156 results about "Dopamine hcl" patented technology

The invention relates to a method for pretreating fibers, comprising the following steps of: performing surface activation on fibers by a dopamine hydrochloride biomimetic modification method, and then performing impregnation treatment on the fibers by using impregnation solution composed of rubber latex and phenolic resin, aiming to improve the interface adhesion property of the fibers with rubber so that the fibers are more suitable for tyres, conveyor belts, high-pressure rubber tubes and transmission belts. The method solves the experimental problem caused by high toxicity of isocyanate and avoids damage on the fibers caused by high-temperature treatment; and the process flow is simplified and the production cost is reduced.

The invention relates to a carbon nano tube surface functionalization method. The method comprises the following steps of: performing surface coating treatment to a carbon nano tube through a dopamine hydrochloride biomimetic modification method, and performing surface functionalization grafting treatment to the dopamine-modified carbon nano tube through a second functionalization monomer. The method aims to improve the dispersibility of the carbon nano tube in a rubber matrix and the bonding performance of the carbon nano tube with a rubber interface, therefore, the problems of dispersing in the matrix and the poor interfacing bonding of the conventional non-modified carbon nano tube are solved; a series of problems such as damage to the carbon nano tube, environment pollution and complicated technical process, due to strong acid corrosion oxidation treatment in the conventional carbon nano tube surface modification method are prevented; and the technical process is simplified and the produced modified carbon tube is excellent in performance.

The invention provides a folic acid and polydopamine modified tumor targeted mesoporous silica nanoparticle and a preparation method and application thereof. The preparation method particularly comprises the following steps: (1) dissolving mesoporous silica and a chemical in a solvent, performing a full reaction, and performing separation; (2) adding mesoporous silica initial nano-particles obtained in the step (1) in a solution, adding dopamine hydrochloride, performing a full reaction, and performing separation; and (3) adding the dopamine hydrochloride coated mesoporous silica initial nano-particles loaded with the chemical in a weakly basic water solution, sequentially adding a reducing agent and polyethylene glycol modified sulfydryl grafted targeted ligand folic acid, performing a full reaction, then performing separation to obtain the folic acid and polydopamine modified tumor targeted mesoporous silica nanoparticle. The preparation method of the folic acid and polydopamine modified tumor targeted mesoporous silica nanoparticle is simple, and favorable tumor targeting ability, biocompatibility and biodegradability are achieved.

The invention provides a synthetic method and application of a metal-organic framework (MOF) composite nanomaterial. The method comprises the following steps: dispersing ferriferrous oxide magnetic spheres which are synthesized through a traditional hydrothermal technology in a weakly alkaline solution of dopamine hydrochloride to carry out self-polymerization of dopamine on the surfaces of the magnetic spheres; and sequentially dispersing polydopamine coated magnetic spheres in a dimethylformamide solution of zirconium chloride and a dimethylformamide solution of 2-amino-terephthalic acid to obtain the MOF composite nanomaterial with the magnetic sphere surfaces coated with polydopamine and modified with an amino group and with zirconium as a center metal ion. The material has the advantages of large specific surface area, good hydrophilicity and suitable pore structure, can be applied to further researches of the proteomics, and can specifically enrich Which can specifically enrich phosphorylated peptide segments and glycopeptides; the synthetic method is simple and quick; and the synthesized material has good hydrophilicity and biocompatibility, and can be used for selectively enriching endogenous phosphorylation peptide segments and glycopeptide in complex biological samples.

The present invention discloses a super-hydrophobic repairable aqueous coating material, which comprises, by mass, 10-95% of an aqueous matrix resin, 3-80% of a filler capable of producing a micro-nano structure, and 0.5-20% of polydopamine capsules with low surface energy substance covering. The invention further discloses a preparation method of the coating material. According to the present invention, the filler capable of producing the micro-nano structure is adopted, the low surface energy material substance and the dopamine hydrochloride are added to the Tris-HCl solution, stirring, filtering and washing are performed to prepare the filler/low surface energy substance complex, and the filler/low surface energy substance complex and the aqueous matrix resin are mixed to obtain the coating material. The coating of the present invention has characteristics of super-hydrophobicity and superhydrophobic self-repair property.

