77results about How to "The preparation process is simple and mature" patented technology

The invention relates to the technical field of soil conditioners and particularly relates to a soil heavy metal biological fixing agent and an application method thereof. The formula of the soil heavy metal biological fixing agent is that every one kilogram of an organic fertilizer is added with 2-10 g (109 CFU/g) of B. natto solid leavening agent, 2-10 g (109 CFU/g) of B.mucilaginosus solid leavening agent, 2-6 g (109 CFU/g) of B.megaterium solid leavening agent and 4-10 g (1010 CFU/g) of Trichoderma koningii solid leavening agent, wherein the main ingredients of the biological organic fertilizer contain more than 40% of organic matter, more than 20 million/g of effective viable count, and more than 5% of total nutrient. The soil heavy metal biological fixing agent is low in cost, has few environmental risks, remarkably reduces the absorption of the heavy metals of the crops, improves the soil fertility, effectively prevents and cures the soil-borne diseases and increases the economic benefit of the crops.

The invention relates to the technical field of conductive membranes, particularly to a nano-silver flexible conductive membrane and a preparation method thereof. The nano-silver flexible conductive membrane comprises a PET substrate layer, wherein corona treatment is performed on the surface of the PET substrate layer; a conductive coating layer which is arranged on the surface of the PET substrate layer comprises the following raw materials in percentage by weight: 50-75% of absolute ethyl alcohol, 2-5% of terpilenol, 1-3% of acetyl tributyl citrate, 2-8% of joint cement, 1-5% of polyethylene glycol 400, 2-3% of span 85, 1.5-3% of ethyl cellulose, 3-8% of silver powder of 20-40 nanometers, and 10-18% of silver powder of 150-450 nanometers. The nano-silver flexible conductive membrane, provided by the invention, has the characteristics of stable surface conductivity of the formed film, low resistivity, high light transmittance and strong adhesive force. The preparation process of the nano-silver flexible conductive membrane is simple and mature, coating equipment is simple, the operation is convenient, the cost is low, and the nano-silver flexible conductive membrane facilitates popularization and application.

The invention discloses a nano coaxial-cable heterojunction array base ultraviolet detector and a manufacturing method thereof. The detector comprises a substrate and a conductive film, a NiO@TiO2 nano coaxial-cable heterojunction array which is used as an ultraviolet absorbing layer and at least one N-type ohmic electrode are arranged on the conductive film, at least one P-type ohmic electrode is arranged on the NiO@TiO2 nano coaxial-cable heterojunction array; and the NiO@TiO2 nano coaxial-cable heterojunction array is composed of a TiO2 nano-tube array and a NiO nano-wire filled in the TiO2 nano-tube. The core structure of the detector provided by the invention is the nano coaxial-cable heterojunction array consisting of the TiO2 nano-tube array and the NiO nano-wire penetrating through the TiO2 nano-tube; the usage rate of a photo-generated carrier can be sufficiently improved, and the nano coaxial-cable heterojunction array base ultraviolet detector has the advantages of high external quantum efficiency and flexibility, small volume and the like.

The invention relates to a preparation method for an epoxy anticorrosive coating, which belongs to the technical field of preparation of anticorrosive coating materials. The method comprises the following steps: dissolving an emulsifier in water, adding ethylenedioxythiophene monomers into an obtained aqueous solution, cooling the aqueous solution in ice-water bath and carrying out stirring so as to obtain emulsion A; dissolving an oxidizing agent in water, cooling an obtained aqueous solution in ice-water bath and carrying out stirring so as to obtain solution B; slowly mixing the solution B and the emulsion A according to a volume ratio of 1:1, carrying out stirring and allowing the solution B to react with the emulsion A in ice-water bath so as to obtain suspending liquid C; adding acetone into the suspending liquid C for demulsification, carrying out filtering, carrying out repeated rinsing with acetone or water so as to obtain polyethylenedioxythiophene and drying polyethylenedioxythiophene at a temperature of 60 DEG C in vacuum so as to obtain solid powder D; and stirring epoxy resin, a curing agent, a diluent and the solid powder D in a container, carrying out ultrasonic treatment for 20 min to 1 h, coating an obtained mixture on a steel plate and curing the steel plate at room temperature so as to obtain the epoxy anticorrosive coating. According to the invention, process route is reasonable, technology is mature, and the prepared anticorrosive coating has the advantages of low cost, excellent performance and good economic effects.

