150 results about "Nanoparticle deposition" patented technology

A catalyst, useful for the direct epoxidation of olefins, is disclosed. The catalyst comprises palladium nanoparticles, support nanoparticles, and a titanium zeolite having a particle size of 2 microns or greater. The palladium nanoparticles are deposited on the support nanoparticles to form supported palladium nanoparticles, and the supported palladium nanoparticles are deposited on the titanium zeolite; or the supported palladium nanoparticles are deposited on a carrier having a particle size of 2 microns or greater. The invention also includes a process for producing an epoxide comprising reacting an olefin, hydrogen and oxygen in the presence of the catalyst. The catalysts are more active in epoxidation reactions, while demonstrating the same or better selectivity.

The present invention provides a nano-graphite alkenyl composite wave-absorbing material and method of preparing the same. The wave-absorbing material includes graphite alkenyl and nanoparticle deposition material which is metal or metallic oxide; the weight percentage of the graphite alkenyl is 15-95%, the weight percentage of the nanoparticle deposition material is 5-85%, the metal or metallic oxide nanoparticle is deposited on the graphite alkenyl surface and between the layers, prepared by the metal salt and graphite alkenyl in the electrodeposition pattern. The nano-graphite alkenyl composite wave-absorbing material is provided with stable capability, thin thickness, low density, corrosion resistant, simple manufacture, good wave-absorbing capability and favourable application foreground.

The invention provides a super-hydrophobic textile prepared from a modified polyester fiber based on dopamine and a preparation method thereof, the preparation method comprises the steps that a polyester fabric is soaked into different buffer solutions in sequence, nano-particles produced by dopamine polymerization are deposited on the fiber surface adhered with polydopamine, the fiber is finally treated by a low surface energy modifier to obtain the super-hydrophobic textile; the buffer solution at east comprises two kinds of different buffer solutions, namely, a phosphate buffer solution of the dopamine and a trihydroxymethyl aminomethane buffer solution of the dopamine. According to the super-hydrophobic textile prepared from the modified polyester fiber based on the dopamine and the preparation method thereof, the characteristic that the sizes of polydopamine nano particles produced by dopamine polymerization in different buffer solution systems is utilized, autoxidation polymerization of dopamine is utilized to be adhered to and deposited on the fiber surface to form a rough structure required by the super-hydrophobic surface, and the super-hydrophobic surface can be prepared after the rough structure is treated by the low surface energy; the reaction process is simple, the condition is mild; and the water drop contact angle of the super-hydrophobic surface prepared by the invention is more than 150 degree.

Methods for fabricating a photovoltaic device on complexly shaped fabricated objects, such as car bodies are disclosed. Preferably the photovoltaic device includes absorber layers comprising Copper, Indium, Gallium, Selenide (CIGS) or Copper, Zinc, Tin, Sulfide (CZTS). The method includes the following steps: a colloidal suspension of metal surface-charged nanoparticles is formed; electrophoretic deposition is used to deposit the nanopartieles in a metal thin film onto a complexly shaped surface of the substrate; the metal thin film is heated in the presence of a chalcogen source to convert the metal thin film into a metal chalcogenide thin film layer; a buffer layer is formed on the metal chalcogenide thin film layer using a chemical bath deposition; an intrinsic zinc oxide insulating layer is formed adjacent to a side of the buffer layer, opposite the metal chalcogenide thin film layer, by chemical vapor deposition; and finally, a transparent conducting oxide is formed adjacent to a side of the intrinsic zinc oxide, opposite the buffer layer, by chemical vapor deposition.

A method for modifying glassy surfaces including: producing nanoparticles; depositing the said nanoparticles on a surface; providing energy to the particles and/or surface so that the nanoparticles are at least partly diffused/dissolved into the glassy surface; and reducing the cohesive energy of the nanoparticles during the production of the nanoparticles or after the production of the nanoparticles.

A method includes: (a) conformally depositing a barrier coating, provided in liquid form, on at least one surface of a substrate; (b) embedding a plurality of nanoparticles in the barrier coating to a selected depth; and (c) fully curing the barrier coating after embedding the plurality of nanoparticles; the embedded plurality of nanoparticles are in continuous contact with the cured barrier coating. The order in which the barrier coating and nanoparticles are deposited on the substrate can be switched or they can be deposited simultaneously. An article includes a substrate having a cured barrier coating conformally disposed on at least one surface of the substrate and a plurality of nanoparticles embedded to a selected depth in the barrier coating creating an embedded portion of each of the plurality of nanoparticles. The embedded portion of each of the plurality of nanoparticles in continuous contact with the cured barrier coating.

