Ni/TiO2-based electromagnetic rheological liquid with electromagnetic coupling effect and preparation method thereof

An electromagnetic coupling, rheological fluid technology, applied in lubricating compositions, petroleum industry, etc., can solve the problems of large proportion of metal core-shell dispersed phase particles, poor anti-settling resistance of electro-rheological fluid, low electro-rheological strength, etc., to improve electrical conductivity. , The effect of improving shear strength and improving performance

Inactive Publication Date: 2011-02-09
NO 52 INST OF CHINA NORTH IND GRP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, despite the emergence of various core-shell particle electrorheological fluid materials in recent years, their electrorheological strength is still far below its theoretical value. important factor in performance
At the same time, due to the large specific gravity of the metal core-shell dispersed phase particles, it is easy to precipitate, so that the electrorheological fluid has poor anti-sedimentation resistance.

Method used

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  • Ni/TiO2-based electromagnetic rheological liquid with electromagnetic coupling effect and preparation method thereof
  • Ni/TiO2-based electromagnetic rheological liquid with electromagnetic coupling effect and preparation method thereof
  • Ni/TiO2-based electromagnetic rheological liquid with electromagnetic coupling effect and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] a) Preparation of base liquid

[0040] Mix fluorinated silicone oil (70v%) and simethicone oil (30v%) evenly to obtain compound base fluid;

[0041] b) Nano-nickel powder prepared by spray deposition method (TEM image as shown in figure 1 As shown, the XRD pattern is as figure 2 As shown, the infrared spectrum FT-IR is shown as image 3 shown) into a NaOH solution with a concentration of 6 mol / L, and uniformly stirred to hydroxylate the surface of Ni particles; after dispersion treatment, and then washed with deionized water until neutral, the precipitate was separated to obtain particle A;

[0042] c) adding an ethanol solution of barium titanate with a volume ratio of 1:1 to microparticles A, wherein the molar ratio of microparticles A to barium titanate is 4:1, vigorously stirring for sol-gel reaction, resulting in precipitation, and Particle B was obtained by precipitation and separation; after drying the particle B, the first layer of coated TiO was generated ...

Embodiment 2

[0047] a) Preparation of base liquid

[0048] Mix fluorinated silicone oil (30v%) and dimethicone oil (70v%) evenly to obtain compound base fluid;

[0049] b) adding the nano-nickel and NaOH solution into the NaOH solution with a concentration of 8mol / L in a ratio of 1:45 by weight and stirring evenly; stirring until the reaction is complete to obtain precipitation, and separating the precipitation to obtain particle A;

[0050] c) adding an ethanol-tetrabutyl titanate solution with a volume ratio of 1:1.25 to the microparticles A, wherein the molar ratio of the microparticles A to tetrabutyl titanate is 6:1, stirring evenly, separating and precipitating to obtain the microparticles B;

[0051] c) Add the ethanol mixed solution containing deionized water, urea and SDBS to microparticles B, wherein the volume ratio of deionized water: urea and SDBS: absolute ethanol is 1:4:10, and the volume ratio of urea, SDBS and microparticles B The weight ratio is 1:4, stir evenly until th...

Embodiment 3

[0054] a) Preparation of base liquid

[0055] Mix fluorinated silicone oil (40v%) and simethicone oil (60v%) evenly to obtain compound base fluid;

[0056] b) adding the nano-nickel and NaOH solution prepared by the electrochemical method into the NaOH solution with a concentration of 8mol / L in a weight ratio of 1:45 and stirring evenly; stirring until the reaction is complete to obtain precipitation, and separating the precipitation to obtain particle A;

[0057] c) adding an ethanol-tetrabutyl titanate solution with a volume ratio of 1:1.25 to the microparticles A, wherein the molar ratio of the microparticles A to tetrabutyl titanate is 6:1, stirring evenly, separating and precipitating to obtain the microparticles B;

[0058] c) Add an ethanol mixed solution containing deionized water and urea to microparticles B, wherein the volume ratio of deionized water: SDBS: absolute ethanol is 1:2:15, and the weight ratio of SDBS to microparticles B is 1:8 , stir evenly until the r...

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Abstract

The invention relates to Ni / TiO2-based electromagnetic rheological liquid with electromagnetic coupling effect and a preparation method thereof. The dispersed phases of the electromagnetic rheological liquid are composite particles which are respectively in a core-shell structure, wherein nano-metallic conductive particles (Ni) are taken as a core, titanium dioxide (TiO2) is taken as a coating shell, and the composite particles are modified by polar molecules. The preparation method comprises the following steps: preparing nano-nickel particles by using a physical method, wherein the particlediameter is 30-200nm; carrying out hydroxylation treatment on the nano-nickel particles to obtain particles A; coating TiO2 on the particles A to obtain particles B; carrying out heat treatment on the particles B to obtain Ni / TiO2 composite particles or coating urea and SDBS polar molecules at the outer layers of the particles B to obtain particles C; carrying out heat treatment on the particles C to obtain Ni / TiO2 / Urea and Ni / TiO2 / SDBS composite particles; and dispersing the composite particles into the basic liquid to obtain the electromagnetic rheological liquid in which the volume concentration of the composite particles is 10-50%. The preparation method of the invention is simple and can be operated easily; a sol-gel method and a controllable molecule synthesizing technology are adopted; and the prepared electromagnetic rheological liquid not only has the properties of the electro-rheological liquid but also has the properties of the magneto-rheological liquid.

Description

technical field [0001] The invention relates to an electromagnetic rheological fluid and a preparation method thereof, in particular to an electromagnetic rheological fluid having a core-shell structure with a conductive and magnetically conductive dispersion medium, which has a coupling effect under the action of an electromagnetic field, and a preparation method thereof. Background technique [0002] Electrorheological fluid is generally a suspension formed by dispersing polarizable particles in a base fluid. When an electric field is applied to it, its viscosity and shear strength change several orders of magnitude instantaneously, from a low-viscosity fluid that is easy to flow to a high-viscosity viscoelastic solid that is difficult to flow or does not flow. When the electric field is removed, it can instantly return to the liquid state. This change is reversible and continuous, showing good electrical control mechanical behavior. The adjustable damper made of it has a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M171/00C10M177/00C10N40/14C10M169/04
Inventor 谭锁奎郭红燕钱坤明纪松吴敏周宇松逯庆国
Owner NO 52 INST OF CHINA NORTH IND GRP CORP
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