32results about How to "Simple preparation steps" patented technology

The invention relates to the field of cosmetics, in particular to skin moistening oil containing a water-soluble active matter and a preparation method of the skin moistening oil. The skin moistening oil of the water-soluble active matter is prepared from the following raw materials in parts by mass: 0.1-1 part of a phase A, 3-15 parts of a phase B and 80-100 parts of a phase C, wherein the phase A is a water-soluble component, and the water-soluble component comprises one or more of deionized water, VC ethyl ether and nicotinamide; the phase B is a solvent, and the solvent comprises one or more of ethyoxyl diethylene glycol, 1, 2-pentanediol, isopentanediol and isostearic acid; the phase C is skin moistening oil, and the skin moistening oil comprises caprylic / capric triglyceride. The skin moistening oil product provided by the invention has the advantages of clear and transparent appearance, good fluidity, excellent stability, no need of adding a surfactant or a solubilizer, mildness, no irritation, simple process, controllable cost, good practical value and good application prospect.

The invention relates to a preparation method and application of selenium-doped carbon quantum dots. The selenium-doped orange fluorescent carbon quantum dots are successfully prepared by treating a mixture of mangosteen peel, ethanol and sodium selenite through a hydrothermal method. Based on the excellent fluorescence property of the carbon quantum dots, the Cr < 2 + > can quench the fluorescence of the selenium-doped carbon quantum dots, so that the Cr < 2 + > can be detected. Meanwhile, the carbon quantum dot is found to be responsive to disease micromolecule glutathione, that is, glutathione can enhance fluorescence of the carbon quantum dot. By utilizing the concentration difference of glutathione in normal cells and cancer cells, the carbon quantum dots can realize the recognition of tumor cells. The orange fluorescent carbon quantum dot provided by the invention is prepared from easily available raw materials, and is safe and non-toxic. The prepared carbon quantum dot has stable fluorescent property, uniform particle size of 4.2 + / -0.5 nm, and relative quantum yield of 34.35%, can be imaged in cells, has GSH detection limit of 27.16 umol / L, and can identify tumor cells and normal cells.

This invention discloses a glass powder for the main grid paste of TOPCon crystalline silicon solar cells and its preparation method. The glass powder is obtained by mixing glass frits A and B obtained after cold rolling at a mass ratio of 1.5 to 2:1, followed by secondary melting and cold rolling. Glass frit A includes PbO, SiO2, B2O3, Li2O, Na2O, etc., and glass frit B includes Bi2O3, SiO2, AgNO3, B2O3, Li2O, Na2O, etc. Distilled water is added to glass frit B during the batching process to fully combine AgNO3 with other oxides, and the mixture is dried to a viscous state before sintering. During the sintering process, laser-enhanced contact optimization technology is used to reduce AgO in the glass to silver microcrystals, thereby improving the electrical performance of the main grid lines. The printed solar cells exhibit reduced damp heat decay, resulting in high module reliability and improved photoelectric conversion efficiency while ensuring high welding tensile strength. The resulting glass powder does not excessively etch the silicon nitride and aluminum oxide passivation layers, and the prepared slurry can be sintered at 650-800℃, which can meet the requirements of the front and back main grid electrodes of TOPCon batteries.

The application provides a pyridyl-containing covalent organic framework fiber composite film and a preparation method thereof. The preparation method comprises the following steps: mixing an amine monomer solution and an aldehyde monomer solution to perform a condensation reaction, obtaining a first mixed solution, and obtaining pyridyl-containing covalent organic framework nanoparticles after centrifugation; wherein the aldehyde monomer solution is obtained by mixing an aldehyde monomer and an acetic acid solution, and the amine monomer solution is obtained by mixing an amine monomer containing pyridyl groups and water; mixing the pyridyl-containing covalent organic framework nanoparticles and a nanocellulose solution to obtain a second mixed solution containing covalent organic framework nanocellulose; and performing film forming treatment on the second mixed solution to obtain the pyridyl-containing covalent organic framework fiber composite film. The covalent organic framework nanoparticles are combined with nanocellulose, the high crystallinity and pore characteristics of the covalent organic framework are retained, and the mechanical strength of the composite film is improved by using the mechanical properties of nanocellulose.

