345results about How to "Potential application value is good" patented technology

The invention discloses a preparation method for monophosphate-adjuvant water-soluble fluorescent carbon quantum dot solid powder, which belongs to the technical field of nanometre materials. The preparation method comprises the following steps of: by taking soluble phosphate solution as an adjuvant, taking saccharides, amino acids and some low-molecular-weight organic matters containing hydroxyl and carboxyl as reaction precursors and adopting a microwave heating means, directly preparing solid carbon quantum dot powder in one step; and adding an appropriate amount of ethanol aqueous solution to precipitate and removing most of salts, then performing further purification by virtue of strong-base anion exchange resin and strong-acid cation exchange resin sequentially, centrifuging and then performing rotary evaporation on the supernatant, so as to obtain the purified carbon quantum dot solid powder. The carbon quantum dots prepared by the preparation method disclosed by the invention are good in solubility in water, and solid powder samples can be stored for a long time; meanwhile, the obtained carbon quantum dots further are also excellent in water solubility and fluorescence characteristic. The whole preparation process is simple to operate, requirements on equipment are low, and raw materials are low in cost, wide and easily available; the preparation method is an environment-friendly preparation method for carbon quantum dots.

The invention discloses a tomato S1lPIF4 gene, protein and application thereof to improving the low temperature resistance of plant. The nucleotide sequence of the S1lPIF4 gene is SEQ ID NO.1, and thecorresponding amino acid sequence is as shown in SEQ ID NO. 2. A tomato SlIPIF4 overexpression plant or a gene knockout plant through the gene means to regulate the expression level of the S1lPIF4 gene in order to do research on the regulatory mechanism of the S1lPIF4 gene on the low temperature resistance of tomato. According to the result, overexpression of S1lPIF4 at the lower temperature canpromote accumulation of plant hormone abscisic acid (ABA) and jasmonic acid (JA), inhibits accumulation of gibberellin (GA), further induces expression of the low temperature resistant gene of the tomato, and finally improves the low temperature resistance of the tomato. Therefore, the S1lPIF4 gene of the tomato enhances the low temperature resistance by inducing formation of hormones ABA and JA in the body. The tomato S1lPIF4 gene provides the gene resource for breeding new varieties of low temperature resistant tomato, has the good potential application value, and lays theoretical basis fordoing research on tomato plant distress response signal mechanism and molecular mechanism of being tolerant to adverse environment.

The invention relates to a method for preparing micro-fibrillated nanocellulose by use of degummed ramie. The degummed ramie is used as a raw material and is crushed into short fibers by a physical-mechanical method, then the short fibers are soaked with distilled water, and then are prepared into cellulose pulp by a beating machine; the cellulose pulp is ground continuously in a reciprocating manner by an ultra-fine refiner to enable the cellulose to be stressed in a refining manner to obtain suspension liquid; and finally, the nanocellulose and water are separated by a centrifugal washing method, and drying is carried out by a vacuum freezing method to finally obtain the powdery micro-fibrillated nanocellulose. The method is simple, has high efficiency, raw material price is low, no chemical agent needs to be added, the energy consumption is low, pollution is slight, the control is easy, and the prepared micro-fibrillated nanocellulose has high yield, good repeatability and good performances and has important scientific significance and considerable application prospect.

The invention discloses a four-needle shaped zinc oxide crystal whicker of functional coating layer and preparation method thereof, comprising the steps of coating product prepared by high temperature cracking reaction containing metal organic silicon polymer on surface of the four-needle shaped zinc oxide crystal whicker. The prepared four-needle shaped zinc oxide crystal whicker of functional coating layer can not only obtain conduct crystal whicker or magnetic crystal whicker, but also maintain the four-needle structure of the crystal whicker to maintain regularity of the shape and consistency of the size, characterized in high intensity, high modulus, high temperature resistance and so on. The invention has great potential application value in the fields of anti-static, electric-magnetic screen, radar absorbing and so on.

The invention belongs to the field of materials, and specifically relates to a perovskite nanosheet material as well as a preparation method and application thereof. The preparation method of the perovskite nanosheet material comprises the following steps: (1) mixing cesium carbonate powder with octadecene and oleic acid, dissolving the cesium carbonate powder by heating to 100-130 DEG C under aninert atmosphere, rising the temperature of a system to 140-160 DEG C and reacting for 10-60 min to obtain a cesium oleic acid precursor; mixing iron bromide power with octadecene, oleic acid and oleylamine, dissolving, then adding lead bromide power into an obtained mixed solution, and dissolving the lead bromide powder by heating to 100-120 DEG C under an inert atmosphere so as to obtain an ironand lead mixed solution; and (2) heating the cesium oleic acid precursor to 80-100 DEG C, uniformly mixing with the iron and lead mixed solution, performing a thermal insulation reaction for 5 s-5 min at 120-140 DEG C, cooling and then performing centrifugal separation. Therefore, the obtained perovskite nanosheet material has relatively short light-emitting wavelength; the light-emitting peak position is at about 436 nm; the half peak width is only 14 nm; the light-emitting peak is fully symmetric; and the two-dimensional perovskite nanosheet material is very uniform in size and thickness, and is easy to control.

