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2693 results about "Silver particles" patented technology

Ag/graphene nanometer conductive compound material and preparation method thereof

The invention provides a novel nanometer silver particle/graphene conductive compound material, which belongs to the technical field of compound materials. The preparation method of the material comprises the following steps of: ultrasonically dispersing oxidized graphite in water for 1 to 2 hours, adding silver nitrate solid, keeping ultrasonically dispersing for 25 to 30 minutes, raising the temperature to 70 to 80 DEG C, adding sodium borohydride for reflux reaction for 1 to 2 hours, thermally filtering, washing, drying and grinding to obtain the Ag/graphene nanometer conductive compound material. The Ag/graphene nanometer conductive compound material can be prepared by a one-step reduction method, which is simple in process, convenient in operation, mild in reaction and high in production efficiency; in the prepared conductive compound material, the nanometer silver particles are uniformly absorbed on the edge of the graphene so as to form a conductive network where Ag and the graphene are staggered mutually; therefore, the dispersion of the nanometer silver particles is improved, and the thermal stability and the conductivity of the graphene are enhanced; and the Ag/graphene nanometer conductive compound material has a good industrial production prospect.
Owner:NORTHWEST NORMAL UNIVERSITY

Silver-carrying titanium dioxide anti-bacterial agent and preparation method thereof

InactiveCN102205244AEnhance photocatalytic antibacterial effectReduce compoundingBiocideFungicidesMicrosphereCombined method
The invention belongs to the technical field of environmental catalytic materials and specifically relates to a preparation method of a silver-carrying titanium dioxide anti-bacterial agent. The anti-bacterial agent comprises titanium dioxide microspheres as carriers with a high length-diameter ratio and silver particles distributed on surfaces or interiors of the titanium dioxide microspheres. The preparation method comprises a titanium dioxide microsphere preparation method and a silver particle carrying method, wherein the silver particle carrying method adopts the following three methods of a complex reaction and photo-reduction combined method, a direct photo-reduction method and an excessive immersion method. The operation of the present preparation method is simple. Titanium dioxide carriers prepared by the present preparation method has a high length-diameter ratio, a high crystallinity and thus can reduce effectively recombination of electrons and holes and enhance titanium dioxide photocatalytical and anti-bacterial effects, and the silver particle carrying method can effectively control a dispersibility of silver and make silver be distributed on surfaces or interiors of titanium dioxide microspheres to realize a slow release of silver, avoid color change, and enhance anti-bacterial effects simultaneously.
Owner:FUDAN UNIV

Preparation method of mesoporous hollow spherical silver-loaded silicon dioxide antimicrobial

The invention relates to a preparation method of antimicrobial, and aims at providing a preparation method of mesoporous hollow spherical silver-loaded silicon dioxide antimicrobial, which comprises the following steps that polystyrene microspheres are added into mixed solution of ethanol with dissolved hexadecyl trimethyl ammonium bromide and de-ionized water to be uniformly mixed, then ammonia is added, ethyl orthosilicate is gradually dropped, the obtained solution is filtered, washed and dried to obtain compound powder with polystyrene being wrapped by silicon dioxide microspheres; the powder is subjected to heat preservation at the temperature of 550 DEG C to obtain hollow silicon dioxide microspheres; and under a light-resistant condition, the hollow silicon dioxide microspheres are soaked inside silver nitrate solution, and then the solution is filtered, dried and heated to the temperature of 300 to 500 DEG C so as to obtain the mesoporous hollow spherical silver-loaded silicon dioxide antimicrobial. The dispersivity and the stability of silver particles are improved, so that the agglomeration problem of traditional nano antimicrobial powder can be effectively solved. Meanwhile, the antimicrobial can be slowly released through mesoporous, the releasing of silver particles can be effectively maintained for a long time so as to realize the lasting antibacterial effect.
Owner:ZHEJIANG UNIV
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