354 results about "Bromide" patented technology

A composite material for passive cooling includes a porous structure including an expanded graphite and a surfactant, the porous structure being provided with at least one crystalline deliquescent salt that is selected from the group consisting of chloride, bromide, sulphate, and nitrate. The uses of the composite material in passive cooling are also addressed.

The application discloses a PAG bonding type photosensitive photoresist resin and a preparation method and application thereof. The photoresist resin is as follows: formula. The PAG bonding type resin is prepared through the following reaction process: 1) performing a RAFT polymerization reaction on p-acetoxystyrene, p-styrene sulfonamide trifluoromethyl potassium salt and a RAFT chain transfer agent under the action of an initiator to obtain an intermediate I, 2) performing a hydrolysis reaction on the intermediate I to obtain an intermediate II, 3) performing a protection group introduction reaction on the intermediate II and di-tert-butyl dicarbonate to obtain an intermediate III; and 4) performing an ion exchange reaction on the intermediate III and triphenylsulfonium bromide. The application realizes the bonding of the PAG into the resin skeleton, and improves the problems of poor compatibility between the PAG and the resin, phase separation, uneven distribution of the PAG and the like. Therefore, the photoresist prepared from the resin has the photo-generated acid bound by the polymer main chain and limited diffusion, the resolution is improved, and the photoetching effect is excellent.

The invention discloses a carbamoyl-substituted diarylethene derivative as well as a preparation method and application thereof, and the preparation method comprises the following steps: reacting R-substituted 3-bromo-2-hydroxybenzaldehyde with an arylmethyl triphenylphosphonium bromide compound or an aryl acetic acid compound to obtain an intermediate A; then the intermediate A and cuprous cyanide are subjected to a heating reaction in N, N-dimethylformamide and nitrogen atmosphere, and an intermediate B is obtained; and finally, heating the intermediate B, acetaldoxime and indium trichloride in toluene for reaction to obtain the carbamoyl-substituted diarylethene derivative. The carbamoyl-substituted diarylethene derivative disclosed by the invention has a remarkable effect in an in-vitro anti-tumor activity test, particularly has excellent anti-proliferation ability to human BRCA mutant tumor cells, and can be used for preparing medicines for treating PARP-1 activity abnormity related diseases. The synthesis route is simple, the cost is low, and large-scale implementation is facilitated.

The invention discloses preparation of a nitrogen-rich ionic organic single crystal material and application of the nitrogen-rich ionic organic single crystal material in iodine adsorption, and belongs to the technical field of functional materials and radioactive pollutant treatment. The material is formed by self-assembly at room temperature through a solution method by taking biphenyl tetracarboxylic acid tetrabutylamine as an anion ligand and tetra (4-ethyl pyridine phenyl) ethylene bromide or tetra (4-imidazole phenyl) ethylene bromide as a cation ligand. The method is simple in preparation process, mild in condition and high in yield. The skeleton of the obtained material is rich in nitrogen sites and has a large cavity, the material shows extremely high adsorption capacity and rapid adsorption kinetics for iodine in a gas phase and a liquid phase, the maximum adsorption capacity of the material for iodine steam reaches up to 5.16 g / g, the retention rate of 95% or above can still be kept within 7 days after adsorption, and the material has good recycling performance. The material provides a novel and reliable solution for efficiently capturing and fixing radioactive iodine, and has a wide application prospect in the field of nuclear waste treatment.

The invention discloses a fluorescent probe for targeting mitochondrial ferric ions as well as preparation and application of the fluorescent probe. The fluorescent probe is prepared by reacting cucurbit [7] uril with (E)-4-(4-(dimethylamino) styryl)-1-(3-(triphenylphosphonium) propyl) pyridine-1-onium bromide according to a molar ratio of 1: 1. The fluorescent probe can be used for detecting Fe < 3 + > ions, and has the characteristics of simple preparation method, convenience in operation, high sensitivity, high selectivity, low cost and rapidness in detection.

