316 results about "Doped polyaniline" patented technology

A gas sensing device (nanosensor) includes a substrate with at least a pair of conductive electrodes spaced apart by a gap, and an electrochemically functionalized semiconductive nanomaterial bridging the gap between the electrodes to form a nanostructure network. The nanomaterial may be single-walled carbon nanotubes (SWNTs) functionalized by the deposition of nanoparticles selected from the group consisting of an elemental metal (e.g., gold or palladium), a doped polymer (e.g., camphor-sulfonic acid doped polyaniline), and a metal oxide (e.g. tin oxide). Depending on the nanoparticles employed in the functionalization, the nanosensor may be used to detect a selected gas, such as hydrogen, mercury vapor, hydrogen sulfide, nitrogen dioxide, methane, water vapor, and/or ammonia, in a gaseous environment.

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 flexible polyaniline conductive composite hydrogel material, and belongs to the technical field of functional polymer materials. According to the method, a flexible conductive material with good mechanical strength and electrochemical property is prepared by utilizing the properties and characteristics of polyatomic acid of phytic acid, by taking the phytic acid as an acid doping agent and a gel crosslinking factor and taking polyvinyl alcohol hydrogel as a skeleton. The method comprises the following steps: dissolving polyvinyl alcohol into water to form a solution and matching the solution with phenylamine and phytic acid at a proportion to form a solution A; dissolving initiating agent ammonium persulfate into water to form a solution B; quickly mixing the solution A and the solution B at a low temperature, so that in situ polymerization is performed on the phenylamine in a polyvinyl alcohol aqueous solution, so as to form phytic acid-doped polyaniline hydrogel; placing the phytic acid-doped polyaniline hydrogel into a refrigerator for freezing, so as to form the flexible polyaniline conductive composite hydrogel material by a cyclic freeze thawing. The flexible polyaniline conductive composite hydrogel material prepared by the method has good electrochemical property, mechanical strength and flexibility; the preparation method is simple, and the cost is low, and the preparation method has wide application prospect in the fields of flexible energy storage materials and biomedicine.

The invention discloses a method for preparing a polyaniline modified neutral conductive filter membrane and belongs to the technical field of conductive filter membrane modification and preparation in the field of conductive composite materials. The method is characterized in that phytic acid with high conductivity is doped with polyaniline under neutral conditions, the low-cost filter material is subjected to conductive modification, and good conductive performance is kept under the neutral conditions. The doped polyaniline is firmly loaded, and the good filtering separation performance of the filter cloth is kept; the conductive performance is improved due to graphene modification; the non-conductive filter material is modified into a filter membrane with high conductivity, the application range of the filter membrane is widened, and the filter membrane is particularly suitable for applying a micro electric field to relieve the membrane pollution and other membrane charging processes. The method has the beneficial effects that the graphene polyaniline is combined with the filter material, and the conductivity of the filter membrane is greatly improved, particularly the conductivity under the neutral conditions; and therefore, the modified low-price filter material is a conductive filter membrane and has wide application prospects in the fields of membrane charging process and water treatment thereof.

The invention discloses a method for preparing a graphene doped polyaniline-based carbon coated nickel zinc ferrite mesoporous material, which combines conductive polymer polyaniline, ferrite and graphene material. The method comprises steps of firstly preparing a nickel zinc ferrite magnetic matrix through a self-propagating combustion method, then preparing graphene doped polyaniline coated nickel zinc ferrite magnetic nanoparticle through an in site polymerization method by taking graphene as the dopant, finally, carbonizing at high temperature and reducing so as to obtain the carbon coated graphene or nickel zinc ferrite nanometer mesoporous material. The graphene doped polyaniline-based carbon coated nickel zinc ferrite mesoporous material prepared by the method can be used as both an electromagnetic wave absorbing material and an environment adsorbing material for adsorbing pollutants such as heave metals, POPs (persistent organic pollutants) and the like in the environment, and has very important value in fields such as military stealth materials, electromagnetic shielding materials and environment adsorbing materials.

