444 results about "Piezoelectricity" patented technology

The invention relates to a preparation method and application of a Janus structure photo-thermal-piezoelectric hydrogel dressing for infected wound repair, and the preparation method comprises the following steps: respectively dissolving phenylboronic acid grafted methacrylamide gelatin and dopamine grafted hyaluronic acid in deionized water, adding MXene coated CeO2 heterojunction, and ultrasonically dispersing uniformly, so as to obtain the Janus structure photo-thermal-piezoelectric hydrogel dressing for infected wound repair. After mixing, sodium hydroxide is used for adjusting the pH value to alkalescence, and a Janus structure inner layer is formed; respectively dissolving phenylboronic acid grafted gelatin and o-nitrobenzyl alcohol grafted hyaluronic acid in deionized water, adding BaTiO3, ultrasonically dispersing uniformly, and mixing to form a Janus structure outer layer; the Janus structure photo-thermal-piezoelectric hydrogel dressing prepared by the invention has the characteristic of space-time release so as to adapt to the wound repair process, in addition, the Janus structure photo-thermal-piezoelectric hydrogel dressing also has excellent photo-thermal conversion performance, bacteria infecting the wound are killed through photo-thermal heating, physiological electric signals are effectively simulated through the piezoelectric effect, cell behaviors are regulated and controlled, and the Janus structure photo-thermal-piezoelectric hydrogel dressing can be used for wound infection repair.

The utility model relates to the technical field of acceleration sensors, in particular to a piezoelectric acceleration sensor, which comprises a shell, a mounting cavity is arranged in the shell, a shielding shell is fixedly connected in the mounting cavity, a crystal base is fixedly connected at the bottom end in the shielding shell, a PCB (printed circuit board) is arranged at the upper part in the shielding shell, and the crystal base is fixedly connected with the crystal base. An external force is applied along the polarization direction of the ceramic wafer to deform the ceramic wafer, the inside of the ceramic wafer is polarized, charges with opposite polarities appear on the two stressed end faces, and the ceramic wafer is recovered to an initial state if the external force is removed, so that mechanical energy is converted into electric energy by utilizing the direct piezoelectric effect of the ceramic wafer, and then the electric energy is subjected to signal processing; the sensor outputs 100mv / g alternating current voltage, so that vibration acceleration signals are measured, triangular shearing is adopted by a measuring element, a two-core shielding cable is adopted by a cable, and the sensor is small in size, light in weight and high in applicability.

The invention discloses a fine gap-adjustable tilting pad bearing and a control method, and belongs to the technical field of bearings, and the fine gap-adjustable tilting pad bearing comprises a bearing body, pads, pre-tightening screws, set screws, a cover plate, a displacement amplification structure, pre-tightening bolts, elastic gaskets and piezoelectric ceramic stacks. A plurality of tilting pads are arranged on the inner arc surface of the bearing body and are matched with the bearing body through a spherical support; four radial grooves are formed in the outer arc face in the circumferential direction and are opposite to the centers of the four tile blocks respectively. A notch of the radial groove is connected with a cover plate, is internally provided with a piezoelectric ceramic displacement amplification mechanism and is connected with the spherical support through a positioning pin; a piezoelectric ceramic stack is arranged between a left boss and a right boss of the mechanism and is pre-tightened by a pre-tightening bolt and an elastic gasket. According to the invention, the inverse piezoelectric effect of piezoelectric ceramics is utilized, a vibration and non-linear suppression method is provided, an advanced control algorithm is matched, the piezoelectric ceramics stack is electrified and contracted, a displacement amplification effect is generated through a displacement amplification mechanism, the tile gap is finely adjusted, and the high-performance requirement of modern rotating machinery is met.

According to the flexible sensor for synchronously detecting dynamic and static states and internal conditions of human muscles, dynamic and static force cooperative detection and ultrasonic detection are integrated, and by using the elastic piezoelectric body containing the conductive filler, when the sensor is subjected to compression or stretching deformation, the resistivity and capacitance change greatly. By utilizing the piezoelectric effect and inverse piezoelectric effect of the material, an ultrasonic sensor is compatible with a piezoelectric capacitance type integrated sensor. Flexible electrodes (such as silver nanowires and graphene) and biocompatibility packaging (such as PDMS) are adopted. A time division strategy is adopted, and dynamic and static pressure detection and ultrasonic detection are alternately executed. Based on the technical scheme of the invention, the requirement of realizing accurate monitoring of dynamic force and static force in a full frequency range by using a single flexible sensor is met; the volume and weight of the device are greatly reduced, so that the sensor has good flexibility and wearing comfort, is suitable for physiological monitoring, avoids signal crosstalk and ensures data accuracy.