A method for depositing nanoparticles in a thin film through the dispersion of such nanoparticles in a precursor solution which is deposited on a substrate and converted into a metal or metal oxide film. The resulting metal or metal oxide film will contain embedded nanoparticles. Such films can be used in a variety of applications such as diffusion barriers, electrodes for capacitors, conductors, resistors, inductors, dielectrics, or magnetic materials. The nanoparticle material may be selected by one skilled in the art based on the particular application.

The invention discloses preparation of a Cu2O/TNTs (TiO2 nanotubes) heterojunction nano composite material and a CO2 photoreduction method. The preparation comprises the following specific steps: preparing TNTs through an anodic oxidation method; in electrolyte of lactic acid containing copper sulfate, controlling electrochemical deposition parameters and performing electrodeposition to deposit Cu2O nanoparticles into the TNTs; and after the reaction is finished, cleaning, drying, and performing annealing treatment to obtain the Cu2O/TNTs heterojunction nano composite material. CO2 gas is converted into methanol through photoreduction by putting the composite material in distilled water and taking high-power pulse laser having a wavelength of 355nm as a light source, the maximum conversion efficiency is about 1.66%, and the maximum photon efficiency of the methanol conversion is about 6.63%. The invention is simple in required equipment, easy to operate, suitable for industrial production and convenient to perform recovery.

Functionalized nanoparticles are deposited on metal lines inlaid in dielectric to form a metal cap layer that reduces electromigration in the metal line. The functionalized nanoparticles are deposited onto activated metal surfaces, then sintered and annealed to remove the functional agents leaving behind a continuous capping layer. The resulting cap layer is about 1 to 10 nm thick with 30-100% atomic of the nanoparticle material. Various semiconductor processing tools may be adapted for this deposition process without adding footprint in the semiconductor fabrication plant.

The invention discloses a light irradiation preparation method and a use of an ultra-sensitive surface enhanced Raman scattering active base. The light irradiation preparation method comprises the following steps of: firstly, depositing silver nano particles on a surface of a DNA, then, taking the silver as a nucleation site to assemble the gold on the silver; and then, depositing small gold particles on a nano structure of silver-DNA by the sunlight again. The silver-nucleus gold-shell or silver-gold alloy nano DNA network structure is a good surface enhanced Raman scattering (SERS) active base obviously effective in TNT detection. The lowest detection limit can reach the prior lowest detection level, and enhancement factors can reach the order of magnitude of 1011-1012. The Light irradiation preparation method and the use of the ultra-sensitive surface enhanced Raman scattering active base provide a quick and accurate detection method for detecting explosives, such as TNT and the like.

The invention discloses a hydrogen peroxide non-enzyme electrochemical sensor for detecting H2O2 by utilizing the response of a chemical electrode under H2O2. A chemical electrode is a pair of electrodes embellished by noble metal nanometer particles, and the noble metals are gold, silver, platinum, palladium or iridium; the electrodes embellished by noble metal nanometer particles are the noble metal nanometer particles which are deposited on an electrode material through a beam depositing method, the deposit rate of the nanometer particles in the deposition of the nanometer particles is controlled to be more than 0.3 layer and less than 5 layers, and a glassy carbon electrode material or nano-graphite is adopted as an electrode material. The hydrogen peroxide non-enzyme electrochemical sensor provided by the invention has the advantages that the electrode embellished by the method enables the surface of the electrode to have the good dispersibility and crystallinity as well as the clean surface, a problem that a catalyst of the traditional method is easy to gather and fall is solved, using of a conductive binding agent is avoided, the effective catalyzing area and stability of the electrode are improved, and the delivery of an electron between the electrode and the catalyst is accelerated.

Functionalized nanoparticles are deposited on metal lines inlaid in dielectric to form a metal cap layer that reduces electromigration in the metal line. The functionalized nanoparticles are deposited onto activated metal surfaces, then sintered and annealed to remove the functional agents leaving behind a continuous capping layer. The resulting cap layer is about 1 to 10 nm thick with 30-100% atomic of the nanoparticle material. Various semiconductor processing tools may be adapted for this deposition process without adding footprint in the semiconductor fabrication plant.

The invention belongs to the field of industrial lubricant, concretely relates to a dry type lubricant without containing grease and its mother liquor. According to the invention, the mother liquor of the dry type lubricant without containing grease is prepared by 0.01 to 95 parts of nanoparticle and 5 to 99.99 parts of volatile solvent which is in a liquid state under the normal temperature. Theinvention also discloses a nanometer lubricating agent without containing grease, which consists of a nanoparticle deposition layer attached on a frictional pairs surface or a residual volatile hydrocarbon deposition layer existed in liquid state under the normal temperature. Nanoparticles are dispersed for dissolving in volatile hydrocarbon, nanoparticles can be stablely attached to the frictional secondary surface due to large surface energy when using, only nanoparticles with lubrication efficacy are left after volatilizing hydrocarbon, a dry type oil free film can be formed, thereby the lubricant has the effect of pollution resistance and high temperature resistance, and has good lubricity.