A zinc / bromine flow battery comprises an electrolyte. The electrolyte comprises an active substance, a supporting electrolyte, and an additive. The additive is selected from at least one of 1-ethyl-3-methylimidazolium bromide, 1-ethyl-3-methylimidazolium chloride, 1-carboxymethyl-3-methylimidazolium bromide, and 1-carboxymethyl-3-methylimidazolium chloride. The use of the additive can regulate the deposition morphology of zinc and suppress zinc dendrites, and can also inhibit the diffusion of bromine on the positive electrode side, thereby improving the coulombic efficiency of the battery. Moreover, the complex product formed by the additive complexed with bromine does not produce solids during long-term cycling, whereas the complex product of conventional MEP in the later stage of battery cycling forms solids which are unevenly distributed on the electrode surface, reducing the voltage efficiency of the battery and shortening the service life of the battery.

The present invention discloses a method and system for producing hexafluorobutadiene, which includes the following steps: In step (1), an organic solution of bromotrifluoroethylene and zinc powder are respectively introduced into a first reactor containing an initiator, zinc powder, and an organic solvent, followed by a second reactor, and reacted to obtain a trifluorovinylzinc bromide solution. The reaction solution is then introduced into a precipitator to separate excess zinc powder, resulting in a zinc-free trifluorovinylzinc bromide solution. The excess zinc powder is then filtered and reused. In step (2), the trifluorovinylzinc bromide solution obtained above and a pre-prepared composite catalyst solution are introduced into a third reactor and subjected to a coupling reaction to obtain crude hexafluorobutadiene. In step (3), the crude hexafluorobutadiene obtained above is purified to obtain a product with a purity of ≥ 99.9%.

The present application relates to a method for liquid phase oxidation of durene, which comprises: a first stage, in the presence of a catalyst, with acetic acid as a solvent, a liquid phase oxidation reaction of an oxidant source and durene to produce an intermediate mixture, the catalyst containing Co salt, Mn salt, Zr salt and bromide compound; a second stage, adding a mixture of bromide and pure water to the intermediate mixture, and continuing the oxidation reaction with the oxidant source to produce pyromellitic acid; wherein the concentration of oxidant in the oxidant source of the first stage is lower than the concentration of oxidant in the oxidant source of the second stage. By controlling the concentration of oxidant in the oxidant source of the first stage to be lower than the concentration of oxidant in the oxidant source of the second stage in the liquid phase oxidation process of durene, the yield of pyromellitic acid and the purity of crude pyromellitic acid are significantly improved.

The application discloses a preparation method of benzoic acid, and belongs to the technical field of organic chemical synthesis. The method uses toluene as raw material, adopts a bromine-free composite supported catalyst, cooperates with a three-stage gradient temperature oxidation process, and obtains benzoic acid products through the steps of raw material premixing, segmented temperature control oxidation, catalyst separation and recovery, desolventizing and crude product refining. The method completely abandons the bromide initiator of the traditional process, solves the problems of bromine pollution and equipment corrosion from the root, and overcomes the defects of the prior art, such as difficult recovery of the catalyst, difficult consideration of toluene conversion rate and benzoic acid selectivity, and low product purity. The method has the advantages of mild reaction conditions, efficient recovery and recycling of the catalyst and the solvent, excellent catalytic activity and selectivity, high product purity, low heavy metal residue, and good industrial application prospect.

The application relates to a chiral NSiN ligand based on a phenyloxazoline skeleton, a preparation method and application thereof, wherein the chiral NSiN ligand is prepared from a chiral phenyloxazoline bromide with R or S configuration through lithiation and silylation. The chiral NSiN ligand can be used in transition metal catalyzed asymmetric synthesis, and is used in catalyzing an allylic sulfonylation reaction with a cobalt catalyst, and shows high reaction activity and high stereoselectivity.

