31results about How to "No complex post-processing required" patented technology

The invention provides a novel simple biomolecule fixing method, comprising the following steps: firstly synthesizing a metal nano material by a liquid-liquid interface method; then adding biomolecules to a water phase for fixing the biomolecules to the liquid-liquid interface by a bonding action, thus obtaining a composite membrane of the metal nano material and the biomolecules; and finally, extracting the biomolecule-metal composite monodisperse membrane on the liquid-liquid interface by a langmuir technology or directly by a solid substrate. The method for fixing biomolecules provided by the invention has a simple preparation process for forming the biomolecule-metal nano composite material, and has the characteristic that the biomolecules are dispersed in order in a single layer and have good stability.

The invention discloses a method for preparing a melamine molecularly imprinted polymer by virtue of distillation, precipitation and polymerization. The method comprises the following steps: (1) dissolving melamine, a polymerization reaction monomer and divinylbenzene in acetonitrile, and standing; (2) adding an initiating agent into the solution of the step (1), removing oxygen, and heating to distill acetonitrile; and (3) after the distillation in the step (2), filtering the reaction solution, performing refluxing extraction on filter residues by using a methanol-acetic acid mixed solution, and drying to obtain the melamine molecularly imprinted polymer. By adopting the method disclosed by the invention, the problems that the molecularly imprinted polymer obtained by the conventional method is non-uniform in particle size, difficult in size control and low in binding capacity; the method disclosed by the invention is simple to operate and does not need a complex after-treatment process, and the obtained molecularly imprinted polymer microspheres have good monodispersity and binding capacity of 32-44mg / g, and can be used for separating and detecting melamine in a sample.

The invention discloses a preparation method of a rare-earth-based fluorite type high-entropy oxide powder material and belongs to the field of rare earth oxide powder materials. The method is a low-temperature combustion synthesis method and specifically comprises the following steps: taking rare earth nitride as a metal source and one or a mixture of more of urea, acetic acid, ammonium acetate,oxalic acid and glycine as fuel; and controlling the concentration of metal salt raw materials, types and adding amounts of the fuel, types and adding amounts of a combustion improver and an ignitionmanner to regulate and control properties including granularity, shapes and the like of rare-earth-based fluorite type high-entropy oxide powder. According to the preparation method disclosed by the invention, liquid-phase ingredients are adopted to ensure that a molecular level of the raw materials is uniform and a stoichiometric proportion of a product is realized; meanwhile, the preparation method has the advantages of energy source saving, high production efficiency, greenness and environment protection, no need of complicated post-treatment and the like; and the prepared rare earth oxidepowder has the advantages of high purity, small granularity and uniformity in distribution.