12 results about "Polypyrrole nanoparticles" patented technology

The invention discloses a manganese phenol network coated polyethyleneimine stabilized polypyrrole nanoparticle and application thereof, and belongs to the technical field of biological medicine. Hyperbranched polyethyleneimine is used as a carrier, polypyrrole and Mn < 2 + > are integrated in a functionalized PEI.NH2 nano system, PPy nanoparticles are stabilized through the functionalized PEI.NH2, then gold nanoparticles are wrapped in the functionalized PEI.NH2, and finally the nano composite system is wrapped with a tannic acid-manganese ion network through a one-step assembly method. The preparation method comprises the following steps: constructing a PEI.NH2 stable PPy nanoparticle Au-PPy PPSNs (at) TMn coated with a manganese phenol network; according to the Au-PPy PPSNs (at) TMn disclosed by the invention, CDT / PTT synergistic treatment and CT / MR (Computed Tomography / Magnetic Resonance) bimodal imaging of cancer cells can be realized.

The invention belongs to the technical field of polymer preparation, and particularly relates to a self-supporting polypyrrole nano array as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) dispersing an aqueous solution of hydroxypropyl-beta-cyclodextrin on an ice surface, then adding a pyrrole monomer, and standing to form a dispersion liquid; and (2) dropwise adding an acid solution containing an oxidizing agent into the dispersion liquid, reacting, washing and drying to obtain the self-supporting polypyrrole nano array. Compared with zero-dimensional polypyrrole nano-particles or polypyrrole nano-sheets, the array structure is a pre-constructed continuous conductive path. Moreover, the network structure of the polypyrrole nanosheet array with the self-supporting structure can interpenetrate with a resin matrix, uniformly transfer stress, inhibit crack propagation and easily form a continuous conductive path, high conductivity can be realized by a low addition amount, and the polypyrrole nanosheet array can be used as a conductive filler of polyurethane in the technical field of 3D printing; the mechanical property and the antistatic capability of the product are improved.

The application provides a membrane hole dynamic expansion nanofiltration membrane and a preparation method, use method and application thereof, the membrane hole dynamic expansion nanofiltration membrane comprises a porous polymer matrix membrane and an oxidized graphene-pyrrole nanoparticle composite membrane covering the surface of the porous polymer matrix membrane; the membrane hole dynamic expansion nanofiltration membrane is prepared by sequentially performing suction filtration and reduction reaction on the porous polymer matrix membrane with a mixed solution containing pyrrole nanoparticles and oxidized graphene; by selecting and adjusting the electrode potential applied to the membrane hole dynamic expansion nanofiltration membrane, the membrane hole dynamic expansion can be realized in an electrochemical control mode, and the desalination performance of the nanofiltration membrane can be adjusted in situ, so that the application in water treatment can be realized; the application has the advantages of simple preparation process, wide application potential and the like.

The application discloses PPy@CeO2 NPs nanoparticles and a preparation method and application thereof, CeO2 nanoparticles are loaded on the surface of polypyrrole nanoparticles, and the preparation method comprises the following steps: S1, polypyrrole nanoparticles are synthesized by using a chemical oxidation polymerization method; S2, Ce 3+ is oxidized into CeO2 nanoparticles in an alkaline environment provided by hexamethylenetetramine, is mixed with polypyrrole nanoparticles, is coated on the surface of the polypyrrole nanoparticles, and PPy@CeO2 NPs nanoparticles are obtained. The PPy@CeO2 NPs nanoparticles can be applied to preparation of photothermal conversion agents and CDT reagents.

The invention relates to the technical field of anticorrosive paint, in particular to a graphene / polymer composite anticorrosive coating and a preparation method thereof. The composite coating is formed by curing a composite coating consisting of polypyrrole nanoparticle-nanowire co-coated graphene composite powder, hydroxy acrylic resin, butyl acetate, a defoaming agent, a flatting agent and a curing agent, and graphene is uniformly coated with polypyrrole in two morphologies of nanoparticles and nanowires through in-situ polymerization and low-temperature reaction processes. Therefore, a three-dimensional conductive network is constructed on the coating, corrosion current is uniformly dispersed, local electrochemical corrosion is inhibited, and coating defects are reduced; meanwhile, a passivation film can be induced on the surface of a metal matrix through the oxidation-reduction characteristic of polypyrrole, and dynamic self-repairing is achieved. The coating has excellent adhesive force and long-acting corrosion resistance, is suitable for metal base materials such as Q235 low-carbon steel, and has a wide application prospect in harsh environments such as ocean and chemical engineering.

The invention relates to a conductive hydrogel patch and a preparation method and application thereof, the conductive hydrogel patch comprises an inner layer and an outer layer, the outer layer comprises modified gellan gum, and the inner layer comprises a cross-linked network, nanoparticles and a polymer; the cross-linked network is mainly composed of acrylic acid, methacrylic acid N-succinimide ester, alpha-ketoglutaric acid and chitosan, the nanoparticles comprise polypyrrole nanoparticles coated with dopamine, and the polymer comprises a dendritic polymer which is loaded with a fat-soluble drug and is modified by lauryl sodium sulfate. The preparation method comprises the following steps: preparing modified gellan gum; preparing a dendritic polymer loaded with a fat-soluble drug and modified by lauryl sodium sulfate; preparing the polypyrrole nano particles coated with the dopamine; preparing a cross-linked network; and preparing the conductive hydrogel patch. The conductive hydrogel patch is clear in structural layering, synergistic and efficient in function and capable of achieving multi-dimensional accurate intervention and functional repair of a focus area after myocardial infarction.

