71results about How to "Piezoelectric" patented technology

The invention discloses an anion converter solving the problems of low kinetic energy of free electrons generated by the traditional equipment for combining and reacting with air molecules to generate anions and full short circuit caused by high voltage in the equipment to the ground. The anion converter comprises a high-voltage insulating housing, a stainless steel electron collector, a pumice with a dielectric property, a first conducing wire and a nano carbon fiber bundle, wherein the first conducting wire is used for conducting free electrons generated by open type single-pole anion generator, and the nano carbon fiber bundle is connected to the end of the first conducting wire. The anion converter can effectively increase the kinetic energy of the free electrons so that diffused electrons have large air contact area, and the anion converter has the advantages of large anion generation amount, high purity and remote transmitting distance; and the high-voltage insulating housing with high-voltage insulation can effectively prevent the full short circuit caused by a outward transmitting module of the air anions to the ground from burning instruments.

The invention discloses a piezoelectric polyvinylidene fluoride porous membrane and a preparation method thereof. The piezoelectric polyvinylidene fluoride porous membrane is characterized by being prepared by dissolving polyvinylidene fluoride into a mixed solution of N,N-dimethyl formamide and an ionic liquid by using an immersion-precipitation method, wherein the w / v concentration of the polyvinylidene fluoride in the mixed solution is 10-20%, the volume ratio of the N,N-dimethyl formamide in the mixed solution is 60-95%, and the volume ratio of the ionic liquid is 5-40%. The piezoelectric polyvinylidene fluoride porous membrane provided by the invention has excellent water flux and meets the requirement for the performance of an industrial separation membrane; and meanwhile, the prepared polyvinylidene fluoride porous membrane is a beta crystal with a piezoelectric effect and can vibrate under a low alternating electric field, so that the antipollution capability of the separation membrane can be further improved, and the separation efficiency of the membrane can be further increased.

The invention discloses a piezoelectric friction electric hybrid wearable nano generator and a preparation method thereof. The core is that a non-woven fabric having piezoelectricity and a nanowire-coated microsphere secondary micro-nano structure is prepared. Spinning liquid is directly spun into the non-woven fabric with the secondary micro-nano structure by a self-assembled far-field electrospinning and high-speed wire collection method. The non-woven fabric and other materials are assembled into the piezoelectric friction electric nano generator. The hybrid nano generator includes a firstelectrode, an elastic friction layer, a piezoelectric friction electric active layer, a second electrode, a high-molecular polymer supporting layer, an adhesive layer and a wire. The nano generator isa wearable device. The piezoelectric friction electric hybrid wearable nano generator is simple in preparation process, easy to operate and low in cost, and can be massively produced.

The invention discloses an artificial quartz stone sheet and a preparation method thereof. The artificial quartz stone sheet comprises the following components in parts by weight: 30-90 parts of 6-80mesh calcined quartz sand, 30-70 parts of 325mesh quartz powder, 5-15 parts of broken glass, 3-10 parts of 30-50mesh tourmaline, 3-12 parts of 50-100mesh sillimanite powder, 3-12 parts of 100-200mesh zirconium silicate powder, 5-10 parts of unsaturated resin, 0.3-2 parts of a silane coupling agent, 0.3-2 parts of a curing agent and 0.1-1 part of a pigment. By the calcined quartz sand, the hardness of the artificial quartz stone sheet is increased so that the artificial quartz stone sheet resists wear and is difficult to be scratched; tourmaline is added so as to increase the antimicrobial property of the artificial quartz stone sheet and meanwhile, sillimanite powder and zirconium silicate powder are added to improve the fireproof performance of the artificial quartz stone sheet.

