643 results about "Polyaniline composite" patented technology

The invention discloses an oxidized grapheme/polyaniline super capacitor composite electrode material and the preparation method and the application thereof. The preparation method comprise the following steps: firstly, adding oxidized graphite to water for ultrasonic dispersion so as to form an oxidized grapheme solution with uniformly dispersed single pieces; at room temperature, dropping aniline to the obtained oxidized grapheme solution for continuous ultrasonic dispersion to from a mixed solution; at a low temperature condition, adding hydrogen peroxide, ferric trichloride and a hydrochloric acid solution dropwise to the mixed solution, and stirring the solution for polymerization; and after the reaction is finished, centrifugating, washing and roasting the obtained mixed solution in vacuum to obtain the oxidized grapheme/polyaniline super capacitor composite electrode material which is used as the electrode material of an electricity storage system of a super capacitor and a battery. The oxidized grapheme/polyaniline super capacitor composite electrode material with good electrochemistry performance is obtained by the method, and the specific capacity of the oxidized grapheme and the polyaniline is greatly improved. In addition, the addition of the oxidized grapheme improves the charge and discharge service life of the polyaniline.

The invention discloses graphene-organic acid doped polyaniline composite material and a preparation method thereof. The preparation method includes the following steps: adding graphite oxide to dispersing agent for ultrasonic dispersion to form evenly dispersed graphene oxide liquid mixture; adding aniline monomer to the liquid mixture obtained in the first step for further dispersion under room temperature to form liquid mixture, and then blending for certain time; gradually dripping oxidizer and organic doping acid to the liquid mixture obtained in the second step, and blending for polymerization; centrifuging the liquid mixture obtained in the third step, and washing to get graphene oxide-polyaniline composite material; adding concentrated alkaline to the water suspension of the graphene oxide-polyaniline composite material, heating and blending for reaction; and centrifuging the mixture obtained in the fifth step and washing to get graphene-polyaniline composite material. The invention takes the advantage of the big specific surface area of graphene oxide and the capability of the graphene oxide for absorbing aniline on the surface thereof in on organic system to form sandwiched polyaniline/ graphene oxide- polyaniline compound through polymerization.

The invention provides a preparation method of a polyaniline/graphene/nano nickel composite material, and relates to the preparation method of the polyaniline composite material, in order to solve the problem that the polyaniline has no electrochemical performance. The preparation method comprises the following steps: 1, preparing a graphene oxide solution; 2, preparing composite powder in a graphene carrying nano nickel manner; and 3, preparing the polyaniline/graphene/nano nickel composite material. The method provided by the invention is simple, convenient and easy to implement, low in cost and high in yield, thereby being suitable for mass production. The method is applied to the field of chemical industry.

The invention provides a preparation method of a graphene/CoFe2O4/polyaniline composite absorbing material. The preparation method comprises the following steps in sequence: preparing the graphene by adopting multi-walled carbon nanotubes with diameter of 30 to 50 nanometers as the raw materials; preparing the CoFe2O4 through a sol-gel auto-combustion method by adopting the Co(NO3)2.6H2O and Fe(NO3)3.9H2O as the raw materials; and then preparing the graphene/CoFe2O4/polyaniline composite absorbing material through an in-situ polymerization method by adopting the prepared graphene, CoFe2O4 and aniline monomer as the raw materials. The composite material is higher in conductivity, magnetic performance and stability, and brings important applications in the microwave absorbing field and the electromagnetic shielding field.

The invention provides a method for preparing magnetic ferroferric oxide/conductive polyaniline light-weight composite hollow microspheres, which relates to a method for preparing a magnetic ferroferric oxide/conductive polyaniline composite material. The invention solves the problems of high density and easy agglomeration of the traditional magnetic nanometer particle/conductive polymer composite material. The method comprises the following steps of: regulating ferrous chloride and ferric chloride solutions to be alkaline, adding sodium dodecyl benzene sulfonate and reacting to obtain ferroferric oxide; and modifying hollow glass microspheres by using poly(diallyldimethylammonium chloride) solutions after alkaline cleaning, then reacting the hollow glass microspheres with the ferroferric oxide, sequentially immersing obtained solid particles by using the poly(diallyldimethylammonium chloride) solutions and polystyrene sulfonic acid solutions, then adding the solid particles to aniline solutions, initiating polymerization by using ammonium persulfate, and washing and drying the solid particles to obtain the composite hollow microspheres. The composite hollow microspheres have both conductivity and magnetism, the density is 0.78-0.8g/cm<3>, and the composite hollow microspheres are not easy to agglomerate and are used for fields of military equipment stealth technology and civil anti-electromagnetic radiation.