The application discloses a kind of high elastic toughness antibacterial nanocomposite conductive hydrogel material and its preparation method and biomimetic sensing application, belong to the field of functional polymer materials.The application uses melamine foam as porous elastic skeleton, is modified in situ on foam skeleton growth polypyrrole nanoparticles, subsequently polymerizes polydopamine-polyacrylamide hydrogel network in its inside, obtains the multifunctional nanocomposite conductive hydrogel with stable interpenetrating structure.The composite conductive hydrogel of the application has the synergistic effect formed by electronic conduction and ionic conduction, not only has excellent conductivity (up to 12 mS·cm ‑1 ), but also has high elastic toughness and reversible compression performance, has excellent pressure sensing performance under low pressure (0.3 kPa), so as to realize efficient information transmission and encryption application as a pressure sensor.

The invention discloses cerium-doped polypyrrole nanoparticles as well as a preparation method and application thereof, and relates to the technical field of medicines. The preparation method of the cerium-doped polypyrrole nanoparticles comprises the following steps: (1) preparing a mixed solution of polyvinyl alcohol and pyrrole, with the concentration of the polyvinyl alcohol being 0.05-5 g / mL and the concentration of the pyrrole being 5-20 [mu] L / mL; and (2) adding a Ce (SO4) 2 solution into the mixed solution of polyvinyl alcohol and pyrrole obtained in the step (1), and reacting under a stirring condition to obtain the cerium-doped polypyrrole nanoparticles. The CePPy nanoparticles synthesized by the invention have efficient and broad-spectrum free radical scavenging activity, including OH, O2 <-> and H2O2. In the nano-particles, unique positive surface charges of (+) CePPy are preferentially combined with negatively charged cell membranes, and efficient enrichment in damaged kidneys is realized. And active targeting and enrichment in mitochondria, which is a main place for generating ROS, are realized, so that the treatment efficiency is greatly improved, and the off-target effect is reduced.

The invention provides a preparation method of an early warning type flame-retardant wood composite material, and relates to the field of wood material flame-retardant modification. According to the preparation method, a wood material is taken as a matrix, a pre-warning layer is prepared by dipping in a polydopa-polypyrrole nanoparticle solution, and a flame-retardant coating is constructed by dipping in an MMT-PAAS mixed solution, so that the pre-warning-flame-retardant integrated composite material is obtained. The preparation method can be widely applied to various wood materials such as poplar, shaving boards and fiberboards. According to the method, the flame retardant property of the base material can be remarkably improved, the heat release rate, the total heat release amount and the toxic gas release amount during combustion are reduced, and the method also has the characteristics of sensitive resistance response of the early warning layer, no damage to the natural texture of the base material, greenness, environmental protection, simplicity and convenience in operation, low cost and the like, and has a prospect of large-scale industrial preparation and application.

The application discloses a kind of high elastic toughness antibacterial nanocomposite conductive hydrogel material and its preparation method and biomimetic sensing application, belong to the field of functional polymer materials.The application uses melamine foam as porous elastic skeleton, is modified in situ on foam skeleton growth polypyrrole nanoparticles, subsequently polymerizes polydopamine-polyacrylamide hydrogel network in its inside, obtains the multifunctional nanocomposite conductive hydrogel with stable interpenetrating structure.The composite conductive hydrogel of the application has the synergistic effect formed by electronic conduction and ionic conduction, not only has excellent conductivity (up to 12 mS·cm ‑1 ), but also has high elastic toughness and reversible compression performance, has excellent pressure sensing performance under low pressure (0.3 kPa), so as to realize efficient information transmission and encryption application as a pressure sensor.

The invention discloses an antifouling polylactic acid fiber fabric and a preparation method thereof, and relates to the technical field of textile materials. When the antifouling polylactic acid fiber fabric is prepared, firstly, polypyrrole nanoparticles react with KH590 to obtain modified polypyrrole nanoparticles; synthesizing methacrylamide guanidine hydrochloride, grafting methacrylamide guanidine hydrochloride with polylactic acid, and reacting methacrylamide guanidine hydrochloride with KH560 to prepare silanized antibacterial grafted polylactic acid; silanized antibacterial grafted polylactic acid, the modified polypyrrole nanoparticles and KH570 are subjected to blending electrostatic spinning and weaving, and a modified polylactic acid fiber fabric is obtained; the preparation method comprises the following steps: carrying out hydrolytic polycondensation on trifluoropropane trimethoxysilane serving as a precursor, and then reacting with dimethylchlorosilane to prepare fluorinated hydrogen-containing polysilsesquioxane; and treating a modified polylactic acid fiber fabric with a KH570 treating fluid, immersing the treated modified polylactic acid fiber fabric in a coating solution containing the fluorinated hydrogen-containing polysilsesquioxane, and performing heat treatment to obtain the antifouling polylactic acid fiber fabric. The fabric has excellent antifouling, antibacterial and antistatic properties.

This invention discloses a photothermal-triggered reusable drug delivery microneedle patch based on phase change materials, its preparation method, and its applications, relating to the field of pharmaceutical technology. The microneedle patch comprises several microneedles, each containing a drug-loaded matrix, a therapeutic drug, and photothermal nanoparticles. The drug-loaded matrix comprises a phase change material with reversible solidification-melting properties, capable of melting under photothermal triggering conditions and reverting to solidification after the photothermal triggering conditions disappear. The melting point of the phase change material is between 38°C and 45°C. The phase change material includes higher fatty acids and polyethylene glycol derivatives, and the photothermal nanoparticles include gold nanorods, graphene oxide, and polypyrrole nanoparticles. This invention proposes a microneedle patch using near-infrared light as a trigger signal and a phase change material with reversible solidification-melting properties. Through the melting process of the same phase change material under photothermal triggering, reusable drug delivery is achieved, overcoming the technical limitations of existing microneedles that only allow for "single-use, continuous drug release."