This application discloses a dPCR chip and its preparation method, relating to the field of biotechnology, which simplifies the preparation process and reduces preparation costs. A dPCR chip includes: a substrate; and a base adhesive disposed on one side of the substrate. The base adhesive includes a plurality of pores arranged in a non-array configuration on the base adhesive, the pores being obtained by dissolving exposed particles mixed in the base adhesive.

The application provides a preparation method and a centering device of a size-controllable ultrathin high-quality echo wall optical crystal microcavity, and the method comprises the following steps: cutting a crystal material into a wafer and grinding and thinning the crystal thickness by using a polishing disc; placing an optical crystal microcavity blank on a microscope stage, adjusting two-dimensional adjustment knobs of the stage, and making the center of the optical crystal microcavity blank coincide with an origin of an objective micrometer scale; making a clamping rod with an adhesive adhered to a bottom end penetrate a top end through hole of a clamping rod fixing frame, and making the clamping rod align with the origin of the objective micrometer scale; adjusting the height of the clamping rod, making the optical crystal microcavity blank be pasted and fixed on the bottom end of the clamping rod by ultraviolet curing glue, and completing centering; taking the clamping rod off the clamping rod fixing frame, chamfering an outer circle of the optical crystal microcavity blank; grinding the outer circle surface of the optical crystal microcavity wafer by using sandpaper; polishing the optical crystal microcavity wafer, and obtaining the optical crystal microcavity based on the polished optical crystal microcavity wafer.

The present application relates to a resonator and a manufacturing method thereof. The resonator comprises an interdigital transducer. The interdigital transducer comprises a bus bar unit and an interdigital electrode unit. The bus bar unit comprises two bus bars opposite in a first direction. The interdigital electrode unit is located between the two adjacent bus bars. In the first direction, the area between the two bus bars is configured as a plurality of acoustic channels based on the interdigital electrode unit. The part of the interdigital electrode unit located in each acoustic channel constitutes an interdigital electrode group. Wherein, the structure of any two adjacent interdigital electrode groups is different. And the resonant frequency of the main mode in the plurality of acoustic channels is the same. The working performance of the resonator is stable, and the excitation position and strength of the spurious wave generated in the working process of the resonator are dispersed, so that the out-of-band suppression performance of the resonator is effectively improved. And the structure of the interdigital electrode in the resonator and the structure of the interdigital electrode group can be flexibly adjusted based on actual needs. The manufacturing method is simple and easy to implement.

The application discloses a kind of sodium ion battery hard carbon negative electrode material and preparation method thereof, belong to carbon material synthesis and electrochemistry technical field.The hard carbon negative electrode material is the material of animal hair biological substance after being prepared by pre-oxidation treatment, inert atmosphere pyrolysis, uniform speed cooling and crushing treatment.The application determines the corresponding relationship between the interlayer spacing, micropore quantity and surface oxygen-containing group of animal hair biological substance fiber under pre-oxidation-inert atmosphere temperature pyrolysis, sodium storage capacity and cycle stability, and the hard carbon negative electrode based on rabbit hair prepared by optimal condition realizes 265.30mAh g ‑1 The sodium storage specific capacity of 50mA g ‑1 Current density is 300 cycles after 88.55% capacity retention rate.The low-cost large-scale preparation scheme of hard carbon negative electrode material proposed by the application can be industrialized and popularized, which provides technical reference for the industrialization development of sodium ion battery.

