180 results about "Dodecyltrimethylammonium bromide" patented technology

The invention discloses a nanoparticle enhanced low-interfacial-tension foam system and a preparation method thereof. The foam system comprises the following components by weight percent: 0.2-0.8% ofa cationic surface active agent, 0.01-0.1% of a stabilizer, 0.5-1.0% of a polymerization inhibitor, 0.3-1.0% of an additive and the balance of mineralized water, wherein the cationic surface active agent is selected from dodecyl trimethyl ammonium bromide, tetradecyl trimethyl ammonium bromide, hexadecyl trimethyl ammonium bromide and stearyl trimethyl ammonium bromide; the stabilizer is selectedfrom modified nano-SiO2, modified nano-MgO and modified nano-TiO2; the polymerization inhibitor is sodium citrate; the additive is selected from ethylene glycol and dodecanol; the mineralized water isa mixed water solution of sodium chloride, anhydrous calcium chloride and anhydrous magnesium sulfate. The nanoparticle enhanced low-interfacial-tension foam system is good in foaming performance andfoam stabilizing performance, high in interfacial activity, cheap and easily accessible in raw material, simple in preparation method and excellent in foam combination performance.

The invention relates to a preparation method for precursor chromic oxide of a chromic fluorination catalyst with high specific surface area, which is characterized by comprises the following steps of: completely dissolving an organic addition agent which can be a polyglycol-series PEG1000-6000, or nonionic surface active agents Tween40, Tween80, or a cation surface active agent dodecyl cetyl trimethyl ammonium bromide in soluble chromic salt solution, controlling the weight ratio of the organic addition agent and the soluble chromic salt to be 0.1: 1 to 0.8: 1, and precipitating by a precipitator under stirring condition, filtering, washing and drying. By adding the organic additive, the method effectively improves the specific surface area of Cr2O3 question mark nH2O (n is less than 3 and more than 0) and has simple and easily operated preparation process and good experimental reproducibility. The prepared compound can be used for producing the fluorination catalyst of HFCs which is the substitute of Freon in a gas phase method after high temperature roasting and activation.

The invention relates to a seawater base fracturing fluid which comprises a seawater base fluid, a gel breaking agent equivalent to 0.1-0.8% of the weight of the seawater base fluid, and a cross-linking agent equivalent to 0.2-0.8% of the weight of the seawater base fluid, and is characterized in that the seawater base fluid comprises the following components in percentage by weight: 0.3-0.6% of a thickening agent, 0.1-1% of a discharge aiding agent, 0.5-3% of a clay stabilizing agent, 0.01-0.1% of a sterilizing agent and the balance being seawater; the gel breaking agent is ammonium persulfate or sodium persulfate; the cross-linking agent is aluminum chloride or zirconium acetate; the clay stabilizing agent is potassium chloride or ammonium chloride; the discharge aiding agent is dodecyltrimethylammonium bromide or cetyltrimethylammonium bromide; and the sterilizing agent is methanal or dodecyl dimethyl benzyl ammonium chloride. The seawater base fracturing fluid has the advantages that the salt tolerance of the seawater base fracturing fluid is outstanding and stable cross-linking can be achieved in a weak alkaline environment.

The invention discloses a preparation method of a nano-composite PTFE (polytetrafluoroethylene) anti-dripping agent. The preparation method comprises the following steps: 1), preparing an initiator solution; 2), preparing a nano-hydrotalcite solution; 3), adding 7 parts of maleic anhydride, 55 parts of maleic anhydride, 8 parts of butyl methacrylate, 2 parts of calcium carbonate, 8 parts of superfine silicon dioxide powder, 2 parts of primary alcobol ethoxylate, 1 part of alkylphenol ethoxylates, 1 part of dodecyl trimethyl ammonium bromide, 2 parts of dodecyl trimethyl ammonium sulfate, 4 parts of polyoxyethylene lauryl ether and 5 parts of kaolin into a reaction kettle and stirring uniformly, raising the temperature to 85 DEG C at 5 DEG C / min, and adding 15 parts of initiator solutions for one hour of a seed reaction; 4), obtaining polymer emulsion; 5), obtaining precipitate; and 6), performing centrifugal separation on the precipitate, washing an emulsifier in a system with hot water at the temperature of 75 DEG C, performing centrifugal separation again, and performing drying and grinding to obtain the anti-dripping agent. The nano-composite PTFE anti-dripping agent prepared with the method has good stability.

