69results about How to "Uniform surface topography" patented technology

A particle filter for microelectromechanical systems is provided that includes a particle trap formed on a substrate material. The particle trap includes an array of multidimensional geometric structures in an adjacent relationship. The geometric structures further define a plurality of multidimensional voids therebetween for trapping particles therein. The individual multidimensional geometric structures are formed by a plurality of vertically interconnected geometric shapes to define different configurations of voids between the adjacent geometric structures. In one embodiment of the filter system, an electrical bias is applied to the array of multidimensional geometric structures to facilitate attracting and trapping of particles in the filter.

The invention relates to an optical sensor for fast detecting polycyclic aromatic hydrocarbon type contaminants. A TiO2 nanometer tube array with CdTe quantum dots decorated on the surface and inside the TiO2 nanometer tube array is used as the optical sensor for detecting the polycyclic aromatic hydrocarbon type contaminants, and the dimension of the CdTe quantum dots is between 5 and 25 nm. When the composite material is used as a sensing element, the detection on the polycyclic aromatic hydrocarbon type persistent organic contaminants can be realized. Through the method of the invention, the inventor successfully expands the application of the fluorescence performance of the CdTe quantum dots to a range lower than 450 nm for the first time. The sensing element has the advantages of simple manufacture step, low cost, stable physical and chemical property and portability, so the sensing element can be used as the optical sensor for fast, efficiently and quantitatively detecting the polycyclic aromatic hydrocarbon type contaminants in the environment.

The invention belongs to the field of new material preparation, in particular to a preparation method of ceramic membranes with different surface roughness. The preparation method of the invention comprises the following steps: using de-ionized water and polymer particles for preparing suspension liquid; carrying out ultra audible sound treatment on the suspension liquid in an ultrasonic instrument for uniformly dispersing the polymer particles; then, using an organic membrane as a filter membrane; carrying out suction filtration on the suspension liquid so that a layer of polymer particles is uniformly deposited on the surface of the organic membrane; then, placing the organic membrane on the bottom of a mold; adding ceramic powder bodies containing bonding agents into the mold; using a pelleting press for pressing the powder bodies into blanks at certain pressure; and finally, placing the pressed blanks into a furnace to be sintered at a high temperature to obtain the ceramic membrane with certain surface roughness. The method of the invention is simple, and the size of the polymer particles can be fast regulated for fast prepare the ceramic membrane with different surface roughness and uniform surface shape and appearance. The method is also applicable to the preparation of other inorganic materials with different surface roughness.

The invention relates to an extruder mouth-type plate and an extruder adopting the same. The extruder mouth-type plate comprises a mouth-type seat fixed to an extruder head, a supporting beam born by the mouth-type seat, and two or more relatively movable adjusting blocks connected to the supporting beam, wherein the mouth-type seat, the supporting beam and the adjusting blocks form an extrusion hole. Compared with the prior art, the problems of difficult complicated design and processing and high manufacturing cost of an extruder head of a conventional extruder are solved, the design of the mouth-type plate which is easy to design, simple to process and convenient to modify is adopted, the adjustable extrusion hole is formed by the mouth-type seat, the supporting beam and the adjusting blocks, a plurality of different runners and the outlet-shaped mouth-type plate can be configured through the extruder head of a set of extruder for extrusion molding of products with different raw materials, different flow parameter requirements and different product shapes and sizes, the extruder is multifunctional, the design and processing costs of the extruder are reduced, and the equipment purchasing costs of manufacturers are reduced.

The invention provides a method for acquiring a vitrification-silane compound modification layer on a surface of a steel body and a modification liquid. The preparation method is carried out according to the following steps that firstly, silane coupling agent pre-hydrolysate subjected to acid environment prehydrolysis treatment is added into the vitrification modification liquid, then, under the room temperature condition, a pre-treated steel base body is immersed for 0.5-1 h in the vitrification liquid, and the compound modification layer containing copper, iron, manganese, zirconium and zinc can be acquired on the surface of the steel. According to the preparation method, the chemical conversion coating technology is adopted, the method is suitable for large complex curved parts, and moreover, use of heavy metal ions, such as Cr<6+> with relatively high toxicity is avoided in the modification liquid; and the method does not have the defect that a phosphate conversion coating technology pollutes water seriously. The modification layer acquired through the method is uniform in appearance and excellent in decay resistance.