The invention discloses a highly-oriented quasi-two-dimensional perovskite multi-wafer scintillator for X-ray detection imaging and a preparation method of the highly-oriented quasi-two-dimensional perovskite multi-wafer scintillator, and relates to the technical field of radiation detection and scintillation materials, the highly-oriented quasi-two-dimensional perovskite multi-wafer scintillator comprises phenethyl ammonium bromide, cesium lead tribromide and ammonium thiocyanate, the molar ratio of the phenethyl ammonium bromide to the cesium lead tribromide to the ammonium thiocyanate is 2: 4: 2, the scintillator contains a methylamine thiocyanate additive which accounts for 0-1 equivalent weight of the dosage of the ammonium thiocyanate, and the scintillator is of a flaky polycrystal structure; the perovskite crystal of the polycrystalline wafer has a quasi-two-dimensional layered crystal structure, and each crystal grain is arranged in a height orientation manner, so that the layered crystal face is parallel to the main plane of the scintillator sheet. According to the highly-oriented quasi-two-dimensional perovskite multi-wafer scintillator for X-ray detection imaging and the preparation method of the highly-oriented quasi-two-dimensional perovskite multi-wafer scintillator, a highly-oriented layered structure is formed in the crystal, diffuse scattering of emergent light is greatly reduced, brightness uniformity and spatial resolution of X-ray imaging are improved, and a finer imaging effect is achieved.

The invention relates to the technical field of oilfield chemistry, in particular to a self-crosslinking thickening agent and a preparation method thereof, the self-crosslinking thickening agent is obtained by copolymerization of acrylamide, acrylic acid, a physical crosslinking monomer and a chemical crosslinking monomer; the physical crosslinking monomer is N-cinnamyl-N, N-dimethyl hexadecyl ammonium chloride; the chemical cross-linking monomer is N-allyl-N, N-dimethyl p-benzaldehyde ammonium bromide, and the chemical cross-linking monomer is N-allyl-N, N-dimethyl p-benzaldehyde ammonium bromide; the molar ratio of the acrylamide to the acrylic acid to the physical crosslinking monomer to the chemical crosslinking monomer is (70-80): (15-25): (0.1-0.5): (0.1-0.5). According to the self-crosslinking thickening agent and the preparation method thereof, the thickening agent has good temperature resistance and salt resistance, meets the current oil and gas field development requirements, is reliable in method principle, easy and convenient to operate and mild in reaction condition, has wide market application prospects and can be widely applied to oil and gas resource development of high-temperature and ultrahigh-temperature reservoirs.

The invention discloses a Pt-coated ZrO2-coated SiO2 catalytic ceramic membrane with a core-shell structure as well as a preparation method and application of the Pt-coated ZrO2-coated SiO2 catalytic ceramic membrane, and belongs to the technical field of advanced oxidation and water treatment. The method comprises the following steps: preparing platinum nano sol by an ethylene glycol reduction method; the preparation method comprises the following steps: coating Pt-coated ZrO2 core-shell particles with tetragonal phase ZrO2; the preparation method comprises the following steps: preparing a porous SiO2 shell, dispersing the porous SiO2 shell in an ethanol solution, adding tetraethoxysilane (TEOS), coating the porous SiO2 shell through a Stber method by taking cetyltrimethylammonium bromide (CTAB) as a template agent and ammonia water as a catalyst, and then roasting to remove the template agent to form Pt-coated ZrO2-coated SiO2 core-shell particles; the preparation method comprises the following steps: uniformly dispersing Pt-coated ZrO2-coated SiO2 core-shell particles in absolute ethyl alcohol to obtain a suspension, dipping a commercial alpha-Al2O3 flat sheet membrane in the suspension, taking out, drying, and sintering in an air atmosphere to obtain the Pt-coated ZrO2-coated SiO2 catalytic ceramic membrane with the core-shell structure. The ceramic membrane is high in catalytic activity, good in stability and large in membrane flux. The invention is applied to advanced treatment of algae-containing water and degradation-resistant organic wastewater.

The application belongs to the field of medicine synthesis, and particularly relates to a preparation method of mesopram racemate. First, 1-(4-methoxy-3-propoxyphenyl) ethan-1-one, methyl triphenylphosphonium bromide and alkali are reacted in a solvent under inert gas protection to obtain a styrene intermediate I; then the intermediate I, a BocNCl2 reagent and an alkali reagent are reacted in a solvent to generate the mesopram racemate. The method provided by the application has the advantages of short steps, low cost, no metal residue and mild reaction conditions, and is suitable for industrial production.