The invention provides a COVID-19 vaccine and a preparation method and application thereof. The COVID-19 vaccine comprises T cells expressing SARS-CoV-2 S protein. The preparation method of the COVID-19 vaccine comprises the following steps that (1), coding genes of the SARS-CoV-2 S protein are inserted into an adenovirus vector to construct a recombinant adenovirus vector; (2), the recombinant adenovirus vector and packaging helper plasmids are used for co-transfecting mammalian cells to prepare recombinant adenovirus; and (3), the recombinant adenovirus is adopted for infecting the T cells to obtain the COVID-19 vaccine. According to the COVID-19 vaccine and the preparation method and application thereof, a virus system is utilized for constructing the recombinant T cells expressing theSARS-CoV-2 S protein, the recombinant T cells are input into a body to continuously express the S protein, the body is induced to generate a specific humoral immune response or a cellular immune response, and the body obtains the protective immunity capacity on SARS-CoV-2.

The invention discloses a plasmon refractive index sensor based on a nano pattern and a sensing method thereof. The sensor comprises a layer of plasmon nano antenna array and a flat transparent substrate supporting the antenna array, the plasmon nano antenna array is a periodic array structure, the period is 50 to 1000 nanometers, and the thickness is 10 to 100 nanometers; the size of a single nano antenna of the array structure gradually changes according to a certain law, and the changing range is from 10 to 10000 nm. The sensor uses an imaging device to detect brightness and color change of a finite difference time domain method nano antenna array on the sensor in to-be-tested medium environment or position change of a resonance nano antenna under monochromatic light or white light irradiation to achieve medium refractive index sensing. The plasmon refractive index sensor has the advantages of simple detection technique, high sensitivity, good stability, low cost of needed detection equipment, and the like.

The invention belongs to the technical field of electronic ceramic packaging material and provides a high-thermal-expansion-coefficient ceramic material for high density packaging and a preparation method thereof so as to overcome the problem of thermal expansion mismatch of existing chip packaging materials. The ceramic material of the invention comprises the following ingredients (by weight): 55-70% of SiO2, 20-30% of BaO, 5-10% of B2O3, 2-5% of Al2O3, 0.1-1% of Y2O3, and 1-3% of a mixture of CrO2 and ZrO2. Thermal expansion coefficient of the ceramic material is 12-15 ppm/DEG C which fits with the thermal expansion coefficient (12-18 ppm/DEG C) of a PCB. Flexure strength reaches up to 170-240 MPa, Young modulus is 50-70 GPa, mechanical property is excellent, and problems such as thermal expansion mismatch, etc. can be completely overcome. Meanwhile, the material has small dielectric constant, low loss and stable properties, and can meet requirements of high density packaging. In addition, the preparation technology is simple, mature, energy-saving and efficient, meets requirements of industrial production, and is convenient for batch production and promotion and application.

The invention discloses an ablation-resistant fiber toughened Si-B-C-N-Zr ceramic matrix composite as well as a preparation method and an application thereof. The preparation method of the ablation-resistant fiber toughened Si-B-C-N-Zr ceramic matrix composite comprises the following steps: S1, preparing Si-B-C-N-Zr powder; S2, performing surface modification treatment on fiber to obtain modifiedfiber; S3, mixing the modified fiber with the Si-B-C-N-Zr powder to obtain composite powder; S4, performing hot pressing and sintering on the composite powder to prepare the ablation-resistant fiber toughened Si-B-C-N-Zr ceramic matrix composite. The prepared ablative-resistant fiber toughened Si-B-C-N-Zr ceramic matrix composite has good microstructure and higher fracture toughness, mechanical property and ablative resistance, used raw materials are widely sourced and low in price, the preparation process is simple and mature, the preparation period is short, all the steps can be realized with existing technologies and equipment, and the composite is suitable for industrial production.