The invention discloses efficient tiny-dust-proof window gauze capable of releasing negative ions and a manufacturing method of the efficient tiny-dust-proof window gauze. A negative ion functional film layer is attached to the window gauze and is a film layer capable of releasing the negative ions, the film layer is formed by negative ion powder and high polymer materials with the adhesion function in a spraying mode, and therefore the window gauze has the function of releasing the negative ions while being used for filtering dust, the content of the negative ions in air passing the window gauze can be increased, the quality of the air entering a room can be improved, adverse affects caused by outdoor atmospheric pollution on indoor work and life of people are reduced, and body health of people is guaranteed. Besides, on the basis that the negative ions have a special aggregation effect on tiny dust, the dust has positive charges, the negative ions in the air can make the tiny dust aggregated, the tiny dust can settle to become large particles capable of being intercepted by a filtering layer of the window gauze more easily, and the tiny dust intercepting efficiency of the filtering layer of the window gauze can be improved.

The invention relates to a gel polymer modified lithium ion battery diagraph and a preparing method and application thereof. The diagraph comprises a microporous polymer layer and at least one layer of gel polymer coating coated with which the microporous polymer layer is coated. The peel strength between the gel polymer coating and the microporous polymer layer in a 180-degree-condition is over 1.0N / cm. The surface and the interior of the gel polymer coating are in reticular porous connecting structures. The porosity of the gel polymer coating is over 40%. A gel polymer is a copolymer of vinylidene fluoride and hexafluoropropylene. According to the invention, the problems that the adhesion between the gel polymer coating and the microporous polymer layer is poor and the gel polymer coating is easy to strip from the polymer microporous layer are solved, and the problem that the gel polymer coating swells in electrolyte as to enable the coating porosity to be reduced, and further the battery internal resistance is increased is solved.

The invention discloses a composite piezoelectric catalyst as well as a preparation method and application thereof in sound catalytic cracking hydrogen production from water. The preparation method comprises the following step: by virtue of an oxygen vacancy defect on the surface of zinc oxide, performing in-situ reduction on the zinc oxide on the surfaces of nano rods to form an elementary substance of gold, thereby obtaining a ZnO-Au composite piezoelectric catalyst, wherein the zinc oxide nanorods with special orientation generate positive and negative charges on the surfaces by enriching sound wave energy in an environment through a piezoelectric effect, then pure water decomposition can be promoted, and hydrogen can be generated; in addition, after the elementary substance of gold isloaded, the hydrogen production capability of the ZnO-Au composite piezoelectric catalyst can be greatly improved, the hydrogen generation velocity of the ZnO-Au composite piezoelectric catalyst undersound wave driving is 4 times that of non-loaded zinc oxide nanorods, limits of a single piezoelectric material as a sound catalyst are broken through, efficient utilization of sound energy is achieved, a novel way is provided for water cracking hydrogen production under the piezoelectric effect, and the composite piezoelectric catalyst has wide application prospects in the field of mechanical energy-hydrogen energy conversion, and is simple in preparation method and applicable to industrial production.

The invention discloses a system device with co-action of ultrasonic wave and far infrared ray on an engine, comprising a fuel action unit, a machine oil action unit, a cooling water action unit, an ultrasonic generator, a fuel temperature sensor and a singlechip. The action units are provided with far infrared ceramics and ultrasonic energy converters which are connected with the ultrasonic generator. The electric heaters of the three action units are electrically connected with the heating temperature controllers. The heating temperature controllers, the ultrasonic generator and one or more sensors are connected with a singlechip through an interface circuit. By using sound pressure generated in liquid medium of the ultrasonic wave, the system device raises temperatures of the fuel, machine oil and water medium so as to excite the far infrared ceramics in the medium and change macromolecule groups of the medium into micromolecule groups or single molecules under the action of far infrared ray, and the medium is activated adequately. The invention can remarkably enhance the dynamic property, the economical efficiency and the environmental-friendliness of the engine. The system device can be used as a fuel filter and a machine oil filter.

The invention discloses a high-voltage high-energy density unleaded ceramic dielectric material. The components of the material are expressed through the general formula (0.95-x-y-z)Bi0.5Na0.5TiO3-xBi0.5K0.5TiO3-yBa0.65Sr0.35TiO3-zK0.5Na0.5NbO3-0.05LiTaO3, wherein x, y, z represent mole fractions; x is larger than or equal to 0.002 and smaller than or equal to 0.3; y is larger than or equal to 0.002 and smaller than or equal to 0.2; z is larger than or equal to 0.001 and smaller than or equal to 0.3. The material is sintered by adopting electric discharge plasma; uniform dense ceramic texture can be obtained at a low sintering temperature; the ceramic has excellent energy storage density, energy storage efficiency and high voltage electricity constant; the energy storage density can reach 1.75 J / cm<3>; the energy storage efficiency can reach 65%; the piezoelectric constant d33 can reach 682 pm / V; the practicability is good.