The invention discloses a silver / silver bromide / silver metavanadate plasma compound photocatalyst and a preparation method thereof. The photocatalyst comprises silver, silver bromide and silver metavanadate, wherein the silver metavanadate is nanoribbon, and silver and silver bromide particles are loaded on the silver metavanadate. The preparation method comprises steps of fully dissolving silver metavanadate and dodecyl trimethyl ammonium bromide in water; continuously stirring under light condition and fully mixing; and finally irradiating in the sun so as to obtain the silver / silver bromide / silver metavanadate plasma compound photocatalyst. The preparation method has the advantages of high yield, low cost and short production process, and can be put into industrial production conveniently. The silver / silver bromide / silver metavanadate plasma compound photocatalyst prepared by the method has very excellent light degradation performance.

The invention provides a preparation method for gold nanoparticle bipyramids. According to the method, chloroauric acid solutions are added into dodecyl trimethyl ammonium bromide solutions and sodium borohydride solutions for obtaining hydrosol of nanoscale gold particles, the hydrosol serves as seed solutions, and then the seed solutions are added into growth solutions for generating gold nanoparticle bipyramid particles; the preparation process is simple, the reaction condition is mild, and few cheap chemical reagents except for chloroauric acid are used.

The invention discloses a bentonite waterproof paint and a production method thereof. The paint is composed of the components of: 40-55 parts of mixed asphalt, 5-7 parts of nano-grade bentonite, 1-7 parts of a styrene-butadiene rubber solution, 0.2-0.7 parts of mica powder, 0.1-0.5 parts of dodecyl trimethyl ammonium bromide, and 40-55 parts of deionized water. The particle size of the nano-grade bentonite is 20-100mm. When the paint is used in construction under a temperature below -15 DEG C, the components are: mixed asphalt 35-55%, the nano-grade bentonite 6-20%, and diesel oil 34-50%. The paint is advantaged no toxicity, no odor, cold construction, high work efficiency, low cost, and good mechanical performances. The method is advantaged in no three-waste pollution during productions. The paint can be used in roofing plate calking, plate surface coating, old roofing repairing, underground water proofing and damp proofing, washroom leakage preventing, wood decay preventing, and road paving.

The invention discloses temporary blocking fluid for steering acid fracturing of carbonate rocks. The temporary blocking fluid comprises water, lignocellulose, high-temperature-resistant anti-saturation salt modified starch, super absorbent resin, sodium dodecyl sulfate and dodecyl trimethyl ammonium bromide, and the mass ratio of the water, the lignocellulose, the high-temperature-resistant anti-saturation salt modified starch, a starch grafted acrylate water-absorbing expansion material, sodium dodecyl sulfate and dodecyl trimethyl ammonium bromide is 100: (0.1-0.3): (0.1-0.3): (0.1-0.3): (1.0-2.0): (1.0-2.0). The blocking pressure bearing ability of the temporary blocking fluid is greater than 39 MPa, the temperature resistance reaches 140 DEG C, reverse discharge is facilitated, and the temporary blocking fluid has good application potentiality and high market value.

