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Polar-molecule type electro-rheological fluid and preparation method thereof

An electrorheological fluid, molecular technology, applied in the petroleum industry, base materials, additives, etc., can solve the problems of lack of explanation, unclear understanding of the origin of high yield stress of electrorheological fluid materials, etc.

Inactive Publication Date: 2009-11-04
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, the origin of the high yield stress of this new type of electrorheological fluid material was unclear and lacked a reasonable explanation

Method used

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  • Polar-molecule type electro-rheological fluid and preparation method thereof
  • Polar-molecule type electro-rheological fluid and preparation method thereof
  • Polar-molecule type electro-rheological fluid and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] 25g LaCl 3 ·7H 2 O, 23ml Ti(OC 4 h 9 ) 4 Dissolve in 400ml of absolute ethanol to prepare solution A; dissolve 13g of oxalic acid dihydrate in a mixture of 200ml deionized water and 200ml of absolute ethanol to prepare solution B. Add solution A to solution B at 40-65°C with ultrasound or strong stirring to obtain a white precipitate, wash and filter the precipitate with deionized water, and dry at 50-150°C to remove traces of water , to obtain white carbonyl-containing LaTiO(C 2 o 4 ) 1.5 Granules (LTO Granules). Its particle shape is as figure 1 As shown in a, the LTO particles are irregular in shape, and the particle size is about 100 nm.

[0030]The prepared LTO particles with a viscosity of 10mm 2 The simethicone oil per s is fully mixed evenly, and the volume percentage of particles is 40%. The relationship between the static yield stress and current density and the applied DC electric field is as follows figure 2 (a) and 2(b). When the applied DC ele...

Embodiment 2

[0032] 2.22gLiCl·H 2 O, 13.6g LaCl 3 ·7H 2 O, 25ml Ti(OC 4 h 9 ) 4 Dissolve in 300ml of absolute ethanol to prepare solution A; dissolve 16.67g of oxalic acid dihydrate in a mixture of 200ml deionized water and 200ml of absolute ethanol to prepare solution B. Add solution A to solution B at 40-65°C with ultrasound or strong stirring to obtain a white precipitate, age the precipitate in a water bath at 40-65°C for 3 hours, wash and filter with deionized water, and Dry at 50-150°C to remove traces of water to obtain white carbonyl-containing Li 0.5 La 0.5 TiO(C 2 o 4 ) 1.8 (LLTO) particles. Its particle shape is as figure 1 As shown in b, the LLTO particles are in the shape of a class, and some particles are agglomerated, and the particle size is about 50 nm.

[0033] The prepared LLTO particles with a viscosity of 200mm 2 The simethicone oil per s is fully mixed evenly, and the volume percentage of particles is 40%. The relationship between the static yield stress ...

Embodiment 3

[0035] 30ml Ti(OC 4 h 9 ) 4 Dissolve in 200ml of absolute ethanol to obtain solution A, and place it in an ice-water bath for later use; dissolve 22.2g of oxalic acid dihydrate in a mixture of 200ml of absolute ethanol and 250ml of deionized water to make solution B; 23.5g of SrCl 2 ·6H 2 O was mixed with 60ml deionized water to make solution C. After the three solutions were fully stirred, 6ml of hydrochloric acid was added to solution C, and poured into solution A, fully stirred in an ice-water bath until the mixture was uniform, and clear light yellow solution D was obtained. Heat solution B to 60°C, drop solution D into solution B, and keep constant temperature during the titration reaction. After the titration, the resulting suspension was aged in a water bath at 40 °C for 3 h. Wash and centrifuge with deionized water, dry at 50-150°C, remove trace water, and obtain white carbonyl-containing SrTiO(C 2 o 4 ) 2 (STO) particles. The morphology of STO particles is as...

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Abstract

The invention relates to preparation of a polar-molecule type electro-rheological fluid, in particular to polar carbonyl (C=O) containing dielectric particles prepared by an oxalate co-precipitation method. The size of the particles is between 5 and 5000 nm. The carbonyl containing dielectric particles are taken as a disperse phase, and insulating hydrophobic liquid of which the electrical conductivity is lower than 10 S / m and the dielectric constant is lower than 10 is taken as a dispersion medium. The electro-rheological fluid prepared by the method has the advantages of high shear / yield stress (static yield stress is about 100 kPa), small leakage current, good settling resistance and the like.

Description

technical field [0001] The invention relates to a polar molecular electrorheological fluid, in particular to a polar molecular electrorheological fluid containing a carbonyl group (C=O) and a preparation method thereof. Background technique [0002] Electrorheological fluid is a new type of intelligent functional material, which is a complex fluid mixed with dielectric particles and insulating liquid. In the absence of an external electric field, the electrorheological fluid is in a liquid state. When an external electric field acts on the electrorheological fluid, the shear stress of the electrorheological fluid increases with the increase of the electric field. When the electric field is large enough, the electrorheological fluid transforms into a solid-like substance. And this shear stress transformation is reversible, and the response time is on the order of milliseconds. Obviously, the unique properties of continuous adjustable shear stress, fast response and reversib...

Claims

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Application Information

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IPC IPC(8): C10M171/06C10M139/00C10M107/50C10N40/14
Inventor 沈容陆坤权路阳王学昭
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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