The application provides a preparation method and application of a metallocene polypropylene catalyst. The first aspect of the application provides a preparation method of a metallocene polypropylene catalyst, comprising the following steps: subjecting a carrier to a thermal activation treatment to obtain a thermally activated carrier; loading a first cocatalyst on the thermally activated carrier to obtain a thermally activated carrier after loading of the first cocatalyst; preparing a catalyst precursor by using a second cocatalyst, a metallocene compound and an indole compound; and reacting the thermally activated carrier after loading of the first cocatalyst with the catalyst precursor to obtain the metallocene polypropylene catalyst. The preparation method of the metallocene polypropylene catalyst can effectively improve the activity and stereoregularity of the metallocene polypropylene catalyst by adding an electron donor of the indole compound to modify an active center in the preparation process of the metallocene polypropylene catalyst; and meanwhile, the preparation process is simple, and the types of chemical reagents used are few.

The present application belongs to the technical field of solid phase extraction, and particularly relates to a solid phase extraction membrane based on a defective MOF as well as a preparation method and application thereof. The solid phase extraction membrane based on the defective MOF comprises a carrier and a coating layer loaded on the surface of the carrier; the composition of the coating layer comprises a defective amino MOF material; the defective amino MOF material is prepared by taking a metal as a center, taking 3,5-dibromo-4-hydroxybenzaldehyde as a template molecule, and reacting with an amino organic ligand. By adopting a specific template molecule, the defective MOF structure has pores that are matched with the shape and size of the template molecule, has strong adsorption capacity for structural analogues of the template molecule, has strong selectivity for target analytes, can highly selectively enrich chlorophenol, and makes the solid phase extraction membrane have excellent adsorption effect on chlorophenol, high enrichment multiple and good reproducibility.

The utility model provides a kind of intelligent ring with slot antenna structure, and the electrically conductive ring body is provided with ring gap, and the ring gap makes the electrically conductive ring body form non-closed geometric path, and the electrically conductive ring body is respectively fixed with a plurality of redundant protruding parts on the first cross section and the second cross section formed by the ring gap, and the electrically conductive ring body and the protruding part are made of integrated molding technology, and the inner wall surface of the electrically conductive ring body is provided with a receiving chamber extending along the bending direction of the electrically conductive ring body, and the antenna assembly is arranged inside the receiving chamber, and the filling part is made of non-conductive material, and the filling part is embedded in the ring gap, and is fixedly connected with the protruding part and the cross section of the electrically conductive ring body. Through the utility model, under the premise of ensuring the closed body of the intelligent ring, the antenna signal output function is realized, and the connection stability between the electrically conductive ring body and the filling part is effectively improved, and the overall structural strength of the intelligent ring is further improved.

The invention discloses a construction method and application of a self-assembled air bag of a targeted inflammatory factor. The construction method comprises the following steps: carrying out engineering modification on an air bag gene sequence, so that protein on the outer surface of the air bag is directionally fused, and expressing an oligopeptide affinity tag; designing a bispecific nano antibody gene sequence; co-transforming a balloon gene and a bispecific nano antibody gene into a host cell to realize self-assembly; and crushing the host cells which successfully express the self-assembled air bag, and carrying out centrifugal separation to obtain the self-assembled air bag of the targeted inflammatory factor. According to the invention, the self-assembled airbag of a biological source is prepared in a pure biosynthesis mode, high targeting to inflammatory factors can be realized without chemical modification of the airbag again, the airbag has good biocompatibility and can specifically target to inflammatory lesions, and through ultrasonic echo signals generated by gas in the airbag, the self-assembled airbag can be used for detecting the inflammatory lesions. The medical image contrast of an inflammation part is obviously enhanced, and the key problem that early inflammation focus imaging is difficult is effectively solved.

The application discloses a method for applying photo-thermal orthogonal regulation color-changing fluorescent polymer hydrogel to temperature monitoring and anti-counterfeiting, using phase change materials, thermochromic molecules and photochromic molecules as raw materials, a series of photo-thermal orthogonal regulation color-changing fluorescent polymer capsules are prepared by adopting an emulsion-solvent evaporation method, then the prepared capsules are dispersed in hydrogel to prepare photo-thermal orthogonal regulation color-changing fluorescent polymer hydrogel, and the prepared hydrogel is used for temperature monitoring and anti-counterfeiting under photo-thermal orthogonal regulation after arrangement and combination. The prepared color-changing fluorescent polymer hydrogel has fast photoresponsivity and thermal responsivity, excellent light switching performance and high fluorescent contrast, a relatively narrow temperature response interval, temperature response sensitivity, and a simple preparation process, and has great application potential in the fields of data encryption, anti-counterfeiting and temperature monitoring.

