Preparation method of negative cruvature SiO2 surface load nano-silver composite material
A technology of surface loading and composite materials, which is applied in the field of precious metal nanomaterials, can solve the problems of low loading efficiency and loading uniformity to be improved, and achieve the effect of high assembly density and good uniformity
Active Publication Date: 2015-12-02
ZHEJIANG UNIV
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Problems solved by technology
In the previous research of the applicant, SiO with silver on the inner wall was prepared by the silver mirror reaction in the aqueous solution system. 2 Microspheres have been well applied in the field of antibacterial, but this method has problems such as low loading efficiency and loading uniformity.
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[0020] The present invention will be further described in detail below in conjunction with specific embodiments. The embodiments may enable the professional and technical personnel in the field to understand the present invention more comprehensively, but do not limit the present invention in any way.
[0021] Negative curvature SiO 2 The preparation method of surface-loaded nano-silver composite material includes the following steps:
[0022] Step A:
[0023] Disperse polystyrene microsphere powder with a diameter of 3-8μm into 98% concentrated sulfuric acid, stir in a 40℃ water bath at 100 rpm for 4 hours. The concentrated sulfuric acid and polystyrene microsphere powder The mass ratio of the product is 50-100:1; after the product is centrifuged, repeat the operation of anhydrous ethanol dispersion stirring and centrifugal separation at least 3 times, and make the final washing clear liquid neutral; then the obtained sulfonated polymer Disperse styrene microspheres in ethanol to ...
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Abstract
The invention relates to the field of precious metal nanometer materials and aims to provide a preparation method of a negative cruvature SiO2 surface load nano-silver composite material. The method comprises that a sulfonated polystyrene microsphere dispersion solution and an AgNO3-ethylene glycol solution are stirred in a shading condition, and a sulfonated polystyrene microsphere dispersion solution with silver ions absorbed to the surface is obtained; the mixed solution is dropwise added to a polyvinylpyrrolidone-ethylene glycol solution, acetone is added and stirring is performed, the mixed solution is dispersed into ethyl alcohol after sediment is filtered and washed, and a polystyrene / Ag composite microsphere dispersion solution is obtained; the solution is in reaction with tetraethoxysilane, a product is calcined after separation, washing and drying, and a product is obtained. According to the preparation method, the problems that the features are not uniform and the yield is not high due to the fact that a weak reducing agent PVP is relied on for directly reducing and preparing nano-silver in a water solution system are solved, and PS / Ag nano composite particles with large packing density of surface load spherical nano-silver and excellent uniformity are obtained. The problem that a nano-silver single particle surface is difficult to enhance the local electromagnetic field of the nano-silver surface is solved.
Description
Technical field [0001] The present invention relates to the field of precious metal nanomaterials, in particular to negative curvature SiO 2 The preparation method of surface loaded nano silver composite material. Background technique [0002] Noble metal nanomaterials exhibit many special optical phenomena due to surface plasmon resonance, and have shown great application prospects in the fields of biological detection, image sensing, and disease diagnosis and treatment. Surface-enhanced fluorescence (SEF) is one of the main special effects of precious metal nanomaterials. The fluorescence emission intensity is greatly enhanced through the coupling of the excited fluorophore and the precious metal surface plasma. At present, the design of noble metal nanostructures from the perspective of structural "hot spots" has become the mainstream of research, especially nano-island membranes have been widely used in SEF research. However, the existing nano-precious metal island films are...
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IPC IPC(8): B01J13/02
Inventor 杨辉沈昕王景南申乾宏
Owner ZHEJIANG UNIV