217 results about "Zno nanoparticle" patented technology

The present invention relates to the formation of surface treated zinc oxide and titania particles, and in particular zinc oxide and titania nanoparticles, with a siloxane star-graft copolymer coating, comprising a looped and / or linear polymeric structure on a star-graft copolymer coating, on a particle surface to control the interfacial surface interactions between the particle and the oil phase of the cosmetic skin formulation.

The invention discloses a ZIF-8 film-coated Pd / ZnO core-shell catalyst, belonging to the field of novel materials. A Pd / ZnO core uses spherical ZnO as a supporter; the particle size of the spherical ZnO supporter is 300nm-500nm; the spherical ZnO supporter is formed by accumulation of ZnO nanoparticles with the particle size of 20nm-40nm. A stable Pd nanoparticle of PVP (Polyvinyl Pyrrolidone) is taken as an active center, and the thickness of a ZIF-8 film coating the Pd / ZnO core is 100nm-150nm. The spherical ZnO supporter and the stable Pd nanoparticle of PVP are mixed and a 2-methylimidazole solution is added to act with ZnO so as to obtain the ZIF-8 film layer on the outer surface of Pd / ZnO. According to the ZIF-8 film-coated Pd / ZnO core-shell catalyst, the ZIF-8 film with a molecular screening function endows the supported noble metal catalyst with high selectivity to reactants and products; meanwhile, the problem of activity reduction caused by the fact that the active ingredients of heterogeneous catalysts are likely to run away and be poisoned in reaction are solved.

An antibacterial elastic nano-class polyurethane composition is prepared through mixing antibacterial agent, SiO2 or ZnO nanoparticles or laminated nano material, and polyether polyol, vacuumizing, dewatering, degassing, adding assistants to obtain nano material B, preparing polyurethane prepolymer as B, proportional mixing A with B, adding catalyst, stirring and solidifying. Its advantages are outstanding antibacterial performance and high mechanical performance.

Provided are low-temperature formation methods of a perfectly oriented ZnO nanorod array and a new-type ZnO nanowall array having a new crystal growth rate, morphology, and orientation, from ZnO nanoparticles coated on a substrate. The method of forming the ZnO nanorod array includes synthesizing ZnO nanoparticles, coating on a substrate the ZnO nanoparticles serving both as a buffer layer and a seed layer, and growing the ZnO nanoparticles into crystals in a nutrient solution containing Zn nitrate, Zn acetate, or a derivative thereof, and hexamethylenetetramine. The method of forming the ZnO nanowall array includes synthesizing ZnO nanoparticles, coating on a substrate the ZnO nanoparticles serving both as a buffer layer and a seed layer, and growing the ZnO nanoparticles into crystals in a nutrient solution containing Zn acetate or its derivative and sodium citrate.

PU / ZnO nanocomposites are provided wherein the addition of less than 1 vol % 33 nm ZnO nanoparticles into a PU matrix effect a decrease in the Young's Modulus and storage modulus of the polymer, while simultaneously effecting an increase glass transition temperature of the polymer. Detailed experiments are described (e.g., FTIR, DMTA, FESEM and AFM) that suggest that the reaction between hydroxyl groups of the ZnO nanoparticles and isocyanate groups of the polyurethane prepolymer disrupts the self-assembly of the phase separation in PU. Phase separation is responsible for the good mechanical properties of PU. Further, detailed experiments suggest that the increase of the glass transition temperature results from the crosslinking effect of the ZnO nanoparticles.

The invention discloses a corundum refractory castable. The raw materials used include a main material and an added organic dispersant. The main material is composed of corundum particles and fine powder, nano zinc oxide, aluminum oxide powder, and a binder. The weight percent of the raw materials is: 80-95wt% of corundum particles and fine powder, 3-15wt% of alumina micropowder, 1-5wt% of binder, 0.2-5wt% of nano-zinc oxide, and the added organic dispersant is the weight of the main material. 0.05-0.3 wt%. The present invention utilizes the characteristics of fine particle size of nano-zinc oxide powder, high activity at high temperature, moderate price and the like to improve the structure of the corundum castable, increase the medium-temperature strength, and prepare a corundum castable with excellent comprehensive performance and moderate price.

