2614 results about "Polypyrrole" patented technology

A heart valve sewing prosthesis including an intrinsically conductive polymer. The invention includes annuloplasty rings and bands, and sewing rings or cuffs for prosthetic heart valves. Some annuloplasty rings and sewing rings include fabric that is coated with an intrinsically conductive polymer. The coating can be formed over individual filaments or fibers, or on the fabric surface as a surface layer. One intrinsically conductive polymer is polypyrrole. The intrinsically conductive polymer can be doped to facilitate the intrinsic conductivity. Some devices have a polypyrrole surface layer doped with dialkyl-napthalene sulfonate. The intrinsically conductive polymer can be deposited on a fabric using in-situ polymerization of monomeric or oligomeric species, together with a dopant. Animal studies using implanted annuloplasty rings having an intrinsically conductive polymer coating have demonstrated a substantial reduction in pannus formation and inflammatory response.

A medical device delivery sheath, which comprises an active member that volumetrically expands and contracts upon application of an appropriate electrical potential. The active member further comprises an electroactive polymer, for example, polypyrrole. Also described is a medical device delivery system comprising the same, as well as a method of delivering a medical device using the same.

Compositions and methods of making the compositions comprises at least one polymer selected from polypyrrole, polythiophene, or mixtures and at least one colloid-forming polymeric acid and at least one organic liquid. New compositions are useful in electrically conductive and semiconductive layers in electronic devices among other applications. Also provided is a method of making such compositions.

The present invention provides conductive carbon nanotube (CNT) electrode materials comprising aligned CNT substrates coated with an electrically conducting polymer, and the fabrication of electrodes for use in high performance electrical energy storage devices. In particular, the present invention provides conductive CNTs electrode material whose electrical properties render them especially suitable for use in high efficiency rechargeable batteries. The present invention also provides methods for obtaining surface modified conductive CNT electrode materials comprising an array of individual linear, aligned CNTs having a uniform surface coating of an electrically conductive polymer such as polypyrrole, and their use in electrical energy storage devices.

Remarkably, disclosed herein is a solvent-less chemical vapor deposition (CVD) method for the oxidative polymerization and deposition of thin films of electrically-conducting polymers. In a preferred embodiment, the method provides poly-3,4-ethylenedioxythiophene (PEDOT) thin films. In other embodiments, the method is applicable to polymerization to give other conducting polymers, such as polyanilines, polypyrroles, polythiophenes and their derivatives. The all-vapor technique uses a moderate substrate temperature, making it compatible with a range of materials, including as fabric and paper. In addition, this method allows for the coating of high surface-area substrates with fibrous, porous and/or particulate morphologies. The coated substrates may be used in organic semiconductor devices, including organic light-emitting diodes (OLEDs), photovoltaics, electrochromics, and supercapacitors.

An electrode composite material is disclosed in the invention. The electrode composite material comprises AB_xC_yD_z, wherein A is selected from at least one of polypyrrole, polyacrylonitrile, and polyacrylonitrile copolymer; B comprises sulfur; C is selected from carbon material; D is selected from metal oxides, l≦x≦20, 0≦y<l, and 0≦z<1. Comparing to the prior art, the conductivity of the electrode composite material is obviously increased, the material is dispersed uniformly and the size of the material is small. The electrochemical performance of the electrode composite material is improved. It has a good cycle life and high discharging capacity efficiency. A method for manufacturing the electrode composite material, a positive electrode using the electrode composite material and a battery including the same are also disclosed in the invention.

Electrically conducting polymer compositions are provided. The compositions comprise homopolymers and copolymers of polythiophene, polypyrrole, polyaniline, and polycyclic heteroaromatics, and combinations of those, in admixture with an organic solvent wettable fluorinated acid polymer. The acid polymers are fluorinated or highly fluorinated and have acidic groups including carboxylic acid groups, sulfonic acid groups, sulfonimide groups, phosphoric acid groups, phosphonic acid groups, and combinations thereof. The compositions may be used in organic electronic devices (OLEDs).

