71results about How to "Thickness control" patented technology

The invention belongs to the technical field of inorganic functional materials, and discloses a method for preparing a graphene/Ag composite conductive film. The method provided by the invention is characterized in that a graphene oxide/Ag sol precursor is adopted; and the graphene/Ag composite conductive film which is transparent is obtained by a dip-coating method and heat treatment. The method provided by the invention has the advantages that the dip-coating method is adopted; the viscosity of the graphene oxide/Ag sol precursor is changed by control of a volume ratio of graphene oxide to Ag sol; control of film thickness, film transmittance and film conductivity is realized through control of frequency of dip-coating processes; the method provided by the invention has a simple flow and can be operated easily.

The invention discloses a method for preparing self-support layered materials MXenes and application of the self-support layered materials MXenes as Raman substrates. Ti3C2Tx which is prepared after Ti3AlC2 is etched by HF (hydrofluoric acid) is used as the SERS (surface enhanced Raman scattering) substrates, organic dye probe molecular solution with different degrees of concentration is coated onTi3C2Tx materials by the aid of dispensing processes, and then substrate materials with adsorbed probe molecules can be aired on glass slides to be used for Raman detection. The method and the application have the advantages that the Ti3C2Tx with a large specific surface area is excellent in adsorption performance for dye molecules, alkali metal ions and the like, and the quantities of hot spotscan be increased; the Ti3C2Tx substrates are good in homogeneity and high in stability and universality when used for detecting the dye molecules; the method for preparing the SERS substrates is simple and can have a broad application prospect in the field of food additives, pesticide residue detection and the like.

The invention relates to an automatic production line assembly for young silkworm feeding. The automatic production line assembly comprises an automatic leaf cutting machine, an automatic silkworm feeding system, an automatic silkworm plaque destacking and stacking machine, a control system and a power mechanism. The control system comprises an inductor and a single-chip microcomputer. The inductor is arranged on a stacking machine body, and the inductor and the power mechanism are connected with the single-chip microcomputer. Folium mori is cut through the automatic leaf cutting machine, then, the cut folium mori is conveyed into the automatic silkworm feeding system through a conveying-out belt, the folium mori falls into silkworm plaques conveyed out of a silkworm feeding machine silkworm plaque conveying belt for feeding after being evenly scraped in the automatic silkworm feeding system, and stacked silkworm plaques can be conveyed into the automatic silkworm feeding system one byone for silkworm feeding through the automatic silkworm plaque destacking and stacking machine. The automatic production line assembly achieves automatic silkworm feeding, accordingly, young silkwormfeeding automatic production is achieved, and the work efficiency is improved.

The invention belongs to the technical field of solar cells and specifically discloses a planar heterojunction perovskite solar cell and a preparation method thereof. The planar heterojunction perovskite solar cell comprises a transparent conductive electrode, an electron transmission layer, a perovskite luminous absorption layer, a cavity transmission layer and a method electrode in sequence from down to up. The electron transmission layer is a TiO2 compact layer. The perovskite luminous absorption layer is made of a chloride-ion-doped perovskite material. According to the invention, a TiO2 mesoporous layer in a conventional sensitized solar cell is rejected, and the device structure and the preparation technology are simplified; the chloride-ion-doped perovskite material is used as the luminous absorption material, the film forming ability of a film is improved, and the diffusion and separation of carriers are facilitated; aimed at the processing of the transparent conductive electrode and the TiO2 compact layer, an oxygen plasma processing technology is provided, and the film forming effect is improved; and aimed at the thickness control problem of the perovskite luminous absorption layer, a layer-by-layer spin coating technology is adopted, and the photoelectric performance of the luminous absorption layer and the integral cell is regulated and controlled.