The invention discloses a method for preparing hydrophobic white carbon black. The method comprises the steps of drying precipitated white carbon black to constant weight, then mixing with a modifier solution, adjusting a pH value to 8; and at a temperature of 30-90 DEG C, stirring for a reaction for 20-100 min with a stirring speed of 250-450 rpm, then filtering, and drying to obtain the hydrophobic white carbon black. The modifier is selected from one or more of cetyltrimethylammonium chloride, hexadecyltrimethylammonium bromide, dodecyltrimethylammonium chloride, and dodecyltrimethylammonium bromide. The activation degree of the modified white carbon black is obviously improved and can reach 95% or more, and the modified white carbon black is the hydrophobic white carbon black. The method of the invention is simple in process, has the solvent with cleanliness and no pollution; and the modified white carbon black has the hydrophobic property improved significantly, and thereby being beneficial to improving compatibility when adding into rubber and plastics.

The invention relates to a high-flux anti-pollution polyamide composite reverse osmosis membrane and a preparation method thereof. The reverse osmosis membrane comprises an aromatic polyamide composite reverse osmosis membrane, and a hydrophilic layer which is formed by dehydrating and condensing reaction of a surface active acyl chloride group of the aromatic polyamide composite reverse osmosis membrane and an amino group in an amine-terminated polyhydroxy compound, wherein the water flux is increased by 13 to 30 percent compared with that of an initial aromatic polyamide composite reverse osmosis membrane; after the reverse osmosis membrane is polluted by bovine serum albumin for the first time and cleaned, the water flux recovery rate is 88.5 to 92.4 percent of the water flux of the initial non-polluted membrane; and after the membrane is polluted by dodecyltrimethylammonium bromide for the first time and cleaned, the water flux recovery rate is 90.3 to 93.5 percent of the water flux of the initial non-polluted membrane. The reverse osmosis membrane provided by the invention has the characteristics of high separating property, pollution resistance, high water flux, easiness in cleaning and the like, and the preparation method is simple and easy to operate.

The invention belongs to the field of laser direct structuring composite materials and discloses a laser direct structuring PC / ABS composite material with an excellent thermo-oxidative aging resistance, as well as a preparation method and application thereof. The composite material comprises the following components in percentage by weight: 60-80% of a PC / ABS base material, 5-15% of a halogen-free flame retardant, 5-15% of laser activated particles, 0-10% of heat conductive inorganic filler and 0-5% of other additives. The preparation method of the laser activated particles comprises the following steps: dropwise adding an alcohol solution of nano copper powder, an imitator and a silane coupling agent into a positive microemulsion consisting of acrylate monomer, dodecyltrimethylammonium bromide and water; and heating for reaction, filtering and drying to obtain the laser activated particles. Metal copper is modified by a micro-emulsion polymerization method to obtain the laser direct structuring PC / ABS composite material which has good laser-induced electroplating performance and excellent thermo-oxidative aging resistance.

The invention relates to a coprecipitation-rheological phase preparation method of rare earth-doped yttrium aluminum garnet fluorescent powder, which comprises the following steps of: preparing a precursor, taking nanometer / micrometer YAG, SiO2 or SiC as a seed crystal and adjusting the seed crystal, the precursor and a dispersing agent into a rheological phase; then washing and removing impurities in the fluorescent powder through high-temperature heat treatment; and taking ammonium sulfate, polyethylene glycol, hydroxyethyl cellulose or dodecyltrimethylammonium bromide as the dispersing agent, taking deionized water, ethanol, acetic acid or oxalic acid as a rheological phase solvent and adding the seed crystal to reduce the reaction and activation energy and improve the luminous intensity through doping. The coprecipitation-rheological phase preparation method is suitable for the preparation of LED (Light-Emitting Diode) fluorescent powder, trichromatic fluorescent powder, long afterglow fluorescent powder and PDP (Plasma Display Panel) fluorescent powder. The grain size of the fluorescent powder prepared by the invention is between nanometer and micrometer and can be adjusted through the seed crystal and the calcination temperature. The method has the advantages of simplicity, low equipment cost and large treatment amount and is suitable for the preparation of the fluorescent powder for various indication, display or illumination.