A formation method of a semiconductor device comprises the steps of providing a substrate, wherein the substrate possesses a first area, a sacrificial layer is arranged on the surface of the substrate, and a semiconductor layer is arranged on the surface of the sacrificial layer; forming at least three adjacent first grooves in the semiconductor layer and the sacrificial layer of the first area, wherein the first grooves expose out of the surface of the substrate, the semiconductor layer between the first grooves forms at least two parallelly arranged nano wires, the distances between the adjacent nano wires are same, and the nano wires comprise the device nano wires and the pseudo nano wires; removing the sacrificial layer at the bottoms of the nano wires to enable the nano wires to suspend above the substrate; after the sacrificial layer of the first area is removed, carrying out a first time annealing process to enable the cross-sections of the nano wires to be circular; after the first time annealing process, removing the pseudo nano wires. The morphology and performance of the formed semiconductor device are improved.

The invention provides immunomagnetic beads and a preparation method thereof. The preparation method comprises the following steps: swelling polystyrene microspheres; synthesizing magnetic composite microspheres at high temperature and high pressure; carrying out acid dissolution to remove exposed magnetic particles on the surfaces of the magnetic composite microspheres; and carrying out surface cross-linking modification on the magnetic composite microspheres. The immunomagnetic beads prepared by the method disclosed by the invention are uniform in particle size, good in magnetic responsiveness, stable in structure and consistent in magnetic content.

The invention relates to a photoelectrochemical etching method for removing an epitaxial graphene buffer layer on a SiC substrate, comprising the following steps: (1) connecting a SiC substrate epitaxial graphene wafer to metal indium as a working electrode; using a saturated calomel electrode or The silver/silver chloride electrode is used as the reference electrode, the platinum electrode is used as the counter electrode, and the KOH solution is used as the etching solution; the working electrode, the reference electrode and the counter electrode are placed in the etching solution, and a three-electrode system is assembled; (2 ) Irradiate the three-electrode system with ultraviolet light, and control the electrolytic current density to 1.0-2.0mA/cm ² , the buffer layer can be removed by photoelectrochemical etching on the SiC substrate epitaxial graphene buffer wafer. By optimizing the process parameters in the method of the invention, the buffer layer can be completely removed, and a graphene material with a uniform surface can be obtained.

The invention relates to an ion exchange polymer microsphere and a synthesis method thereof. The microsphere has a micron size, is internally composed of a hydrophobic polymer, and has a solid and compact structure; and the outer part is composed of a charged hydrophilic polymer and has a nano-porous structure. By changing the types of the hydrophobic polymer and the charged hydrophilic polymer, the chemical components and the surface appearance of the microspheres can be regulated and controlled. The microspheres have uniform size and morphology, the preparation method is simple, large-scale production is easy, and the microspheres have wide industrial application value. The ion exchange polymer microsphere with the micro-nano hierarchical heterostructure has great value in adsorption and separation of various molecules, ions and particles, and is expected to be applied to the fields of medicine purification, food detection, environmental governance and the like.

The invention provides a preparation method of a single pure-phase bismuth ferrite material based on ionic compensation, which belongs to the field of ceramic material preparation. Firstly, a bismuth ferrite ceramic reaction mixture is prepared and then is dried for presintering for the first time; then 0.3 to 0.7wt percent of bismuth oxide is added through secondary ball milling for ionic compensation, and drying is performed for presintering for the second time; 0.2 to 0.4wt percent of bismuth oxide is added through third ball milling for ionic compensation, drying is performed for presintering for 0.5 to 1.5 h at 810 to 835 DEG C, and natural cooling is performed to room temperature along with a furnace, so as to obtain the single pure-phase bismuth ferrite material. According to the preparation method, the bismuth oxide and ferric oxide are used as raw materials, and three-step sintering and twice ionic compensation are adopted to prepare the single pure-phase bismuth ferrite material, so as to solve the technical problem of composition segregation caused by volatile bismuth oxide in the preparation process of bismuth ferrite and prepare the single pure-phase bismuth ferrite material.