The invention discloses a CdS / ZnO composite piezoelectric photocatalyst and a preparation method and application thereof. The method comprises the steps that firstly, a ZnO nanorod is synthesized through a solvothermal method, and then a chemical bath is carried out to synthesize the CdS / ZnO composite piezoelectric photocatalyst by taking the ZnO nanorod as a precursor through the action of electrostatic adsorption. The catalyst is a piezoelectric photocatalyst formed by compounding CdS and ZnO which have piezoelectric properties, the catalyst utilizes a piezoelectric electric field to promotethe separation of photo-generated carriers for enhancing the photocatalytic activity, the interior and space separation of the photo-generated carriers is also achieved, thereby reducing the recombination of the photo-generated carriers and increasing the utilization rate of the solar energy, and the piezoelectric photocatalytic rate reaches 5.477 min<-1>, which is four times of the photocatalytic efficiency of CdS alone. The CdS / ZnO composite piezoelectric photocatalyst and the preparation method and application thereof have the advantages that the raw materials are easy to obtain, the preparation method is simple, the operation is convenient, the stability of the composite material is better, and a feasible strategy is provided for improving the photocatalytic performance.

The invention discloses a one-dimensional cadmium sulfide nanorod catalyst, and a preparation method thereof and an application thereof in producing hydrogen through acoustic catalytic cracking of water. The catalyst has a wurtzite crystal structure, and is non-centrosymmetric crystal. The catalyst satisfy the structural condition of piezoelectric crystal. The specially oriented nanorod shape of the catalyst can enrich environmental soundwave energy through piezoelectric effect, such that negative charge is produced on the surface of the nanorods. Therefore, pure water cracking is catalyzed, and hydrogen gas is produced. The preparation method mainly relates to a one-step solvothermal method. Cadmium sulfide growth orientation is regulated with the coordination or chelation effect of crystal seeds and diethylenetriamine solvent molecules, and the one-dimensional nanorod morphology is obtained under appropriate reaction temperature and reaction time conditions. The activity of the obtained cadmium sulfide nanorods for cracking pure water to produce hydrogen under sound driving is substantially higher than those of nano-flake wurtzite-type cadmium sulfide sample, micro-spherical wurtzite-type cadmium sulfide sample, and nanorod wurtzite-type cadmium sulfide samples obtained with a traditional two-step synthesis method. The cadmium sulfide nanorod catalyst provided by the invention has a good application prospect in the field of sound energy-hydrogen energy conversion. The preparation method is simple to operate, and is suitable for industrialized production.

The invention discloses modified asphalt concrete for purifying air, which comprises traditional asphalt concrete and tourmaline, wherein the use quantity of the tourmaline is 10-40% of the mass of asphalt in the traditional asphalt concrete, and the tourmaline is tourmaline powder and / or tourmaline anion powder. The modified asphalt concrete has remarkable air purifying effect and can effectively purify NOX (Nitrogen Oxide and Nitrogen Dioxide), HC (Hydrocarbon Compounds), CO (Carbon Monoxide) and other harmful gases exhausted by automobiles. Meanwhile, the modified asphalt concrete has certain effect of absorbing greenhouse gas CO2 (Carbon Dioxide) and can obviously improve road surrounding environment. The modified asphalt concrete has the advantages of excellent pavement performance, simple construction technology and nontoxic and harmless raw materials and has great social benefits in the aspects of improving the application quality of asphalt pavement and protecting the environment.