The invention discloses a preparation method of a three-dimensional reduced graphene oxide/polyaniline composite material, which comprises the following steps: 1) uniformly stirring a graphene oxide raw material and deionized water in a reactor to obtain a graphene oxide dispersion solution; 2) adding aniline, stirring uniformly, adding medium acid, stirring uniformly under ice bath conditions, and adding an initiator; filtering the reaction product, washing the filter residue, and drying to obtain a graphene oxide/polyaniline composite material; and 3) uniformly mixing the graphene oxide/polyaniline composite material with the graphene oxide dispersion solution, putting in a closed reactor, carrying out hydrothermal reaction to form a three-dimensional reduced graphene oxide polyaniline/composite material aquagel, and drying to obtain the three-dimensional reduced graphene oxide/polyaniline composite material. The polyaniline nano particles are uniformly dispersed among the reduced graphene oxide sheets to form the three-dimensional network-structure composite material. The composite material has the advantages of large specific area, high electric conductivity and high structural stability of polyaniline.

The invention provides a graphene-polyaniline composite material which comprises the following components in percentage by mass: 0.01-99.99% of graphene and 0.01-99.99% of polyaniline. The graphene and the polyaniline are doped to form a composite structure, and the composite structure has a micro or nano porous structure. The invention also provides a preparation method of the graphene-polyaniline composite material. In the graphene-polyaniline composite material, the graphene and the polyaniline are doped to form a porous composite structure, and such a micro or nano porous structure greatly increases the specific area of the composite material. Due to high conductivity and large specific area, the composite material has high specific capacity when being used as an electrode material. The preparation technique is simple and reliable, can effectively lower the technical cost, and has wide application prospects.

A clay ore-carried polyphenylamine composite material is prepared through separating and purifying clay ore, preparing 5-15% suspension mineral slurry, adding phenylamine and hyaluronic acid, stirring while slowly dropping oxidizing trigger, reaction for 6-24 hr while stirring, then filtering and dewatering, washing 2-4 times, and spray-drying or preparing suspension. This composite material possesses both the easy dispersivity of clay mineral and the excellent physico-chemical property of polyphenylamine (conductivity and corrosion-proofness). Its advantages are high dispersity, electric conductivity and corrosion resistance, and low cost.

The invention discloses a method for preparing nano-cellulose crystal/polyaniline composite material and a product thereof. In the method, firstly, the cellulose is hydrolyzed by acid to obtain nano-cellulose crystals, and the suspension of the nano-cellulose crystals spontaneously forms lyotropic cholesteric liquid crystals at a certain concentration. Then, the nanocellulose crystal/polyaniline composite material product with reversible redox properties is prepared by in-situ polymerization reaction of the polyaniline conductive monomer in the nanocellulose crystal cholesteric liquid crystal. The invention has the advantages of low cost, simple synthesis method, high production efficiency and the like.

The invention relates to a mixed type electrochemical capacitor, in particular to a mixed type electrochemical capacitor with high-energy density based on directional carbon nanotubes. The mixed type electrochemical capacitor structurally comprises a positive electrode, a negative electrode, a separating membrane and electrolytes, wherein the separating membrane and the electrolytes are arranged between the positive electrode and the negative electrode. The mixed type electrochemical capacitor is characterized in that the positive electrode of the mixed type electrochemical capacitor is composed of a directional carbon nanotube array directly growing on a conductive substrate and manganese oxide or polyaniline composite materials; the negative electrode of the mixed type electrochemical capacitor is composed of a modified directional carbon nanotube array or a directional carbon nanotube array directly growing on the conductive substrate and polypyrrole composite materials; the electrolytes of the mixed type electrochemical capacitor are nonaqueous electrolytes. The mixed type electrochemical capacitor has energy density capable of being compared to a secondary battery, and meanwhile has high power density and cycling stability. The current problem of energy shortage can be eased, and the mixed type electrochemical capacitor has high practical value, wide market prospect and considerable economic and social benefits.

