Bar-shaped perovskite deposited compound giant electrorheological fluid and preparation method thereof

A technology of giant electrorheological fluid and compound, which is applied in the directions of lubricating composition, petroleum industry, base material, etc., can solve the problems that electrorheological fluid is not widely used and the yield strength of electrorheological fluid is low, and achieves a short preparation period, Easy operation, high yield stress effect

Active Publication Date: 2009-09-16
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The yield strength of traditional electrorheological fluids is low. According to the prediction of dielectric theory, the upper limit of its yield strength is about 10kPa, which is far less than the requirements of engineering applications (greater than 30kPa). Therefore, electrorheological fluids have not been obtained for more than half a century. universal application

Method used

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  • Bar-shaped perovskite deposited compound giant electrorheological fluid and preparation method thereof
  • Bar-shaped perovskite deposited compound giant electrorheological fluid and preparation method thereof
  • Bar-shaped perovskite deposited compound giant electrorheological fluid and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Dissolve 0.054mol oxalic acid in 100ml ethanol / water (1:1 volume ratio) mixed solvent, then add 0.021mol titanium tetrabromide dropwise, stir while adding dropwise until a transparent solution a is formed, adjust the solution with dilute ammonia water pH=3~4.

[0029] Dissolve 0.022mol of calcium chloride in a mixed solution of 100ml of ethanol / water (7:1 by volume) containing 0.033mol of citric acid, and then add 0.0005mol of PEG20000 to obtain solution b after dissolution.

[0030] At room temperature, add solution b dropwise to solution a while stirring, and gradually form a milky white precipitate. After the reaction is complete, age the formed precipitate at 50°C for 5 hours; wash and centrifuge the aged precipitate, and release the product Dry in a vacuum oven at 50-60°C for 24 hours, and then dry at 110°C under normal pressure for 6 hours to obtain rod-shaped calcium titanium precipitation composite nanoparticles. The scanning electron microscope photos are shown...

Embodiment 2

[0032] Dissolve 0.062mol oxalic acid in 200ml ethanol / water (volume ratio: 3:1) mixed solvent, then add dropwise 0.025mol tetrabutyl titanate, stir while adding dropwise until a transparent solution a is formed, adjust with dilute ammonia water Solution pH=3-4.

[0033] Dissolve 0.026mol calcium chloride hexahydrate in 50ml water to obtain solution b.

[0034] At 40°C, add solution b dropwise to solution a while stirring, and gradually form a milky white precipitate. After the reaction is complete, age the formed precipitate at 40°C for 12 hours; wash and centrifuge the aged precipitate to obtain the product Dry in a vacuum oven at 50-60°C for 24 hours, and then dry at 120°C under normal pressure for 4 hours to obtain rod-shaped calcium titanium precipitation composite nanoparticles. The scanning electron microscope photo is shown in figure 1 (c). Evenly mix the obtained nanoparticles with methyl silicone oil dried at 120°C for 2 hours, that is, the electrorheological fluid ...

Embodiment 3

[0036] Dissolve 0.054mol oxalic acid in 100ml ethanol / water (1:1 volume ratio) mixed solvent, then add 0.021mol tetrapropyl titanate dropwise, stir while adding dropwise until a transparent solution a is formed, adjust with dilute ammonia water Solution pH=3~4;

[0037] Dissolve 0.022mol of calcium nitrate tetrahydrate in a mixed solution of 100ml of ethanol / water (volume ratio 7:1) containing 0.033mol of citric acid, and then add 0.0006mol of PEG100000 to obtain solution b after dissolution.

[0038]At 60°C, add solution b dropwise to solution a while stirring, and gradually form a milky white precipitate. After the reaction is complete, age the formed precipitate at room temperature for 5 hours; wash and centrifuge the aged precipitate, and release the product Dry in a vacuum oven at 50-60°C for 24 hours, and then dry at 110°C under normal pressure for 6 hours to obtain rod-shaped calcium titanium precipitation composite nanoparticles. The scanning electron microscope photos...

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Abstract

The invention relates to a bar-shaped perovskite deposited compound giant electrorheological fluid and preparation method thereof, including a continuous phase using a liquid insulating medium and a disperse phase dispersed therein. The invention is characterized in that the disperse phase is nanometer bar-shaped perovskite deposited compound particles, and the mass concentration of the disperse phase is 10% to 75%. The preparation method is as follows: the bar-shaped perovskite deposited compound particles are firstly synthesized by coprecipitation method, and then mixed with the liquid insulating medium with low specific inductive capacity uniformly so that the perovskite compound giant electrorheological fluid is prepared. Compared with the existing technology, the perovskite compound giant electrorheological fluid provided by the invention has simple preparation method, easy operation, low material cost and short preparation period, and the obtained giant electrorheological fluid has the advantages of low initial viscosity, great stress yield, low leakage current density, and the like.

Description

technical field [0001] The invention relates to an electrorheological fluid and a preparation method thereof, in particular to a rod-shaped perovskite precipitation complex electrorheological fluid and a preparation method thereof. Background technique [0002] Electrorheological fluid is a suspension system formed by dispersing polarizable solid particles in an insulating liquid. Under the action of an electric field, the electrorheological fluid has the characteristics of continuously adjustable shear strength (elastic modulus or rheological properties), fast response (ms level) and reversible transformation, which makes it the best fluid with adjustable hardness. Smart materials show greater advantages than existing technologies in terms of mechatronics and automatic control. Electrorheological fluids can be used to manufacture damping systems, shock and noise reduction systems, braking systems, displays, liquid valves, electromechanical coupling controls, robot parts an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M125/00C10M169/04C10M107/50C10N40/16
Inventor 程昱川刘丰华郭建军刘雪辉吴开华许高杰崔平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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