The invention discloses a quadrangular leaf-shaped Cu2O-ZnO composite nano-structural semiconductor material, comprising a silicon wafer substrate and a quadrangular leaf-shaped Cu2O-ZnO composite nano-structure grown on the silicon wafer substrate, wherein the Cu2O-ZnO composite nano-structure is composed of Cu2O microparticles and ZnO nanoparticles; the Cu2O microparticles have a quadrangular leaf-shaped structure; and the ZnO nanoparticles covers the surface of the Cu2O microparticles. The invention also discloses a preparation method for the quadrangular leaf-shaped Cu2O-ZnO composite nano-structural semiconductor material. The preparation method is simple in operations, and efficiency of light energy utilization of the obtained Cu2O-ZnO hetero nanostructure is significantly increased.

The invention discloses a preparation method of a graphene-ZnO nanoparticle composite material. The preparation method comprises the following steps: step 1): dissolving raw materials, namely graphene oxide and zinc salt, in water according to a certain mass ratio and uniformly mixing; step 2): separating the graphene oxide from the well mixed liquid, obtained in the step 1, by centrifugation or suction filtration and washing with water or alcohol; and step 3) performing heat treatment on the product, obtained in the step 2, in air or oxygen to get the graphene-ZnO nanoparticle composite material, wherein the zinc salt is one of zinc fluoride, zinc chloride, zinc bromide, zinc sulfate, zinc nitrate, zinc acetate and zinc phosphate, the heat treatment temperature is 150-1000 DEG C, and the heat treatment time is 5s-10h. The preparation method disclosed by the invention is simple, green and environment-friendly, and can effectively reduce the use of chemical reagents.

A flexible piezoelectric nanofiber membrane and a preparation method and application thereof are mainly related to the field of piezoelectricity. The preparation method of the flexible piezoelectric nanofiber membrane dopes ZnO nanoparticle-modified PVDF (polyvinylidene fluoride) fiber to the PVDF fiber by means of electrostatic spinning, so that the piezoelectric performance of the final flexiblepiezoelectric nanofiber membrane is improved; the preparation method is novel and simple and low in manufacture cost and is easy to popularize and apply. Therefore, the flexible piezoelectric nanofiber membrane and the preparation method thereof have the advantages that the preparation process is simple, the cost is low, large-scale preparation is easy to implement, the prepared flexible piezoelectric nanofiber membrane has good piezoelectric performance, a piezoelectric device (application of the flexible piezoelectric nanofiber membrane) has better electrical performance output, and accordingly, the flexible piezoelectric nanofiber membrane and the preparation method and application thereof have great popularization and application value and have a promising application prospect.

A composite nano-class antibacterial dressing for medical purpose is composed of an antibacterial layer and a supporting layer. Said antibacterial layer consists of the non-woven cloth or carbon fibre adsorption material and the ZnO nanoparticles containing positive Ag ions. Its advantages are broad spectrum, strong bactericiding power, and long service life.

Disclosed is an organic light-emitting diodes including a ZnO nanoparticle and an ionic group. The organic light-emitting diodes according to the present invention includes:a substrate formed of glass or a flexible plastic material;an anode formed on the substrate;a hole transport layer formed on the anode;an emissive layer formed on the hole transport layer;an electron transport layer being formed on the emissive layer and including a ZnO nanoparticle;an electron injection layer being formed on the electron transport layer and including an ionic group; anda cathode formed on the electron injection layer.

The invention relates to a nanoparticle composite high-temperature guar gum fracturing fluid which comprises a base liquid and a crosslinking agent, wherein the mass ratio of the base liquid to the crosslinking agent is 100:(0.3-0.6); the base liquid comprises the following components in percentage by mass: 0.3-0.6% of a thickening agent, 0.02-0.06% of water-soluble nanoparticles, 0.3-0.5% of a clay stabilizing agent, 0.3-0.5% of a surfactant, 0.1-0.3% of a temperature stabilizing agent and the balance of water; the crosslinking agent is a triethanolamine boron complex; the thickening agent isany one of hydroxypropyl guar gum and carboxymethyl hydroxypropyl guar gum; the water-soluble nanoparticles are SiO2 or ZnO granules of which the particle sizes are 1-10 nm after surface modification; a surface modification method of the water-soluble nanoparticles comprises the following steps: putting 5-15 g of 3-aminopropyl triethoxysilane into 50 ml of an ethanol solution, further adding 4-8g of SiO2 or ZnO nanoparticles, enabling the components to react for 40 minutes, adding 0.01-0.03 g of lauryl sodium sulfate and 4-7 g of an acrylic monomer, and carrying out initialization with 0.01-0.03 g of ammonium persulfate. Due to adoption of the nanoparticles, the network structure of the fracturing fluid can be improved, the temperature resistance and the shearing resistance of the fracturing fluid can be improved, and wide market application prospects can be achieved.