The invention relates to a titanium carbide/polyaniline composite material and a preparation method thereof. The preparation method comprises the following steps: firstly, adding a two-dimensional layered nano material MXene-Ti3C2 into a hydrochloric acid solution, and uniformly dispersing to obtain a Ti3C2 mixed solution; then adding aniline into the Ti3C2 mixed solution, and uniformly dispersing to obtain a mixed solution, wherein the ratio of the aniline to the two-dimensional layered nano material MXene-Ti3C2 is (0.1 to 0.3)mL to (100 to 600)mg; at 0 to 5 DEG C, adding a catalyst into a mixed solution A drop by drop, carrying out stirring polymerization till the mixed solution is gradually changed from a transparent solution into a uniform black solution, and carrying out washing and drying to obtain the titanium carbide/polyaniline composite material. According to the preparation method, by low temperature stirring treatment at 0 to 5 DEG C, the PANI/Ti3C2 composite material is prepared, and the problem that Ti3C2 is easy to oxidize at high temperature is improved, and the composite material with a uniform load can be obtained.

The invention relates to a graphene polyaniline composite and a preparation method and application thereof. The composite comprises graphene and polyaniline, wherein polyaniline is dispersed on a layered structure of graphene, and mass percentage of graphene in the composite is 10 to 80%. The graphene polyaniline composite prepared by using the preparation method has a dendritic structure, which enables the purpose of bonding of electrode materials to be achieved; due to existence of graphene, the composite can be used as a conductive agent, so usage of a traditional binder and a tradition conductive agent can be avoided when the composite is applied in fabrication of electrode slices, and thus specific capacity of the electrode slices is substantially improved and energy density of the electrode slices is high.

The invention discloses a method for preparing ultra-high molecular weight polyethylene/polyaniline composite conductive fibre, comprising the steps of: performing low-temperature oxygen plasma treatment on ultra-high molecular weight polyethylene fibre, wherein surface impurities of the fibre are removed, the treatment time is 0.5-1.5 minutes, the reaction power is 50-80W and the oxygen pressure is 30-50Pa; placing the fibre in aniline monomers for 0.5-2 hours, uniformly extruding the fibre after taking out the fibre, and controlling the mass ratio of the fibre and the aniline monomer at 1:1 to 1:1.3; and placing the fibre in a reaction solution at 10-35 DEG C for 0.5-3 hours, so that the fibre containing a uniform and continuous polyaniline conductive layer is obtained. By the method disclosed by the invention, the composite fibre with good conductivity is obtained, textiles or fibre reinforced composites with antistatic, conductive and electromagnetic shielding functions can be prepared, and are applied to fields of individual protection, military industry, electric products, petrochemical industry, machineries and the like.

The invention discloses a porous graphene/nickelous hydroxide/polyaniline composite electrode material and a preparation method thereof, belonging to the technical field of nano composite materials and electrochemistry. The composite electrode material is composited by porous graphene, nickelous hydroxide and polyaniline, and has a porous structure; the nickelous hydroxide is deposited on the porous graphene by the binding effect of holes; the polyaniline is combined with the surface of the graphene by pi-pi mutual effect and is deposited on the surface of the porous graphene. The particle diameter of the nickelous hydroxide is 20-150nm; the specific surface area of the porous graphene is 350-450m<2>/g, the conductivity is 20-60S.m-1, and the weight loss in the temperature of 900 DEG C is 4-6wt%. The obtained porous graphene/nickelous hydroxide/polyaniline composite electrode material has the advantages that the oxidation and reduction performances are good, the specific capacitance is up to 2480F/g, and after the charging and discharging circulate for 2000 times, the specific capacitance is maintained to be about 90% still.