The invention discloses a method for coating a high-nickel ternary positive electrode material by atomic layer deposition. The method mainly solves the problems that the performance of the lithium battery is reduced, the performance of the lithium battery can be improved through positive electrode material wrapping, and existing carbon material wrapping is poor in interface stability and falls offafter being used for a period of time. An existing method for wrapping an oxide with a positive electrode material is complex in process and high in cost, and has the problem that waste liquid needsto be treated subsequently. The preparation method is characterized by comprising the following steps: heating, depressurizing, introducing a precursor A, introducing gas to clean a reaction chamber,introducing a precursor B, introducing gas to clean the reaction chamber, and repeating the reaction steps to obtain a coating layer with a certain thickness. The method has the advantages that the coating layer is uniform, the generated coating layer is a metal oxide and is relatively stable, the cycle stability and the capacity stability of the battery are improved, no waste liquid is generatedin the production process, the method is environment-friendly, the cost for waste liquid treatment is reduced, and the thickness of the coating layer is changed by controlling the cycle number.

The invention discloses a method for reducing the nucleation density of graphene wafers. The method includes the following steps that firstly, polishing and oxidizing pretreatment is performed on a copper foil surface, and then the graphene wafers are prepared on the treated copper foil surface. The new method for reducing the nucleation density of the graphene wafers is put forward, and the method is simple, convenient, easy to implement and good in effect. Meanwhile, the influences of the roughness and the oxidizing degree of a copper base on the nucleation density of the graphene wafers canbe explored, so that the size of the graphene wafers can be increased further, and the quality of thin graphene films can be improved.

The invention discloses a preparation method of a stackable large-area nano wire intersected lattice array resistive switching memory device structure. The preparation method comprises that a resin colloid material transfer method is used to realize alternative stacking and intersected distribution of a silicon nano wire array and a film material, and a film interlayer silicon nano wire intersected lattice array structure of the 3D space is formed; and in the alternative stacking process, the top silicon nano wire serves as a mask, an etching device is used to etch the film material not shielded by nano wires in the grid part, an extremely low point contact structure of a nano wire intersection point and interlayer film material is obtained, and a vertical conductive channel of extremely high alignment is provided for the memory device. According to the method, it is not required to introduce the high-cost micronano control technology (as a nano mechanical arm), only a simple transfertechnology is used to realize directed stacking of the nano material, the silicon nano wire serves as the master to realize accurate etching of the film material, and the electronic device of the nano-level sandwich type point-to-point contact structure is prepared reliably.

The invention discloses a honeycomb metal-organic framework nanosheet and a preparation method thereof. The honeycomb metal-organic framework nanosheet is prepared by self-assembling a metal ion Cu<2+> and an organic ligand, namely 1,4-terephthalic acid through a coordinate bond. The honeycomb metal-organic framework nanosheet has the advantages of high specific surface area, more surface active sites, high mechanical stability and the like, has a wide application prospect in fields of chemocatalysis, drug sustained release, hydrogen energy reserving, biomedicine and the like, and is simple insynthetic process and low in cost.

The invention discloses a preparation method of a platinum layer thickness-controllable rhodium-platinum core-shell bimetallic nano branch. The preparation method comprises the following steps that PVP is used as a surfactant, rhodium chloride is used as metal precursor salt, n-octyl amine serves as a reaction solvent and a reducing agent, high-temperature and high-pressure reaction is carried outin a polytetrafluoroethylene reaction kettle, a pure rhodium nano branch is prepared, then, the pure rhodium nano branch is repeatedly cleaned by using ethanol to remove surface organic matter, thenthe pure rhodium nano branch is dissolved in ethylene glycol, and then a platinum precursor salt solution is injected to deposit a platinum layer on the surface of the pure rhodium branch, thereby obtaining the Rh@Pt core-shell structure bimetallic nano branch. According to the preparation method, by changing the injection amount of the platinum precursor salt, the thickness of the platinum layeris regulated and controlled, the prepared product has an ultrafine core-shell nano-branch structure, and when the prepared product is applied to catalytic aspects such as alcohol electro-catalytic oxidation and hydrogen evolution reaction, the good catalytic performance can be exhibited.

The invention discloses a nano-material transfer deposition method. The method comprises the following steps: a nano-material is mixed with a solution to form a suspension, and the mixed suspension is heated for realizing the carrying of the nano-material by evaporated solution molecules, so the nano-material adheres to the surface a substrate placed above the liquid surface of the mixed suspension to form a film obtained through stacking the nano-material layer upon layer. The nano-material film having different thickness can be prepared through controlling the deposition time, the concentration of the nano-material in the suspension, the distance between the substrate and a sample and the heating temperature.