The present invention provides a molecular level of DNA information code which uses a base pair sequence as an information code unit. Also, the present invention provides a molecular code system which includes designing and coding DNA which is an information code unit; stabilizing the DNA information code by encapsulating it with an inorganic capsule and coating the DNA-inorganic capsule to a medium; taking and extracting the coated DNA information code which is present in a trace amount, collecting the DNA information code using a polypyrrole-maghemite nanohybrid; and amplifying the collected DNA information code using a polymerase chain reaction and reading the amplified DNA information code. According to the present invention, the DNA information code having high security is prepared by assigning a security unit to a DNA which has an excellent accumulating capacity, and then the DNA information code is stabilized so as to be coated to a medium. Only the DNA information code may be extracted, collected, and read, if necessary. Thus, a unified molecular code system can be established.

The invention relates to a non-platinum catalyst, in particular to an oxygen reduction catalyst for a proton exchange membrane fuel cell and preparation and application thereof. The catalyst can be prepared by the following steps of: (1) synthesizing polypyrrole (PPy); and (2) preparing an M/N-C catalyst, wherein the M/N-C catalyst can be taken as a cathode oxygen reduction catalyst for the proton exchange membrane fuel cell.

The invention discloses a polypyrrole/graphene nano composite which belongs to the technical field of composites. In the invention, ethanol is taken as a medium, para-toluenesulfonic acid is taken as a surface active agent, polyethylene glycol-400 is taken as phase transfer catalyst, FeCl3*6H2O is taken as an evocating agent, and under ultrasound conditions, pyrrole monomers are polymerized in situ on graphene, so as to obtain the polypyrrole/graphene nano composite. In the composite of the invention, through analysis by electron microscopy, the pyrrole monomers are polymerized in situ and evenly cover the grapheme, and the graphene and the polypyrrole are tightly combined in a nano level; and thermogravimetric analysis and electric conductivity study show that the composite has better heat stability, electric conductivity and processability and can be used in the fields of sensors, electron devices and biomedicine.

The invention relates to a preparation method of a foamed porous graphene/polypyrrole composite oil absorption material, belonging to the technical fields of environmental protection and composite materials. The method is characterized by comprising the following steps: carrying out KH570 functionalization on graphite oxide prepared from graphite; carrying out ultrasonic treatment on the functionalized graphite oxide product to obtain a graphene oxide aqueous solution with a certain concentration, adding certain amounts of pyrrole, styrene or butyl methacrylate or lauryl methacrylate and an initiator (ammonium persulfate or potassium persulfate); carrying out thermostatic reaction in a hydrothermal reaction kettle for 10 hours, thereby obtaining a black solid; and carrying out freeze-drying on the black solid to obtain the foamed porous graphene/polypyrrole composite oil absorption material in a three-dimensional structure. The graphene/polypyrrole composite oil absorption material ina three-dimensional structure is prepared by a chemical process, so the material has hydrophobicity and large specific area of the graphene, can contain abundant oil molecules, and has high oil adsorbability. The preparation method is simple to operate, and has the advantage of mild reaction conditions.

The invention belongs to the technical field of lithium sulfur batteries, specifically relates to a sulfur-carbon composite material with a nitrogen-doped porous carbon nanofiber net-shaped structure, as well as a preparation method and an application of the composite material. By taking a polypyrrole net-shaped structure which is synthesized by virtue of a soft template method as a raw material, taking the potassium hydroxide as a pore forming agent, and taking the nitrogen-doped carbon nanofiber net-shaped structure which is synthesized through high-temperature carbonization under nitrogen atmosphere and is in a porous structure as a precursor, the sulphur-carbon composite material which can be used as the anode of the lithium sulfur battery can be prepared through heat treatment with elemental sulfur. The preparation method provided by the invention is simple, and good in reproducibility, and the prepared composite material is uniform in structure distribution, and can be used as the anode of the lithium sulfur battery. Due to the nitrogen doping and the tridimensional net-shaped structure, for the material, the conductivity can be improved, a transmission path of lithium ions is shortened, meanwhile, the dissolving of the sulfur and intermediate product in an electrolyte can be prevented, the electrochemistry performance of a positive material of the lithium sulfur battery is improved, good specific discharge capacity, cycle performance and rate performance can be achieved.