This invention discloses a method for preparing a reverse water-gas shift catalyst and its application, comprising the following steps: (1) dissolving tetrabutyl titanate, cerium nitrate, or gallium nitrate in water with ammonium molybdate, stirring until homogeneous, to prepare a mixed solution; (2) adding an organic acid to the mixed solution, stirring until homogeneous, and adjusting the pH of the solution; (3) heating the solution from step (2) until gelled, drying overnight, and then calcining to obtain the catalyst. This invention is the first to prepare a molybdenum-based bimetallic catalyst using the sol-gel method, which has the advantages of simple preparation steps, readily available raw materials, and safe operation. Furthermore, the catalyst obtained by this invention exhibits excellent CO2 conversion rate and nearly 100% CO selectivity.

The invention provides a composite molecular sieve aromatization catalyst carrier, a catalyst and a distillate oil aromatization reaction. The preparation method of the carrier comprises the following steps: carrying out hydrothermal treatment dealumination on an HZSM-5 molecular sieve to obtain an HZSM-5 dealuminated molecular sieve; the preparation method comprises the following steps: mixing an HZSM-5 dealumination molecular sieve, inorganic alkali, a zinc-containing compound, a thio-compound and a mesoporous template agent, carrying out hydrothermal crystallization, filtering, washing, drying and roasting to obtain a modified ZSM-5 molecular sieve; the modified ZSM-5 molecular sieve, a one-dimensional pore molecular sieve, a binder and an extrusion aid are mixed, kneaded, extruded and molded, dried and roasted, and the composite molecular sieve aromatization catalyst carrier is prepared. The invention also provides a catalyst prepared from the carrier and a distillate aromatization reaction catalyzed by the catalyst. The carrier can effectively improve the aromatization activity and shape selectivity of the catalyst and enhance the carbon deposition resistance of the catalyst.

This invention belongs to the field of microbial technology and provides a microorganism coated with a metal-polyphenol secondary coordination nanocoating, its preparation method, and its applications. This invention involves the self-assembly of polyvinylpyrrolidone, metal ions, and polyphenols to form metal-polyphenol nanoparticles. Subsequently, a continuous nanocoating is rapidly deposited on the surface of the microorganism using the secondary coordination between the nanoparticles and the metal ions, resulting in a coating thickness of approximately 100 nm. The coating construction method of this invention is applicable to different types of microorganisms, and the coating has no significant impact on the normal growth of the microorganisms, exhibiting good biocompatibility. Simultaneously, this nanocoating can selectively promote the biofilm formation of Gram-negative probiotics (EcN). This promoting effect is maintained in a simulated intestinal mucus system. This invention can be used to improve the adhesion and colonization ability of probiotics and is applicable to the construction of probiotic preparations and microecological regulation systems.

The invention provides an iron-based catalyst and a preparation method thereof. The preparation method comprises the following steps: preparing ferric salt and manganese salt into a homogeneous-phase mixed solution; heating the homogeneous-phase mixed solution so that the ferric salt and the manganese salt are subjected to in-situ thermal decomposition to form an iron-manganese oxide matrix; the iron-manganese oxide matrix is placed in an auxiliary agent metal precursor solution for wet impregnation, an impregnation system is subjected to drying and high-temperature roasting, and the iron-based catalyst is obtained, the iron-manganese composite catalyst is prepared by virtue of a one-step co-evaporation pyrolysis process and a dipping roasting process, the preparation steps are simple, the production period and cost are effectively reduced, and unification of preparation simplicity and high catalytic efficiency of the iron-based catalyst is realized.