The invention relates to a Cu2ZnSnS4 / MWCNT nano composite counter electrode for a dye-sensitized solar cell and a preparation method thereof. The method comprises following steps that: (1) a hot solvent method is used to synthesize a Cu2ZnSnS4 nanoparticle with a diameter of 200 to 300 nanos; (2) an MWCNT is immersed in a sulfuric acid and nitric acid mixed solution, so as to improve dispersibility of the mixed solution; (3) a Cu2ZnSnS4 / MWCNT nano composite material is stirred and carries out ultrasonic processing so that the composite material is mixed evenly, and the Cu2ZnSnS4 / MWCNT is dissolved in deionized water and forms "ink" by the ultrasonic processing; and (4) a spinning coating method is used so that black "ink" is coated on a conductive substrate, and then the Cu2ZnSnS4 / MWCNT composite counter electrode is obtained by annealing in 450 to 550 DEG C for 0.5 to 2 hours. According to the method, the Cu2ZnSnS4 / MWCNT having good corrosion resistance serves as the counter electrode of the dye-sensitized solar cell, so as to achieve the large surface area, good catalytic and conductive properties, and low production cost; and the battery which is manufactured with adoption of the preparation method, has the same photoelectric conversion efficiency as the battery based on a conventional Pt electrode, is suitable for application to the dye-sensitized solar cell, and is beneficial to the industrialization development of the dye-sensitized solar cell.

The invention belongs to the technical field of beverage processing and relates to a healthcare fruit and vegetable composite beverage. The healthcare fruit and vegetable composite beverage is made from snow pear juice, watermelon juice, aloe juice, Maca juice, okra juice, banana juice and honey. Various fresh fruit and vegetable raw materials are squeezed through a physical method to obtain liquid juice, and the liquid juice is scientifically mixed into the beverage. The beverage is comfortable in taste, has the effects of quenching thirst and soothing the nerves, and can relieve depressive symptoms; the formula is scientific and reasonable, no toxic or side effect exists, the preparation process is simple and mature, the intended population range is wide, the retention cycle is long, the taste is good, and rich nutrients are obtained.

The invention provides etching fluid for a silver nanowire conducting film and an application method thereof. The etching fluid comprises, by mass percent, 10-30% of acetic acid, 5-10% of ammonia water, 10-20% of inorganic metallic salt, 6-16% of hydrogen peroxide, 3-15% of water-soluble polymer, 4% of silicon dioxide, 3% of carboxymethyl cellulose, 2-17% of ethylene glycol and 10-30% of deionizedwater. The silver nanowire conducting film prepared through the etching fluid has the characteristics of being stable in film surface conductivity, low in resistivity, high in light transmittance andstrong in adhesive force. The etching fluid is simple and mature in preparation technological process, simple in equipment, convenient to operate, low in cost and convenient to apply and popularize.Besides, the silver nanowire conducting film prepared through the etching fluid has the characteristics of being good in chemical stability and excellent anti-corrosive performance, does not contain strong acid or strong base, causes little environmental pollution, can be applied to the fields such as electromagnetic shielding and electronic circuits and has extensive application value.

The invention discloses a preparation method of an ultra-thin carbon nano tube wave-absorbing coating material. According to the preparation method, surface strong oxidation treatment is carried out on a carbon nano tube by a method of mixing strong acid with a strong oxidant, and a modified carbon nano tube with a special ''wool-shaped'' surface appearance is prepared. Different high polymer materials are selected as a matrix, and the ultra-thin broadband carbon nano tube wave-absorbing coating material is obtained by adjusting the proportion relation between the content of an absorbent and the high polymer materials. The coating material prepared by the method overcomes the defects of large thickness, large mass, narrow absorption frequency band, complex preparation process and the likeof a conventional wave-absorbing coating material. When the thickness of the coating is 1.0 mm or below, full-band absorption of the X wave band and the Ku wave band of radar waves of -4dB or below can be realized, and the frequency width of reflection loss less than -10dB can reach 5.23GHz.

The invention discloses a heterojunction array based ultraviolet detector and a manufacturing method thereof. The detector comprises a substrate and a conductive film; an Sm2O3@ZnO heterojunction array which is used as an ultraviolet absorbing layer and at least one N-type ohmic electrode are arranged on the conductive film; at least one P-type ohmic electrode is arranged on the Sm2O3@ZnO heterojunction array; and the Sm2O3@ZnO heterojunction array is composed of a ZnO nano-tube array and an Sm2O3 nano-wire filled in the ZnO nano-tube. The core structure of the detector provided by the invention is the heterojunction array consisting of the ZnO nano-tube array and the Sm2O3 nano-wire penetrating the ZnO nano-tube; the usage rate of a photo-generated carrier can be sufficiently improved, and the heterojunction array based ultraviolet detector has the advantages of high external quantum efficiency and flexibility, small volume and the like.

