193results about How to "Strong repeatability" patented technology

The invention provides a preparation method of a low-conductivity flake graphene composite material, a low-conductivity flake graphene composite material prepared by the method and application of the low-conductivity flake graphene composite material in preparing an anticorrosion coating. The method comprises the following steps: reacting graphene oxide with aniline, HCl and ammonium persulfate to obtain a polyaniline/graphene oxide composite material, reducing the graphene oxide in the composite material with KOH, and meanwhile, removing the polyaniline. The low-conductivity flake graphene composite material is applicable to preparing an anticorrosion coating. The oxidation-state polyaniline is introduced into the graphene surface to lower the conductivity of the graphene and enhance the corrosion resistance of the coating, and the graphene can not generate adverse interaction on the matrix after losing efficacy; the flake graphene has favorable spreading rate on the coating matrix; and the preparation process is simple, can easily implement industrialization, and has wide application prospects.

The invention discloses a corn stalk compound substrate suitable for soilless culture of vegetables and a preparation method thereof. The compound substrate comprises 8 volume parts of corn stalks and 2 volume parts of river sand. Various indexes of the compound substrate disclosed by the invention meet requirements on growth and development of the vegetables and reach a standard of soilless culture substrates; organic components account for about 80%, the service life reaches 2-5 years or longer, and the cost of the corn stalk compound substrate is reduced by 60-80% compared with that of conventional substrates, for example, 80% compared with that of rock wool, 75% compared with that of vermiculite, 75% compared with that of cocoanut shells, 70% compared with that of grass carbon, and 60% compared with that of perlite. The corn stalk compound substrate achieves recycling of stalks, saves natural resources, and provides an effective development outlet for protection of ecological environments.

The invention discloses a manufacturing method of a porous microneedle array based on metal sintering. The manufacturing method comprises the following steps that firstly, base mixed liquor is prepared and poured into a base mold, and the bottom of the base mold is provided with multiple conical holes used for manufacturing microneedles; secondly, the base mold with the base mixed liquor poured in the first step is aerated and dried, and a microneedle array obtained after drying and molding are conducted is taken out of the base mold; and thirdly, the microneedle array obtained in the second step is sintered, so that the metal porous microneedle array is obtained. By the adoption of the manufacturing method of the porous microneedle array based on metal sintering, the technology is simple, the structure is stable and the metal strength is high.

The invention discloses a noncellular synthetic biology based preparation method of 2-phenylethanol and an application. According to the preparation method and the application, three recombinases including ARO8, ARO10 and ADH1 are utilized to constitute a co-reaction system, and a complicated metabolic process of an Ehrlich pathway requiring multi-step continuous reaction and multi-enzyme participation for synthesis of 2-phenylethanol in microorganisms is simplified to be performed in the same reaction system in vitro, so that the environmental pollution is reduced and the reaction process is shortened. Furthermore, the three recombinases are subjected to carrier-free co-immobilization with glutaraldehyde serving as a cross-linking agent, Combi-CLEAs (Combi-Cross-linked Enzyme Aggregates) are prepared, a target product is synthesized in vitro, accordingly, the enzymes are further recycled on the basis of the beneficial effects, and the production cost is reduced; the preparation method fills up the technical blank of multi-enzyme preparation of 2-phenylethanol in vitro, and important reference is provided for biological preparation of 2-phenylethanol.

The invention discloses a HPLC (High Performance Liquid Chromatography) analysis method for sodium 3,3'-dithiodipropane sulfonate and belongs to the technical field of analysis. The HPLC analysis method is characterized in that a high performance liquid chromatograph with an ultraviolet detector is used for determining; octadecyl silane is taken as a filling column, the size of a chromatographic column is 250mm (length)*4.6mm (inner diameter) and the grain size is 5 microns; methyl alcohol and a buffer solution in volume ratio of (0-50):(100-50) is taken as a flowing phase; the detection wavelength is 190-330nm, and the column temperature is at 10-60 DEG C; the speed of the flowing phase is 0.3-1.2mL/min; the feeding size of a sample is 20 micro liter; the buffer solution contains 0.17mol/L acetic acid, 0.142mol/L triethylamine and ultrapure water. The content of sodium 3,3'-dithiodipropane sulfonate in a to-be-detected sample can be quickly and accurately measured according to a standard curve established via a standard solution; the determination result error is small; the repeated operability is strong; the precision is less than 2.8%; the recovery rate is 96.7%-99.3%; the HPLC analysis method can be widely applied to the production process detection and product quality detection for industrial sodium 3,3'-dithiodipropane sulfonate.