The present invention provides a preparation method of a sandwich-structured nano-adsorbent of carbon-coated magnesium oxide. The method comprises the following steps: (1) adding magnesium chloride hexahydrate, dextrose monohydrate, and a carbonaceous material to ethanol water solution, and stirring the mixture well, wherein the carbonaceous material is at least one of hexadecyl trimethyl ammonium bromide, polyethylene glycol, ethylenediamine tetraacetic acid, polyvinylpyrrolidone, and dodecyl trimethyl ammonium bromide; (2) adding aqueous ammonia solution to the product obtained from the step (1), stirring the mixture to form magnesium salt slurry; and (3) subjecting the product obtained from the step (2) to a reaction at 100 to 250 DEG C for 10 to 36 hours, removing the supernatant after cooling, conducting centrifugal washing on the resulting precipitate, and calcining the precipitate at 250 to 600 DEG C for 2.0 to 6.0 hours under nitrogen conditions, so as to obtain the sandwich-structured nano-adsorbent of carbon-coated magnesium oxide. The adsorbent obtained by the present invention has the advantages of high adsorption capacity and high efficiency, and breaks the industrial application of inorganic nanomaterials in the technical field of water treatment.

The invention discloses a clay / rubber nano composite material prepared from compound modified clay. A preparation method comprises the following steps: adding a cationic modifying agent into inorganic clay, adding an anionic modifying agent after a period of time to prepare compound modified organic clay, and then mixing the compound modified organic clay with rubber and a compounding agent to obtain a rubber and clay nano composite material, wherein the cationic modifying agent is dodecyltrimethylammonium bromide, octadecy trimethyl ammonium bromide or cetyl trimethyl ammonium bromide; the anionic modifying agent is sodium dodecyl sulfonate or sodium dodecyl benzene sulfonate; and 10 parts by mass of organic clay is added into 100 parts by mass of the rubber. Results show that compared with a nano composite material which is prepared from the clay modified by a single cationic modifying agent, the clay / rubber nano composite material prepared from the compound modified clay, disclosed by the invention, has a better micro phase structure and comprehensive mechanical performance.

The invention discloses a compound gas hydrate anti-agglomerant and an application thereof. The anti-agglomerant is prepared by compounding a polyalcohol nonionic surfactant and a quaternary ammonium salt compound, wherein the polyalcohol nonionic surfactant is one or a combination of more of span-20, span-40, span-60, span-65, span-80 and span-85; and the quaternary ammonium salt compound is one or a combination of more of tetrabutylammonium bromide, tetraamylammonium bromide, dodecyltrimethylammonium bromide, dodecyltrimethylammonium chloride, tetradecyltrimethylammonium chloride, cetyltrimethylammonium chloride, dioctyldimethyl ammonium chloride and didecyldimethyl ammonium chloride. The anti-agglomerant is applied to a separation process of a mixed gas by a water / oil emulsion system in the conditions of mixed transportation of an oil-gas-water three-phase system and hydrate generation. Under the influence of supercooling degree and operation conditions, the compound gas hydrate anti-agglomerant disclosed by the invention has the advantages of small dosage, good performance, economy and environmental friendliness, wide application range, good recycling property and the like and has a broad market prospect.

The invention discloses a rapid preparation method of rod-like nano-hydroxyapatite. The method comprises the following steps: (1) reacting dodecyl trimethyl ammonium bromide with disodium hydrogen phosphate; (2) dropwise adding a calcium salt solution into the mixed solution obtained in the step (1) to react; (3) continuing the reaction at the temperature of 120 DEG C; (4) carrying out postprocessing. According to the preparation method of the rod-like nano-hydroxyapatite, disclosed by the invention, the dodecyl trimethyl ammonium bromide serves as a regulating agent; the preparation method is simple, mild and controllable in condition; the rod-like nano-hydroxyapatite with a uniform and controllable size and shape can be obtained. In addition, the dodecyl trimethyl ammonium bromide has good biocompatibility; proven by cell experiments, the rod-like nano-hydroxyapatite provided by the invention can be used for the application research of gene and drug carriers.