The invention discloses a microbial fuel cell electrode having a photocatalytic synergistic effect as well as a preparation method and an application of the electrode. The electrode comprises a carbon cloth supporting body, a tourmaline and reducing substance mixed powder layer and a modified photocatalytic material, wherein the tourmaline and reducing substance mixed powder layer are attached to the outer surface of the carbon cloth supporting body, and the modified photocatalytic material is attached to the surface of the tourmaline and reducing substance mixed powder layer. Microbes and a photocatalyst in the electrode have a coupling effect during degradation of wastewater; the modified photocatalyst has the visible-light response, and limitations on usage conditions of the photocatalyst are greatly reduced; tourmaline has pyroelectricity and piezoelectricity and can produce permanent weak current, the service life of hole-electron pairs produced on the surface of the photocatalytic material is prolonged under the effect of the current, and the photocatalytic efficiency is improved. Besides, tourmaline and reducing substance mixed powder can effectively ease transfer of holes-electrons or oxidized ions produced by photocatalysis to a biological membrane, and the activity of the microbes is guaranteed.

The invention discloses an artificial quartzite plate and a manufacturing method thereof. The artificial quartzite plate is composed of the following components in parts by weight: 30-90 parts of 3-80-mesh quartzite, 30-70 parts of 325-mesh quartz powder, 5-15 parts of cullet, 3-10 parts of 30-50-mesh tourmaline, 3-12 parts of 50-100-mesh sillimanite powder, 3-12 parts of 100-200-mesh zirconium silicate powder, 0.1-2 parts of antioxidant, 5-10 parts of unsaturated resin, 0.3-2 parts of silane coupling agent, 0.3-2 parts of curing agent and 0.1-1 part of pigment. The antioxidant is added to the raw materials, thereby enhancing the oxidation resistance and ultraviolet resistance of the artificial quartzite plate. The tourmaline is added to the raw materials to effectively enhance the antibacterial property of the artificial quartzite plate, and thus, the artificial quartzite plate has long antimicrobial effect. The sillimanite powder and zirconium silicate powder, which are favorable refractory materials with very high melting point and hardness, can enhance the refractory temperature of the artificial quartzite plate, prolong the refractory time and increase the compression strength.

The invention relates to an automobile catalyst and particularly relates to an automobile fuel saving and emission reducing mineral catalyst comprising the following components: SiO2, Al2O3, MgO, K2O, TiO2, MnO, Na2O and trace rare-earth minerals, wherein rear-earth metals contained in the trace rare-earth minerals in the whole catalyst account for 0.01-0.1% of the total weight of a catalytic system. The automobile fuel saving and emission reducing mineral catalyst is an inorganic mineral composition and mainly comprises silicon oxide. The automobile fuel saving and emission reducing mineral catalyst has thermoelectricity and piezoelectricity, can generate charges, release a great number of negative ions and radiation far infrared rays under a convection current condition or when heated, pressurized or excited by other energy, and has a special electromagnetic wave function. The automobile fuel saving and emission reducing mineral catalyst can be placed into an air inlet valve and an air filter, and can be used for improving the activity of an oxygen molecule so that the combustion efficiency is increased.

The invention relates to the field of automobile component part repair liquids, in particular to a function repair liquid and a repair powder for an oxygen sensor and a three-way catalyst. The repair liquid comprises the following raw materials in parts by weight: 10 to 30 parts of weak acid or weak alkaline, 2 to 5 parts of inorganic bentonite, 2 to 5 parts of nanometer negative ion powder, and 60 to 86 parts of water. The function repair liquid has the advantages that the function repair liquid can enter the interior of deposited carbon, the deposited carbon structure can be loosened, and the oxide particles attached to the surface of the catalyst can be eroded; the problems of carbon deposition and heavy metal poisoning of the three-way catalyst and the oxygen sensor can be effectively solved, and the corrosion function on platinum, rhodium and palladium metals is little; the emission of tail gas can reach the national standard after the function repair liquid is used. The invention also provides a preparation method and a use method of the function repair liquid, and the function of the function repair liquid can be further improved.

