53results about How to "Limit reunion" patented technology

The invention discloses a method for preparing an Ag-carrying bacterial cellulose hydrogel antimicrobial dressing and a product thereof. The method comprises the following steps of: soaking a bacterial cellulose hydrogel film in solution of silver metal precursor; then heating the film to be between 121 and 135 DEG C in a high-pressure sterilizing pot, and pressurizing between 0.205 and 0.313MPa;standing bacterial cellulose for 5 to 30min; and then taking the treated bacterial cellulose out for washing, partial dehydration, packaging and sterilization to obtain an Ag-carrying bacterial cellulose hydrogel antimicrobial dressing which is formed by compounding silver metal nano-particles and bacterial cellulose and is attached with 0.01 to 10 weight percent of the silver metal nano-particles in a bacterial cellulose three-dimensional porous network structure. The preparation process of the invention has the advantages of simplicity, easiness, convenient operation, controllable preparation technology, no pollution and low cost; and the prepared nano-particles have the advantages of high purity, small particle size, uniform size and good dispersity. The obtained Ag-carrying bacterial cellulose hydrogel antimicrobial dressing has the characteristics of good antimicrobial property, high water content, good water-retaining property, strong toughness, good air permeability and the like, and can meet the requirements of treating various wounds by a wet method.

The present invention proposes a method for preparing nano-silicon carbide at low temperature. The method adopts a "double confinement" process, first preparing a silica / carbon compound by pyrolyzing the compound of silica / polymer, and then obtaining The complex is mechanically mixed with metal magnesium or calcium, heat-treated in a closed reactor, and finally, washed sequentially with hydrochloric acid and hydrofluoric acid to obtain nanostructured SiC. In this synthetic route, the carbon skeleton in the silica / carbon composite provides the first confinement effect to limit the growth of nano-SiC, while the closed reactor provides the second confinement effect to reduce the temperature of carbothermal reduction. The nano-silicon carbide prepared by the method has a large specific surface area and abundant pores, and can be used as a carrier to load a metal silver catalyst and be used as a negative electrode material of a lithium-ion battery. The method for preparing nano-silicon carbide provided by the invention has a simple process and is convenient for realizing large-scale production.

The invention particularly relates to a preparation method of oxide nanopowder, which belongs to the field of inorganic non-metallic nanomaterials, specifically a method for preparing zinc oxide, titanium oxide or zirconia nanopowder using bacterial cellulose membrane as a carrier , Wash the bacterial cellulose membrane and fully soak it in the oxide precursor solution, then take out the membrane and dry it, and then roast it in an air or oxygen atmosphere to obtain nanoscale oxide powder. The preparation process of the method is simple, easy to operate, controllable in preparation technology, less in pollution, and lower in cost; the prepared nanopowder has high purity, small particle size, uniform size and good dispersion; by simply changing the experimental conditions The controllable preparation of nanoparticle size and distribution can be realized, and it has broad application value in the field of industrial production.