353 results about "Polyvinyl pyrrolidone" patented technology

The invention belongs to the technical field of catalysts, and particularly relates to an alumina-based catalyst for anthraquinone hydrogenation and a preparation method thereof.The preparation method comprises the following steps that 1, aluminum salt and PVP are added into deionized water, and an aluminum salt mixed solution is obtained; (2) adding ammonium salt and cyclic polysaccharide micromolecules into deionized water to obtain an ammonium salt mixed solution; (3) dropwise adding the aluminum salt mixed solution into the ammonium salt mixed solution while stirring, and performing aging, suction filtration, drying and calcination to obtain an alumina carrier; (4) impregnating the alumina carrier with a palladium salt solution; and (5) drying, roasting and reducing the impregnated alumina carrier to obtain the alumina-based catalyst for anthraquinone hydrogenation. Macromolecular PVP (Polyvinyl Pyrrolidone) and cyclic polysaccharide micromolecules are used as composite template agents for ammonium-aluminum coprecipitation, so that not only is an alumina carrier material with a high specific surface area prepared, but also the loading capacity on palladium is improved, the dispersion of palladium is promoted, and the hydrogenation efficiency is favorably improved.

The invention discloses an antibacterial drug delivery system based on a dynamic response type microneedle patch and a preparation method, and belongs to the field of biomedical materials.The antibacterial drug delivery system comprises a substrate layer and a needle point layer arranged on the surface of the substrate layer, the substrate layer is a mixed matrix of polyvinyl alcohol (PVA) and polyvinylpyrrolidone (PVP), and the needle point layer is made of nano-silver; the needle tip layer is a phenylboronic acid modified oxidized hyaluronic acid and polyvinyl alcohol composite system. The antibacterial drug delivery system based on the dynamic response type microneedle patch, namely the microneedle patch with the pH response drug release function, is suitable for antibacterial treatment of infectious wounds, the mechanical strength of the needle point layer is improved, it can be better guaranteed that a microneedle completely penetrates into the skin, and the delivery efficiency is improved; meanwhile, drug release can be responded according to the pH of a bacterial infection part, and the antibacterial effect is good.

The invention provides a preparation method of a liner-free all-composite pressure vessel. The preparation method comprises the following steps: compounding polyvinyl alcohol, dimethyl sulfoxide and polyvinylpyrrolidone into a core mold adhesive according to a preset proportion; the preparation method comprises the following steps: grading a filler by adopting various glass beads with different mesh numbers and chopped glass fibers according to a specific proportion, and then blending with a core mold adhesive according to a specific proportion to prepare a sand core material; a sand core material is pressed into the pretreated core mold, the surface of the sand core material is scraped to be flat after the sand core material is tamped, and core mold adhesive is coated for mold closing; the closed core mold is placed in a curing oven for curing operation, after curing is completed, natural cooling is conducted, demolding is conducted, and a core mold is obtained; uniformly winding a layer of carbon fibers on the surface of the core mold, and dissolving the core mold in a normal-temperature water area after curing; and continuously winding the carbon fibers by using the carbon fiber body as rigidity attachment until the carbon fibers are completely wound to obtain the liner-free pressure vessel. According to the method, the mechanical behavior requirement of an original core mold is greatly reduced, the dead weight of the core mold can be effectively reduced, and good manufacturability is achieved.

The invention provides a traditional Chinese medicine gel patch for treating gouty arthritis and a preparation method thereof. The traditional Chinese medicine gel patch for treating gouty arthritis comprises at least a gel layer loaded with traditional Chinese medicine extracts; the traditional Chinese medicine extracts comprise the following raw materials: coix seed, phellodendron amurense, clematis root, radix scutellariae, atractylodes lancea, radix ophiopogonis, radix scutellariae, acer scutellariae, radix scutellariae, radix aconiti kusnezoffii, radix strychnii, frankincense, myrrh, angelica sinensis, safflower, cyathula root, radix paeoniae rubra, radix smilacis gracile, radix striatae, eucalyptus glomeratae, sophora flavescens, andrographis paniculatae, radix lobeliae, rhizoma coptidis, radix scutellariae, cassia twig, zanthoxylum bungeanum, and borneol; and a matrix of the gel layer comprises the following raw materials in parts by weight: silk fibroin, polyvinyl pyrrolidone, azido-polyethylene glycol-carboxylic acid, 1-ethynylcyclopropylcarboxylic acid, 2,5-dicarboxylic acid-3,4-ethylenedioxythiophene, and glycerol. The traditional Chinese medicine gel plaster of the present invention can achieve good therapeutic effects through percutaneous absorption.

