48results about How to "The experimental process is simple" patented technology

The invention discloses a preparation method of a silica shear thickening liquid. The preparation method comprises the following steps of: preparing monodisperse silica microspheres with certain grain size in an alcohol-water mixed liquid according to a multi-level seed growth method by utilizing tetraethoxysilane serves as a raw material and ammonia as a catalyst; after reaction is finished, adding shear thickening liquid dispersion media (polyethylene glycol, glycerol and the like) into a SiO2 suspension liquid; after mixing uniformly, removing ethanol, water and ammonia from the mixed liquid by adopting a heating and pressure-reducing method to finally prepare the silica shear thickening liquid, wherein the ethanol which is collected under reduced pressure can serve as a solvent and can be reused. In the preparation method, the SiO2 microspheres exist in the form of a uniformly dispersed suspension liquid from the synthesis link to the preparation link of the shear thickening liquid, so the agglomeration phenomenon of powder in drying and redispersion processes is avoided, and the stability and rheological property of the shear thickening liquid are improved.

The invention belongs to the technical field of collagen extraction and particularly relates to a method for preparing collagen from deer sinew by using the processes of extraction and purification through hydrochloric acid hydrolysis and trypsin enzymolysis. The method comprises the following steps: removing fat, skin and sinew membrane from the deer sinew; cutting the deer sinew into small pieces with the size being 0.5cm<3> to 1cm<3>; then, repeatedly washing the cut deer sinew with normal saline to remove sera and fat; further rinsing the washed deer sinew with distilled water; adding hydrochloric acid with the volume concentration thereof being 0.05% to 1.0% to the rinsed deer sinew by the solid-liquid ratio being 1g:5ml to 1g:15ml, and soaking the deer sinew in the hydrochloric acid for 12h to 60h; then, feeding the deer sinew in boiling water (100 DEG C) until the deer sinew is completely dissolved; centrifuging; neutralizing the supernatant with alkaline solution; adding trypsin for conducting the enzymolysis process with the ratio between the trypsin and the zymolyte being 1g:5,000g to 1g:50,000g; concentrating the supernatant and filtering with a 0.2mum-0.45mum filter membrane; and freeze-drying the filtrate in a vacuum to obtain the collagen powder. The method of the invention has the advantages of simple and easy-to-operate process and stable experimental result. Therefore, the method is suitable for large-scale industrialized production.

The invention provides a method for etching SiC through a metal/oxide double-layer mask structure, and the method at least comprises the steps: 1), providing an SiC epitaxial wafer, and growing an oxide mask layer on the surface of the SiC epitaxial wafer; 2), forming a photoresist layer on the surface of the oxide mask layer of a to-be-etched region of the SiC epitaxial wafer; 3), forming metal mask layers on the oxide mask layer and the surface of the photoresist layer; 4), removing the photoresist layer and the metal mask layer on the surface of the photoresist layer, and forming an etching window; 5), etching the oxide mask layer and the SiC epitaxial wafer to a needed depth through the etching window; 6), removing the residual metal mask layer and oxide mask layer, and obtaining an SiC gate groove structure. According to the invention, the oxide mask layer is taken as a blocking layer, thereby preventing the metal elements from diffusing towards the SiC epitaxial wafer and the substrate, and solving a problem of element pollution. In addition, the method can obtain a high-etching-rate gate and high-anisotropism groove structure with the smooth etching surface.

The invention provides a wet chemical method for preparing a nanometer multilayer structured nickel hydroxide hollow tube, which is mainly characterized in that the method takes inorganic salt containing nickel as a nickel source, and glycol as a complexing agent to obtain the nanometer multilayer structured Alpha-Ni(OH)2 hollow tube in one step through thermal reaction of the solvent; during the preparation process, neither templates nor surface active agents are needed; the Alpha-Ni(OH)2 hollow tube which is 0.3Mum to 2.5Mum in diameter and the outer wall of which is composed of a large quantity of soft and 20nm to 50nm thick Alpha-Ni(OH)2 nano-plates can be obtained through the thermal reaction of the solvent at the temperature of 150 to 190 DEG C for 3 to 8 hours. The preparation method adopts the environment-friendly glycol as the complexing agent to prepare the Alpha-Ni(OH)2 hollow tube that has a large specific surface and a hollow internal structure and is expected to be widely applied in such fields as battery, ultracapacitor materials and environment-friendly automobiles. The method is characterized in simple equipment and process, low production cost, suitability for industrialized production, environment-friendliness, etc.

