4results about How to "Increase surface charge" patented technology

This application relates to the field of metal powder preparation technology, and in particular to a method for preparing silver powder for ultrafine line printing, comprising the following steps: preparing a silver ammonia solution and adding a dispersant, stirring to dissolve, adding a reducing agent solution, and aging to obtain nano-silver sol; forming a mixture of an initiator and deionized water, preparing aqueous solutions of acrylic acid and acrylamide separately, and adding them to the mixture for reaction, cooling and filtering to obtain an acrylic acid-acrylamide copolymer; weighing silver nitrate and deionized water, stirring to obtain solution A; weighing a reducing agent and deionized water, adjusting the pH to 1-2, and then adding the nano-silver sol and acrylic acid-acrylamide copolymer to obtain solution B; rapidly adding solution A to solution B, adding a surface modifier after the reaction is complete, aging, centrifuging, washing, and drying. The silver powder prepared by this application has the advantages of small average particle size, good overall uniformity, and small surface area, making it suitable for the field of ultrafine line printing.

The invention discloses a horseradish peroxidase mutant with improved thermal stability and construction and application of genetically engineered bacteria of the horseradish peroxidase mutant, and belongs to the technical field of biology. The horse radish peroxidase mutant capable of efficiently catalyzing oxidation reaction of various organic and inorganic substrates is constructed, compared with wild type HRP, the half-life period of the mutant at the temperature of 50 DEG C is prolonged, and the half-life period of double mutants can be prolonged to 4 times that of the wild type HRP. The horse radish peroxidase variant disclosed by the invention has a wide application prospect, particularly shows excellent catalytic efficiency and stability under harsh reaction conditions, and provides a better enzyme tool for the fields of industry and biomedicine.

The invention discloses a preparation method of an MXene-CMC composite membrane for salinity difference energy collection. The preparation method specifically comprises the following steps: step 1, preparing an MXene solution; step 2, preparing a CMC solution; step 3, putting the MXene solution prepared in the step 1 into the CMC solution prepared in the step 2, and dissolving the MXene solution through electromagnetic stirring to obtain a mixed dispersion liquid; step 4, taking a polycarbonate film, putting the polycarbonate film into a suction flask by taking the polycarbonate film as a substrate, and carrying out vacuum-assisted suction filtration on the mixed dispersion liquid in the suction flask to obtain a polycarbonate film covered with an MXene-CMC composite film; and step 5, stripping the polycarbonate film covered with the MXene-CMC composite film, and filtering water to obtain the MXene-CMC composite film for salinity gradient energy collection. The invention also discloses an MXene-CMC composite membrane for collecting salinity difference energy. The composite membrane prepared by the invention has the characteristics of high power density, good stability and high economic value.

The invention belongs to the technical field of hybrid materials, and particularly relates to a nickel aluminum hydrotalcite-zinc oxide-ethylene glycol chitosan hybrid material as well as a preparation method and application thereof. The invention provides a nickel aluminum hydrotalcite-zinc oxide-ethylene glycol chitosan hybrid material, which is of a core-shell structure, and takes ethylene glycol chitosan as a shell to wrap nickel aluminum hydrotalcite and zinc oxide. According to the nickel-aluminum hydrotalcite-zinc oxide-ethylene glycol chitosan hybrid material (NiAl-LDH-ZnO / GCS), nickel-aluminum hydrotalcite and zinc oxide are wrapped by ethylene glycol chitosan, and the nickel-aluminum hydrotalcite-zinc oxide-ethylene glycol chitosan hybrid material shows efficient antibacterial activity on staphylococcus aureus, escherichia coli and saccharomycetes when the pH value is higher than 6.5, including the pH value in an alkaline environment is as high as 10; under the irradiation of light with the wavelength of about 390 to 420 nm, the NiAl-LDH (at) ZnO / GCS shows strong photocatalytic antibacterial activity.