The invention discloses gallium ion-quercetin coordination nanoparticles (GQNPs) as well as a preparation method and application thereof, specifically, quercetin, gallium nitrate hydrate and polyvinylpyrrolidone are respectively dissolved in an absolute methanol solution to prepare a quercetin solution, a gallium nitrate hydrate solution and a polyvinylpyrrolidone solution; secondly, fully mixing the quercetin solution and the polyvinylpyrrolidone solution, dropwise adding the gallium nitrate hydrate solution, and rapidly changing the color of the mixed solution from faint yellow to orange yellow in the dropwise adding process; and finally, dialyzing the orange-yellow mixed solution to remove excessive gallium ions and polyvinylpyrrolidone, thereby finally obtaining the GQNPs. The prepared GQNPs and deferiprone show excellent treatment effects on cell and living body levels, are expected to be applied to treatment of Parkinson's disease through multi-dimensional anti-ferroptosis, do not show obvious toxic and side effects in the embodiment, and are expected to be applied to further preclinical research.

The invention discloses a method for preparing a micro-particle-size negative oxygen ion purifying agent from a nano material, and relates to the technical field of air purifying agents, the method comprises the following preparation steps: step 1, pouring 5-6.5 g of modified tourmaline powder and 10 g of an amino acid-nano particle compound into 200 mL of deionized water, then adding 0.5-0.54 g of polyvinylpyrrolidone, carrying out ultrasonic treatment for 30-40 min, then adding 0.5-0.54 g of polyvinylpyrrolidone into the deionized water, carrying out ultrasonic treatment for 30-40 min, and carrying out ultrasonic treatment for 30-40 min; carrying out ball milling until the particle size is 1-5 microns; 2, adding 2-2.6 g of a chitosan solution with the concentration of 1% after ball milling, adjusting the pH value of the system to 6, and stirring at 50 DEG C for 1 h; according to the method for preparing the micro-particle-size negative oxygen ion purifying agent from the nano material, tourmaline powder is modified, so that the surface hydroxylation degree of the tourmaline powder is improved, lattice defects are increased, the negative oxygen ion release efficiency is remarkably improved, meanwhile, the tourmaline powder is compounded with white carbon black, interface charge conduction can be enhanced, and continuous release of negative oxygen ions is further promoted.

The invention discloses a slow-release coal gangue and urea compound fertilizer and a preparation method thereof, and the specific method comprises the following steps: wetting coal gangue by using saponin, carrying out thermal modification on the coal gangue by using a hydrothermal method, fixing heavy metal ions in the coal gangue thermal modifier by using gelatin, and carrying out lecithin wrapping and ultrasonic action to obtain the slow-release coal gangue and urea compound fertilizer. And finally, mixing the reaction product of the coal gangue thermal modifier and gelatin and the reaction product of tannic acid and urea, preparing fertilizer particles under the bonding action of sodium carboxymethyl cellulose and polyvinylpyrrolidone, and performing microwave irradiation treatment to obtain the slow-release coal gangue and urea compound fertilizer. The method is ingenious in conception and simple in process and operation, the prepared compound fertilizer contains nitrogen and trace elements and has good slow release performance, the content of heavy metal ions meets the requirement for the limited quantity of toxic and harmful substances in the fertilizer, and the heavy metal ions are not prone to migration, so that the fertilizer is safe and wide in application range.