The invention relates to an ultra-hydrophilic-superoleophobic reduced graphene oxide filtering membrane and use, and belongs to the technical field of separation membrane preparation. First, grapheneoxide and nano-zinc oxide are added to distilled water and ultrasonically dispersed; a dopamine solution containing dopamine hydrochloride is added and mechanically stirred; the mixed solution is thensuction-filtered and deposited onto the surface of a mixed cellulose ester membrane by vacuum suction filtration, and the ultra-hydrophilic-underwater superoleophobic unsupported reduced graphene oxide filtering membrane is obtained by drying and self falling. The reduced graphene oxide membrane has the advantages of high water permeation selectivity, flux and stability, and membrane pollution resistance, can effectively separate oily wastewater, provides an efficient, environmentally friendly and economic technical means, and has important practical significance.

The invention relates to a preparation method for polydopamine-coated polyethyleneimine-stablized gold-nanometer-star photothermal treatment agent. The preparation method comprises the following steps: preparing a gold seed solution from chloroauric acid and sodium citrate; activating mercaptoacetic acid with EDC, then adding an aqueous PEI solution and carrying out a reaction, dialysis, cooling and drying so as to obtain PEI-SH; adding dopamine hydrochloride into a Tris buffer so as to obtain dopamine Tris buffer; adding the gold seed solution into a chloroauric acid solution, adding a AgNO3 solution and an ascorbic acid solution under stirring, adding PEI-SH after stirring reaction and carrying out a reaction so as to obtain AuNSs-PEI; and adding AuNSs-PEI into the dopamine Tris buffer and carrying out stirring and centrifugation so as to obtain the photothermal treatment agent. The preparation method has the advantages of simplicity, mild reaction conditions, easy operation and industrialization prospects; and the prepared star-like nanometer agent has application potential in the fields of CT imaging diagnosis and photothermal treatment of cancers.

The invention discloses a preparation method and application of a polydopamine-modified magnetic nanoparticle, belonging to the technical field of magnetic nanoparticle modification. The preparation method comprises the following steps: preparing Fe3O4 nanoparticles from FeCl3.6H2O, Na3C6H5O7.2H2O and CH3COONa; adjusting the pH value of a Tris solution to 8.0-8.5 by using dilute hydrochloric acidso as to obtain a Tris-HCl buffer solution; adding the Fe3O4 nanoparticles into the Tris-HCl buffer solution for ultrasonic dispersion treatment for 5-10 min so as to obtain a solution A; adding dopamine hydrochloride into the Tris-HCl buffer solution for ultrasonic dispersion treatment for 1-2 min to obtain a solution B; adding the solution B into the solution A, performing a reaction for 10 to 24 h under stirring so as to obtain Fe3O4@PDA particles, collecting the nano-Fe3O4@PDA particles via an external magnetic field, separately washing the nano-Fe3O4@PDA particles with deionized water andethanol twice or more times, and carrying out drying under vacuum to obtain the polydopamine-modified magnetic nanoparticle. The polydopamine-modified magnetic nanoparticle, as a heavy metal adsorbent, has good biocompatibility, high stability, high adsorption capacity and superparamagnetism.

The invention belongs to the field of immobilization of proteins, and relates to preparation and application of a dopamine functional magnetic nano-carrier. The preparation comprises the following steps: firstly, dissolving FeSO4.4H2O and FeCl3.6H2O into distilled water, high-speed stirring and under protection of nitrogen, adding ammonia water of 25% NH4OH, and adding oleic acid; secondly, repeatedly cleaning black precipitates obtained by a stirring reaction and then using a strong magnet to perform precipitation separation, and drying to obtain oleic acid magnetic nano-particles; and finally, adding the oleic acid magnetic nano-particles into a dopamine hydrochloric acid solution, after the reaction is over, using a magnet to separate, cleaning and drying obtained deep brown precipitates, and then the dopamine functional magnetic nano-carrier can be obtained. According to the preparation and application of the dopamine functional magnetic nano-carrier provided by the invention, dopamine hydrochloride is adopted for modifying magnetic oleic acid nano-particles, so that the surface of a magnetic nano-particle has a plentiful of quinonyls and amidogen functional groups, thus proteins can be effectively immobilized; besides, the surface of the carrier has a layer of soft poly dopamine oxide films, the surface area is larger, and the preparation method is simple.