The invention provides a method for measuring a cadmium isotope ratio in rice by using a multi-receiving inductance coupling plasma mass spectrum. The method comprises the following steps: 1, performing microwave digestion on a rice sample to measure the content of total cadmium; 2, performing microwave digestion on the rice sample to measure the content of total cadmium in a separated and purified rice sample, thereby obtaining a separation and purification rate; 3, performing microwave digestion on a to-be-measured rice sample, and performing separation and purification to obtain to-be-measured liquid; and 4, measuring the cadmium isotope ratio in the to-be-measured liquid by using the multi-receiving inductance coupling plasma mass spectrum, wherein the separation and purification process specifically comprises the following steps: a, converting a nitric acid medium of a digestion solution into a hydrochloric acid medium; b, leaching the digestion solution of the hydrochloric acid medium for five times by using hydrochloric acid, and then leaching for two times by using Milli-Q water to obtain a leachate; c, eluting and collecting the leachate; and d, converting an eluting solution into a nitric acid medium from a hydrochloric acid medium. By adopting the method provided by the invention, the technical problem of separating and purifying cadmium from a rice sample low in cadmium content is solved, and a cadmium pollution source can be quickly and accurately restored, so that the method has a good application value.

The invention provides a method for determining microcystic toxins concentration and is based on that molybdenum disulfide quantum dots can interact with gold nanoparticles through the internal filtration effect. Microcystic toxins can affect the degree of aggregation of aptamer-modified gold nanoparticles in the high salt solution, and detection of the microcystic toxins concentration in the water environment is achieved. The method is advantaged in that upconversion fluorescence of the molybdenum disulfide used can effectively avoid interference of background matrix fluorescence in the waterenvironment, optical stability is good, the detection result is accurate and reliable, cost is low, operation is simple, environmental protection is realized, detection specificity is good, influenceof other common metal ions or anions on determination of the microcystic toxins is avoided, the anti-interference ability is strong, the result is sensitive and reliable, the detection limit is low,the response speed is fast, the entire reaction process takes only 20 minutes, detection efficiency is greatly improved, good stability is achieved, real-time online fast, specific detection can be realized, and the method can be used for simple and rapid detection of microcystic toxins in the actual water environment.

The invention relates to the field of a lithium ion capacitor, in particular to a method for lithium pre-embedment of a negative electrode of the lithium ion capacitor. The method comprises the following steps of preparing active paste of the negative electrode, and applying the paste onto a porous copper foil through which lithium ions can pass to prepare a negative pole plate; attaching a layer of low-cost lithium-containing material lithium sheet or a lithium foil on the back surface of the negative pole plate to prepare the negative pole plate capable of lithium embedment; preparing the lithium ion capacitor by the negative pole plate capable of lithium embedment; and enabling the lithium sheet attached onto the back surface of the negative electrode to be spontaneously embedded into a negative electrode material during the formation of the capacitor so as to complete the lithium pre-embedment of the negative electrode of the lithium ion capacitor. The method is simple and convenient, is low in cost and has very important significance to industrial production of the lithium ion capacitor.

The invention relates to a preparation method of an amphiphilic Janus hierarchical pore microcapsule with an opening structure. The preparation method comprises the following steps of performing occupying modification on the outer surfaces of core/shell composite microspheres; then, swelling the core/shell composite microspheres to form the anisotropic composite microspheres with bulges, and dissolving by a good solvent to remove a template, so as to form a microcapsule with the opening structure; finally, performing different functionalizing on the inner surfaces of the microcapsules, so as to obtain the microcapsule material with the hydrophilic inner surface and the hydrophobic outer surface, or the hydrophobic inner surface and the hydrophilic outer surface. The prepared microcapsule material has excellent biological compatibility, good organic solvent-resistant property, chemical corrosion-resistant property and high mechanical stability, and has huge potential application value in the fields of micrometer-nanometer reactors, load catalyzing and the like.

The invention discloses a high-yield phosphorous-doped porous carbon material and a preparation method thereof. The yield of porous carbon is higher than 60 percent. The preparation method of porous carbon comprises the following steps: under a non-oxidization condition, calcining metal phytate to obtain a precursor; then treating with acid; carrying out water washing; centrifuging and collectingsediment; drying to obtain the phosphorous-doped porous carbon material. The phosphorous-doped porous carbon with high yield is directly prepared through one-step pyrolysis of potassium/sodium phytate; the porous carbon has micropore and mesoporous structures; the preparation method is simple, green and environmentally friendly; the production cost is low and the yield is high; the preparation method is very suitable for large-scale production; the high-yield phosphorous-doped porous carbon material has a huge potential application value in a plurality of fields including water treatment, pollutant adsorption, super-capacitors, fuel cells, lithium-sulfur batteries and the like.

The invention discloses a WRKY20 protein and application of an encoding gene thereof in regulating stress resistance of plants. The WRKY20 protein disclosed by the invention is a protein as shown in A1), A2), A3) or A4), wherein A1) is a protein, the amino acid sequence of which is a sequence 4, A2) is a protein, the amino acid sequence of which is a sequence 13, A3) is a protein, the amino acid sequence of which is a sequence 14, and A4) is a protein, the amino acid sequence of which is a sequence 21. Experiments verify that reduction of the WRKY20 protein content plays a role of improving resisting cotton bollworm, two-spotted spider mite and aphids and increase of the WRKY20 protein content plays a role of preventing bemisia tabaci, fungal diseases and geminivirus for plants, thereby providing a gene resource for culturing new species of insect-resistant and/or anti-disease plants. The protein has relatively good potential application value.