The invention discloses an anti-crack rheology modified functional material for a steel plate-concrete combined cable bent tower as well as a preparation method and application of the anti-crack rheology modified functional material. The anti-crack rheological modified functional material comprises a 1-10 [mu] m superfine light-burned magnesia expansion material, a 15-30 [mu] m medium-fine light-burned magnesia expansion material, a 30-100 [mu] m medium-coarse calcium expansion material, 0.1-2 [mu] m fly ash microspheres, 0.02-0.05 [mu] m nano-silica and an anti-agglomeration regulation and control material, wherein the anti-agglomeration regulation and control material is formed by compounding a zirconium aluminate coupling agent and cetyltrimethylammonium bromide; the anti-crack rheological modified functional material is applied to ultrahigh-strength steel plate-concrete combined cable bent tower structure concrete. The concrete prepared from the anti-crack rheology modified functional material prepared by the preparation method has low viscosity, good segregation resistance and volume stability, and the synergism and unification of concrete rheology modification and anti-crack expansion of an ultrahigh-strength steel plate-concrete combined cable bent tower structure are realized.

The invention relates to a preparation method of a metal halide perovskite-coated three-dimensional cobalt porphyrin-based COFs (Covalent Organic Frameworks) composite material, which comprises the following steps: S1, reacting an aldehyde precursor with an amine precursor in a first organic solvent, and after the reaction is finished, performing post-treatment to obtain a three-dimensional cobalt porphyrin-based COFs material; wherein the aldehyde precursor is 5 ', 5 '', 5'' '', 5'' ''''-(5, 10, 15, 20-tetrayl) tetra (([1, 1': 3 ', 1 ''-terphenyl]-4, 4''-diformyl))-21H, 23H-cobalt porphyrin (II), and the amine precursor is 4, 4'-diamino terphenyl and 2 ', 5'-bis ((methylthio) methyl)-[1, 1 ': 4', 1 ''-biphenyl]-4, 4''-diamine; s2, in a second organic solvent, enabling the three-dimensional cobalt porphyrin-based COFs material to react with lead bromide, and after the reaction is finished, performing post-treatment to obtain a PbBr2 (at) 3D Co-COFs material; and S3, in a third organic solvent, carrying out a reaction on the PbBr2 (at) 3D Co-COFs material and methylamine bromide, and after the reaction is finished, carrying out post-treatment to obtain the metal halide perovskite (at) three-dimensional cobalt porphyrin-based COFs composite material. The preparation method has the advantage that the photocatalytic activity and stability are improved.

The application belongs to the technical field of oil exploitation, and particularly relates to an acid liquid for acid treatment of an oil layer and a preparation method thereof. The preparation method is as follows: the specific steps of the preparation method are as follows: in a reactor, piperazine-1,4-diethyl sulfonate monosodium salt, ethanol and bromoalkane are added, heated to reflux, and during the reaction, sodium hydroxide solution is used to maintain pH 7-8; 1-bromo-6-(trimethylammonium) hexyl bromide is added, heated to reflux, and during the reaction, sodium hydroxide solution is used to maintain pH 8-9; vacuum distillation is performed to obtain a viscous solid, cyclohexane recrystallization is performed to obtain a solid, and the solid is dried at 90 DEG C overnight to obtain corrosion-inhibiting acid; hydrochloric acid, hydrofluoric acid, hydroxyethylidene diphosphonic acid, corrosion-inhibiting acid and water are added to the reactor, stirred uniformly, and the acid liquid is obtained. The acid liquid has the advantages of low corrosion rate and long acidification time.