The invention discloses a carbon nanotube and silver nanowire co-loaded cotton fabric, a preparation method and application, a pretreated cotton fabric is placed in a silane coupling agent solution, and after soaking treatment, washing and drying are performed to obtain a modified cotton fabric; the preparation method comprises the following steps: acidizing carbon nanotubes, and dispersing the acidized carbon nanotubes in deionized water to obtain acidized carbon nanotube dispersion liquid; the preparation method comprises the following steps: mixing a reducing agent, ferric sulfate, silver nitrate, polyvinylpyrrolidone and water, heating to react, centrifuging, washing, and dispersing a product into deionized water to obtain AgNWs dispersion liquid; the modified cotton fabric is soaked in a CNTs / AgNWs dispersion liquid prepared from the acidified carbon nanotube dispersion liquid and the AgNWs dispersion liquid, and the modified cotton fabric is taken out and dried. The cotton fabric is modified through oxysilane, active groups are introduced to the surface of the fabric, and the binding force of the cotton fabric and a conductive material is enhanced. The surface of the fiber is coated with the carbon nanotubes, the silver nanowires are in lap joint to fill gaps, the carbon nanotubes and the silver nanowires form a continuous and complete conductive network on the surface of the cotton fabric, and the conductivity is improved.

The invention relates to a porphyrin-based iron metal organic framework (Fe-TCPP) catalyst for improving photoresponsiveness, which is characterized in that the Fe-TCPP nano catalyst is prepared by using an iron source and meso-tetra (4-carboxyphenyl) porphin (TCPP) as precursors through a simple solvothermal method, assisting coordination by virtue of polyvinylpyrrolidone (PVP), performing sealed reaction after ultrasonic dispersion, and preparing the Fe-TCPP nano catalyst. A purple suspension is obtained. And centrifuging, washing and drying to obtain the nano rod-shaped Fe-TCPP metal organic framework material. The Fe-TCPP catalyst prepared by the preparation method disclosed by the invention has a regular crystal structure and good dispersity, and can be stably coordinated to form a Fe-O cluster structure. The effective introduction of the TCPP enhances the charge transfer (LCCT) capability from the ligand to the metal cluster, effectively promotes the Fe (III) / Fe (II) circulation, and improves the photocatalysis-ozonation catalytic efficiency. The catalyst has the advantages of high thermal stability, less metal ion dissolution, good cycle performance and the like, and has wide application potential in the field of water treatment.

The invention is applicable to the technical field of toothpaste preparation, and particularly relates to mild stain-removing and whitening toothpaste containing diatomite and coconut shell carbon and a preparation method of the mild stain-removing and whitening toothpaste. The mild stain-removing and whitening toothpaste comprises 9-30% of Changbai Mountain diatomite abrasive, 32-38% of sorbitol, 2-4% of sodium lauroyl silicate, 2-3% of polyethylene glycol 400 and 0.5-2% of coconut shell carbon. The toothpaste is prepared from the following components in percentage by weight: 0.6 to 1 percent of polyvinylpyrrolidone, 0.5 to 0.8 percent of honeysuckle flower extract, 0.5 to 0.7 percent of pseudo-ginseng extract, 0.5 to 0.8 percent of xanthan gum, 0.1 to 0.2 percent of 1, 2-hexanediol, 0.5 to 0.8 percent of essence and water. The diatomite and coconut shell carbon used in the invention are refined natural food-grade raw materials, do not contain chemical components, have low hardness, are suitable for children and sensitive people, and do not damage enamel; the selected Changbai Mountain diatomite and coconut shell carbon with the iodine value of 1500-3000 have a synergistic effect, and the Chinese herbal medicine extract is added to assist in degerming; the adsorption, whitening and deodorizing capabilities of the toothpaste are greatly improved, and the toothpaste can quickly remove stains, whiten and remove bad breath.

