Surfactant assisted in situ co-precipitation method for preparing core-shell structure nano powder

A surfactant, in-situ co-precipitation technology, applied in the chemical industry, can solve the problems of low interface bonding strength, large extrinsic loss, uneven distribution, etc., and achieve the effects of low cost, uniform particle size and simple preparation process

Inactive Publication Date: 2015-04-08
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a large extrinsic loss in the two-phase kneading and sintering composite ceramics, which greatly limits its wide application.
In order to overcome the shortcomings of coarse particles, low interfacial bonding strength, uneven distribution, and poor density of composite materials prepared by two-phase kneading and sintering, it is urgent to develop composite materials with good dispersion, uniform particle size, high crystallinity, and coating structure. phase powder preparation technology

Method used

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  • Surfactant assisted in situ co-precipitation method for preparing core-shell structure nano powder
  • Surfactant assisted in situ co-precipitation method for preparing core-shell structure nano powder
  • Surfactant assisted in situ co-precipitation method for preparing core-shell structure nano powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Dissolve a portion of 0.05mol of barium nitrate, 0.05mol of strontium nitrate and 0.1mol of magnesium nitrate in 200ml of deionized water, stir well to obtain a solution containing Ba, Sr and Mg;

[0026] 2) Dissolve 0.2mol oxalic acid in 200ml ethanol and stir evenly to obtain an oxalic acid-ethanol solution;

[0027] 3) Dissolve a portion of 0.1mol butyl titanate in the above oxalic acid-ethanol solution and stir evenly to obtain a titanium oxalate solution;

[0028] 4) Dissolve a portion of 0.0263mol (10ml) oleic acid in 50ml ethanol solution, and stir evenly at a temperature of 60°C to obtain a surfactant solution;

[0029] 5) Mix and stir the solution containing Ba, Sr, Mg obtained above, the solution containing Ti, and the surfactant solution, and then slowly add ammonia water to adjust its pH=2 to obtain oleic acid-modified Ba 0.5 Sr 0.5 TiO 3 MgO precursor solution;

[0030] 6) Add the above Ba 0.5 Sr 0.5 TiO 3 The MgO precursor solution was subjected ...

Embodiment 2

[0034] 1) Dissolve a portion of 0.05mol of barium nitrate, 0.05mol of strontium nitrate and 0.1mol of magnesium nitrate in 200ml of deionized water, stir well to obtain a solution containing Ba, Sr and Mg;

[0035] 2) Dissolve 0.2mol oxalic acid in 200ml ethanol and stir evenly to obtain an oxalic acid-ethanol solution;

[0036] 3) Dissolve a portion of 0.1mol butyl titanate in the above oxalic acid-ethanol solution and stir evenly to obtain a titanium oxalate solution;

[0037] 4) Dissolve a portion of 0.0367mol (10g) sodium dodecylsulfonate in 50ml of deionized water, and stir evenly at a temperature of 60°C to obtain a surfactant solution;

[0038] 5) Mix and stir the solution containing Ba, Sr, Mg obtained above, the solution containing Ti, and the surfactant solution, and then slowly add ammonia water to adjust its pH=2 to obtain oleic acid-modified Ba 0.5 Sr 0.5 TiO 3 MgO precursor solution;

[0039] 6) Add the above Ba 0.5 Sr0.5 TiO 3 The MgO precursor solution wa...

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PUM

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Abstract

The invention discloses a surfactant assisted in situ co-precipitation method for preparing a core-shell structure nano powder. The preparation process is as follows: weighing nitrate of strontium, barium and magnesium according to the precise stoichiometric ratio, and dissolving the three in water to prepare a solution A; weighing butyl titanate according to precise stoichiometric ratio and dissolving the butyl titanate in an ethanol-oxalic acid solution to prepare a solution B; weighing a certain amount of a surfactant and dissolving the surfactant in hot water-alcohol to prepare a solution C; slowly dropwise adding ammonia into a mixed solution of A, B and C for a co-precipitation reaction; controlling the pH value of the reaction system at 2; and subjecting the precipitate to filtering, washing, heat treatment and grinding to obtain a Ba1-nSrnTiO3 @ MgO core-shell structure nano powder with high degree of crystallinity. The invention has the advantages of simple preparation process, short cycle and low cost, and the obtained nano composite powder has good dispersibility, uniform particle size, high degree of crystallinity and coating structure, so as to meet the purpose of practicality.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for preparing nano-powder with core-shell structure by in-situ co-precipitation assisted by surfactant. Background technique [0002] barium strontium titanate ferroelectric material (Ba 1-n Sr n TiO 3 , BST) because its Curie temperature is adjustable with the ratio of Ba / Sr and has strong dielectric nonlinearity and low dielectric loss in the paraelectric state, so it is used in tuners, filters, phase shifters, etc. Microwave devices have broad application prospects and have become one of the research hotspots at home and abroad in recent years. However, the dielectric constant of BST ferroelectric materials in the microwave frequency range is relatively high, and it is difficult to meet the requirements for matching the internal impedance of the excitation source and high-power devices. The use of low dielectric constant microwave medium MgO ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/628
Inventor 张景基王疆瑛姬卢东高亚锋陈航宇李翰奇黄智源
Owner CHINA JILIANG UNIV
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