An electrochemical method for preparing N-arylsulfonylimine compound, comprising the following steps: in air atmosphere, a sulfoximine compound and an alpha-keto acid are added into a reactor in a molar ratio of 1:2, an electrolyte tetrabutylammonium tetrafluoroborate, a catalyst nickel bromide are added, and then an acetone solution is added; the mixture is stirred by a magnetic stirring device, and is dissolved; two electrodes are inserted, a graphite electrode is used as a positive electrode, and a platinum sheet electrode is used as a negative electrode; 6mA of current is passed, and the current passing time is 3h; after the reaction is completed, the solvent is removed by vacuum evaporation to obtain a crude product, and the N-arylsulfonylimine compound is obtained by column chromatography purification. Compared with a traditional synthesis method, the method has the advantages that the reaction condition is mild, can be successfully carried out at room temperature, operation is simple, all operations can be carried out in an open system, an electric current is used as an oxidation method, pollution of a chemical oxidant is avoided, raw materials are easy to obtain, functional group compatibility is good, and the scope of application of a substrate is wide.

The application relates to the field of thermal catalysis, and discloses a method for preparing 1-cyclohexylbenzene hydrogen peroxide by solvent-free thermal catalytic selective oxidation of cyclohexylbenzene with molecular oxygen. The method uses a metal bromide as a catalyst, azobisisobutyronitrile or t-butyl hydroperoxide as an initiator, and pure oxygen as an oxidant, and can effectively selectively oxidize cyclohexylbenzene (CHB) into 1-cyclohexylbenzene hydrogen peroxide under normal pressure, solvent-free conditions and at a temperature above 90 DEG C. The catalytic system has the advantages of low cost, simple operation process, high catalytic oxidation efficiency and high selectivity of the target oxidation product.

According to the efficient synthesis method of the alpha-carbonyl spiro compound, aryl bromide is used as a substrate, benzene-1, 3, 5-triformic acid triester is used as a safe and green carbonyl source, palladium is used as a catalyst, organic phosphine is used as a ligand, and 1, 8-diazabicyclo [5.4. 0] undec-7-ene (DBU) is used as alkali, so that the amide-containing bis-heterocyclic compound is successfully synthesized. The method adopts a one-pot method, and has the characteristics of greenness, safety, simplicity in operation, wide substrate range, good functional group compatibility, high bonding efficiency and the like. The product alpha-carbonyl spiro compound is an important intermediate for synthesizing complex molecules such as drugs and natural products, and the method has important significance in the fields of medicines, pesticides, chemical engineering and the like.

The present invention relates to the use of a trivalent chrome plating bath composition for the electrodeposition of a hard chrome layer with a thickness of 1 µm or more, the composition comprising (A) trivalent chromium ions in an amount of 5-40 g / l, (B) at least one anion selected from sulfate, chloride, bromide and methanesulfonate, (C) at least one carboxylate ion selected from formate and acetate, (D) at least one buffer substance selected from ammonia, boric acid, carboxylic acids with 2 to 8 carbon atoms other than component (C) and salts thereof, and aluminium salts, and (E) 0.01 to 100 g / l of at least one specific compound which comprises a sulfonate group and a sulfide or disulfide group. Other aspects of the invention relate to a hard chrome plating process, a hard chrome plating layer and a hard chrome plated article.

The synthesis method comprises the following steps: synthesizing an organic compound containing an alkenyl silicon skeleton by taking silaborane as a silicon free radical precursor, aryl bromide as a coupling component and morpholine as an accelerant and adopting a photooxidation reduction / nickel dual-catalysis system; according to the method, photo-oxidation reduction catalysis and nickel catalysis are combined, challenging alkenyl silicon bonds and carbon-carbon bonds are effectively constructed, conversion which is difficult to complete through a traditional method is achieved, the problems that a traditional transition metal catalytic catalyst is expensive and poor in selectivity are solved, and the method has the advantages of being mild, environmentally friendly, high in reaction efficiency and the like.