The invention relates to the technical field of biological medicine manufacturing, and provides a water-soluble microcapsule and a preparation method thereof.The preparation method comprises the following steps that an emulsifying agent, a thickening agent and a water-soluble monomer are dissolved in water, and an emulsion continuous phase is obtained; the content of the emulsifier in the water is 0.5%-5%; the content of the thickening agent in the water is 0.5%-5%; the ratio of the water-soluble monomer to the water is (1: 100)-(20: 100); the water-soluble monomer is introduced to increase the viscosity of a water phase and participate in construction of a shell layer, so that diffusion of a core material to the water phase is effectively inhibited, and high encapsulation efficiency and high drug loading capacity are realized; the process parameters such as the emulsifying rotating speed and the monomer proportion are easy to adjust, microcapsules with the particle size ranging from 1 micrometer to 800 micrometers can be prepared in a controlled mode, the packaging requirements of different water-soluble active substances such as vitamins and enzyme preparations are met, and the product adaptability is good.

The invention provides a purification method of L-malic acid. The purification method comprises the following steps: adding a calcium source into an L-malic acid fermentation solution, and carrying out precipitation treatment to obtain an L-malic acid fermentation neutralization solution; performing centrifugal treatment on the L-malic acid fermentation neutralization liquid by using a horizontal centrifuge to obtain a calcium malate wet product; performing water washing purification and solid-liquid separation on the calcium malate wet product to obtain a calcium malate filter cake; and acidifying the calcium malate filter cake to obtain the L-malic acid. According to the method, the steps for preparing the L-malic acid are simplified, the energy consumption and the environmental pollution are reduced, the purity and the preparation efficiency of the L-malic acid are further improved, and a new method is provided for production and application of the L-malic acid.

The invention discloses laser curing type conductive silver ink for electronic components and a preparation method of the laser curing type conductive silver ink. The laser curing type conductive silver ink comprises a silver precursor, an amine complexing agent, a non-polar organic solvent and an additive, a silver precursor and an amine complexing agent form a uniform and stable silver-amine complex solution in a non-polar organic solvent. The preparation method comprises the following steps: uniformly mixing a non-polar organic solvent, an amine complexing agent and an additive, then adding a silver precursor, stirring until the silver precursor is completely dissolved, and filtering to obtain the conductive silver ink with excellent conductivity, stability and printing performance. The invention also provides a method for preparing a conductive film on a substrate by using the conductive silver ink through a laser sintering process. According to the conductive silver ink, the light absorption characteristic of the silver-amine complex is regulated and controlled through the non-polar solvent, so that the conductive silver ink perfectly adapts to a laser sintering process, and the conductive silver ink has the advantages of being low in curing energy consumption, short in curing time, free of thermal damage to a flexible base material, high in conductivity of a formed silver film, high in adhesive force and the like, and is suitable for the fields of flexible electronics, printed circuits and the like.

The application relates to a linear negative temperature coefficient thermistor material. The material takes graphene oxide and a manganese-cobalt-nickel system transition metal oxide as a base material, is doped with urea, melamine, dicyandiamide, thiourea, boric acid or sodium borohydride, and is obtained by hydrothermal synthesis to have the linear negative temperature coefficient thermistor material. The material has obvious NTC performance, and the resistance value thereof changes with temperature in a linear manner. The preparation steps are simple, the process is safe, the cost is low, the performance is stable, and the material is easy to popularize in the industrial field. The material overcomes the process of realizing the compensation of electrical parameters from nonlinearity to linearity by complicated design of a circuit part in the application process of an existing nonlinear thermistor device, and has a larger TCR value compared to a linear negative temperature coefficient thermistor material obtained by only doping modification, and has a good application prospect in the temperature sensing field.