The invention discloses an application of a cadmium sulfide two-dimensional nano-sheet in hydrogen and oxygen production by acoustic wave assisted photolysis of water, wherein the two-dimensional cadmium sulfide nano-sheet is a wurtzite crystal structure and belongs to non-central symmetric crystal. The specially oriented nano-sheet can accumulate acoustic energy in the environment through piezoelectric effect. An electric field is generated on the surface of the nanometer. The electric field can promote the separation of photo-generated carriers, and promote the photocatalytic decomposition of pure water to generate hydrogen and oxygen. The cadmium sulfide nano-sheet can decompose water into hydrogen and oxygen under the co-action of solar energy and acoustic energy without adding a terminator, has wide application prospect in the field of hydrogen energy. The preparation method has simple operations and is suitable for industrial production.

The invention discloses an anti-aging and antibacterial artificial quartzite board and a manufacturing method thereof. The artificial quartzite board is composed of the following components in parts by weight: 40-90 parts of 3-80-mesh quartzite, 30-70 parts of 325-mesh quartz powder, 5-15 parts of cullet, 5-10 parts of unsaturated resin, 0.1-2 parts of antioxidant, 3-10 parts of 30-50-mesh tourmaline, 0.3-2 parts of coupling agent, 0.3-2 parts of curing agent and 0.1-1 part of pigment. According to the invention, the antioxidant and the tourmaline are added in the preparation process to improve the anti-aging performance and the antibacterial performance of the artificial quartzite board, the physical properties and the chemical properties are good, the service life is long, and meanwhile, the manufacturing method provided by the invention is simple and is suitable for industrial production.

The invention discloses a red long-afterglow crystal material and a preparation method thereof. The long-afterglow material is a single crystal with a structure belonging to the trigonal system, is ofABO3 type and has chemical formula of LiNbO3:Mg<2+>, Pr3<+>. In the formula, LiNbO3 is the matrix, Mg<2+> and Pr3<+> are doping components. The doping component Mg<2+> accounts for 1mol%-6mol% of thematrix, and the doping component Pr3<+> accounts for 1mol%-3mol% of the matrix. The preparation method comprises the steps of batching, pre-sintering and pulling growth. The red rare earth long-afterglow luminescent crystal can be excited by ultraviolet light irradiation or X-ray irradiation to emit red light (central wavelength 619 nm) and has long afterglow. The material can be applied to application occasions such as ultraviolet light and X-ray detection, optical storage, safety identification, high temperature sensing, force sensing and the like, and has the advantages of low cost, high thermal stability, mechanical stability and the like.

The invention discloses a material for dental restoration. The material is prepared from a slurry material or a powder material, wherein the powder material is prepared from the following raw materials by mass percent: 75-99.5% of a ceramic material, 0.5-10% of a tourmaline material and 0-15% of rare earth elements; the slurry material is prepared from the powder material, water and additives, wherein the mass ratio of the powder material to the water is equal to (2 to 6.5) to (3.5 to 6), and mass of the additives account for 0.5-5% of the total mass of the slurry material. According to a preparation method of the material for the dental restoration, the dental restoration is prepared by molding the material for the dental restoration. By adding tourmaline and rare earth into the ceramic material, not only is the attractive dental restoration with good mechanical property and good biocompatibility prepared, but the prepared dental restoration is also enabled to have good far infrared characteristic at the same time. According to the preparation method, the technologies such as grinding and milling can be carried out without needing presintering, and a special mould is not needed, so that the process is greatly simplified, and the cost is reduced.

The invention discloses an artificial quartz stone panel and a preparation method thereof. The artificial quartz sand panel is prepared from the following components in parts by weight: 30-90 parts of 3-80mesh quartz stones, 20-60 parts of 325mesh quartz powder, 5-15 parts of cullet, 3-10 parts of shells, 3-10 parts of fibers, 3-10 parts of 30-50mesh tourmaline, 3-12 parts of 50-100mesh sillimanite powder, 3-12 parts of 100-200mesh zirconium silicate powder, 5-10 parts of unsaturated resin, 0.3-0.5 part of auxiliaries and 0.3-0.8 part of pigments. According to the artificial quartz stone panel disclosed by the invention, in the preparation process, the fibers and tourmaline are added, so that the compressive property and the antibacterial property of the artificial quartz stone panel are improved and meanwhile, the sillimanite powder and the zirconium silicate powder are added, so that the fireproof performance of the artificial quartz stone panel is improved.