The invention discloses a method for improving the conductive thermal stability of a polyaniline/inorganic nano-conductive composite material, which comprises the following steps: a proton acid doped polyaniline/inorganic nano-conductive composite material filter cake is firstly prepared, then the obtained filter cake is carried out the azeotropic distillation treatment, water in the filter cake is removed, and the proton acid doped polyaniline/inorganic nano-conductive composite material is simultaneously transferred into an organic phase. The method easily prepares the proton acid doped polyaniline/inorganic nano-conductive composite material organic dispersion liquid with the excellent dispersion through the azeotropic distillation dehydration and the phase transfer process, thereby reducing the clustering phenomenon of the composite material, improving the dispersion of the composite material in the organic phase and improving the conductive thermal stability of the nano-conductive composite material.

The invention discloses nano-composite electric conduction anticorrosive paint and a preparation method thereof. The preparation method is characterized in that firstly organic acid dodecylbenzene sulfonic acid is used as a doping agent so as to overcome the low solubility of doped polyaniline, a carbon nanotube is used for improving the electric conductivity of composite powder, and then the carbon nanotube is compounded with a precursor of organic acid dodecylbenzene sulfonic acid doped polyaniline and epoxy resin so as to prepare the nano-composite electric conduction anticorrosive paint. According to the technical scheme, the polyaniline/carbon nanotube and the epoxy resin are compounded, so that the excellent characteristics of the polyaniline/carbon nanotube and the epoxy resin are organically combined together. The nano-composite electric conduction anticorrosive paint has relatively high electric conduction performance and very high anticorrosive performance and is relatively low in cost; required processing equipment is simple; the industrialization of the nano-composite electric conduction anticorrosive paint is easy to realize.

A method for preparing carbon allotrope based sulfide detectors comprising first functionalizing a carbon allotrope, such as a single-walled carbon nanotubes or graphene, with a solution of a polynuclear aromatic hydrocarbon-sulfonic acid, such as 1-pyrenesulfonic acid, followed by treatment with a metal, such as gold nanowires or cupric salt doped polyaniline, to give a metal-functionalized carbon allotrope, then drop casting the metal-functionalized carbon allotrope onto an inert surface, such as a silicon dioxide film on a silicon wafer having electrodes. Detection of sulfides may be by means such as photochemical or conductance methods. The hydrogen sulfide detectors may be used to detect and/or quantitate ppb and ppm levels of hydrogen sulfide in industrial settings or in detecting halitosis.

The invention provides coatings useful for preventing corrosion of metals. The coatings comprise a film-forming resin and conductive polymers comprising linearly conjugated π-systems and residues of sulfonated lignin or a sulfonated polyflavonoid or derivatives of sulfonated lignin or a sulfonated polyflavonoid. The invention also provides a latex formulation of the coatings, and articles of manufacture comprising a metal substrate and a coating in contact with the metal substrate.

The process of the present invention is a process to make a conductive fluorinated polymer composition (also called composite) wherein:

• a) an aqueous solution of an anilinium salt is mixed with an aqueous dispersion of a fluorinated polymer,
• b) then an oxidant is added to the mixture of step a) to make a blend of said fluorinated polymer and doped polyaniline (PANI),
• c) by-products and unreacted aniline are removed by washing with water or an alcohol to get a blend of purified fluorinated polymer and doped PANI,
• d) eventually the purified fluorinated polymer and doped PANI of step c) can be mixed with an acid,
• e) water is removed from the purified fluorinated polymer and doped PANI of step c) or d) if any and the remaining powder is melted and shaped in films, pellets or any object.

The invention relates to the technical field of gas-sensitive materials, in particular to a composite resistance NH3 gas-sensitive gas sensor and a preparation method thereof. In the technical scheme, the preparation method for the composite resistance NH3 gas-sensitive gas sensor is characterized by comprising the following steps of: preparing materials, namely preparing large-scale ZnO nanowires without any catalysts by a physical thermal evaporation method, and preparing HCl-doped polyaniline nanotubes by a chemical oxidation method; weighing 10 mass parts of HCl-doped polyaniline nanotubes and 1 to 5 mass parts of ZnO nanowires, grinding powder of polyaniline and zinc oxide in a mortar for half an hour, adding N-methyl pyrrolidone for wet grinding for half an hour, and blending to obtain slurry; coating the slurry on a ceramic tube of which both ends are coated with a gold electrode and a platinum heating wire to obtain a thick film; and drying the thick film in the air for half an hour, and performing heat treatment in a vacuum drying oven at the temperature of 60 DEG C to obtain the gas-sensitive gas sensor.