The invention discloses a moisturizing cosmetic capable of refining pores. The moisturizing cosmetic is prepared from the following components in parts by weight: 0.1-0.8 part of plant active ingredients, 60-66 parts of a surfactant, 8-12 parts of a humectant, 2-3 parts of an antistatic agent, 1-1.5 parts of a thickener, 0.3-0.5 part of a pH modifier, 0.3-0.4 part of a preservative and deionized water added to 100 parts. The moisturizing cosmetic is capable of providing the skin surface with moisture and maintaining normal vital movement of epidermis cells, so that formation of a healthy sebum membrane on the skin is facilitated and the moisture content of the skin is effectively kept; coarse pores can be converged and refined, the evaporation capacity of the moisture in the skin is reduced and the moisture content of the skin is kept, so that the skin is moisturized, fine lines of canthus are reduced, the phenomena of skin dryness and peeling, tension and cutaneous pruritus are improved, skin cells have certain wettability even if a cold and dry environment exists and the phenomenon of extreme hydropenia is avoided.

The invention discloses application of a Fe3O4/mTiO2 magnetic mesoporous nanometer material in degradation of pesticide and belongs to the technical field of micro-nanometer photocatalytic materials. The Fe3O4/mTiO2 magnetic mesoporous nanometer material is used as a photocatalyst to be applied to adsorption and degradation of organophosphorus pesticide; the Fe3O4/mTiO2 magnetic mesoporous nanometer material relies on surface mesoporous TiO2 to absorb the organophosphorus pesticide to the TiO2 mesoporous surface; then, under the irradiation of ultraviolet light, TiO2 active sites are excited to degrade absorbed organophosphorus molecules to generate low-toxicity or even non-toxic products; after the reaction, the photocatalyst can be adsorbed and separated through a magnet. The operation is simple and easy to perform. By applying the Fe3O4/mTiO2 magnetic mesoporous nanometer material to adsorption and degradation of the organophosphorus pesticide, the application is novel and advanced, practical significance is achieved, and the material preparation process is simple and mature, easy to operate, low in cost and free of secondary pollution.

The invention relates to a photonic crystal beam splitter which realizes the beam splitting and propagating of the inputted optical signals by the auto-collimation effect of the SOI (silicon on insulator) based two-dimensional flat air-hole photonic crystal, belonging to the field of optical technology of the semiconductors. The photonic crystal beam splitter comprises an SOI substrate, an air hole area and an SOI stripe-shaped waveguide; the air hole area is formed on the top-layer silicon of the SOI substrate by etching silicon; the SOI stripe-shaped waveguide is used for connecting the air hole area with the external optical fiber or other devices; the air holes formed by etching silicon in the air hole area are arrayed on the top-layer silicon of the SOI substrate like square crystal lattices; the depth of the air holes is equal to the thickness of the top-layer silicon of the SOI substrate; and the SOI stripe-shaped waveguide is the inputting waveguide of the beam-splitter and keeps a certain distance with both the air hole area and two borders which are parallel to the inputting waveguide. The length of the beam splitting area of the beam splitter can be controlled with 10mum, thus the overall length of the device is reduced greatly, and the structure is more compact. In addition, the photonic crystal beam splitter has large preparation tolerance and more flexible design and can be more widely used for the future photonic chip.

The invention provides a nylon 1/polyvinylidene fluoride composite dielectric film and a preparation method thereof, and relates to the technical field of composite materials. The film is prepared from the following components in percentage by weight: 80 to 99 percent of polyvinylidene fluoride and 1 to 20 percent of nylon 1. The invention further provides a preparation method of the nylon 1/polyvinylidene fluoride composite dielectric film. The preparation method comprises the following steps: mixing polyvinylidene fluoride and nylon 1, and mixing on a torque rheometer at 180-200 DEG C for 10-20 minutes; and carrying out hot pressing on the mixed product on a press vulcanizer at 180-200 DEG C for 10-20 minutes, and maintaining the pressure at room temperature for 3-10 minutes to obtain the nylon 1/polyvinylidene fluoride composite dielectric film. The dielectric constant of the polyvinylidene fluoride is improved, the dielectric loss of the polyvinylidene fluoride is kept at a low level, various problems caused by poor compatibility are reduced, and therefore the functional characteristics of the polyvinylidene fluoride are improved.