The invention relates to carbon/graphene composite super-capacitor electrode materials and a preparation method thereof. By filling holes of natural wood with graphene oxide and carrying out high-temperature carbonization, the electrode materials are prepared. The electrode materials comprise penetrating big hole structures which are perpendicular to the plane direction of the electrodes and are formed by carbonizing the wood, and small hole structures formed by graphene. The carbon/graphene composite electrode materials can be independently used without adhesives and conductive agent. The thickness is adjustable, application of non-active materials in a super capacitor assembly process is effectively reduced and a super capacitor with high area specific capacitance and long circulation service lifetime is obtained.

The invention provides a Zr-MOFs/graphene oxide porous composite material. During Zr-MOFs preparation, two template agents with different functions are added at the same time, wherein the template agent A is graphene oxide and has a coordination effect with Zr-MOFs and a carrier function; the template agent B is a functional group with a coordination competition effect, and can remove organic matters by washing after inducing the Zr-MOFs hydrothermal reaction; and the template agent B is an organic matter containing carboxyl. The specific surface area of the composite material is 1326-1602 m<2>/g, and the pore size distribution is 0.2-1.2 nm. The preparation method of the Zr-MOFs/graphene oxide porous composite material comprises the following steps: 1) performing hydrothermal reaction synthesis of the Zr-MOFs/graphene oxide porous composite material; and (2) activating the Zr-MOFs/graphene oxide porous composite material. When the material is applied as a hydrogen storage material, the hydrogen adsorption capacity is 2.5-3.1 wt% under the condition that the adsorption temperature is 77K. The method has the advantages that the experimental process is simple; the hydrogen storage capacity is improved by 24%; the two template agents with different functions are introduced, and the defect degree and the micropore volume of the composite material are improved through competitive coordination.

The invention discloses an oxidation-reduction preparation method for graphene. The oxidation-reduction preparation method comprises the following steps: soaking a certain amount of natural flake graphite powder into concentrated acid; transferring a vessel to a low-temperature environment, adding phosphoric acid, stirring, and then adding strong oxidant and controlling the temperature of a reaction system to be below 5 DEG C; transferring the vessel to a room-temperature environment and then stirring; heating and increasing the temperature, reacting for 6-12h while stirring, diluting by water, and then adding hydrogen peroxide and hydrochloric acid; performing ultrasonic treatment, thereby acquiring a graphene oxide acid solution; adding aluminum foil chippings of the lithium battery current collector into the graphene oxide acid solution, heating and starting the reduction reaction, stirring, removing impurities, and performing vacuum drying, thereby acquiring the graphene. According to the oxidation-reduction preparation method for graphene, the graphene is acquired after the graphene oxide acid solution is directly reduced by the aluminum foil chippings of the lithium battery current collector, so that the experiment technique is simplified, the experimental period is shortened, the impurity introduction is reduced, the adoption of the high-risk and environment-unfriendly raw materials is avoided, the safe and environment-friendly purposes are achieved, the waste of resources is avoided by recycling and reusing and the cost of laboratory is reduced.

The invention discloses a preparing method of a lithium titanate cathode material for a lithium ion battery. The preparing method includes that: a titanium dioxide precursor is prepared and subjected to a hydrothermal reaction; the titanium dioxide precursor is crystallized at high temperature; and the lithium titanate cathode material for the lithium ion battery is obtained. According to the lithium titanate cathode material for the lithium ion battery and prepared in the method, the phenomena of uneven product particle size distribution and product particle conglomeration are avoided. The preparing method simplifies the experimental process, leads practical size of titanium dioxide particles prepared in a hydrothermal method to be on the nanometer level, is favorable for controlling product shape, leads crystallization sintering to be even, and facilitates large-scale production.

The invention discloses a polar sulfide-sulfur/porous carbon composite positive electrode material with a three-dimensional structure and a preparation method of the positive electrode material, and belongs to the technical field of preparation of lithium-sulfur batteries. The polar sulfide-sulfur/porous carbon composite positive electrode material is characterized in that the polar sulfide-sulfur/porous carbon composite positive electrode material with the three-dimensional structure is designed by taking porous carbon with high conductivity and physical absorption as a framework and combining a polar metal sulfide formed in situ with the strong chemical adsorption characteristic. The three-dimensional polar sulfide-sulfur/porous carbon composite positive electrode material is controllably prepared through low-temperature co-melting, uniform mixing, freeze-drying, in-situ carbonization and sulfuration and other steps, an assembled lithium-sulfur battery has stable electrochemical performance, the positive electrode material can be used for the lithium-sulfur battery and will also lay a foundation for the development and application of a novel high-performance lithium-sulfur battery positive electrode material.