The invention discloses a transparent electroconductive resin, a color film substrate and its manufacturing method and a liquid crystal display device, relates to the technical field of liquid crystal display, and aims to raise properties of the liquid crystal display device and simultaneously simplify the manufacturing technology of the liquid crystal display device. The transparent electroconductive resin disclosed by the invention contains a transparent matrix resin, organic acid-doped polyaniline and toluene. The color film substrate disclosed by the invention contains a substrate, on which a common electrode formed by the transparent electroconductive resin is disposed. The invention can be applied to the manufacturing field of the liquid crystal display panel.

The invention discloses a doped polyaniline electrode material for a super-capacitor and a preparation method thereof. The method comprises the following steps of: firstly, preparing acid doped polyaniline; then, obtaining eigenstate by contra doping of alkali liquor; and finally, obtaining transition metal ion doped polyaniline by re-doping of transition metal salt solution. The specific capacity of the material in an aqueous electrolyte reaches 350 F/g and the specific capacity reaches 100 F/g in an organic electrolyte, so that the problems that a polyaniline material has small specific capacity and low energy density are effectively solved.

Disclosed is a conductive coating composition containing an organic solvent dispersion of an intrinsically conductive polymer such as a doped polyaniline or a doped polythiophene, and a binder. The conductive coating composition is characterized in that the binder contains a polymerizable monomer-dispersed silica sol, which is obtained by dispersing a colloidal silica into a polymerizable organic compound monomer. The composition provides a conductive thin film having high transparency and excellent strength.

A method to measure redox potentials and concentrations of redox active substances in an aqueous solution is described. The method is based on measurements of transmembrane electric potential through an electroconductive polymer membrane, for example, through a d,l-camphor sulfonic acid (CSA) doped polyaniline (PANI) membrane. Transmembrane electric potential demonstrates good Nernstian response as a function of redox potential in solutions,of the redox couples of Fe²⁺/Fe³⁺ and Fe(CN)₆⁴⁻/Fe(CN)₆³⁻. The membrane gives good response to redox active substances such as L-Ascorbic acid and redox active dyes Neutral red, Nile blue and N-phenylanthranilic acid that do not induce satisfactory response on Pt electrode. The lower detection limits can be as low as 0.2 mM. In the absence of redox processes it is also possible to measure Cl⁻ concentration at least from 0.05 mM to 100 mM.

The invention discloses a washable polyaniline/terylene composite conductive fabric and a manufacture method thereof. The conductive fabric comprises a terylene base cloth which has undergone alkali decrement treatment, wherein, a polyaniline conducting polymer layer is compounded on the terylene base cloth, and the polyaniline conducting polymer layer is prepared by reacting doped polyaniline containing active substituent and aqueous isocyanate. The manufacturing method comprises a step of alkali decrement pretreatment, a step of padding in a hydrochloric acid solution of an oxidizing agent,a step of padding in a reaction solution and low temperature reaction and a step of rinsing. The invention provides the washable polyaniline/terylene composite conductive fabric which is capable of maintaining good conductivity performance for a long time; the invention also provides the manufacture method for polyaniline/terylene composite conductive fabric, and the method has the advantage of asimple process and enables polyaniline to have a strong bonding force on the terylene base cloth.

The invention belongs to the technical field of lithium air cells and particularly relates to a composite air electrode of a lithium air cell and a preparation method thereof. The composite air electrode is a composite multilayer structure comprising a gas diffusion layer, a fluid collecting layer and a waterproof layer; and the composite air electrode structure is formed by adopting a porous foam material as a substrate and using a coating and laminating method, wherein the waterproof layer adopts high-conductivity proton-doped polyaniline. The design of the electrode is good, and the high air diffusivity is retained, so that the cell has better magnification performance, and meanwhile, the waterproof layer of the electrode can effectively prevent water vapor in air from corroding lithium metal.

