11 results about "Zno nanoparticles" patented technology

A method for improving the germination of *Carex lumbricoides* seeds based on nano-zinc oxide initiation belongs to the field of wetland ecological engineering technology. The invention includes the following steps: First, nano-zinc oxide particles with a particle size of 30±10 nm are dispersed in deionized water by ultrasonic oscillation to prepare a suspension of 12.5-200 mg / L; second, collected *Carex lumbricoides* seeds are float-screened, and plump seeds that sink to the bottom are selected and subjected to surface sterilization; subsequently, the sterilized seeds are immersed in the nano-zinc oxide suspension and initiated by agitation under light-proof conditions for 6 or 24 hours, followed by air drying to restore the initial moisture content; finally, the initiated seeds are placed in an artificial climate incubator for germination culture under specific variable temperature and light conditions. This invention utilizes the biocompatibility of nano-zinc oxide and effectively solves the problems of long germination cycles and low germination rates of *Carex lumbricoides* seeds by precisely controlling the initiation concentration and time. This invention has the advantages of simple operation, low cost, and environmental friendliness, and can significantly improve the germination rate and germination percentage, providing high-quality seedlings for the restoration of degraded wetland vegetation.

The present application provides the use of a nanocomposite with a core-shell structure. Specifically, the present application provides the use of a nanocomposite with a core-shell structure in the preparation of a drug for preventing and / or treating Clostridium difficile infection and recurrent diseases caused thereby, wherein the nanocomposite comprises: ZnO nanoparticles as a core; mesoporous silica as a shell coated on the surface of the ZnO nanoparticles; an antibiotic loaded in the pore channel of the mesoporous silica; hyperbranched polylysine modified on the surface of the mesoporous silica; and a pH-responsive coating material as the outermost layer. The nanocomposite provided by the present application can achieve precise targeted release of the drug in the colon, and through the sequential and synergistic mechanism of "membrane breaking-sterilization-spore inhibition-repair", it can simultaneously solve multiple factors leading to CDI recurrence such as biofilm protection, spore storage, bacterial population destruction, mucosal damage, etc., and improve the treatment effect.

The application belongs to the technical field of semiconductor gas sensitive material and sensor, and particularly relates to a selective gas sensitive material for a complex gas environment and a preparation method and application thereof. The gas sensitive material takes WO3 nanofiber as a substrate, composites ZnO nanoparticles on the surface of the substrate, and loads noble metal Ir to form an Ir-ZnO / WO3 ternary composite structure. The composite structure is obtained by adding WO3 nanofiber prepared by an electrospinning method, ZIF-8 precursor and Ir nanoparticles into an anhydrous ethanol solution, and then performing ultrasonic treatment and drying, and finally calcining under an air atmosphere. The material and the sensor exhibit high sensitivity and high selectivity to BTXs, and have good anti-interference ability and stability, and are suitable for real-time monitoring and early warning of BTXs leakage in a complex industrial site with multiple gas interference such as petrochemical industry and waste treatment.

This invention provides a nanocomposite material with a core-shell structure. The nanocomposite material comprises: ZnO nanoparticles as the core; mesoporous silica as the shell coating the surface of the ZnO nanoparticles; an antibiotic loaded within the pores of the mesoporous silica; hyperbranched polylysine modified on the surface of the mesoporous silica; and a pH-responsive coating material as the outermost layer. The nanocomposite material provided by this invention enables precise targeted drug release in the colon, simultaneously addressing multiple factors leading to CDI recurrence, such as biofilm protection, spore storage, microbial disruption, and mucosal damage, through a sequential synergistic mechanism of "membrane disruption-bactericidal-spore inhibition-repair," thereby improving treatment efficacy.

The application discloses a preparation method and application of a GO-rGO / ZnO / GelMA bio-ink material. The rGO reduced by a physical method of ultraviolet irradiation is compounded with GelMA hydrogel, and ZnO nanoparticles are introduced at the same time. The rGO and the ZnO nanoparticles synergistically act, on the one hand, improve the printing performance of the GelMA hydrogel, and on the other hand, reduce the swelling rate and degradation rate of the GelMA hydrogel support, and improve the compression modulus, biological activity, osteogenic property and antibacterial performance of the GelMA hydrogel support. Therefore, the GO-rGO / ZnO / GelMA composite bio-ink material prepared by the application has the printing performance, biological activity, osteogenic property and antibacterial property, can realize integrated and synergistic repair of osteogenesis and anti-infection, and can be widely applied to the preparation of bone repair materials. Meanwhile, the ZnO-rGO composite system can be applied to interior wall coating as an effective antibacterial agent.

The application discloses a zinc oxide / molybdenum disulfide nanocomposite and a preparation method and application thereof. The zinc oxide / molybdenum disulfide nanocomposite is prepared by taking bulk molybdenum disulfide and zinc acetate as raw materials, peeling off few-layer molybdenum disulfide nanosheets from the bulk molybdenum disulfide by using an ultrasonic cell pulverizer, and depositing ZnO nanoparticles on the molybdenum disulfide nanosheets in situ by using a coprecipitation method. The composite material has regular morphology, and the sizes of the two base materials are matched. The specific steps of the preparation method include that the method has low cost, simple equipment and low operation difficulty, and can be used for industrial large-scale production. The obtained zinc oxide / molybdenum disulfide nanocomposite has excellent abilities in antibiosis, biofilm removal, anti-inflammation and blood vessel formation, and can be applied to the fields of biomedical materials and the like.

