ethanol at a volume ratio of 0.1 Form solution D (5) Take 200ml of solution D and add graphene oxide provided by Beijing 602, sheet-like, thickness 80-150nm, irregular shape, maximum size 30um, adjust the pH value to 9 with dilute ammonia water, and make a suspension Liquid E (6) After A solution and B solution are mixed uniformly at a volume ratio of 1:2, add suspension E, the above three solutions A:B:E=1:2:1, add dropwise according to the above three solution ratios C solution forms a gray precipitate, the volume ratio of each solution is A:B:C:E=1:2:1:1, after magnetic heating and stirring at 65°C for 1h, suction filtration w...

Embodiment 2

[0013] (1) Tetrabutyl titanate and absolute ethanol are formulated into solution A at 0.1mol / L, and dilute hydrochloric acid is added to adjust the pH value to 1. Adjust the pH value to 1(3) barium chloride and deionized water at 0.1mol / L to make solution C, add dilute hydrochloric acid to adjust the pH value to 1(4) 100ml of absolute ethanol, add 1g of graphene oxide provided by Beijing 602 , lamellar, thickness 80-150nm, irregular shape, maximum size 30um, made into suspension D (5) A solution and B solution are mixed uniformly at a volume ratio of 1:2, then add suspension D, the above three solutions A:B:D=1:2:1, add C solution dropwise according to the ratio of the above three solutions to form a gray precipitate, the volume ratio of each solution is A:B:C:D=1:2:1:1, in After magnetic heating and stirring at 65°C for 1 hour, suction filtration with common filter paper, repeated washing and suction filtration, and low vacuum drying at 80°C for 24 hours to obtain gray nanopa...

Embodiment 3

[0015] (1) Tetrabutyl titanate and absolute ethanol are formulated into solution A at 0.1mol / L, and dilute hydrochloric acid is added to adjust the pH value to 1. Adjust the pH value to 1(3) barium chloride and deionized water at 0.1mol / L to make solution C, add dilute hydrochloric acid to adjust the pH value to 1(4) 100ml of absolute ethanol, add 1g of graphene oxide provided by Beijing 602 , lamellar, thickness 80-150nm, irregular shape, maximum size 30um, made suspension D (5) A solution and B solution were mixed uniformly at a volume ratio of 1:2, then added to solution C drop by drop, the above three Solution A:B:C=1:2:1, a white precipitate is formed, and the reaction is completely carried out, then adding suspension D, the volume ratio of each solution is A:B:C:D=1:2:1:1, in After magnetic heating and stirring at 65°C for 1 hour, suction filtration with ordinary filter paper, repeated washing and suction filtration, and low vacuum drying at 80°C for 24 hours to obtain w...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Yield stress valueaaaaaaaaaa
Login to View More

Abstract

The invention discloses an electrorheological liquid with graphene oxide / barium titanyl oxalate composite nanoparticles as dielectric particles and a preparation method thereof, and belongs to the technical field of electrorheological liquid material in intelligent materials. A dielectric particle dispersion phase is graphene oxide / barium titanyl oxalate composite particles and is prepared by a chemical precipitation method. The thickness of barium titanyl oxalate is 1-5 [mu]m, and the thickness of the graphene oxide layer is 80-150 nm, and a continuous phase in the electrorheological liquid is polydimethyl silicone oil. The electrorheological liquid is prepared from the dielectric particles and the continuous phase with the mass ratio of 4:1, and relatively high rheological property can be obtained, that is to say, in the 3 kV / mm electric field gradient, the yield stress of the electrorheological liquid is increased by 3 times; and the electrorheological liquid has a good anti-settling performance.

Description

technical field [0001] The invention belongs to the technical field of electrorheological materials, and also belongs to the technical field of intelligent materials, and specifically relates to electrorheological fluid in which the compound material obtained after modifying the surface of olefin oxide with barium titanyl oxalate is a dispersed phase. Background technique [0002] Electrorheological fluid is a kind of intelligent fluid composed of micro-nano dielectric particles dispersed in insulating liquid. Its rheological properties such as shear stress can rapidly and reversibly change by several orders of magnitude under the action of an external electric field. This unique characteristic makes electrorheological fluids have broad application prospects in electromechanical conversion devices such as shock absorbers, clutches, and control valves. However, traditional electrorheological fluids designed and prepared according to the theory of dielectric polarization have ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C10M161/00C10N40/14
CPCC10M125/02C10M129/34C10M155/02C10M161/00C10N2030/60C10N2040/14
Inventor 郭志猛李琴隋延力吴成义杨薇薇韩强杨芳张欣悦张晓冬吴立成
Owner UNIV OF SCI & TECH BEIJING