The invention discloses a wetting reversal surfactant for drilling fluid. The wetting reversal surfactant is characterized by comprising the following components in percentage by weight: 10 percent of dodecyltrimethylammonium bromide, 15 percent of heavy oil, 20 percent of fatty acid and 55 percent of water. The surfactant does not have influence on the performance of the drilling fluid and has positive charges so as to be mutually absorbed to a hydrophilic rock layer around an oil well with negative charges; the surfactant is adhered to a rock core through a cationic surfactant; the wetting reversal surfactant is covered by a hydrophobic lipophilic group layer; and thus the hydrophilic rock layer is reversed into a lipophilic hydrophobic rock layer to fulfill the aim of replenishing oil and stopping water.

The invention relates to a method for improving the activity of polyphenol oxidase in apples by virtue of hexadecyl trimethyl ammonium bromide and dodecyl trimethyl ammonium bromide, belonging to the technical field of preparation of enzyme catalysts in bioengineering. The method comprises the step of extraction of polyphenol oxidase (PPO) crude enzyme liquid. The method is characterized in that catalytic reaction is carried out by taking polyphenol oxidase as a catalyst in the presence of hexadecyl trimethyl ammonium bromide (CTAB) or dodecyl trimethyl ammonium bromide (DTAB). According to the method, the activity of polyphenol oxidase in the apples is improved by virtue of hexadecyl trimethyl ammonium bromide or dodecyl trimethyl ammonium bromide.

The invention discloses a thermoplastic polyurethane elastomer material. The material is composed of the following raw materials in parts by weight: 1 to 2 parts of dodecyl trimethyl ammonium bromide, 11 parts of stearic acid, 84 parts of thermoplastic polyurethane, 2 parts of methyl silicone oil, 6 parts of titanate coupling agent, 31 parts of acrylic resin, 1 part of phenyl silicone oil, 25 parts of chlorinated polyethylene, 32 parts of calcium carbonate, and 3 parts of hydroxyl silicone oil with a viscosity of 400 centipoises. The thermoplastic polyurethane elastomer material has an excellent wear resistant property and bending resistant property at a low temperature.

The invention relates to the technical field of enzymatic activity, in particular to an apple polyphenol oxidase accelerative activator and application thereof. The apple polyphenol oxidase accelerative activator comprises a mixture of dodecyltrimethylammonium bromide or hexadecyl trimethyl ammonium bromide and a Gemini surfactant according to the weight ratio of 10-2,000: 1-4; and the Gemini surfactant is dibromo-bis(dimethyl dodecyl) pentyl diammonium or dibromo-bis(dimethyl hexadecyl) pentyl diammonium. The invention further provides application of the apple polyphenol oxidase accelerative activator in improvement of apple polyphenol oxidase activity. The apple polyphenol oxidase activity can be increased to be 240%, and the use amount level of the apple polyphenol oxidase accelerative activator is low.

The invention discloses a preparation method of spherical fluorescent powder. In the preparation method, by a hydrothermal method in which ethanol / isopropanol is used as a mixed solvent, under the action of a surfactant dodecyltrimethylammonium bromide, and by using ammonium molybdate, calcium nitrate and europium oxide as raw materials, highly-dispersed uniform spherical CaMoO4:Eu3<+> red fluorescent powder particles are prepared. Through regulation and control of alcohol ratio and reaction conditions, morphologies of the particles are controlled. The preparation method is simple in operation; the spherical fluorescent powder prepared by the preparation method has the characteristics of high sample stability, good luminescent monochromaticity and a uniform spherical morphology; the defects that by the conventional method, the particle size is hard to control, agglomeration is easy and particle distribution is non-uniform are overcome; the preparation method has a certain promotional value and a certain practical application value. The spherical fluorescent powder can be effectively excitated by 250-310 nm and 380-400 nm ultraviolet light, and can be used as red fluorescent powder of a UV-LED and the like.