A preparation method of polyvinylidene fluoride micrometer bulb tube comprises the following steps: (1) heating a mixture of polyvinylidene fluoride and polybutyl acrylate, maintaining the temperature to eliminate the thermal history, then quickly cooling the mixed molten liquid to a temperature of 170 DEG C; (2) utilizing a polymethyl siloxane plate to apply a pressure of 104 to 105 Pa on the molten liquid to exert a shear stress, allowing the molten liquid to stand still to make polyvinylidene fluoride crystallize; (3) soaking the blend, which has totally crystallized, in a chloroform solution to etch off the polyacrylic ester component, soaking the blend for three days to only leave polyvinylidene fluoride crystals in the blend, taking out and drying the polyvinylidene fluoride crystals, and detecting with a scanning electron microscope so as to obtain the polyvinylidene fluoride micrometer bulb tube. The preparation method has the advantages of simple and practicable technology, and low cost. The obtained micrometer tube has the characteristic of large contact surface area, can be used as a micrometer tube wire, micrometer absorbent, and micrometer deodorant, and is advantageously used in the fields of microelectronics, absorption theory, and physical catalyst theory.

Herein disclosed are a piezoelectric device, an ultrasonic probe, an ultrasonic diagnostic apparatus, a nondestructive testing device, and a method of producing one or more piezoelectric devices respectively having predetermined thickness distributions equal in shape to one another with high precision to realize an ultrasound diagnosis with high reliability. The method of producing one or more piezoelectric devices comprises a molding process of: molding a mixture of raw materials including piezoelectric ceramic powders and a binding agent immersed in a solvent to form a plurality of sheet-like raw material elements 6 each having a thickness in a range of a few ten microns to a few hundred microns by way of, for example, a Doctor Blade technique, a laminating process of laminating a plurality of sheet-like raw material elements 6 to obtain a piezoelectric element 7, a pressing process of imparting pressing forces to the piezoelectric element 7 to obtain a piezoelectric element 7a having a predetermined shape, and a burning process of burning the piezoelectric element 7a.

The invention discloses a method for stripping perovskite oxide piezoelectric thin film on graphene by using metal stress layer, comprising the following steps: 1) selecting perovskite oxide piezoelectric thin film grown on the graphene layer; 2) selecting metal Cr as that material of the metal stress layer; 3) in that growth proces of the Cr metal stress layer, the argon gas pressure is control to be 0.3 to 1.0 Pa; The Cr metal stress layer was grown at low power of 40-100W for 5 - 10min, and then grown at high power of 150W-200W for 2h. 4) the Cr stress layer / film / graphene / adhesive tape on the substrate obtained in the step 3), and tearing the adhesive tape off the substrate to realize the peeling off of the piezoelectric film. In order to simply prepare the perovskite oxide piezoelectric thin film with high quality on any flexible substrate, the invention realizes the peeling off of the perovskite oxide piezoelectric thin film and further completes the transfer of the thin film by utilizing the weak Van der Waals force and the metal stress layer formed by contacting the graphene with the three-dimensional material.

The invention provides a simulated remediation system and a method for underground water containing 1, 2-dichloroethane. According to the system, a rectangular tank-type shell with an opening in the top is sequentially divided into a pollution source section, a pollutant migration and transformation section and a pollutant remediation section from left to right; the sample space layers of the pollution source section and the pollutant migration and transformation section are soil sample filling layers; the sample space layer of the pollutant remediation section is sequentially provided with apyrite filling layer, an oxide filling layer and a tourmaline filling layer from left to right. Pyrite is adopted to catalyze persulfate; the natural material tourmaline is introduced into the Fenton-like reaction, so that the pH value and redox potential of the aquifer are optimized, the remediation environment of persulfate in underground water on 1, 2-dichloroethane is integrally improved, andthe effectiveness and practicability of an in-situ chemical oxidation system in remediation of degradation-resistant organic polluted underground water are obviously improved.