The invention relates to the technical field of preparation of nanometer materials, and discloses a functionalized polydopamine derived carbon layer coated carbon substrate preparation method and application. The preparation method comprises the following steps: 1) immersing a carbon substrate into a trihydroxymethyl aminomethane aqueous solution, the pH value of which is adjusted to be alkaline, and then, reacting with dopamine hydrochloride to obtain a polydopamine coated carbon substrate; 2) carrying out high-temperature carbonization on the obtained polydopamine coated carbon substrate to obtain a polydopamine derived carbon layer coated carbon substrate; and 3) enabling the obtained polydopamine derived carbon layer coated carbon substrate to react with a bimetallic saline solution to obtain a functionalized polydopamine derived carbon layer coated carbon substrate. The functionalized polydopamine derived carbon layer coated carbon substrate is stable in structure, is high in electrochemical activity, and has a series of advantages of high specific capacitance and good rate capability and the like when serving as the electrode material of a super capacitor; and the preparation method thereof is simple and easy to operate.

The invention discloses a method for preparing a high-stability microbial electrochemical sensor. The microbial electrochemical sensor consists of an organic glass or polytetrafluoroethylene container with a volume of 20 to 1,570mL, a 0.1 to 10cm<2> glassy carbon or graphite working electrode, an Ag/AgCl or saturated calomel reference electrode, a 1cm<2> platinum sheet or platinum wire counter electrode and a weak alkaline solution of dopamine hydrochloride. The prepared microbial electrochemical sensor is used for a monitoring system for rapidly acquiring water body composition information in situ, and a monitoring result of the monitoring system in an extreme environment of a high-concentration organic solvent, a strong acid, high temperature and low temperature is true and effective. The method has the beneficial effects that the defect that a conventional microbial electrochemical system cannot run in the extreme environment of the strong acid, high temperature, low temperature, a high-concentration organic solution and the like is overcome by using the microbial electrochemical sensor, and a novel microbial electrochemical system is stable in running and rapid and accurate in detection.

The invention discloses a carbon-doped sodium vanadium phosphate cathode material as well as a preparation method and application thereof. In the cathode material, Na3V2 (PO4)3/C composite particles formed by sodium vanadium phosphate and a first carbon layer is wrapped by a carbon network used as a second carbon layer. The preparation method of the cathode material comprises the following steps:(1) dissolving a carbon source, a phosphorus source, a vanadium source and a sodium source into water, and mixing to obtain a solution; (2) mixing and heating the solution, and drying to obtain driedgel; (3) carrying out two-stage calcination on the dried gel to obtain Na3V2 (PO4)3/C; (4) preparing a buffer solution with a pH value of 8.3-8.7, dispersing the Na3V2 (PO4)3/C and dopamine hydrochloride into the buffer solution, mixing, carrying out solid-liquid separation, and drying to obtain powder; (5) carrying out two-stage calcination on the obtained powder in argon atmosphere to obtain thecathode material. The cathode material has excellent electrochemical properties, and can be used for sodium-ion batteries.