The invention belongs to the technical field of gas separation and discloses a compound hydrate additive and an application thereof in separation and enrichment of mixed gas. The compound hydrate additive is prepared from amino acid, a hydration enhancer and water, wherein the hydration enhancer is at least one of tetrahydrofuran, tetrabutylammonium bromide, cetyl trimethyl ammonium bromide, dodecyltrimethylammonium bromide, tetraisoamyl bromide or cyclopentane. The compound hydrate additive disclosed by the invention is used as an accelerant for hydrate, is capable of overcoming the defects of poor separating effect and low kinetic performance of a single kinetic accelerant in the separation and enrichment of the mixed gas, and is capable of more effectively separating and enriching a single component in the mixed gas; the separation and purification method is simple; the dosage of the additive is less; the energy consumption is low; and the separating speed is high.

The invention discloses a negative electrode additive of an alkaline manganese battery. The negative electrode additive of the alkaline manganese battery comprises 62-66% of zinc powder, 30-36% of 9.2mol / L potassium hydroxide solution, 1-3% of zinc oxide, 0.1-0.2% of polyethylene glycol, 0.1-0.2% of alkylphenol polyoxyethylene ether, 0.1-0.2% of dodecyltrimethylammonium bromide, 0.2-0.3% of indium hydroxide, 0.1-0.5% of cerium oxide, 0.1-0.3% of methyl hydroxyethyl cellulose, 0.1-0.4% of tin powder 0.1-0.2% of bismuth powder, and 0.3-0.8% of potassium dihydrogen phosphate. By virtue of the negative electrode additive of the alkaline manganese battery, the discharging capacity and the average discharging time of the alkaline manganese battery are obviously improved, so that the negative electrode additive is relatively high in market prospect.

The invention discloses a passivator for metal plates. The passivator for metal plates is prepared from, by weight, 1-2 parts of phosphoric acid, 7.8 parts of phosphoric acid, 0.7 part of residue extract of rhizomes of shouliang yam, 1.1 parts of sodium dodecyl sulfate, 2.3 parts of vinyl trimethoxy silane, 0.9 part of dodecyltrimethylammonium bromide, 8.4 parts of etidronic acid, 1.2 parts of sodium alkyl succinic ester sulfonate, 0.7 part of sodium aluminate and 36 parts of deionized water. The passivator for metal plates can be used for passivating treatment of metal, a uniform passivating protection film can be formed on the surface of metal, and the protection film has excellent rust-proof performance, abrasion resistance, corrosion resistance, heat resistance, cold resistance and weather resistance and is good in surface smoothness.

The invention discloses a composite demetalization agent and a preparation method thereof. The composite demetalization agent solves the problem that the existing composite demetalization agent cannot remove porphyrin compounds of metals such as nickel and vanadium and has a large use amount. The composite demetalization agent comprises 10 to 80wt% of a demetalization agent, 1 to 20wt% of a dispersing agent, 1 to 20wt% of a cosolvent and 10 to 50wt% of a demulsifier. The demetalization agent is a mixture of an organic acid and any one of precipitators and chelating agents. The dispersing agent is dodecyl trimethyl ammonium chloride or dodecyl trimethyl ammonium bromide. The cosolvent is selected from ethylene glycol butyl ether, diethylene glycol butyl ether and diethylene glycol monobutyl ether.

The invention provides an emulsified diesel fuel additive with energy conservation and smoke abatement effects, wherein the constituents include dodecyl trimethyl ammonium bromide, sorbitol olein, oleinic acid, sodium hydroxide, organic salts containing Fe and Cu.