A separator for an electrochemical device having a porous polymer substrate having a plurality of pores; and a porous coating layer formed on at least one surface of the porous polymer substrate. The porous coating layer includes a dispersing agent, a mixture of inorganic particles and a particle-type binder polymer, and a polyvinyl pyrrolidone binder polymer positioned on the whole or a part of the surface of the inorganic particles in the mixture of the porous coating layer to connect and fix the inorganic particles with one another. The content of the polyvinyl pyrrolidone binder polymer is 2 to 20 parts by weight based on 100 parts by weight of the total content of the particle-type binder polymer and the polyvinyl pyrrolidone binder polymer.

The invention relates to the technical field of preparation of alumina fibers, in particular to a method for preparing alumina synthetic fibers based on electrostatic spinning, which comprises the following steps: adding ZIF-8 into a mixed solvent to form a metal organic framework dispersion liquid, adding aluminum sec-butoxide to form a uniform precursor solution, and performing electrostatic spinning to obtain a precursor solution; adding the yttria-stabilized zirconia dispersion liquid into the precursor solution, and finally adding polyvinylpyrrolidone to obtain a composite spinning solution; and then carrying out electrostatic spinning, heat treatment and high-temperature sintering to obtain the alumina synthetic fiber. According to the preparation method, aluminum sec-butoxide is used as a precursor, ZIF-8 is used as a structure-directing agent, ordered arrangement of aluminum oxide nanoparticles is guided through a porous structure of the material, a more compact and ordered aluminum oxide crystal structure is formed, the internal structure of the fiber is more compact, meanwhile, it is ensured that the aluminum oxide nanoparticles are evenly dispersed in the fiber, and the performance of the fiber is improved. The crystallinity and the mechanical property of the aluminum oxide synthetic fiber are improved, and the overall uniformity and consistency are improved.

The invention particularly relates to a preparation method of a high-fluidity vortioxetine hydrobromide alpha crystal form. According to the technical scheme, vortioxetine hydrobromide is dissolved in an organic solvent with the volume being 5-10 times that of the vortioxetine hydrobromide, insoluble substances are filtered out, and polyvinylpyrrolidone with the mass being 1-2.5 times that of the vortioxetine hydrobromide is added into filtrate; and feeding the solution into pre-cooled purified water containing seed crystals for crystallization, filtering, and drying to constant weight. The obtained vortioxetine hydrobromide is in an alpha crystal form, is spherical, has the particle size of less than 15 microns and the specific surface area of more than 1600 m < 2 > / kg, and is high in dissolution rate, good in fluidity, high in yield and easy to industrialize.

Embodiments herein relate to lubricating coatings comprising polyacrylic acid for medical devices. In an embodiment, a medical device includes a lubricious coating having a substrate and a first layer disposed on the substrate. The first layer may include a photoreactive polyvinylpyrrolidone, a non-photoreactive polyvinylpyrrolidone, and a crosslinking compound. The second layer may be disposed on the first layer, the second layer may include poly (acrylic acid) and a non-photoreactive polyvinylpyrrolidone. The non-photoreactive polyvinylpyrrolidone of the second layer forms a composite with the poly (acrylic acid) of the second layer. The non-photoreactive polyvinylpyrrolidone of the second layer has a concentration that is present in a gradient in the thickness direction of the second layer, wherein the concentration at the outer surface of the second layer is lower than the concentration at the inner surface of the second layer. Other embodiments are also included herein.

The invention provides an adsorption material and a preparation method and application thereof, the adsorption material comprises a carrier and an endotoxin affinity binding ligand, the endotoxin affinity binding ligand comprises a recombinant C factor protein, and the carrier and the recombinant C factor protein are connected through a spacer arm; wherein the carrier comprises at least one of resin, chitosan, cellulose, agarose and glucan; the spacer arm comprises at least one of modified polyethylene glycol, polyvinyl pyrrolidone, polymethylacrylic acid-2-hydroxyethyl ester, polyvinyl alcohol, polyacrylic acid, hexamethylenediamine, divinyl sulfone and glutaraldehyde, and at least one end of the modified polyethylene glycol is provided with carboxyl, aldehyde or amino. The adsorption material provided by the invention can efficiently adsorb endotoxin, has the characteristics of low toxicity risk and excellent blood compatibility, and can improve the safety of blood purification.