The invention provides a preparation method of an electrochemical aptamer sensor for detecting aflatoxin B1. The preparation method comprises the following steps of (1) dropwise adding mesoporous carbon onto a work electrode; (2) performing potentiostatic gold nanoparticle deposition for modifying CMK/GCE; (3) dropwise adding an AFB1 aptamer modified with sulfydryl at one end onto an AuNPs/CMK/GCEelectrode; (4) immersing the Apt/AuNPs/CMK/GCE into an MB (Methylene Blue) solution, so that the MB is adsorbed on an aptamer chain to obtain an MB-Apt/AuNPs/CMK/GCE electrode; and (5) detecting thereduction peak current value. The electrochemical aptamer sensor for detecting aflatoxin B1 can achieve the goal of quantitatively detecting a target object; the characteristics of high speed and operation simplicity are realized; and the defects of operation complexity and long detection period of a large-scale detecting instrument are overcome.

Deposition of nanoparticles onto carbon surfaces is described. Metal and/or metal oxide ions are deposited on a carbon surface by electrodeposition, such as by immersing a carbon and an anode in a salt bath, and applying a number of electrical pulses having a defined pulse width. The size, coverage density, and metallic composition of the nanoparticles may be affected by the pulse width of the electrical pulses, the number of electrical pulses, and the chemical composition of the salt bath, respectively. The carbon may be anodized before electrodeposition. If the carbon is a carbon precursor, after electrodeposition, the carbon precursor is carbonized to form a carbon. After electrodeposition, the carbon may be activated to form an activated carbon. The nanoparticles may serve as catalysts for activation rugosity of mesoporous carbons. The catalytically activated carbon materials may be used in all manner of devices that contain carbon materials.

This invention discloses a method for preparing a catalyst for catalyzing the degradation of organic pollutants in printing and dyeing wastewater by ozone, wherein the catalyst comprises a porous carbon material as a substrate and metal oxide nanoparticles deposited on the surface of the substrate. The method comprises the steps of: allowing a mixture of resorcinol, formaldehyde, trimethylhexadecyl ammonium bromide, multi-walled carbon nanotubes and deionized water to react to form cured product, which is then calcinated and carbonized at high temperature to produce the porous carbon material; impregnating the resulting porous carbon material with nitrate solution, drying the porous carbon material, and calcinating it at high temperature, wherein the absorbed nitrate is decomposed into metal oxide and embedded into the porous carbon material. Depending on the requirement of applications, the raw material for preparation of the catalyst of the present invention can be pulverized to screen out the appropriate particle size to fit into practical engineering applications. With the optimization of catalytic oxidation process, the catalyst can be used to promote the rapid degradation of organic matter in printing and dyeing wastewater by ozonation, and the percentage of degradation can be greatly improved. As a result, indicators of wastewater, including the chromaticity and COD, can be significantly reduced.

A device for sensing hydrogen based on palladium or palladium alloy nanoparticles, wherein the nanoparticles are deposited on a resistive substrate, to permit sensing of less than 1% hydrogen; wherein the nanoparticles are deposited as islands on a continuous resistive layer.

The invention discloses a PDMS-based bionic sharkskin replica super-hydrophobic surface and a preparation method thereof and belongs to the technical field of hydrophobic surface preparation. According to the PDMS-based bionic sharkskin replica super-hydrophobic surface and the preparation method thereof, a sharkskin replica is obtained through twice mold changing of PDMS with a sharkskin as a template, and the surface of the sharkskin replica has a micron-scale groove structure; the PDMS sharkskin replica is put above a flame of an alcohol lamp or a lighter to be subjected to uniform combustion treatment, so that nano-particles generated during combustion are deposited on the PDMS sharkskin replica to enable the surface structure to become a micro-nano structure, and finally, the PDMS sharkskin replica is subjected to heating treatment. According to the super-hydrophobic surface preparation method provided by the invention, the contact angle of liquid drops is greater than 150 degrees, the rolling angle of the liquid drops is less than 10 degrees, and the material shows the super-hydrophobic property. The PDMS-based bionic sharkskin replica super-hydrophobic surface is simple in process, low in cost and easy to control and has good application prospects in the fields such as fog and ice prevention, self-cleaning, resistance reduction and oil-water separation.

Methods are generally provided for forming a membrane. In one embodiment, the method includes: dispersing GO nanoparticles in a solvent; depositing the GO nanoparticles on a support to form a GO membrane; and reducing the GO membrane to form a rGO membrane. Also provided is the rGO membrane formed from such methods, along with a plurality of stacked rGO layers. Methods are also provided for separating water from a water/oil emulsion by, for example, passing water through the rGO membrane.