The invention discloses a high-temperature-resistant dopamine-coated barium titanate/polyimide (BT@PDA/PI) dielectric nano composite film. The raw material is composed of 93-99vol% of polyimide (PI) as a matrix and 1-7vol% of dopamine-coated barium titanate nanoparticles (BT@PDA) as a filler, and the volume ratio of the barium titanate (BT) nanoparticles to dopamine (PDA) in the filler is (4-5):1;the preparation method comprises the following steps: reacting in an environment of a hydroxymethyl aminomethane buffer solution (Tris); coating BT nanoparticles with a dopamine hydrochloride solution to prepare BT@PDA nanoparticles with a core-shell structure, mechanically blending the BT@PDA nanoparticles with a PAA solution, defoaming a BT@PDA/PAA blending system in vacuum, coating to form a film, and carrying out high-temperature thermal imidization to obtain the composite dielectric film. According to the invention, the BT nanoparticles are coated by the dopamine layer; therefore, the distribution of BT particles in a PI matrix can be improved, the agglomeration among BT nano particles is reduced, the interface bonding among PI matrixes is enhanced, and the defects inside a compositematerial are reduced, so that the BT@PDA/PI nano composite film obtains excellent dielectric properties while maintaining good mechanical properties.

The invention discloses a nitrogen-doped carbon-coated silicon nanoparticle composite material and a preparation method thereof. The preparation method comprises the following steps that: S1: puttinga silicon nanoparticle of which the grain diameter is 30-50nm in Tris-HCl buffer solution of which the pH (Potential of Hydrogen) is 7.5, cleaning, and drying to obtain processed silicon nanoparticles; S2: adding dopamine hydrochloride into Tris-HCl buffer solution of which the pH is 8.5, and dissolving to obtain dopamine solution; S3: adding the silicon nanoparticle processed in S1 into the dopamine solution obtained in S2, evenly dispersing, carrying out stirring reaction at the room temperature for 1-8 days, and carrying out separation and drying to obtain reactant; and S4: under an inert atmosphere, calcinating the reactant obtained in S3 at a temperature of 700-900DEG C for 1-2h to obtain a composite material. The invention also discloses the application of the above composite material on a lithium battery negative electrode. The composite material synthesized by the preparation method has excellent cycling stability.

The invention belongs to the technical field of a functional high-molecular polymer, and concretely relates to a method for preparing high iron-loading amount polydopamine nanoparticles. The method comprises the following steps: under room temperature, dopamine hydrochloride and a trivalent iron ion compound are added in water, a catechol group of dopamine and iron ion are subjected to a complexation reaction through stirring to form a complex solution; a Tris aqueous solution is added in the complex solution, a polymerization reaction is carried out on a complex through stirring, and generating the polydopamine nanoparticles. The iron-loading amount of PDA NPs is high (as high as 10.26%), and iron-loading amount can be regulated and controlled in a simple mode, and a regulation and control scope is far higher than the product in the prior art.

The invention provides a preparation method of a graphene-carbon nanotube composite material loaded with a nano-copper particle lubricating material. The method comprises the following steps: dispersing graphene oxide and carbon nanotubes into Tris-HCl buffer solution, adding dopamine hydrochloride after uniform dispersion and functionally grafting poly-dopamine onto the surfaces of the graphene oxide and the carbon nanotubes; dispersing a functional graphene oxide/carbon nanotube composite material into ethanol, adding soluble copper salt and adding a reducing agent for a reaction after complete dissolving, so that the copper salt is converted into nano-copper and loaded onto the surface of the graphene-carbon nanotube composite material in situ. According to the method, the graphene oxide and the carbon nanotubes are bionically modified by the poly-dopamine; the preparation process is simple; the graphene oxide and the carbon nanotubes can be organically combined together by the poly-dopamine; abundant active groups are provided on the surfaces of the graphene oxide and the carbon nanotubes. The composite material can not only be uniformly and stably dispersed into polar base oil, but also have excellent wear-resisting and friction-reducing effects.