The invention discloses a SnO2 composite carbon nanotube electric heating film and a preparation method thereof. The electric heating film is a tetragonal rutile structure and comprises a carbon nanotube and SnO2 with a mass ratio of 0.0002 to 0.002 : 1; A manufacture method comprises adde tin salt and modifier into a solvent to prepare a mixed solution, SnO2 composite carbon nanotube electrothermal film was prepared by adding modified carbon nanotube and stirring evenly to obtain electrothermal film precursor solution, spraying the electrothermal film precursor solution onto the coated substrate, and then annealing the coated substrate at 470 - 570 DEG C for 10 - 20 min to obtain SnO2 composite carbon nanotube electrothermal film. The electric heating film of the invention has small resistance, high emissivity, excellent thermal efficiency and strong chemical stability, and can replace the existing heating element with poor thermal efficiency and heat resistance, and is energy-savingand environmentally friendly. At that same time, the manufacture method is simple, energy-saving and environment-friendly, and can be industrialized.

The invention discloses an ordered extralarge-hole-pitch alumina film and a preparation method thereof. The alumina film has high hardness and elastic modulus, low reflectivity and obvious photoluminescence performance. The surface of the film is composed of innumerable holes. The bottoms of the holes are distributed in ordered hexagons. According to the ordered extralarge-hole-pitch alumina film and the preparation method thereof, macromolecular organic acid serves as an electrolyte, the electrolyte and an aluminum base are effectively cooled simultaneously, and the aluminum base is stably oxidized under extra-high voltage. The alumina film can serve as an ideal template for preparing various ordered major-cycle nano array structures of metal, polymer and the like, and can also be used for developing three-dimensional channel alumina films of micro and nano composite structures. The major-cycle alumina film is an excellent bioactivator carrier and has wide application prospects in the aspects of biosensors, medicine transport platforms, solar cells and the like.

The invention relates to a method for preparing Al/Ni reaction laminated foil by EBPVD (electron beam physical vapor deposition), and aims to solve the technical problems that a current Al/Ni laminated foil preparation method is low in production efficiency and high in production cost, impurities are easily led into an Al/Ni layer interface, pollution is caused, and higher self-propagating speed cannot be obtained. The method includes the steps: firstly, previous preparation of EBPVD; secondly, ingot preheating; thirdly, deposition layer separation; fourthly, laminated foil deposition. The Al/Ni reaction laminated foil is uniform in structure, the layer thickness can be controlled, the interface is complete and clear, pollution is avoided, production efficiency is high, cost is low, the temperature of various substrates can be lower than 160 DEG C in the preparation process, combustion of the Al/Ni reaction laminated foil is avoided, and the Al/Ni reaction laminated foil prepared by the method can release great heat in a self-propagating mode within a short time and can be applied to the field of special welding.

The invention discloses a carbon nanotube foam material with electromagnetic shielding performance, and a preparation method and application thereof. The preparation method of the carbon nanotube foammaterial with the electromagnetic shielding performance comprises the following steps: placing carbon nanotube foam into a reaction chamber of chemical vapor deposition equipment; and heating the reaction chamber to 1000-1100 DEG C, and then at least introducing a carbon source and a reducing gas into the reaction chamber, so as to carry out secondary deposition of amorphous carbon on the carbonnanotube foam, thereby obtaining the carbon nanotube foam material with the electromagnetic shielding performance, wherein the carbon nanotube foam material comprises a porous structure composed of a3D network structure with self-supporting capability. According to the invention, the prepared carbon nanotube foam material with the electromagnetic shielding performance has excellent shielding effectiveness, controllable density and thickness, small mass, good flexibility and excellent shielding effectiveness stability; and the preparation process is simple, and batch production can be expanded.