The invention aims to provide a fabric coating finishing agent with electromagnetic shielding function and a preparation method thereof. The method comprises the following steps: preparing fabric supported by nano ferroferric oxide particles by an in-situ chemical method; synthesizing nano ferroferric oxide/polypyrrole composite material by an emulsification and oxidation method; and adding matrix resin, auxiliaries, film forming auxiliary and the like to synthesize the fabric coating finishing agent with electromagnetic shielding function. The fabric coating finishing agent has relatively high electric conductivity and magnetic conductivity, relatively high electromagnetic shielding absorption performance and relatively wide shielding frequency band; by coating the fabric coating finishing agent on fabric, a relatively good electromagnetic wave shielding and hiding effect is realized, and pollution of electromagnetic wave radiation is reduced as well; the fabric coating finishing agent has good handfeel smoothness, good anti-wrinkle performance and good antistatic, anti-corrosion and weather resistant effect, and is an environment-friendly product; and moreover, the process is simple and convenient, the production cost is relatively low, and the product performance is excellent.

An electrochemical cell having a fluid consuming electrode and a fluid regulating system for controlling the rate of entry of fluids into the cell. The fluid regulating system may include a valve for controlling the rate of entry of fluids into the cell and an actuator for operating the valve. The actuator comprises an ionic polymer that responds to changes in a potential applied across the actuator to open or close the valve. In one embodiment, the actuator comprises at least one conducting polymer. In one embodiment, the actuator comprises polypyrrole, at least one polypyrrole derivative, or mixtures of two of more thereof.

The invention relates to a super-hydrophobic washable conductive fabric and a preparation method thereof. The conductive fabric comprises a substrate fabric and a conductive polymer layer coated on the surface of the substrate fabric; the conductive polymer layer is polyaniline, polypyrrole, poly(3,4-ethylenedioxythiophene), polythiophene or their derivative polymer; and the substrate fabric is a blend fabric with the surface having cracks and the cross section having a cross shape, wherein the blend fabric is obtained by blending a heterotypic polyester synthetic fiber and a cotton fiber. The preparation method comprises the following steps: processing the substrate fabric with plasma, compositing the conductive polymer with the substrate fabric through utilizing an in situ polymerization method, and adjusting the molar ratio of a fluorine-containing doping agent and a polyaniline monomer and other reaction conditions to obtain conductive fabrics with different conductivities. The prepared conductive fabric which has the characteristics of high conductivity, rapid pH responsiveness, reversible super-hydrophobic performance, excellent washability and the like can be widely applied to development of wettability switching of acidity control, automatically cleaning fabrics, acidity detection and the like, so there are enormous business opportunities.

An electrically addressable release pad for use in a burst electrode drug release (delivery) system. The pad useable in this system comprises a polymer, preferably polypyrrole, which surrounds medicine. Once a section of the polymer receives an electrochemical potential sent from an electrode contained within the pad, a defined dose of medicine contained therein is released. The pad is designed to be worn by a patient, so that when the medication is released, its administered to the patient, without the patient having to do anything. The electrode typically can be a burst electrode, one with a unique electrical signature. The electrode can be triggered from a remote source.

The invention relates to a carbon-carried multi-metal polypyrrole oxygen reduction catalyst and a preparation method thereof. The metal Co or Fe in the present carbon-carried single-metal polypyrrole oxygen reduction catalyst Co-PPy/C or Fe-PPy/C is locally substituted by one or more other metal, thereby obtaining the carbon-carried multi-metal polypyrrole oxygen reduction catalyst containing two or more metals, wherein the total weight of the metals is 0.01-30% of the weight of the catalyst, the weight of each metal is 1-99% of the total weight of the metals in the catalyst, and the weight ratio of carbon to polypyrrole in the catalyst is (1000:1)-(1:1). Compared with the prior art, the carbon-carried multi-metal polypyrrole oxygen reduction catalyst has the advantages of good catalytic effect and the like.

The invention discloses a method for preparing a polypyrrole coated bacterial cellulose nanometer electric-conduction composite material by utilizing bacterial cellulose as a template; impurity removal is carried out on protogenetic dynamically-fermented bacterial cellulose nanometer fiber, so as to obtain moist bacterial cellulose after pretreatment; the moist bacterial cellulose is arranged in deionized water for uniform dispersion; dimethylformamide and pyrrole monomers are added and stirred to enable the pyrrole monomer to be fully dispersed into a bacterial cellulose network; and a mixed solution of oxidant and doping agent is added for carrying out in-situ oxidation polymerization, and an obtained crude product is washed by acetone (ethanol), deionized water and hydrochloric acid solution sequentially and repeatedly, and then is frozen and dried, so as to obtain a finished product. The nanometer electric-conduction composite material obtained by the invention has higher electric conduction efficiency, lower cost, mild reaction and low toxicity.