The invention provides an MXene-polyaniline composite material and a preparation method thereof, relates to a preparation method of the MXene-polyaniline composite material and aims to solve the technical problem of poor wave absorbing performance of the conventional two-dimensional transition metal carbide MXene. The MXene-polyaniline composite material comprises laminated two-dimensional transition metal carbide and a polyaniline shell coating the surface of the two-dimensional transition metal carbide. The preparation method comprises the following steps: aniline is added to water and stirred, an aniline/water dispersion liquid is obtained, the pH value is regulated to 1.5-2, and a hydrochloride solution of aniline is obtained; the hydrochloride solution of aniline is added to the water dispersion liquid of the two-dimensional transition metal carbide and is stirred and mixed at a low temperature, and an MXene-aniline mixed solution is obtained; an ammonium persulfate solution is added dropwise to the MXene-aniline mixed solution, the mixture is subjected to a stirring reaction at a low temperature, a product is washed and dried, and the MXene-polyaniline composite material is obtained. The MXene-polyaniline composite material can be applied to the field of wave absorption.

The invention relates to a preparation method of a lanthanum-doped barium ferrite-polyaniline composite material microwave absorbent. Lanthanum-doped barium ferrite is prepared from nitrate of barium, ferrum and lanthanum and an aniline monomer which serve as main raw materials by a sol gel-self-propagating method; and a lanthanum-doped barium ferrite-polyaniline composite is prepared by an in-situ chemical oxidation method. Due to organic composition of the lanthanum-doped barium ferrite and the polyaniline, advantages of the two components can be maintained; electromagnetic parameters of a material can be cut; microwave absorption frequency band is widened; the material density is reduced; absorption efficiency is improved; comprehensive properties are improved; the problems of high thickness, heavy weight, narrow frequency band, low absorbability and the like of the single ferrite wave-absorbing material are solved; thin, light, wide and strong requirements of a wave-absorbing coating are met; and the lanthanum-doped barium ferrite-polyaniline composite material microwave absorbent is an ideal and high-performance microwave absorbent.

The invention relates to a manufacturing method of polyaniline composite nano fiber membrane optical sensor and a detection method thereof. The manufacturing method includes: eigenstate polyaniline raw material is dissolved; blending polymer is added into polyaniline solution; the solution is subject to electrostatic spinning, so as to prepare nano composite fiber; the nano composite fiber is deposited onto ITO conductive glass, so as to obtain conductive glass deposited with polyaniline composite fiber membrane, namely the polyaniline composite nano fiber membrane optical sensor. The detection method includes that the polyaniline composite nano fiber membrane optical sensor is placed into solution or gas sample containing substance to be detected, and standing and vacuum drying are carried out; a spectral measuring system is utilized to detect reflection and absorption spectrums thereof, Lab colour mode and RGB colour mode are adopted to calculate colour variation value, and the concentration of the detected substance is obtained. The invention has the advantages that equipment is simple, cost is low, no pre-treatment is required to be carried out on sample, detection range is wide, detection sensitivity is high, and real-time detection can be carried out.

Metal-polyaniline (PANI) composites are provided together with a process of preparing such composites by an electrodeless process. The metal of the composite can have nanoscale structural features and the composites can be used in applications such as catalysis for hydrogenation reactions and for analytical detection methods employing SERS.

The invention relates to a novel method for preparing a polyaniline composite conductive fabric. The novel method for preparing a polyaniline composite conductive fabric is characterized in that a conductive fabric with good conductive properties is prepared from a chemical fiber fabric as a matrix material and polyaniline as a conductive material through an in-situ polymerization method (also known as an in-situ adsorption polymerization method). The novel method for preparing a polyaniline composite conductive fabric adopts an ultrasonic dipping treatment process as an auxiliary process of a base fabric dipping process adopting aniline. Therefore, the novel method for preparing a polyaniline composite conductive fabric has good surface modification effects on a base fabric, is beneficial for depositing a conductive material on fiber surfaces of the base fabric in polymerization and enabling the conductive material to permeate into fibers of the base fabric, and improves conductivity and conductive stability. A conductive fabric prepared by the novel method has high conductivity and good environmental stability, is easy for synthesis, and keeps physical and mechanical properties belonging to fabrics on the basis of acquirement of conductive properties, wherein surface resistance R of the conductive fabric is reduced to a value of 1 to 5 kilo-ohm.