This invention discloses a method for the catalytic synthesis of 3-methylpyridine from pyridine. A nitrate mixture is dropwise added to an excess sodium hydroxide solution under magnetic stirring. A ferrite catalyst is prepared by co-precipitation. The ferrite catalyst is activated at high temperature. The molar ratio of methanol and pyridine is adjusted to form a mixed solution. The reaction temperature, reaction pressure, and feed flow rate are adjusted. The mixed solution is introduced and vaporized. The vaporized pyridine-methanol mixture undergoes a catalytic reaction with the catalyst bed in the reactor. The product is discharged through the outlet and collected by condensation, yielding highly selective 3-methylpyridine. This invention uses pyridine and methanol as raw materials and, under the action of a ferrite catalyst, achieves highly selective synthesis of 3-methylpyridine with a yield exceeding 86%, reducing production costs and improving economic efficiency.

This invention belongs to the field of adsorption material technology, specifically relating to a hollow sodium alginate gel sphere and its preparation method and application. The method of this invention includes the following steps: (1) dissolving sodium alginate and foaming agent sodium bicarbonate in water and stirring until dissolved to obtain a sodium alginate-sodium bicarbonate mixed solution, wherein the concentration of sodium alginate is 1w%~2w% and the concentration of foaming agent sodium bicarbonate is 3w%~15w%; (2) adding the sodium alginate-sodium bicarbonate mixed solution dropwise to a calcium chloride solution to carry out a solidification reaction, forming solid sodium alginate gel particles; immersing the solid sodium alginate gel particles in an acidic solution to allow the foaming agent to react, thereby obtaining hollow sodium alginate gel spheres. The method of this invention is simple, low-cost, and pollution-free; the hollow gel spheres obtained have an ideal structure and, as a flavor carrier, have the advantages of large loading capacity, high flavor release efficiency, and high smoke transfer rate, showing good application prospects in improving the aroma quality of cigarettes.

This invention relates to the field of aspirin medicinal chemistry, and particularly to an aspirin-dithiocarbamate hybrid, its preparation method, and its applications. The preparation method uses aspirin (ASP) as the parent compound and involves a three-step reaction: acylation, dithiocarbamate formation, and N-acylation. During this reaction, several novel aspirin-dithiocarbamate hybrids (3a–l) can be efficiently synthesized through a single silica gel column chromatography separation and purification step, making the preparation process simple. The prepared aspirin-dithiocarbamate hybrids significantly enhance the toxicity of human lung cancer cells A549, approximately eight times that of the parent compound ASP, and are comparable to the anticancer drug irinotecan. The prepared aspirin-dithiocarbamate hybrid 3f exhibits inhibitory effects on various cancer cells and can inhibit the growth of human lung cancer A549 cells by inducing cell cycle arrest in the G0 / G1 phase.

The application discloses a control method of an automatic cutting preparation soil sample device, wherein the device comprises a main frame unit for placing an original soil sample, and a cutter disc unit connected with the main frame unit; the control method comprises the following steps: obtaining initial state information of the original soil sample, and determining target state information according to the initial state information; and according to the initial state information and the target state information, the cutter disc unit is controlled to cut the original soil sample on the main frame unit, so that a target soil sample corresponding to the target state information is obtained. Through the connection mode of the main frame unit and the cutter disc unit, when target soil samples with different target shapes and sizes need to be prepared, the original soil sample can be conveniently cut in a three-dimensional space, the preparation steps are simplified, the cutting quality is improved, and the application range of the device is further increased.

The present application belongs to the technical field of traditional Chinese medicine detection, and particularly relates to a thin-layer identification method of Xuanyu Tongjing pharmaceutical preparation. The present application provides a thin-layer identification method of Xuanyu Tongjing pharmaceutical preparation, comprising the following steps: preparing a test sample solution A, and based on the test sample solution A, using thin-layer chromatography to simultaneously identify gardenia, licorice, white peony root and cortex moutan in the Xuanyu Tongjing pharmaceutical preparation; according to the thin-layer chromatography: taking the test sample solution A, a control medicinal solution and a control sample solution, respectively spotting on the same silica gel thin-layer plate, and using a volume ratio of ethyl acetate, formic acid, glacial acetic acid and water as 15:(1-3):(1-3):2 as a developing agent for development. The thin-layer identification method can simultaneously detect the licorice, gardenia, white peony root and cortex moutan components in the Xuanyu Tongjing pharmaceutical preparation, and has short detection time and high efficiency.