The invention discloses a deodorant, which comprises the following raw materials in parts by weight: 15-20 parts of citronella extract, 15-20 parts of ethanol, 10-15 parts of polyethylene glycol, 7-10 parts of eucalyptus oil, mandala 5-10 parts of Luo extract, 5-10 parts of citric acid, 1-2 parts of lauryl methacrylate, 0.5-1 part of chitosan, 0.2-0.5 part of dodecyltrimethylammonium bromide. The deodorant of the present invention has the advantages of simple composition, good deodorizing performance and long-term deodorizing technical effect, uses pure natural vegetable oil to extract essential oil to purify air, decomposes and removes odor, and can be used in public toilets, garbage stations and farms , Sewage treatment plants and other large-area odor sources deodorization.

The invention relates to an anti-static thermoplastic polyurethane elastomer. The anti-static thermoplastic polyurethane elastomer comprises the following components in parts by weight: 70 to 80 partsof polyhexamethylene adipate glycol, 45 to 50 parts of p-phenylene diisocyanate, 20 to 23 parts of dodecyltrimethylammonium bromide, 10 to 13 parts of 1,2-di(4'-hydroxy phenyl)-o-carbadecaborane, 5 to 8 parts of a fire retardant, 4 to 6 parts of an antioxidant, 1 to 2 parts of a lubricating agent and 7 to 10 parts of titanium dioxide powder. According to the anti-static thermoplastic polyurethaneelastomer disclosed by the invention, the original preferable mechanical properties, such as high tensile strength and elongation at break, of the thermoplastic polyurethane elastomer are guaranteedwhile good fire resistance is achieved, and the anti-static thermoplastic polyurethane elastomer has good abrasive resistance, tear resistance, hydrolytic resistance and ageing resistance; according to the environmentally-friendly flame-retardant thermoplastic polyurethane elastomer disclosed by the invention, the V-0 combustion level according to the thickness measured by UL94 being 3.0 mm can beachieved, and the oxygen index reaches 30 or more.

The invention discloses a preparation method of an intelligent micro-emulsion polymerization salicylic acid molecular imprinted membrane and an application thereof, belongs to the technical field of material preparation. The preparation method particularly refers to a new method for the preparation of the salicylic acid molecular imprinted membrane (MIM) by employing an oil-in-water micro-emulsion polymerization method and with a ceramic alumina membrane as a substrate, an impurity in aspirin-salicylic acid (SA) as a template molecule, 4-vinyl pyridine (4-VP) as a functional monomer, N-isopropylacrylamide (NIPAM) as a temperature sensitive monomer, dodecyltrimethylammonium bromide (DTAB) as an emulsifying agent, toluene as an oil-phase dispersed phase, divinyl benzene (DVB) as a crosslinking agent, and potassium persulfate (KPS) as an initiator. Selective permeability experiments are used for studying selective recognition performance of the prepared molecular imprinted membrane. Results show that the salicylic acid molecular imprinted membrane obtained by the preparation method has excellent salicylic acid molecular recognition performance and intelligent release performance.

The invention relates to the technical field of nanorods, in particular to a gold nanorod. The gold nanorod is prepared from raw materials of a coating agent, and the coating agent is one of dodecyltrimethylammonium bromide, N-dodecyl-N-2-hydroxyethyl-N,N-dimethyl ammonium bromide, N-dodecyl-N,N-dihydroxyethyl-N-methyl ammonium bromide. The invention further discloses a preparation method and application of the nanorod. Three novel cationic surfactants are provided to serve as the coating agent to prepare the gold nanorod, the obtained gold nanorod with the positive charge and pigment molecules with the negative charge achieve an electrostatic adsorption effect, detection of pigment molecules is facilitated, and the nanorod serves as a surface-enhanced Raman spectrum substrate material tobe used for detection of the pigment molecules, and has the advantages of weak background signal intensity, high sensitivity, high reproducibility and the like.