A graphene/magnetic particle/polyaniline composite porous wave-absorbing material and a preparing method thereof are disclosed. The composite porous wave-absorbing material comprises, by mass, 5-30 wt% of graphene, 5-20 wt% of magnetic particles, 45-90 wt% of polyaniline and 1-5 wt% of a foaming agent. The composite porous wave-absorbing material is prepared by loading the graphene sheet surfaces with the magnetic particles by a solvothermal method, cladding the graphene sheet surfaces loaded with the magnetic particles with the polyaniline through an in-situ polymerization process, performing heating and foaming by using the foaming agent, and performing high-temperature carbonization. The material has characteristics of a low cost, a simple preparing process, high electromagnetic wave absorption capability, a wide absorption bandwidth, and the like, and has a wide application prospect in sensing techniques, electromagnetic shielding, radar absorption, and other wave-absorbing fields.

The invention relates to a composite superfine fiber wave-absorbing material and a preparation method thereof, relating to the technical field of preparing Fe3O4 through a sol-gel method, the technical field of preparing Fe3O4/polyaniline composite nanoparticles through the situ polymerization method, the technical field of preparing the superfine fiber wave-absorbing material through an electrostatic spinning method and other technical fields. In the method in the invention, the principles of the sol-gel method and situ combination are adopted and the situ polymerization chemical reaction of FeSO4.7H2O, FeCl3, ammonium persulfate and other raw materials is utilized to prepare Fe3O4/polyaniline composite particles with good dispersibility; and then the electrostatic spinning technology is adopted and the drum process is used to receive the obtained superfine fiber wave-absorbing material. In the method in the invention, the defects that the polyaniline is difficult to dissolve, the magnetic loss of the common wave-absorbing material is difficult to control, and the like are overcome. The prepared superfine fiber wave-absorbing material in the invention has high the advantages of strength and machinability, small fiber diameter and uniform distribution and can be widely used in various fields such as electronic screening, military camouflage and civil aviation and the like.

The invention relates to an electromagnetic shielding composite membrane material and preparation and application thereof. The electromagnetic shielding composite membrane material comprises a graphene/carbon nanotube composite membrane (1), a polyaniline membrane (2) and protective layer resin (4). The polyaniline membrane (2) adheres to the surface of a carbon nanotube thin film in the graphene/carbon nanotube composite membrane through an adhesive (3). The preparation includes the steps that graphene suspension liquid is deposited on the carbon nanotube thin film, and the mixture is naturally aired at room temperature to obtain the graphene/carbon nanotube composite membrane; the polyaniline membrane adheres to the surface of the carbon nanotube thin film in the graphene/carbon nanotube composite membrane through the adhesive to form a graphene/carbon nanotube/polyaniline composite membrane; then the upper surface and the lower surface of the composite membrane are coated with the resin, curing is carried out, and the electromagnetic shielding composite membrane material is obtained. The electromagnetic shielding performance of the electromagnetic shielding composite membrane material is excellent, and meanwhile the electromagnetic shielding composite membrane material can bear certain bending and compression deformation; the flexible electromagnetic shielding membrane can be widely applied to the fields such as intelligent wearable garments and multifunctional electromagnetic protection fabric.

The invention discloses a preparation method of zinc oxide/polyaniline composite photocatalyst. The preparation method of the zinc oxide/polyaniline composite photocatalyst comprises the following steps of: respectively preparing nanometer zinc oxide by adopting a direct precipitation method and a hydrothermal method; chemically modifying the surface of the obtained nanometer zinc oxide by silane coupling agent; and compounding the surface-modified nanometer zinc oxide with polyaniline (PANI) to obtain nanometer zinc oxide/polyaniline composite photocatalyst of different morphologies through an emulsion polymerization method. The preparation method disclosed by the invention is simple to operate; the prepared composite photocatalyst has high stability and longer service life for cyclic utilization; moreover, the photocatalytic activity and efficiency of the composite material are improved, the absorption and utilization of zinc oxide to the visible light are strengthened, the utilization rate of the photocatalyst to the sunshine is greatly improved, and the visible light catalytic degradation efficiency is higher, so that the nanometer zinc oxide photocatalyst has an extensive application prospect in organic substance wastewater treatment.