The invention discloses a dopamine crosslinked gelatin liquid absorbing hemostatic sponge and a preparation method thereof. The preparation method of the hemostatic sponge comprises the following steps: grafting carboxylated pluronic to gelatin to obtain super-hydrophilic modified gelatin, taking dopamine hydrochloride as the crosslinking agent, oxidizing super-hydrophilic modified gelatin in the presence of a strong oxidant, adding medical auxiliary materials, and carrying out mechanical foaming and freeze-drying to obtain the sponge like gelatin liquid absorbing hemostatic dressing. The provided dopamine crosslinked gelatin liquid absorbing hemostatic sponge can be used as a sponge like medical dressing, which has a sponge like appearance and many small pores. The dressing is soft, can be directly used without infiltration, has a high biocompatibility, can be used with thrombin together, can be completely and biologically decomposed, is capable of absorbing liquid quickly, stopping bleeding immediately, and adhering on the wounds, is suitable for absorbing liquid and stopping bleeding in surgeries, and is especially suitable for absorbing liquid in the surgery of eyes.

The invention discloses galactosamine and polydopamine modified liver cancer targeting nanoparticles as well as a preparation method and application thereof. The preparation method of the galactosamine and polydopamine modified liver cancer targeting nanoparticles comprises the following steps: taking polymer and a hydrophobic medicine, dissolving the polymer and the hydrophobic medicine into an organic solvent, stirring, dropwise adding the obtained solution into TPGS aqueous solution, stirring, carrying out reduced pressure volatilization, centrifuging, and abandoning supernate, so that polymer initial nanoparticles carrying the hydrophobic medicine are obtained; resuspending the initial nanoparticles in Tris buffer solution, adding dopamine hydrochloride for reacting, and centrifuging, so that hydrophobic-medicine-carrying nanoparticles wrapped by polydopamine are obtained; dispersing the hydrophobic-medicine-carrying nanoparticles wrapped by polydopamine into weakly alkaline aqueous solution, adding a liver cancer targeting ligand galactosamine, reacting, centrifuging, and carrying out freeze drying, so that the galactosamine and polydopamine modified liver cancer targeting nanoparticles are obtained. The preparation method of the galactosamine and polydopamine modified liver cancer targeting nanoparticles is simple and pollution-free; and the galactosamine and polydopamine modified liver cancer targeting nanoparticles have good liver targeting property, biological compatibility and biological degradability, can be used for targeting liver cancer and has treatment effect.

The invention relates to a method for improving the stability of a magnetic nanoparticle contrast agent. The method comprises the following step: coating the magnetic nanoparticles with poly dopamine. The invention adopts a simple and green synthesis method to obtain the magnetic nanoparticles coated with poly dopamine. The employed raw materials are cheap and easily available; and the synthesis method is simple. The method provided by the invention realizes controllable coating on thickness of magnetic nanoparticles by simply controlling the weight ratio of magnetic nanoparticles and dopamine hydrochloride.

The invention relates to a simple preparation method of a graphite and/or silicon negative electrode material with the surface coated with carbon. The method comprises the steps that dopamine hydrochloride, water and alkaline matter are used for preparing a dopamine buffer solution, natural spherical graphite and/or silicon and the dopamine buffer solution are mixed, stirred for 0.1-96 hours at the temperature ranging from 10 DEG C to 100 DEG C, filtered and dried to obtain graphite and/or silicon coated with a dopamine precursor, the graphite and/or the silicon coated with the dopamine precursor is carbonized for 0.1-96 hours at the temperature ranging from 200 DEG C to 3500 DEG C under the protection of inert gases, and finally modified graphite and/or modified silicon evenly coated with amorphous carbon is obtained. The coating method is easy, convenient and low in operating cost and has great industrial prospect. Compared with an existing coating method, the method has the advantages that a coating layer is uniform, and the coating rate is high; moreover, the thickness of the coating layer can be accurately controlled by adjusting the concentration of the dopamine solution and the stirring time so that the optimum thickness of the graphite coated with the amorphous carbon can be obtained after optimization.