The invention provides a tin-based perovskite thin film, a preparation method thereof and a tin-based perovskite solar cell, and belongs to the technical field of photovoltaic materials. The preparation method comprises the following steps: dissolving a tin-based perovskite raw material in an organic solvent, and adding polyvinyl alcohol or polyvinylpyrrolidone to prepare a tin-based perovskite precursor solution; and coating the tin-based perovskite precursor solution through a printing method to form a film, and carrying out annealing treatment to obtain the tin-based perovskite thin film. According to the invention, polyvinyl alcohol or polyvinylpyrrolidone is used to slow down the crystallization rate of perovskite, and is used as a template to provide heterogeneous nucleation sites, so that the defect state density is reduced, and the compactness of the perovskite film is improved.

The invention discloses a preparation method of a catalyst for ammonia borane hydrogen desorption by water based on efficient multifunctional active sites, which comprises the following steps: firstly, adding prepared MXene into deionized water to form a dispersion solution, then dissolving Co (NO3) 2.6 H2O and Ni (NO3) 2.6 H2O solutions into a polyvinylpyrrolidone solution, then adding the solution into the MXene solution to form a metal mixed dispersion solution, and finally adding the metal mixed dispersion solution into the MXene solution to form the catalyst for ammonia borane hydrogen desorption by water. The preparation method comprises the following steps: adding a NaBH4 solution into a tubular furnace to form CoB-Ni3B / MXene, calcining the CoB-Ni3B / MXene in the tubular furnace, and obtaining the CoB-NiCoP-Ni3B / MXene catalyst through a phosphorus induction method. According to the method, the preparation process is controllable, the defects that a noble metal-based catalyst is high in price and limited in resource in hydrogen production by hydrolysis of ammonia borane are overcome, and the problems that non-noble metal is easy to aggregate in the preparation process and the non-noble metal catalyst is low in activity and poor in stability in hydrogen production by hydrolysis of ammonia borane are solved.

The invention relates to a piezoelectric-piezoresistive collaborative mechanism-based sensor array and a preparation method and application thereof. The sensor array comprises a flexible packaging substrate layer, a piezoelectric layer, a piezoelectric layer and a piezoelectric layer which are sequentially integrated from bottom to top, the bottom electrode layer is composed of a stretchable silver electrode array subjected to silk-screen printing and serves as a lower electrode of the piezoelectric sensor; the piezoelectric functional layer is composed of a lead zirconate titanate-glass fiber composite film, and the piezoelectric functional layer is subjected to corona polarization treatment; the piezoresistive sensing layer is formed by spraying a polyvinylpyrrolidone modified carbon material dispersion liquid, the piezoresistive sensing layer is used as an upper electrode of the piezoelectric sensor, the piezoresistive sensing layer is directly deposited on the surface of the piezoelectric functional layer, and the piezoresistive sensing layer and the piezoelectric functional layer pass through a common electrode; and packaging a protection layer on the top layer. Compared with the prior art, the method has the advantages of high sensitivity, wide linear range and multi-parameter synchronous detection capability, high-resolution real-time deformation identification can be realized, and key technical support is provided for high-precision sensing application such as profile inversion.

The invention provides a polyurethane polishing pad and a preparation method thereof, the polyurethane polishing pad comprises a polyurethane mixture, the polyurethane mixture comprises a polyurethane prepolymer, a curing agent and a heat dissipation filler; in the polyurethane mixture, the mass percent of the polyurethane prepolymer is 50%-90%, the mass percent of the curing agent is 10%-30%, and the mass percent of the modified filler is 1%-10%; the water-soluble polymer compound system comprises polyvinylpyrrolidone, carboxymethyl cellulose and polyethylene glycol, the water-soluble polymer compound system is characterized in that the polyvinylpyrrolidone and the carboxymethyl cellulose are grafted to form a grafted copolymer, the grafted copolymer is compounded with the polyethylene glycol, and the mass ratio of the polyvinylpyrrolidone to the carboxymethyl cellulose in the grafted copolymer is 10: (1-2). The heat dissipation filler is added into the polyurethane, so that an effective heat dissipation effect can be achieved, the polishing uniformity is prevented from being affected by overheating of the polishing pad and the wafer, and the surface temperature of the polished wafer is moderate.