The application discloses a method for preparing chiral amino alcohol compounds by using water as a hydrogen source and nickel metal as a catalyst. The method comprises the following steps: dissolving a nickel metal catalyst, zinc powder, an additive and a ligand in a dry organic solvent under an inert gas atmosphere; then adding an o-phthalimido ketone compound and water; and reacting at 40-70 DEG C to obtain a target product. The additive is one or more of silver iodide, cuprous bromide, cuprous iodide and cuprous chloride. The ligand is ( S, S p )- t‑ Bu-Phosferrox, S, S p )-Bn-Phosferrox, R, R p )-Ph-Phosferrox or R, R p )- i‑ Pr-Phosferrox. The application uses water as a hydrogen source and nickel metal as a catalyst to catalyze amino ketone compounds to obtain a series of chiral amino alcohol compounds. The method is simple, clean and environmentally friendly, and is suitable for the conventional preparation of chiral amino alcohol compounds.

The invention discloses a preparation method of a rare earth doped Bi2MoO6 / In2O3 heterojunction composite photocatalyst, and belongs to the technical field of photocatalytic materials, and the preparation method specifically comprises the following steps: S1, preparing a precursor; step S2, preparation of a solid-liquid mixture: putting bismuth salt, rare earth metal salt, hexadecyl trimethyl ammonium bromide and sodium molybdate into deionized water, performing ultrasonic dispersion, adding the precursor In2O3, and performing ultrasonic stirring and uniform mixing to obtain the solid-liquid mixture; and S3, carrying out a hydrothermal reaction on the solid-liquid mixture, naturally cooling, centrifuging, carrying out solid-liquid separation, washing the solid with deionized water, and drying to obtain the rare earth doped Bi2MoO6 / In2O3 heterojunction composite photocatalyst. According to the invention, rare earth doping (especially yttrium Y doping) is introduced, so that the light absorption capacity of the material is further enhanced, efficient migration and compounding inhibition of photo-induced electrons and holes are realized, regulation and control of the energy band structure and light absorption performance of the material are realized, the utilization rate of visible light is further enhanced, and finally, the photocatalytic activity is remarkably improved.

A process for producing oxide particles coated with amino groups comprises the following steps: introducing a plurality of first LLZO particles and methanol into a wet mixer for mixing to form a first slurry; then introducing a tris(tris(hydroxymethyl)aminomethane) material and a tris(hydroxymethyl)aminomethane hydrochloride into the wet mixer for grinding and stirring to form a second slurry and to cause an outer surface of each of the first LLZO particles to be coated with a hydroxide ion layer; then introducing a dopamine hydrochloride into the wet mixer for mixing to form a third slurry and to cause a dopamine layer to be coated on an outer surface of the hydroxide ion layer on each of the first LLZO particles. A CTAB surfactant (cetyltrimethylammonium bromide) is added to the third slurry.

The invention discloses a cubic ZIF-67 / MXene wave-absorbing material as well as a preparation method and application of the cubic ZIF-67 / MXene wave-absorbing material. The preparation method comprises the following steps: reacting lithium fluoride, concentrated hydrochloric acid and deionized water to generate hydrofluoric acid, and etching an MAX phase to obtain MXene; the preparation method comprises the following steps: dispersing CoCl2. 6H2O, cetyl trimethyl ammonium bromide (CTAB) and MXene in deionized water to form a solution A; dispersing 2-methylimidazole in deionized water to form a solution B; quickly pouring the solution A into the solution B, stirring and reacting, centrifuging, freeze-drying and annealing to obtain the cubic ZIF-67 / MXene wave-absorbing material. The material is of a multi-layer sandwich structure, the reflection loss at 16.69 GHz can reach-20.79 dB, the matching thickness is 1.87 mm, the effective absorption bandwidth (RL is smaller than or equal to-10 dB) is 6.19 GHz (11.81-18.00 GHz), and the Ku wave band is covered. The method is environment-friendly in process, low in cost, simple and convenient to operate and suitable for large-scale production, and has application prospects in the fields of microwave absorption, infrared stealth and photocatalysis.