The invention provides a bowl-shaped carbon material and a preparation method thereof, and point-line-plane three-phase composite conductive paste. The preparation method of the bowl-shaped carbon material comprises the steps of (1) adding a block copolymer F127 and dopamine hydrochloride into a mixed solution of deionized water and ethyl alcohol in sequence, and next, dropwise adding trimethylbenzene thereto to obtain a mixed solution A; adding ammonium hydroxide to the mixed solution A in a stirring condition, and performing continuous stirring to obtain a mixed solution B; washing the mixedsolution B by the mixed solution of deionized water and ethyl alcohol to remove the block copolymer F127, and performing filtering to obtain polydopamine granules; (2) uniformly dispersing the polydopamine granules into the mixed solution of deionized water and ethyl alcohol, and performing a hydrothermal reaction in a sealing condition; and (3) performing calcining treatment on the product obtained in the hydrothermal reaction in inert atmosphere. The invention also provides the point-line-plane three-phase composite conductive paste comprising the bowl-shaped carbon material; and when the paste is used as the conductive agent of the battery, the battery performance can be improved effectively.

The invention belongs to the technical field of natural polymer chemistry and in particular discloses a preparation method of a high-strength antioxidation chitosan/polydopamine composite hydrogel. Basic components of the composite hydrogel comprise chitosan and polydopamine. The method comprises the following steps: taking a mixed aqueous solution of LiOH, KOH and urea as a solvent, adding the chitosan into the solvent, and performing freeze thawing to obtain an alkaline chitosan solution; adding an appropriate amount of dopamine hydrochloride and/or epoxy chloropropane, stirring pregel, performing coagulation in water, a 70% alcohol aqueous solution or an industrial alcohol, and performing washing so as to obtain the hydrogel. The hydrogel disclosed by the invention has excellent mechanical properties, antibacterial activity and oxidation resistance, and is non-toxic, harmless, high in safety and biodegradable. The hydrogel disclosed by the invention has wide application prospects in the fields of medicines, cosmetics, environmental protection and the like, and the production process is simple, convenient and pollution-free.

The invention discloses a synthetic method of a pH-response doxorubicin-dopamine conjugate and a prodrug nano particle thereof. The synthetic method comprises the steps of synthesizing a tertiary butyl-2-(3-(3,4-dihydroxyphenyl) propionyl) diamine carboxylic ester through 3,4-dihydroxyphenyl propionic acid; removing t-butyloxycarboryl through the tertiary butyl-2-(3-(3,4-dihydroxyphenyl) propionyl) diamine carboxylic ester for synthesizing 3-(3,4-dihydroxyphenyl) propanohydrazide; reacting the 3-(3,4-dihydroxyphenyl) propanohydrazide with doxorubicin hydrochloride for synthesizing a doxorubicin-dopamine conjugate molecule; synthesizing the doxorubicin-dopamine conjugate molecule and dopamine hydrochloride to obtain the doxorubicin-dopamine prodrug nano particle. Compared with the prior art, the invention provides a simple and effective way for preparing the doxorubicin-dopamine conjugate molecule and the doxorubicin-dopamine prodrug nano particle, and provides an experiment platform for obtaining a molecular drug carrier with integration of pH responsiveness, photothermal therapy and chemotherapy.

The invention discloses a preparation method of modified carbon nanotubes for a proton exchange membrane. The preparation method comprises the following steps: firstly, preparing the ethanol solution of dopamine hydrochloride, introducing a protective gas, dropwise adding ammonia water, adding 1,3-propyl sultone for reflux reaction, and then orderly performing filtering, ethanol cleaning and drying to obtain sulfated dopamine; dispersing carbon nanotubes in the buffer solution of tris(hydroxymethyl) aminomethane hydrochloride, adding the sulfated dopamine for reacting, and then centrifuging to obtain the precipitation of the lower layer, and drying to obtain the modified carbon nanotubes. According to the preparation method, the carbon nanotubes are covered with a layer of sulfated dopamine, so that the interface bonding force of the carbon nanotubes and the matrix of the proton exchange membrane can be increased, the proton electrical conductivity of the membrane is improved by use of a proton conduction channel formed by the sulfated carbon nanotubes, and meanwhile, the methane permeability of the membrane is improved by virtue of excellent dispersion of nanoparticles in the matrix.