The invention discloses a printing antistatic polyester release film and a preparation method thereof, the release film is composed of a PET base film and a release agent layer firmly combined with the PET base film, the PET base film is formed by blending, melting, extruding and stretching PET particles added with a composite additive, and the release agent layer is formed by curing a release agent; wherein the composite additive is prepared from polyvinylpyrrolidone, graphene oxide, 3-aminopropyl triethoxy silane and polyvinyl butyral. The release agent is prepared from a polydimethylsiloxane-amino siloxane copolymer, fluorosiloxane resin, a quaternary ammonium salt type antistatic agent, isocyanate silane and a mixture of butyl acetate and methylbenzene. The composite additive provided by the invention not only can provide stable antistatic performance when being added, but also can further enhance the printing performance and the surface activity of the PET base film in the subsequent plasma treatment process, so that the composite additive is suitable for applications such as electronic product packaging, labels and the like which have high requirements on static electricity and printing performance.

The invention discloses a photocatalytic self-cleaning detergent and a preparation method thereof, and the photocatalytic self-cleaning detergent comprises the following components by weight: 5-10 parts of a TiO2-zeolite compound; 2 to 3 parts of parachlorometaxylenol; 5-8 parts of sodium citrate; 3-5 parts of sodium silicate; 1 to 2 parts of polyvinylpyrrolidone; 20 to 30 parts of a surfactant; 0.2-1 part of an enzyme preparation; 2-3 parts of a pH regulator; and 50-70 parts of water. According to the photocatalytic self-cleaning detergent disclosed by the invention, the absorption of ultraviolet rays is promoted through PCMX, so that the TiO2-zeolite compound is excited to generate active oxygen with strong oxidizing property, the degradation efficiency of the detergent on stubborn organic stains is improved, and the problems that TiO2 is poor in dispersity in the detergent and the illumination activation is limited are solved; stable release of the photocatalytic material in the washing process is achieved, the continuous and efficient cleaning effect is ensured, and the method can be applied to hospitals or industries and other scenes needing large-scale and deep cleaning.

The invention discloses an enamel material and a preparation method thereof, and belongs to the technical field of enamel materials, and the enamel material comprises the following components in parts by weight: 100 parts of basic glaze, 5-7 parts of lithium-based bentonite, 1.2-2.2 parts of a carbon nanotube composite material, 0.1-0.5 part of an auxiliary agent, and 55-65 parts of deionized water. Wherein concentrated nitric acid and polyvinylpyrrolidone are added into carbon nanotubes to obtain non-covalent modified carbon nanotubes, and then the non-covalent modified carbon nanotubes are sequentially coated with nano titanium dioxide and nano silicon dioxide through a sol-gel method to obtain the carbon nanotube composite material. The method for preparing the enamel material comprises the following steps: firstly, pretreating a steel plate, then putting the basic glaze, the lithium-based bentonite, the auxiliary agent, the carbon nanotube composite material and the deionized water into an ultrasonic cleaning machine for ultrasonic dispersion for 40-60 minutes, grinding for 3-5 hours, sieving to obtain enamel glaze slip, uniformly coating the pretreated steel plate with the obtained enamel glaze slip, and drying to obtain the enamel material. And sintering in a vacuum high-temperature sintering furnace at a heating speed of 3-3.4 DEG C / min, preserving heat, and cooling to obtain the enamel material.