The invention discloses a method for inducing stem cell differentiation by utilizing bacterial cellulose piezoelectric hydrogel. The method comprises the following specific steps: treating flake bacterial cellulose hydrogel with SDS deionized aqueous solution, treating with a NaOH deionized aqueous solution, and fully soaking and cleaning with deionized water; placing flake bacterial cellulose hydrogel pieces into a pore plate; digesting stem cells cultured in a cell culture bottle, dispersing to obtain stem cell suspension by using a cell culture medium, inoculating to the surface of the flake bacterial cellulose hydrogel in the pore plate, culturing for 1-90 days, and detecting the content and expression level of specific proteins and genes related to neural differentiation in cells. Theinvention first discovers and discloses a method for inducing stem cells to be differentiated to nerves or glial cells by using the bacterial cellulose piezoelectric hydrogel, and tests prove that the effect of differentiating the stem cells to the nerves or glial cells by virtue of the flake bacterial cellulose hydrogel is excellent.

The invention relates to a tourmaline function mineral organic fertilizer. The mineral organic fertilizer is prepared from tourmaline powder, mineral powder, multi-element substances and solid organic matter according to the mass ratio of (5-30):(30-50):(0-10):(30-90). The fertilizer prepared by using the method has the advantages of obviously increasing yield, improving soil conditions and balancing ecological environment, the preparation technology and the use method of the fertilizer are simple, the cost is low, and the fertilizer conforms to the Chinese regulations, and is environmentally friendly, free of pollution and capable of being used as the fertilizer for green food.

The invention discloses a magnetoelectric electret with an adjustable magnetoelectric effect and a preparation method of the magnetoelectric electret. The magnetoelectric electret comprises a layer ofmagnetoactive polymer matrix and a layer of polymer matrix with surface charges, and the magnetoactive polymer matrix and the polymer matrix with the surface charges are bonded or stacked to form a sandwich structure in which two layers of materials sandwich one layer of charges. The magnetoelectric effect of the magnetoelectric electret is adjusted according to the charge quantity of the polymermatrix with the surface charges, the doping quantity of the magnetic powder in the magnetic active polymer matrix, the thickness ratio of the magnetic active polymer matrix to the polymer matrix withthe surface charges and the size of an external magnetic field. The invention further discloses a preparation method of the magnetoelectric electret, and the preparation method is simple, is low in manufacturing cost, is easy for large-scale production, and can be used in the fields of energy capture, flexible sensors, artificial skin, artificial muscles, self-powered equipment and the like.

The invention relates to a piezoelectric touch control film. The piezoelectric touch control film comprises a transparent flexible substrate, a metal electrode and a [beta]-phase polyvinylidene fluoride-based piezoelectric film which are sequentially arranged, the piezoelectric touch control film is transparent, the light transmittance of the piezoelectric touch control film is above 80%, the piezoelectric film is prepared by a solution-processable piezoelectric material through adoption of a coating method, and the piezoelectric material comprises a vinylidene fluoride-based polymer and a molecular ferroelectric with a plurality of polar axes. The preparation method comprises the following steps of: providing a substrate, wherein the substrate comprises a transparent flexible substrate and a metal electrode arranged on the transparent flexible substrate; and coating the solution containing the piezoelectric material on a base material to form a liquid film on the base material, and removing the solvent to obtain the piezoelectric touch film. The piezoelectric touch control film is flat and compact, controllable in thickness and high in transparency and has better piezoelectricitywithout electric field polarization, and the method is quick and efficient, can be achieved at a room temperature, and is suitable for large-area production.

The invention discloses a preparation method and application of a piezoelectric-triboelectric coupling induction material, and the preparation method comprises the following steps: S1, dissolving hydroxy propyl cellulose, chitosan and carbon nanotubes in an acidic solution to prepare a hydroxy propyl cellulose / chitosan / carbon nanotube solution; and S2, casting the hydroxy propyl cellulose / chitosan / carbon nanotube solution on a polytetrafluoroethylene substrate, and drying to obtain the piezoelectric-triboelectric coupling sensing material. According to the sensing material, the HPC, the CTS and the CNT are adopted to prepare the positive electrode of the piezoelectric-triboelectric coupling sensing material through a tape casting method, and a film with piezoelectric performance is also prepared, so that the sensing material has excellent mechanical performance and signal conversion performance.