Core-shell metal oxide/titanium oxide compound electrorheological fluid and preparation method thereof

An electrorheological fluid and oxide technology, applied in lubricating compositions, petroleum industry, additives, etc., can solve the problems of wide particle size distribution, insufficient anti-settling resistance, high yield stress, etc., and achieve low zero field strength and high field strength High strength and good performance

Active Publication Date: 2012-10-10
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The Chinese patent with the publication number CN 101993760A discloses a titanyl electrorheological fluid, the dispersed phase is spindle-shaped titanyl particles, and the titanyl particles are added dropwise to a hydroalcoholic solution of anhydrous calcium chloride with oxalic acid and The electrorheological fluid prepared by this method has high electrorheological efficiency, but its anti-settling property is not enough
[0007] The Chinese patent with the publication number CN 101575544B discloses a modified calcium titanyl oxalate elect...

Method used

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  • Core-shell metal oxide/titanium oxide compound electrorheological fluid and preparation method thereof
  • Core-shell metal oxide/titanium oxide compound electrorheological fluid and preparation method thereof
  • Core-shell metal oxide/titanium oxide compound electrorheological fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Take by weighing 1.2g of iron oxide particles with a width of 30-40nm and a length of 500-700nm;

[0041] (2) Disperse iron oxide particles in 200mL sodium hydroxide aqueous solution (pH=10), add 1.1g polydiallyldimethylammonium chloride (PDDA) and stir for 1 hour, then wash and centrifuge out the iron oxide particles. iron particles;

[0042] (3) Dissolve 1.6 g of butyl titanate in a mixed solvent of 50 mL of acetonitrile / ethanol (volume ratio 1:3), and stir while adding dropwise until solution A is formed;

[0043] (4) Disperse the iron oxide particles treated in step 2 in a mixed solvent of 300 mL of acetonitrile / ethanol / water (volume ratio 1:3:0.04), then add solution A, age the resulting precipitate for 3 hours and then wash , centrifugation, and drying to obtain core-shell iron oxide / titanium oxide composite particles (TEM photo as figure 1 As shown, the EDS spectrum as figure 2 As shown, the IR spectrum as image 3 shown);

[0044] (5) Uniformly dispers...

Embodiment 2

[0046] (1) Weigh 1.0g of titanium oxide particles with a width of 18-22nm and a length of 60-90nm;

[0047] (2) Disperse the titanium oxide particles in 200 mL of ammonia solution (pH=8), add 1.4 g of hydroxypropyl cellulose (HPC) and stir for 1 hour, then wash and centrifuge out the titanium oxide particles;

[0048] (3) Dissolve 2.2 g of ethyl titanate in a mixed solvent of 60 mL of acetonitrile / ethanol (volume ratio 1:4), and stir while adding dropwise until solution A is formed;

[0049] (4) Disperse the titanium oxide particles treated in step 2 in a mixed solvent of 360 mL of acetonitrile / ethanol / water (volume ratio 1:4:0.08), then add solution A, age the resulting precipitate for 5 hours and then wash , centrifuging, and drying to obtain core-shell titanium oxide / titanium oxide composite particles;

[0050] (5) Uniformly disperse the core-shell titanium oxide / titanium oxide composite particles obtained in step 4 in methyl silicone oil (mass fraction 52%) to obtain a co...

Embodiment 3

[0052] (1) Weigh 1.5g of zinc oxide particles with a width of 450-600nm and a length of 2.5-3.5 μm;

[0053] (2) Disperse zinc oxide particles in 200mL potassium hydroxide aqueous solution (pH=11), add 1.0g polydiallyldimethylammonium chloride (PDDA) and stir for 1 hour, then wash and filter out zinc oxide particles;

[0054] (3) Dissolve 1.2 g of titanium sulfate in a mixed solvent of 50 mL of acetonitrile / ethanol (volume ratio 1:1), and stir while adding dropwise until solution A is formed;

[0055] (4) Disperse the zinc oxide particles treated in step 2 in a mixed solvent of 300mL acetonitrile / ethanol / water (volume ratio 1:1:0), then add solution A, age the resulting precipitate for 3 hours and wash , centrifuging, and drying to obtain core-shell type zinc oxide / titanium oxide composite particles;

[0056] (5) Uniformly disperse the core-shell type zinc oxide / titanium oxide composite particles obtained in step 4 in hydraulic oil (mass fraction: 60%) to obtain core-shell t...

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Abstract

The invention discloses a core-shell metal oxide/titanium oxide compound electrorheological fluid and a preparation method thereof. A non-spherical metal oxide is taken as a core, a titanium oxide polar molecular layer is coated, and the metal oxide and titanium oxide coact with each other, so that the electrorheological performance of a compound material is enhanced; the obtained compound material has an anisotropic nanostructure; and the obtained electrorheological fluid has the advantages of low zero field strength, high high-field strength and high suspension stability.

Description

technical field [0001] The invention relates to the field of electrorheological fluid, in particular to a core-shell nanocomposite electrorheological fluid and a preparation method thereof. Background technique [0002] Electrorheological fluid is a suspension composed of polarizable dielectric particles (dispersed phase) and insulating liquid (dispersed medium or continuous phase). After the electric field is applied, the equivalent viscosity of the electrorheological fluid increases significantly or even turns into a solid-like fluid, and exhibits the mechanical properties of a non-Newtonian fluid; and after the electric field is removed, the electrorheological fluid returns to a liquid state within milliseconds. Due to the prominent feature that the rheological properties can be adjusted, electrorheological fluids show greater advantages in mechatronics, automatic control, etc. than existing technologies, and can be applied to shock absorbers, clutches, brakes, and damper...

Claims

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Application Information

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IPC IPC(8): C10M125/10C10M171/00C10M177/00C10N30/06
Inventor 程昱川许高杰郭建军孙爱华王彪吴敬华
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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