The invention discloses a preparation method and application of a nickel hydroxide/nickel electrode. An ultrathin nickel hydroxide (alpha-Ni(OH)2) nanosheet with the thickness of 3.0 nm is directly grown on foamed nickel (NF) through electro-deposition, and an alpha-Ni(OH)2/NF self-supporting electrode is constructed. The electrode shows excellent OER catalytic performance, the current density of 10 mA*cm<-2> and the current density of 100 mA*cm<-2> can be driven only by low overpotentials of 192 mV and 240 mV in 1.0 M KOH electrolyte solution, and the catalytic performance exceeds that of nickel hydroxide/oxide and reference RuO2 in the prior art. In addition, the alpha-Ni(OH)2/NF self-supporting electrode can drive a large current density of 500-1000 mA*cm<-2> only with a low overpotential, and has a potential industrial application value.

The invention discloses a preparation method for a polyurethane nano zinc oxide super-hydrophobic coating. The method comprises the following preparation steps: grinding a base material, cleaning andpre-treating the base material, adopting a mechanical-ultrasonic vibrating way to prepare a polyurethane mixed solution; coating a certain thickness of the polyurethane mixed solution on the surface of a base body, enabling the mixed solution to separate out and cure into a film under a high-moisture environment, cleaning and drying the film, putting the film into an alcohol solution with low-surface-energy substances to modify, and drying the film to the polyurethane nano zinc oxide super-hydrophobic coating with super-hydrophobicity. The preparation method is simple in preparation conditionand operation requirement; the prepared coating has controllable thickness, and uniform and compact surface micro-nano structure distribution; and a coating contact angle can be 160 degrees after thelow-surface-energy substances are modified.

The invention discloses bean curd sheet preparation equipment and aims to provide thin bean curd sheet processing equipment which is consistent in product size, uniform in thickness and high in yield. The bean curd sheet preparation equipment comprises a net-shaped conveyor belt (13) arranged on a rack (1) through a roller shaft (7), wherein the conveyor belt is driven by a motor (4) fixed on the rack (1) through a transmission mechanism; the motor (4) is fixed on the rack (1); the transmission mechanism consists of a small chain wheel fixed on a shaft of the motor, a big chain wheel (6) fixed on the roller shaft (7), and a chain (5) connecting the small chain wheel with the big chain wheel (6); a bottom-layer filter cloth roller (15), a surface-layer filter cloth roller (18) and a slurry slot (16) are arranged above the conveyor belt (13); the slurry slot is positioned between the bottom-layer filter cloth roller (15) and the surface-layer filter cloth roller (18). The bean curd sheet preparation equipment is simple in structure, convenient to operate, and capable of replacing manual operation to realize continuous production, and is bean curd processing equipment.

The invention discloses an enhanced self-lubricating joint bearing gasket material preparation method, which comprises: coating inorganic nano-powder with a borate polymer, and under the synergistic effect of organic-metal coordination and B-N coordination, simply and efficiently preparing a core-shell structure nano-powder with an adjustable shell thickness. According to the present invention, byusing the strong affinity between the borate polymer and the matrix resin and the hydrogen-bond interaction between the surplus boric acid or catechol functional group on the surface and the matrix resin, the dispersity of the nanoparticles in the matrix resin is improved, and the comprehensive mechanical properties of the coating material are improved.

The invention discloses steam humidification based ginned cotton humidifying equipment for cotton production and processing. The equipment comprises a conveying frame, a feeding port, conveying rollers, a humidifying mechanism and a humidifying pipeline, wherein the feeding port is formed in the upper portion of the left end of the conveying frame; the interiors of the left end and the right end of the conveying frame are connected with the conveying rollers through bearings; the rear end of the conveying roller in the right end of the conveying frame penetrates through the rear side face of the conveying frame; a mounting shaft rod is connected to the interior of the right end of the conveying frame by a bearing; a conveying belt is arranged on the outer side of the conveying roller; and a first vertical rod and a second vertical rod are connected to the interior of the upper surface of the conveying frame by bearings. The steam humidification based ginned cotton humidifying equipment for cotton production and processing is provided with a moving plate and a blocking rod; the moving plate and the blocking rod form a comb structure; and the conveying thickness of cotton can be regulated and controlled through the setting of the distance between the moving plate and the conveying belt and the distance between the blocking rod and the conveying belt, so that the thickness of the cotton is conveniently regulated and controlled and the influence on later humidification work due to relatively thick cotton accumulation is avoided.