The invention discloses a graphene/polyaniline composite membrane based pH detecting electrode. The graphene/polyaniline composite membrane based pH detecting electrode comprises an electrode body and a graphene/polyaniline composite membrane covering the outer surface of the electrode body, wherein the electrode body is selected from one of an ITO glass electrode, a stainless steel gold plated electrode and a gold disc electrode. The invention also discloses a preparation method of the pH detecting electrode. The preparation method comprises the following steps: (1) pretreating the electrode; (2) preparing electrolyte; and (3) carrying out electrochemical polymerization. The invention also discloses an application method of the pH detecting electrode. The pH detecting electrode is used for detecting the pH of a phosphate buffer solution, oxidation peak potential acts as a detecting signal, and the pH value within the range of 1-11 can be detected. Compared with a common pH detecting electrode, the graphene/polyaniline composite membrane based pH detecting electrode is smaller in size, is lower in price, is more convenient in detection, and does not require special treatment before and after use. The compounding of graphene and polyaniline obviously improves the pH detecting effect of the electrode.

The invention discloses a method for preparing poly-aniline composite ultra-filtration film by in-situ polymerization, belonging to the preparation technique of ultra-filtration composite film. The method process comprises that under the temperature of 20 to 25 DEG C, citric acid, camphor sulfonic acid or hydrochloric acid is added into dodecyl benzene sulfonic acid sodium solution; after the pH value of the solution is adjusted, aniline is added into the solution; after the solution is uniformly mixed, polysulfone membrane is then added into the solution and the solution is then mixed for 4 to 6 hours under the temperature of 20 to 25 DEG C and then for 2 hours under the temperature of 0 to 5 DEG C; water solution of ammonium persulfate with a certain quantity is then added into the solution, and the solution is then mixed for a plurality of minutes under the temperature of 0 to 5 DEG C to complete the reaction. The finished poly-aniline composite ultra-filtration film is gained by a series of cleaning of the prepared poly-aniline composite ultra-filtration film. The method of the invention is simple and has easy operation; the surface of the prepared poly-aniline composite ultra-filtration film is densely and uniformly covered by nano-fibre-shaped polyaniline; the interception performance and the hydrophilicity performance of the poly-aniline composite ultra-filtration film are greatly improved compared with basic films and can be adjusted by controlling the film preparation reaction time.

The invention particularly relates to a preparation method of a polyaniline/graphene water-based epoxy anticorrosive paint by blending a polyaniline composite material and a water-based epoxy resin, belonging to the technical field of anticorrosive paints. In order to solve the problems of lower water resistance and lower corrosion resistance of the coating due to abundant hydrophilic groups in the water-based epoxy resin paint which uses water as the solvent, the invention provides a preparation method of a polyaniline water-based epoxy resin anticorrosive paint. By using the characteristic of large specific area in the graphene, a polymerization-reduction process is utilized to prepare the large-specific-area high-dispersity polyaniline/graphene composite material, and the composite material is blended with the water-based epoxy resin to prepare the anticorrosive coating. The polyaniline/graphene composite material added into the water-based epoxy resin enhances the metallic corrosion potential, quickly conducts electrons formed in the corrosion process, and separates the cathode and anode reaction; a metal passivation layer is formed on the matrix surface to decelerate the metal corrosion; and the composite material with large specific area prolongs the seepage path of oxygen and water molecules to the carbon steel surface, and thus, has excellent barrier properties.

The invention relates to a flexible and tailorable solid super capacitor and a preparation method thereof. The super capacitor uses carbon nanotube/polyaniline composite films as electrodes and a polyacrylamide/lithium chloride hydrogel system as electrolyte and a flexible substrate. The flexible and tailorable carbon nanotube/polyaniline composite electrodes are prepared by depositing polyanilineon carbon nanotube films through electrochemical deposition. The two carbon nanotube composite electrodes are isolated by polyacrylamide/lithium chloride hydrogel prepared in advance. Then, the electrodes are permeated by hydrogel pre-polymerized solution, and crosslinking polymerization is carried out, thus obtaining a flexible and tailorable solid super capacitor with high performance. Comparedwith the prior art, the volume specific capacity of the super capacitor is up to 99F cm<-3>, it takes more than 10 hours to reduce the open circuit voltage to half the original, and the super capacitor shows excellent self-discharge performance. The super capacitor obtained is very flexible, can be bent to any shape, and has no performance degradation even after 5000 times of bending. Therefore,the super capacitor has a broad application prospect in flexible and wearable electronic devices and other fields.