Preparation method of Ag@SiO2 core-shell structure nano composite
A technology of nano-composite materials and core-shell structure, which is applied in the field of preparation of AgSiO2 core-shell structure nano-composite materials, can solve the problems of low product purity, cumbersome process, and high experience requirements
Active Publication Date: 2013-06-12
SHANDONG UNIV
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[0006] The preparation method of metal / silicon oxide core-shell nanoparticles is mainly a liquid phase deposition method. In a mixed solution of absolute ethanol and ammonia water, Ag metal particles are used as seeds, and TEOS is hydrolyzed and deposited on the metal surface to form SiO 2 Shell layer, the preparation method has high requirements for experience, poor reproducibility, cumbersome process, low purity of the product obtained, and large one-time investment, which restricts the AgSiO 2 Practical application of core-shell nanocomposites
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[0011] Technical scheme of the present invention is as follows:
[0012] a AgSiO 2 A preparation method for a core-shell structure nanocomposite material, comprising the following steps:
[0013] (1) Use non-ionic surfactant, oil phase, and co-surfactant to prepare inverse microemulsion as mother liquor, wherein, non-ionic surfactant: oil phase: co-surfactant = 4:5~10:0~4 mass ratio;
[0014] The nonionic surfactant is isobutylphenol polyoxyethylene (10) ether (Triton X-100, TX-100), oligomeric surfactant (Tyloxapol, average degree of polymerization n is 7), nonylphenol Polyoxyethylene ether NP8, nonylphenol polyoxyethylene ether NP15 or fatty alcohol polyoxyethylene ether C 16 E. 10 ;
[0015] Described oil phase is hexanaphthene, normal hexane or sherwood oil;
[0016] Described cosurfactant is n-pentanol, n-hexanol or n-octanol;
[0017] (2) Take the mother liquor of step (1) in the reaction bottle, and add the concentration of 0.1 ~ 0.2mol L -1 Silver nitrate solut...
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Abstract
The invention relates to a preparation method of an Ag@SiO2 core-shell structure nano composite, which is characterized in that an inverse micro-emulsion method serves as a template; NaBH4 serves as a reducing agent; AgNO3 serves as an Ag precursor; tetraethoxysilane (TEOS) serves as an SiO2 precursor; ammonia water serves as a catalyst; continuous sampling is conducted; and generation of Ag nanocrystallines and covering of SiO2 shells are conducted in one reactor. The prepared Ag@SiO2 core-shell composite is regular in pattern, and has an appreciable material property; the pattern and a dimension of the Ag@SiO2 core-shell composite can be adjusted conveniently by changing a technological condition; and the synthesized Ag@SiO2 core-shell structure nano composite by the method is simple in technology, low in equipment requirement, high in production efficiency and low in cost.
Description
technical field [0001] The present invention relates to a kind of AgSiO 2 The invention discloses a method for preparing a nanocomposite material with a core-shell structure, belonging to the technical field of nanomaterial preparation. Background technique [0002] In recent years, the preparation of core-shell nanocomposites (especially metal / oxide core-shell nanocomposites) has aroused widespread research interest. It is an important component in the construction of new functional composite materials. There are important applications in the fields of microwave absorbing materials, catalysts and biology. Core-shell structure nanocomposites, which are enriched with different components inside and outside, show a special double-layer or multi-layer structure. Through the functional recombination and complementarity of the core and the shell, new functional materials that are different from the performance of the core or the shell itself can be prepared, which provides a ve...
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IPC IPC(8): B22F9/24B82Y40/00
Inventor 辛霞卢杭徐桂英任华英鞠焕凤
Owner SHANDONG UNIV