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Preparation method for silver-coated silicon dioxide composite microsphere particles

A technology of composite microspheres and silica, applied in the field of nanomaterials, can solve the problems of the uniformity and compactness of the coating layer, and achieve compactness and uniformity, avoid agglomeration, and have good monodispersity. Effect

Inactive Publication Date: 2013-07-31
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method for preparing silver-coated silica nano-microsphere composite particle material is relatively simple, easy to operate and implement, but it is difficult to grasp the uniformity and compactness of the coating layer.

Method used

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  • Preparation method for silver-coated silicon dioxide composite microsphere particles
  • Preparation method for silver-coated silicon dioxide composite microsphere particles
  • Preparation method for silver-coated silicon dioxide composite microsphere particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] ①Preparation of nano-silica particles

[0038] Mix 0.15ml of tetraethyl orthosilicate and 0.55ml of absolute ethanol evenly to obtain a silicon source mixture, which is transferred to a dropping funnel; 6ml of 25% ammonia water and 20ml of absolute ethanol Mix in a two-necked flask to obtain the mixed solution B, magnetic stirring, the magnetic sub-rotation speed is 250rpm (the magnetic sub-rotation speed can also be 200 or 300rpm), and the water bath is heated while stirring, and the water bath temperature is 25°C (the water bath temperature can also be 20 or 40°C), while heating in a water bath, add the silicon source mixed solution to the mixed solution B drop by drop at a rate of 0.3d / s (the drop rate can also be 0.1 or 0.5d / s); after the addition is complete , stirred for 2 hours, and then centrifuged, the centrifugation time was 20min, the speed was 5000rpm, the precipitate obtained by centrifugation was ultrasonically dispersed, washed with distilled water, and t...

Embodiment 2

[0045] The heating temperature of the water bath for preparing the composite microsphere particle solution in step ② of this embodiment is 30° C., and the addition amount and operation steps of other reagents are the same as those of the first embodiment. image 3 It is the XRD spectrum of the silver-coated silica composite microsphere particles in this example. In the X-ray diffraction spectrum, there are diffraction peaks corresponding to silica and silver at 2θ at 10° to 80°, and there is a diffraction peak at 2θ=23°. Diffuse peak, which is a standard characteristic peak of silica, and its crystal form is amorphous like traditional silica gel. At the same time, the last five peaks correspond to the (111), (200), (220), (311) and (222) crystal planes of cubic silver respectively, indicating that the silver in the silicon shell exists in the form of a simple substance with a face center Cubic structure. Figure 4 It is the absorption spectrum of the silver-coated silica comp...

Embodiment 3

[0047] The heating temperature of the water bath for preparing the composite microsphere particle solution in step ② of this embodiment is 70° C., and the addition amount and operation steps of other reagents are the same as those of the first embodiment. Figure 6 It is a scanning electron microscope (SEM) image of silver-coated silica composite microsphere particles in this example.

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Abstract

The invention discloses a preparation method for silver-coated silicon dioxide composite microsphere particles. The preparation method comprises the steps as follows: preparing nano silicon dioxide particles; sulfhydrylating the silicon dioxide particles; dispersing the sulfhydryl-modified silicon dioxide particles in a silver ammonia solution; and adding polyvinylpyrrolidone to obtain final products, namely the silver-coated silicon dioxide composite microsphere particles. According to the preparation method, the concentration, the temperature and the pH value of the solution are adjusted, and polyvinylpyrrolidone which is both a reductant and a surfactant is used at the same time, so that on one hand, new silver nanoparticles are prevented being oxidized, on the other hand, the silver nanoparticles are prevented from further growing, and therefore, the compactness and the uniformity of a nanosilver coating layer and the directional control of the thickness of the nanosilver coating layer can be achieved; and the preparation method is simple, low in raw material cost and suitable for industrial production.

Description

technical field [0001] The invention relates to a silicon dioxide microsphere particle, in particular to a preparation method of a silicon dioxide composite microsphere particle, and belongs to the technical field of nanomaterials. Background technique [0002] Metal-coated composite powder is a powder with a core-shell structure, in which the cladding shell is metal, and the core can be metal or non-metal, such as oxide (Al 2 o 3 , ZrO 2 , SiO 2 ), carbide (WC, TiC, SiC), graphite, diamond, polymer and other non-metallic materials. Metal-coated non-metallic powders are widely used in many fields because they have both the properties of metal and non-metal, give full play to the advantages of both, and combine the specialties of both. Some commodities have been supplied abroad, and a lot of research work has been done in our country, and certain results have been obtained. [0003] The nanonization of materials gives them unique properties, such as surface effects, volu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B22F9/24
Inventor 诸跃进洪阳张京王培卿冯姜伟
Owner NINGBO UNIV
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