The invention discloses a toughening and reinforcing method for a ceramic bonding agent, and belongs to the technical field of ceramic grinding tools. The toughening and reinforcing method comprises the main steps that the ceramic bonding agent is gradually added into a beaker containing deionized water, and a mixture is stirred with a glass rod to be sealed for standby application; carbon fibers,silicon carbide whiskers and graphene oxide are respectively added into the beaker containing the deionized water, after a surface active agent is added for dispersing, mixtures are mixed together, an antifoaming agent is added, and stirring with a magnetic stirrer is carried out; an antifoaming agent is dropped into mixed final mixed slurry and ceramic slurry, a binder is added after stirring with the magnetic stirrer, and a ceramic body is manufactured; and the ceramic body is naturally cooled to the room temperature after sintered in a muffle furnace. The toughening and reinforcing methodhas the beneficial effects that the experiment process is simple, and needed equipment is simple; the structure of the ceramic body prepared after uniform and dispersed slurry forming is more even; and after the carbon fiber-silicon carbide whisker-graphene oxide is added, whisker-shaped binding agent bridge joint structures are evenly distributed around ceramic binding agent particles, and toughening and reinforcing are carried out on the ceramic bonding agent.

The invention relates to a silanization organic phenol-nanometer silicon dioxide system as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing 6 parts by weight of a silicon source and 40 parts by weight of an organic phenol substance into a four-neck bottle, maintaining stirring for half an hour under the conditions of 40 DEG C and 500 r/min, dropwise adding a mixed liquid of 8 parts by weight of an alkaline catalyst and 10 parts by weight of water for 2 hours by a constant-pressure funnel, adding 3 to 6 parts by weight of a silane coupling agent, and performing a reaction for 4 hours to obtain the silanization organic phenol-nanometer silicon dioxide system.

The invention relates to a preparation method of a micrometer grade spherical cobaltosic oxide material. The preparation method comprises following steps: 1, a cobalt salt, polyethylene glycol (PEG),and an alcohol are dissolved in deionized water so as to obtain a uniform solution A; 2, the solution A is introduced into a reaction vessel for hydro-thermal reaction, and washing, drying, and roasting are carried out so as to obtain the micrometer grade spherical cobaltosic oxide material. The preparation method is simple in operation; the raw materials are easily available; product purity, thespherical degree, and the dispersion degree are high; and the preparation method is suitable for industrialized large scale production.

The invention discloses preparation and application of a fluorescence immunochromatography test strip for exosome quantification, and particularly relates to the field of biological detection. The test strip comprises a back plate, a sample pad, a combination pad, an NC membrane and a water absorption pad, wherein the sample pad, the combination pad, the NC membrane and the water absorption pad are pasted on the back plate, the combination pad is in lap joint with one end of the sample pad and one end of the NC membrane, the other end of the NC membrane is in lap joint with the water absorption pad, and a detection line and a quality control line are sprayed on the NC membrane. A mouse anti-human CD9 antibody marked by fluorescent microspheres and rabbit IgG marked by fluorescent microspheres are attached to the combination pad, a mouse anti-human CD9 monoclonal antibody is coated on the detection line, and a goat anti-rabbit antibody is coated on the quality control line. By utilizing the optimized fluorescence immunochromatography technology, the concentration of the exosome can be measured more conveniently, quickly and accurately, and a new technical means is provided for the detection of the concentration of the exosome.

The invention discloses spiral TiO2/graphene composite fiber and a preparation method and application thereof. The preparation method includes: providing a spinning solution containing uniformly dispersed nano-titanium dioxide and/or nano-hydrogenated titanium dioxide and graphene oxide; spinning the spinning solution to prepare spiral TiO2/graphene oxide composite fiber through the wet spinning technology; subjecting the spiral TiO2/graphene oxide composite fiber to reduction and then heating and setting to obtain the spiral TiO2/graphene composite fiber. The invention further discloses a micro-vibration detection system and a relevant micro-vibration detection method. The deformation of the spiral TiO2/graphene composite fiber is caused by vibration, which changes the effective light area of the composite fiber and causes the photocurrent change to carry out vibration detection; easy and simple preparation as well as low cost are achieved, and the micro-vibration detection system ishigh in flexibility and good in stability.

The invention discloses a composite phase change temperature control material based on expanded graphite and non-woven fabric, which is prepared by taking n-octadecane, expanded graphite and non-woven fabric as raw materials through high-temperature modification, vacuum adsorption and a hot pressing method. The obtained material has the characteristics of flexibility, phase change heat storage and temperature control performance. Wherein n-octadecane is a phase change material and has the functions of phase change heat storage and temperature control; the expanded graphite is a framework and plays a heat conduction role; the non-woven fabric serves as a carrier and plays a supporting role. The material can be applied to the fields of heat conduction temperature control and heat storage, the heat storage density is 43.78-105.45 j/g, and the heat conductivity coefficient is 0.762-0.932 W/(m.K).