The present application relates to the technical field of microcapsule preparation, in particular to a one-step process for preparing enteric seamless microcapsules and application thereof.The preparation process comprises the following steps: preparing a wall material liquid and a core material liquid, dropping the wall material liquid and the core material liquid into a cooling liquid through a concentric nozzle to form microcapsules, filtering and collecting the microcapsules and placing them in a room temperature drying device for 2-4 hours to obtain enteric seamless microcapsules; the wall material liquid and the core material liquid are respectively introduced into the outer layer and the inner layer of the concentric nozzle; the cooling liquid is an enteric coating powder solution.The raw material ratio of the wall material liquid, the core material liquid and the cooling liquid is optimized, the wall material liquid and the core material liquid are simultaneously dropped into the cooling liquid through the concentric nozzle, and the obtained seamless microcapsules have enteric solubility, can resist gastric juice erosion and only disintegrate rapidly in the intestinal environment; the process has simple preparation steps, is fast, has high product yield, is safe and has wide application.

This invention relates to boron-nitrogen co-doped fluorescent carbon quantum dots, their preparation method, and their application in the fabrication of chromium / copper ion sensors. It belongs to the field of carbon quantum dot technology and includes the following steps: mixing o-phenylenediamine hydrochloride and boric acid to obtain a mixed solution; adding water to the mixed solution and ultrasonically dissolving it to obtain a mixed solution; treating the mixed solution at high temperature to obtain a boron-nitrogen co-doped carbon material solution; filtering the carbon material solution through a 0.22 μm microporous membrane to obtain a boron-nitrogen co-doped carbon quantum dot aqueous solution, and then dialyzing it using a dialysis bag for 36-48 h; freeze-drying the carbon quantum dot aqueous solution to obtain boron-nitrogen co-doped fluorescent carbon quantum dots. This invention achieves pH-controlled chromium / copper ion sensors using a single quantum dot material and a one-step synthesis process. 6+ / Cu 2+ The dual-channel high-sensitivity detection overcomes the technical barriers of limited probe selectivity, complex processes, and limited functionality in existing probes.

The invention relates to a deuterated difluoromethyl compound as well as a preparation method and application thereof, and belongs to the technical fields of organic synthetic chemistry, medicinal chemistry and organic fluorine chemistry. The structural formula of the deuterated difluoromethyl compound is shown as a formula I. Compared with the prior art, a deuterium source and other reagents are cheap and easy to obtain, no transition metal is used, and the deuterated difluoromethyl compound is suitable for synthesizing drugs sensitive to heavy metal residues; the whole preparation process of the deuterated difluoromethyl compound is simple in step, easy to operate, high in product yield and high in deuteration rate; the deuterated difluoromethyl compound provided by the invention is wide in functional group application range in synthesis of other deuterated difluoromethylation reactions, is suitable for later modification of drugs, and is beneficial to grafting to modification of existing drugs. The preparation process of the deuterated difluoromethyl compound is simple and economical, the structure is stable, the reaction activity is high, and deuterated difluoromethylation reaction of different types of compounds can be realized.

The application relates to the technical field of photothermal materials, in particular to a preparation method of a photothermal conversion material based on a supramolecular co-crystal. The method comprises the following steps: step 1, activating a co-crystal material based on a hetero[4]arene; step 2, taking thiophene and the activated co-crystal material based on the hetero[4]arene, and preparing the photothermal conversion material by adsorbing the gas volatilized from the thiophene through the activated co-crystal material based on the hetero[4]arene. The preparation process adopts raw materials which are easy to obtain, reduces the preparation cost, simplifies the preparation steps, makes the synthesis of the photothermal conversion material more economical and efficient, helps to improve the preparation feasibility and scalability, and lays a foundation for large-scale production and commercial application.