The invention discloses a preparation method of a novel solvent-free antistatic antibiosis epoxy self-leveling terrace paint, which is characterized in that the bisphenol type A liquid epoxy resin with characteristics of small resistivity, low viscosity, excellent integrated performance and moderate price, an active diluent is added in a formula to reduce the system viscosity, and a conductive filling material selects the zinc oxide whisker or doped polyaniline. The terrace paint has the advantages of excellent antistatic performance, persistence, no influence by time, temperature, humidity and the like; the paint film has the advantages of smooth surface, beauty, wear resistance, pressurization, impact resistance and antibacterial property; the preparation is simple and easy to be operated, the construction is simple, and the application scope is wide.

A practical and environmentally-friendly method, i.e. the high temperature-mechanical mixing by using an internal mixing device and a two-roll open milling device is used to produce the carbon blacks-free electrically conductive sulfur-vulcanised rubber blends of solid poly(butadiene-co-acrylonitrile) and solid sulfonic acid doped polyaniline. The addition of sulfur vulcanisation system does not affect the electrical properties of the vulcanised blends. All vulcanised blends prepared by using this method show useful electrical conductivities up to the order of 10⁻² S/cm, good tensile strengths up to 18.0 MPa and colourable with the addition of a whitening agent. As a result, they have good potential to be used for manufacturing any antistatic products, electrostatic discharge or dissipative products and electromagnetic or radio frequency interferences shielding products.

The invention discloses a porous polyaniline-doped nano fiber material with a three-dimensional structure, and a preparation method and application of the porous polyaniline-doped nano fiber material. The preparation method of the fiber material comprises the following steps: (1) dissolving an aniline monomer into an inorganic protonic acid to obtain a solution A; (2) adding a surfactant into the solution A, and uniformly dispersing to obtain a solution B; (3) adding an oxidizing agent into the solution B, and performing polymerization reaction to obtain a latex solution C, wherein the weight ratio of a raw material namely the aniline monomer to the oxidizing agent is 1:(0.5-2); and (4) collecting a product in the latex solution C, washing, and drying to obtain the porous polyaniline-doped nano fiber material with the three-dimensional structure. The polyaniline-doped nano fiber material prepared by using the method disclosed by the invention is regular in morphology and uniform in hole, and has a relatively large specific surface area and high specific capacitance; and when the polyaniline-doped nano fiber material is applied to a super-capacitor, the super-capacitor has a relatively high specific capacitance value and good recycling life.

The invention discloses a condutcive polymer composite nanofiber resistive-type humidity sensor, which has a ceramic matrix. The surface of the ceramic matrix is provided with a plurality of pairs of crossed-finger gold electrodes through photoetching and evaporation; the crossed-finger gold electrodes are connected with leads; and the surfaces of the ceramic matrix and the crossed-finger gold electrodes are deposited with a humidity sensitive nanofiber film which is a complex prepared from polystyrolsulfon acid doped polyaniline, polyoxyethylene and polyvinyl butyral in a mass ratio of (10-40):(3-20):(20-50). An electrostatic spinning method is adopted for preparing the conductive polymer composite nanofiber resistive-type humidity sensor, and is simple and feasible. The conductive polymer composite nanofiber resistive-type humidity sensor has high response speed, small hysteresis and high sensitivity, and can be widely applied to detection and control of environment humidity in industrial and agricultural production, storage, weather and daily life.

The invention relates to a method for preparing an acid-doped conductive polyaniline material. The polymerization of aniline is triggered by an initiator under the aminosulfonic acid system and the aniline synthesizes the aminosulfonic acid-doped polyaniline. The aminosulfonic acid is an amphiphilic surfactant, the stability is very high, the volatilization is difficult, the prepared aminosulfonic acid-doped conductive polyaniline has good electrochemical property and chemical stability, and the resistance of the product can be controlled.