The invention provides design of a non-uniform curved surface fly-eye lens and a preparation method of the same. The method comprises the steps of: setting sub-eyes, with different calibers and vectorheights, of all levels on the curved surface fly-eye lens, and acquiring different sub-eye focal lengths of all levels; enabling light to enter from the plane end of the curved surface fly-eye lens and exit from the curved surface end, wherein light at different angles passes through the optical center of the sub-eye, so that all light refraction focuses fall on the same plane; and taking the central sub-eye through which light enters in a manner of being perpendicular to the plane end of the curved surface fly-eye lens as a primary sub-eye. The non-uniform curved surface fly-eye lens is prepared by utilizing twice air pressure assistance and an ultraviolet curing process, the time is short, the efficiency is high, the repeatability is good, and the surface appearance is uniform.

The surface of a device that is surgically implantable in living bone is prepared. The device is made of titanium with a native oxide layer on the surface. The method of preparation comprises the steps of removing the native oxide layer from the surface of the device and performing further treatment of the surface substantially in the absence of unreacted oxygen.

The invention relates to a GQD (graphene quantum dot) sensitized mesoporous Ti coated type GQD@TiO2/CG (conductive glass) visible light catalytic electrode and a preparation technology thereof. A core-shell liquid crystal synthesized with an in situ polymerization technology is adopted as a template to prepare the visible light catalytic GQD@TiO2/CG electrode through spray deposition, Soxhlet extraction and low-temperature heat treatment. The method has the outstanding characteristics as follows: the GQD sensitized mesoporous Ti coated type GQD@TiO2/CG with a novel structure and visible light catalytic capacity is prepared with a spray coating technology and a core-shell liquid crystal template method, and a new approach is provided for application research of porous material supported mesoporous doped TiO2 photocatalytic materials. The process is simple, industrial production is easy, and the prepared efficient gas diffusion photoelectrode mesoporous material supported composite nanomaterial has high electrical conductivity, large specific surface area and uniform pore size distribution.

The invention belongs to the technical field of nano materials, and particularly relates to a nickel-cobalt hydroxide composite material, and a preparation method thereof and a supercapacitor. The preparation method of the nickel-cobalt hydroxide composite material comprises the following steps: providing a first nickel material and a second nickel material, wherein the first nickel material is foamed nickel; preparing an electrolyte containing cobalt salt, nickel salt and a precipitator; and placing the first nickel material and the second nickel material in the electrolyte, wherein the first nickel material serves as a cathode, the second nickel material serves as an anode, electro-deposition treatment is carried out under the microwave hydrothermal condition, and the nickel-cobalt hydroxide composite material grows on the surface of the first nickel material. The preparation method is accurate and stable in reaction condition, and the prepared nickel-cobalt hydroxide composite material is uniform in surface appearance and rich in structure and has good specific capacitance and cycle performance when being used as an electrode material, so that the nickel-cobalt hydroxide composite material has good application prospects in supercapacitors.

The invention relates to an anti-corrosion silicon core pipe, which comprises an inner layer and an outer layer. The outer surface of the outer layer and the inner surface of the inner layer are provided with anti-corrosion protective layers respectively. Each anti-corrosion protective layer comprises 74.5-80wt% of high density polyethylene, 7-15wt% of activated carbon fibers, 6-15wt% of antibacterial microcapsules and 2-3.5wt% of a dispersing agent. The silicon core pipe is provided with the anti-corrosion protective layers which are provided with the antibacterial microcapsules with garlic essential oil or mustard essential oil serving as a core material. The garlic essential oil or mustard essential oil has great antibacterial effects and is capable of effectively inhibiting growth of microorganisms such as mildew to protect the silicon core pipe; further, the garlic essential oil or mustard essential oil has certain irritation, so that probability that small animals bite the pipe can be lowered; in addition, the anti-corrosion protective layers are further provided with magnesium sulfate solution loaded activated carbon fibers with great moisture absorption performance, so thatsurroundings of the silicon core pipe can be kept dry, a growth environment of the microorganisms such as mildew is destroyed, growth of the microorganisms such as mildew is reduced, and the siliconcore pipe is protected from being corroded by the microorganisms.