The application belongs to the field of medical devices, and particularly relates to a medical catheter coating. The medical catheter coating comprises the following components in total amount parts: modified Cu-ZnO nanoparticles 10-15 parts; water-based PUA resin 25-35 parts; active diluent 10-25 parts; surfactant 1-1.5 parts; photoinitiator 1-2 parts; auxiliary agent 0.5-1 part; deionized water 10-20 parts; methanol and / or ethanol 40-60 parts. The coating provided by the application has good hydrophilicity, can reduce the friction between the catheter and human tissues, and has high antibacterial property.

This invention discloses an antibacterial and mosquito-repellent composite material based on plant extracts, its preparation method, and a latex paint. The method includes: providing a zinc ion solution and an alkaline precipitant solution, wherein the alkaline precipitant solution is selected from at least one of sodium hydroxide solution, potassium hydroxide solution, or ammonia water; mixing and reacting the zinc ion solution and the alkaline precipitant solution, controlling the final pH value of the reaction to be 8-11, and then post-processing to obtain nano-zinc oxide particles; dispersing the nano-zinc oxide particles in an L-cysteine ​​solution, adding a stabilizer to obtain an L-cysteine-modified nano-zinc oxide dispersion; adding β-alanine and plant extracts to the nano-zinc oxide dispersion, homogenizing and drying to obtain the antibacterial and mosquito-repellent composite material; wherein the plant extract is selected from at least one of thymol or geraniol, nocaketone, physalisol, citronella oil, and lemon eucalyptus oil, combined with thymol. This invention can produce an antibacterial and mosquito-repellent composite material with long-lasting antibacterial and mosquito-repellent effects.

This invention discloses a nanoparticle-reinforced nylon-based engineering plastic and its preparation method, belonging to the field of polymer engineering composite materials technology. The engineering plastic uses PA6 as a matrix, porous hollow ZnO nanoparticles prepared by PS template method as reinforcing fillers, supplemented with antioxidants, lubricants, and silane coupling agents, and is prepared through solvothermal reaction, calcination, acid activation, surface modification, and melt blending extrusion. This invention uses a PS microsphere template-assisted solvothermal-calcination process to prepare ZnO nanoparticles with internal cavities and abundant through-pores on the surface. After activation with dilute acetic acid and modification with KH-550, the problem of nanofiller agglomeration is effectively solved, achieving mechanical interlocking with the nylon matrix. The preparation process of this invention is controllable, and the resulting composite material, compared with pure PA6, exhibits significantly improved tensile strength and surface hardness, no significant decrease in elongation at break, and significantly optimized wear resistance. It possesses excellent overall performance and is suitable for high-end equipment structural components under high load and high friction conditions, showing promising prospects for industrial application.

This application belongs to the field of cable material technology and proposes a method for preparing environmentally friendly, low-smoke, halogen-free polyethylene cable material. High-density polyethylene is melt-grafted with vinyltrimethoxysilane and triethyl borate to form a cross-linked network containing Si-O-B bonds. During combustion, this network pyrolyzes to generate B2O3 and SiO2 nanoparticles. The former melts to form a liquid layer that adsorbs free radicals to inhibit the combustion chain reaction, while the latter forms a eutectic glass phase with B2O3. Combined with ZnO nanoparticles released from the decomposition of a borosilicate-metal chelating agent as a flux, a dense glass-ceramic layer is formed in the carbon layer to isolate oxygen and heat. Simultaneously, ethylene-vinyl acetate copolymer, as a vinyl elastomer, not only improves flexibility through its toughening phase, but its vinyl groups also interact with the Si-O-B bonds of the borosilicate-grafted polyethylene, achieving a comprehensive improvement in flame retardancy, smoke suppression, and mechanical properties.

This invention discloses a waste oil and wastewater purification material and its preparation method, belonging to the field of inorganic nanocomposite catalytic material preparation technology. The invention first prepares a ZnO nanoparticle dispersion and an acid-catalyzed SiO2 sol, using PEG-600 as a dispersant. The two are mixed and rapidly gelled with ammonia to obtain a SiO2@ZnO composite gel. After drying and calcination at 500-600℃, the surface is modified with a silane coupling agent to obtain the purification material. During calcination, the three-dimensional SiO2 network prevents ZnO nanoparticle aggregation and grain growth, while PEG-600 pyrolysis forms a porous structure, increasing the material's specific surface area. This purification material exhibits high photocatalytic activity and good stability, and can efficiently degrade liquid paraffin simulating oily wastewater under ultraviolet light. This invention solves the problems of easy sintering and aggregation of ZnO nanoparticles and poor dispersibility. The preparation process is simple and suitable for the photocatalytic purification of waste oil and wastewater.