The invention relates to a copper cluster scintillator constructed on the basis of diphenyl-2-pyridine phosphine and cuprous iodide and a preparation method and application of the copper cluster scintillator. The preparation method comprises the following steps: constructing a copper cluster scintillator by using diphenyl-2-pyridine phosphine and cuprous iodide, and preparing the copper cluster scintillator into a semitransparent scintillator film by using polyvinylpyrrolidone as a high-molecular polymer matrix and polyethylene glycol terephthalate as a spin-coating substrate; the scintillator film and a photomultiplier are optically coupled and integrated with nuclear electronics equipment to develop an alpha / beta particle pollution monitor. The copper cluster scintillator provided by the invention has excellent X-ray luminescence performance, and can realize high-sensitivity scintillation response to alpha / beta particles; the surface pollution monitor can realize sensitive detection of alpha / beta particles in the environment, and has important application value in the field of environmental radiation detection.

The application discloses a kind of thermistor material production methods, comprising the following steps: after Mn3O4, NiO, Co3O4, modified Al2O3, Fe2O3, polyvinyl pyrrolidone are mixed, first ball mill is obtained in ball mill;First ball mill is placed in tube furnace, under inert gas atmosphere, after heating to 950~1000 DEG C calcination 2.0~2.5h, after cooling, calcined powder is obtained;Second ball mill is obtained by placing calcined powder into ball mill;Second ball mill, 2,5-furandimethanol, casein are mixed and placed into forming mold and pressed into green compact;Green compact is placed into muffle furnace, first calcined at 750~800 DEG C for 1.0~1.5h, then heated to 1100~1150 DEG C and calcined for 2.5~3h to obtain thermistor material.The application mixes Al2O3, MgO, La2O3 uniformly in proportion, then places them in plasma equipment for processing and vacuum calcination to obtain modified Al2O3, which is added to thermistor material, thereby improving the sensitivity and stability of thermistor material, and having wide application prospect.

The invention belongs to the field of nanometer materials, and particularly discloses an ultrathin platinum-based hollow nanorod with the wall thickness smaller than 4 nm and a preparation method and application of the ultrathin platinum-based hollow nanorod. The preparation method comprises the following steps: adding a tellurium precursor and a selenium precursor into a solution containing a reducing agent, continuously magnetically stirring, and then carrying out solid-liquid separation to obtain the tellurium-selenium nanorod, then adding a hydrogen peroxide solution into an aqueous solution containing an intermediate product, carrying out a reaction for a preset time, carrying out solid-liquid separation after the reaction is finished so as to obtain a precipitate, and finally, preparing the ultrathin platinum alloy hollow nanorod. If other noble metal precursors are not added when the platinum precursor is added, the ultrathin platinum hollow nanorod can be obtained. The reaction rate of the noble metal precursor and the tellurium-selenium template is controlled mainly through ethylene glycol and polyvinylpyrrolidone, and the unreacted tellurium-selenium template is removed through hydrogen peroxide etching, so that the prepared ultrathin platinum-based hollow nanorod has the wall thickness smaller than 4 nm.

The invention discloses a NiCo-LDH / porous carbon composite material with expanded interlayer spacing as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing coal pitch serving as a carbon source with potassium hydroxide, combusting in an inert gas atmosphere, and performing acid pickling, suction filtration and drying to obtain a coal pitch-based porous carbon material; the preparation method comprises the following steps: uniformly dispersing a certain amount of porous carbon material in a mixed solution of nickel nitrate hexahydrate, cobalt nitrate hexahydrate, polyvinylpyrrolidone (PVP) and ethylene diamine tetraacetic acid (EDTA-2Na), performing hydrothermal reaction, adding hydrazine hydrate (N2H4H2O), and performing hydrothermal reaction again to obtain the nickel-cobalt layered double hydroxide / porous carbon composite material (NiCo-LDH-PC) with expanded interlayer spacing. Compared with the prior art, the method has the advantages that the interlamellar spacing of NiCO-LDH is regulated and controlled, the interlamellar spacing is enlarged, and the NiCO-LDH has excellent electrochemical performance and cycling stability as an electrode material of a supercapacitor and a button cell.