The invention provides an Nd-graphene composite material and a preparation method and application thereof. The preparation method of the composite material comprises the following steps that S1, graphene is grown on the surface of a foamed nickel substrate by using a chemical vapor deposition method to obtain a graphene foamed nickel material; and S2, an Nd elementary substance is prepared on the graphene surface of the graphene foamed nickel material to obtain the Nd-graphene composite material. According to the preparation method, the foamed nickel is adopted as the substrate, the foamed nickel is a conductive 3D porous material which is low in cost and good in performance, the foamed nickel can play a role in a framework when being used as the substrate, graphene stacking can be avoided through the foamed nickel, and graphene can be fully spread; and meanwhile, neodymium in neodymium fluoride is a rare earth element, and due to the unique property of neodymium 4f electrons, the neodymium fluoride is combined with an electrocatalyst, so that the electrochemical catalysis efficiency of hydrogen evolution reaction, oxygen evolution reaction, oxygen reduction reaction and the like is remarkably improved. The material prepared by the invention has a self-supporting structure, and no binder is needed in use.

The invention discloses a preparation method of a degradable orthopedic implant material capable of dual self-healing and controllable drug release. According to the material, hyaluronic acid and polyethyleneimine intrinsic self-healing polymer coatings are assembled on the surface of magnesium alloy layer by layer, mesoporous silica nanoparticles serve as a carrier nano platform of the coating composite stimulation-responsive drug-loaded nanocapsule, a small molecule corrosion inhibitor paeonol can be embedded, and the outermost layer is coated with polydopamine macromolecules. The orthopedic implant material has good functions of self-healing, corrosion protection, drug controlled release and the like at the same time. A coating on the surface of the magnesium alloy implant material is uniform, compact and high in binding force. The drug-loading nanocapsule is high in drug loading capacity, and drug release kinetics can be regulated and controlled.

The invention provides a preparation method of a FeOOH/PVDF (Polyvinylidene Fluoride) fiber scaffold. The preparation method of the FeOOH/PVDF fiber scaffold comprises the following steps of dissolving PVDF powder in a mixed solvent of acetone and N, N-dimethylformamide to prepare a PVDF solution, then carrying out electrostatic spinning to obtain a fiber membrane, and then drying to obtain a PVDF fiber membrane; and transferring a mixed solution of ferric chloride hexahydrate and sodium nitrate and the PVDF fiber membrane into a reaction kettle for hydrothermal reaction, and washing and drying a product to obtain the FeOOH/PVDF fiber scaffold. The FeOOH in the FeOOH/PVDF fiber scaffold obtained by the preparation method is rod-shaped, the length is about 800 to 900 nm, the width is about 100 nm, and the crystal form is beta form; and the FeOOH is loaded on the surface of the PVDF fiber. The FeOOH/PVDF fiber scaffold can be used as a medical material for inducing mesenchymal stem cells to differentiate into nerve cells. According to the FeOOH/PVDF fiber scaffold as well as the preparation method and the application thereof provided by the invention, the FeOOH/PVDF fiber membrane is designed and prepared by utilizing an electrostatic spinning technology and a hydrothermal reaction process, the preparation method is simple, and reaction conditions are easy to realize; and the obtained scaffold is uniform in surface appearance, has good piezoelectricity, and can induce rBMSCs neural differentiation in a wireless stimulation mode.

The invention belongs to the technical field of medical material preparation, and provides a preparation method of a degradable piezoelectric fiber stent and a product thereof. The preparation method of the degradable piezoelectric fiber stent comprises the following steps: preparing a gelatin solution, performing electrostatic spinning to prepare a fiber membrane, and drying to obtain a gelatin fiber membrane; placing the gelatin fiber membrane in glutaraldehyde saturated steam for normal-temperature crosslinking, and drying to obtain the degradable piezoelectric fiber stent. The preparation method provided by the invention adopts electrostatic spinning and chemical crosslinking modes for preparation, the method is simple, and reaction conditions are easy to realize. The prepared degradable piezoelectric fiber membrane stent can induce neural differentiation of neural stem cells in a wireless stimulation mode, and has important significance in clinical and nervous tissue engineering.