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Preparation method of carbon-inlaid hollow TiO2 microspheres and electrorheological fluid based on TiO2 microspheres

An electrorheological fluid, hollow technology, applied in lubricating compositions, additives, petroleum industry, etc., can solve problems such as low output and complex process flow, achieve uniform distribution, improve sedimentation rate, and facilitate electrorheological effects.

Active Publication Date: 2022-07-22
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing methods for preparing electrorheological particles with a hollow structure, such as etching method and template method, are relatively complicated in process and low in yield.

Method used

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  • Preparation method of carbon-inlaid hollow TiO2 microspheres and electrorheological fluid based on TiO2 microspheres
  • Preparation method of carbon-inlaid hollow TiO2 microspheres and electrorheological fluid based on TiO2 microspheres
  • Preparation method of carbon-inlaid hollow TiO2 microspheres and electrorheological fluid based on TiO2 microspheres

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The embodiment of the present invention provides a carbon inlaid hollow TiO 2 The preparation method of microspheres comprises the following steps:

[0046] Step 1: Formulation of TiO 2 The methylcellulose suspension, in which the mass fraction of methylcellulose is 0.8%-1.1%, TiO 2 The mass fraction is 8%-12%.

[0047] Specifically, at first, 10g of methylcellulose particles (purchased from Sinopharm Chemical Reagent Co., Ltd., with the specification of AR) and 90g of pure water were poured into the beaker, and then a magnetic stirrer was used to stir the mixed solution for 10h (hour) to obtain Methylcellulose solution with a mass fraction of 10%; secondly, 3g of TiO with a particle size of 50nm 2 The particles (purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.) were dispersed in 25 g of deionized water, and 3 g of methyl cellulose solution with a mass fraction of 10% was added after fully stirring; Methylcellulose solution required for balls.

[00...

Embodiment 2

[0058] Using the hollow porous TiO prepared in Example 1 2 -C particles are dispersed phase, and electrorheological fluid is prepared. First, it is necessary to heat and dry the dimethyl silicone oil used in the preparation, the heating temperature is 120 °C, and the heating time is 48 h, in order to avoid the existence of moisture in the dimethyl silicone oil from affecting the accuracy of the experimental data. Second, TiO with different carbon contents was mixed at room temperature 2 After the -C particles are mixed with the dried dimethyl silicone oil according to a certain proportion, the dispersed phase and the continuous phase are mixed uniformly by grinding to prepare a uniform suspension fluid. The concentration of ERF can be expressed as the amount of continuous phase mixed with each gram of particles, eg, 10 grams of dispersed phase mixed with 5 ml of continuous phase, which produces an ERF concentration expressed as 0.5. The concentration of all ERFs in this expe...

Embodiment 3

[0061] The electrorheological properties, rheological properties, anti-settling stability and temperature stability of the four ERFs prepared in Example 2 were characterized. The experimental results are as follows:

[0062] (1) TiO 2 - Electrorheological properties of C-ERF

[0063] First through TiO 2 -C-20%-ERF, TiO 2 -C-30%-ERF, TiO 2 -C-40%-ERF and TiO 2 The yield strength of the corresponding ERF can be obtained by the electrorheological property test of -C-50%-ERF. For specific data, see Figure 5 (a). It can be found that all of these ERFs have electrorheological effects, and the applied electric field and shear rate are 0.1s -1 Under the condition of , its yield strength will increase with the increase of the applied electric field. According to the dielectric theory, under the action of an external electric field, the positive and negative charges of the electrorheological particles move to the negative and positive electrodes, respectively, forming dipoles. ...

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Abstract

The invention provides a preparation method of carbon inlaid type hollow TiO2 microspheres and an electrorheological fluid based on the carbon inlaid type hollow TiO2 microspheres. The preparation method comprises the following steps: preparing hollow porous TiO2 micron microspheres by adopting a spray drying method, sintering the hollow porous TiO2 micron microspheres containing glucose to obtain non-polar molecular carbon inlaid type hollow TiO2-C microspheres, and continuously mixing the TiO2-C microspheres with silicone oil and the like to prepare TiO2-C-ERF. Compared with an existing template method and an etching method which are complex in process and low in yield for preparing hollow particles, the preparation method can be used for simply, conveniently and efficiently preparing the heat-stable hollow TiO2-C-based electrorheological fluid with the hollow structure in batches.

Description

technical field [0001] The invention relates to the technical field of electrorheological fluids, in particular to a carbon-inlaid hollow TiO 2 Preparation method of microspheres and based on the carbon inlaid hollow TiO 2 Electrorheological fluid of microspheres. Background technique [0002] In the field of electrorheological fluids (ERFs), giant electrorheological fluids (GERFs), which are rich in polar molecules, have attracted much attention due to their high yield strength under external electric field conditions. However, due to the existence of polar molecules, on the one hand, it will lead to a wide range of fluctuations in its electrorheological properties under higher and low temperature environments, such as the yield of silicone oil-based single-liquid-phase (SLP) type GERF. The strength will increase with the increase of temperature in the temperature range of 0-60 °C, and start to decrease when the temperature is higher than 60 °C; on the other hand, the exi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M171/00C10M125/00C10M169/04C10N40/16
CPCC10M171/001C10M125/00C10M169/04C10M2229/0415C10M2201/041C10M2201/062C10N2040/16C10N2030/60
Inventor 薛厂梁宇岱韩宇兵时权温维佳巫金波
Owner SHANGHAI UNIV
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