The application discloses a preparation method of a wide-bandgap perovskite photoactive layer, and comprises the following steps: S1, lead iodide powder, cesium iodide powder and ytterbium bromide powder are proportioned according to a proportioning molar ratio, and an inorganic target material is prepared by using a hot-press sintering process; S2, formamidinium hydriodide powder and methylammonium bromide powder are proportioned according to a proportioning molar ratio, and an organic target material is prepared by using a normal-temperature preparation process; S3, a pretreated substrate is placed on a magnetron sputtering sample table, the target materials prepared in steps S1 and S2 are respectively installed on corresponding radio frequency sputtering targets, and the background of a magnetron sputtering system is vacuumized; S4, high-purity argon gas is used as a sputtering gas, and a wide-bandgap perovskite thin film is prepared by using a magnetron co-sputtering method; the sputtering power of the inorganic target material prepared in step S1 is controlled, the sputtering power of the organic target material prepared in step S2 is controlled, and the thickness of the thin film is controlled, so that the high-quality thin film is prepared by using the differential target material preparation process.

The invention discloses a preparation method of a dialkynyl silane compound, which belongs to the technical field of organic synthesis and comprises the following steps: sequentially adding a reducing agent, an organic solvent, alkynyl bromide and chlorosilane into a reaction container, and reacting at 20-60 DEG C for 6-36 hours to obtain a mixture A; wherein R1 is allyl, alkyl or aryl; wherein R2 is allyl, alkyl or aryl; wherein R3 is an alkenyl group, an alkyl group, an alkoxy group or a silicon group; wherein R is halogen, alkyl, aryl, alkoxy, ester group, cyano or carbonyl; diluting the mixture A with ethyl acetate, adding silica gel powder, and performing vacuum concentration to remove the reaction solvent to obtain a mixture B; and separating the mixture B through thin-layer chromatography or column chromatography to obtain the target product dialkynyl silane compound. According to the method, dialkynyl silane substituted by different alkynyl groups can be obtained at the same time, the chemical selectivity is good, and dialkynyl silane which is not easy to obtain by other methods can be synthesized.

The application discloses a composite photocatalyst of B-doped g-C3N4 microrod loaded with WO3 short fibers and a preparation method thereof. The method comprises the following steps: melamine, boron oxide, sodium tungstate dihydrate, urea and cetyltrimethylammonium bromide are proportioned according to the mass ratio of (1-10):(0.5-4):(1-6):(1-5):(0.2-3) to obtain a mixed powder, 60 mL of methanol is added, the mixture is fully dispersed, and then the mixed solution is quickly poured into a lining in a reaction kettle; the reaction kettle is sealed, placed in a vacuum drying box, and kept at 60-150 DEG C for 2-10 h, the reaction solution is poured out after cooling, centrifuged, washed and dried to obtain a precursor WB-CN; the WB-CN prepared in step two and ammonium fluoride are taken according to the mass ratio of (1-10):(0.5-3), ground, and then put into a white porcelain boat, covered, and placed in a muffle furnace for calcination, the heating speed is 4-10 DEG C / min, the temperature is 500-650 DEG C, and the holding time is 2-5 h; after calcination, the sample is dispersed in water, fully stirred, then centrifuged, washed and dried, so as to obtain a WO3 / B-g-C3N4 photocatalyst with stable structure and high hydrogen production efficiency, and the microstructure of the WO3 / B-g-C3N4 photocatalyst is that the WO3 short fibers are uniformly loaded on the g-C3N4 microrod.

The invention belongs to the technical field of biomedicine, and particularly relates to a preparation method of a potassium K < + > recognition response quartz crystal microbalance chip and a blood potassium concentration quantitative detection method. A 3-aminopropyltriethoxysilane (APTES) solution is used for carrying out functionalization treatment on the surface of a silicon dioxide sheet, so that a large number of amino functional groups are obtained on the surface of the silicon dioxide sheet. The preparation method comprises the following steps: taking 4-acrylamide benzene-15-crown-5 as a template, then anchoring an ATRP (Atom Transfer Radical Polymerization) initiator-bromoisobutyryl bromide on the surface of the template through a covalent bond, and carrying out grafting construction of a benzene-15-crown-5 functional polymer brush by adopting Cu0-mediated surface-initiated atom transfer radical polymerization (Cu0-SI-ATRP) by taking 4-acrylamide benzene-15-crown-5 as a polymeric monomer. The potassium selective quartz crystal microbalance based on the crown ether functionalized polymer brush is obtained.