The invention discloses a hydrophilic coating as well as a preparation method and application thereof, and belongs to the technical field of coating materials. The hydrophilic coating comprises a base coating and a lubricating coating attached to the base coating, the thickness of the base coating is 0.1-120 [mu] m, and the thickness of the lubricating coating is 0.1-100 [mu] m. The lubricating coating is prepared from the following components in percentage by mass: 10 to 20 percent of thiolated hyaluronic acid, 40 to 50 percent of sodium hyaluronate, 10 to 20 percent of sulfobetaine, 5 to 10 percent of ethanol and the balance of water. 100 parts by mass of the substrate coating comprise the following components: 25-35 parts of polyimide, 5-15 parts of polyvinylpyrrolidone, 5-8 parts of modified chitosan, 1-3 parts of a cross-linking agent and the balance of a solvent. According to the hydrophilic coating provided by the invention, the defects in the prior art are successfully overcome through a specific multi-layer structural design and a specific material ratio, and the prepared hydrophilic coating has excellent hydrophilicity, lubricity and adhesive force.

The invention discloses a jet printing visual food freshness label and a manufacturing method and application thereof. The manufacturing method of the visual food freshness label comprises the following steps: firstly, preparing the metal nanocluster; the obtained metal nanocluster dispersion system is compounded with polyvinylpyrrolidone, and the ink is formed through ultrasonic dispersion and heat treatment; mixing a solvent with polyvinylpyrrolidone to obtain a regulating agent; the ink and the regulating agent are injected into independent ink boxes of an ink-jet printer respectively, patterns are deposited on a low-fluorescence background substrate through preset printing parameters, and the patterns are sealed and stored after being dried. Compared with other intelligent indication labels, the fluorescent intelligent label prepared by the invention has the remarkable advantages of low cost, high stability, uniform luminescence and capability of realizing large-scale and rapid preparation; and in the preparation process of the label, the use amount of the metal nanocluster solution can be greatly reduced, so that a more environment-friendly and green production mode is realized.

The invention relates to an external degradable microneedle patch as well as a preparation method and application thereof, and belongs to the technical field of biological medicines. The preparation method comprises the following steps: S1, preparing powdery CS-TA; s2, preparing a powdery Cu-TA nano enzyme; s3, adding the Cu-TA nano-enzyme and glucose oxidase GOD into water, stirring at 1-4 DEG C in an inert gas atmosphere, centrifuging, and re-suspending in water to obtain a GOD-coated Cu-TA compound enzyme solution; s4, adding CS-TA, hyaluronic acid, polyvinylpyrrolidone, L-arginine and a basic fibroblast growth factor into the GOD (at) Cu-TA compound enzyme solution, and preparing a microneedle mother solution; s5, preparing an aqueous solution containing CS-TA, hyaluronic acid and polyvinylpyrrolidone to obtain a substrate mother solution; and S6, filling a microneedle mold cavity of a mold with the microneedle mother solution to form enzyme series microneedles arranged in an array, then pouring a substrate mother solution to form a substrate, drying, and demolding to obtain the external degradable microneedle patch.

The invention relates to a sodium propionate-containing hydrate inhibitor for guaranteeing flow of a carbon dioxide conveying pipeline, which comprises sodium propionate, glycine, polyvinyl pyrrolidone and methanol, and the sodium propionate, the glycine, the polyvinyl pyrrolidone and the methanol are mixed with a sodium chloride solution serving as a solvent, so that the sodium propionate, the glycine, the polyvinyl pyrrolidone and the methanol are mixed according to the molar percentage as follows: 1-15 mol% of the sodium propionate, 1-15 mol% of the glycine, 0.1-1 mol% of the polyvinyl pyrrolidone and 5-60 mol% of the methanol. The sodium propionate, the glycine, the polyvinyl pyrrolidone and the methanol are compounded for use, so that the effect of a single inhibitor is enhanced, the application range is wider, a better inhibition effect is achieved at a lower concentration, and the generation of carbon dioxide hydrate can be better inhibited. The mixed use reduces the cost of the inhibitor, reduces the use amount of the mixture, and weakens the toxicity and pollution of the inhibitor.