The invention discloses a high-linearity dynamic and static pressure flexible sensor based on Gaussian height distribution. The high-linearity dynamic and static pressure flexible sensor comprises a packaging layer, an upper electrode layer, a piezoelectric layer, a common electrode layer, an insulating layer, a lower electrode layer and a substrate layer which are sequentially stacked from top to bottom, the piezoelectric layer comprises a plurality of PVDF micro-columns, the top ends of the PVDF micro-columns are fixedly connected with the upper electrode layer, the bottom ends of the PVDF micro-columns are provided with micro-electrode layers, and the height of the PVDF micro-columns is of a Gaussian distribution structure from the center to the periphery; the common electrode layer is provided with a plurality of micro-column through holes which are completely overlapped with the PVDF micro-columns; the output leads of the upper electrode layer and the common electrode layer output piezoelectric signals corresponding to dynamic pressure, and the output leads of the common electrode layer and the lower electrode layer output capacitance signals corresponding to static pressure. According to the invention, the dynamic pressure is measured by using the piezoelectricity of PVDF, synchronous measurement of static pressure is realized through a Gaussian distribution structure of a plurality of PVDF micro-columns, and high-sensitivity and high-linearity output of dynamic and static pressure measurement signals is realized.

The invention discloses an unpowered air purification device based on electrostatic adsorption and negative ion effects, and relates to the technical field of air purification, the unpowered air purification device comprises a ventilation pipeline, an electrostatic adsorption module, a particle capture net, a negative ion release module and the like, a wind scooper guides airflow to enter the electrostatic adsorption module, and a friction ball rubs with an electrode plate to enable the electrode plate to be electrified; particulate matters in the air are adsorbed, falling particulate matters are collected by a liquid collecting box, residual particulate matters are further intercepted by a particulate capturing net, the elastic design is convenient for shaking off and cleaning, and the negative ion release module accelerates the generation of negative ions and purifies the air by utilizing the solar thermal conversion and piezoelectric effect. Efficient air purification is achieved through a multi-stage purification structure, the functions of humidity adjustment, intelligent reminding and the like are achieved, the structure is simple, energy conservation and environment protection are achieved, the device can adapt to various scenes, and an innovative scheme is provided for solving the air pollution problem.

The invention discloses a plasma hydrodynamic cavitation aeration coupled piezoelectric catalysis organic wastewater treatment system and method. The system comprises a wastewater tank, a water pump, a Venturi tube hydrodynamic cavitator, a catalytic oxidation reactor, a piezoelectric particle separator, a piezoelectric catalytic particle bin, a low-temperature plasma generator and an air pump. By coupling piezoelectric catalysis, pressure pulsation mechanical energy generated by hydrodynamic cavitation is converted into chemical energy for driving the piezoelectric effect, on one hand, pollutants are directly oxidized, and on the other hand, plasma by-product H2O2 is efficiently converted into. OH with strong oxidizing property, so that cooperation with plasma advanced oxidation is formed, and the pollutant removal efficiency is improved. The pollutant degradation energy efficiency and the energy utilization rate of the system are greatly improved. Meanwhile, the system realizes efficient recovery and cyclic utilization of the magnetic piezoelectric catalytic particles through the magnetic separation type piezoelectric particle separator, so that secondary pollution of the catalyst is fundamentally avoided.

The utility model relates to the technical field of electronic components, and discloses a stacked piezoelectric ceramic electrode, which comprises an upper insulating layer and a lower insulating layer, a piezoelectric component is mounted in the upper insulating layer, an insulating layer is fixedly connected outside the upper insulating layer, a leading-out component is mounted outside the upper insulating layer, and a lead-out pin is fixedly connected outside the leading-out component. The exterior of the upper insulating layer is fixedly connected with a fixed plate; the piezoelectric assembly comprises a positive electrode layer, the positive electrode layer is fixedly connected to the interior of the upper insulating layer, the exterior of the positive electrode layer is fixedly connected with a piezoelectric ceramic material film, and the exterior of the piezoelectric ceramic material film is fixedly connected with a piezoelectric ceramic piece. According to the utility model, under the direct piezoelectric effect, the multi-layer structure piezoelectric ceramic piece, the piezoelectric ceramic material film and the plurality of piezoelectric dielectric layers can more efficiently convert external weak mechanical force into electric signals and generate obvious charge change, so that the electric charge is accurately detected, and the sensitivity of the sensor is greatly improved.

The invention discloses a focusing type acoustic streaming heat dissipation device facing a chip. The device belongs to the crossing field of ultrasonic technology and heat dissipation technology and is composed of a piezoelectric stack, an acoustic lens, a splitter plate, a base, a supporting rod, a copper electrode and the like. According to the device, geometric parameter configuration of the splitter plate, the piezoelectric stack and the acoustic lens is optimized, and a double-piezoelectric-plate stacked structure is adopted to enhance the ultrasonic resonance effect; high-frequency alternating voltage is applied to the copper electrodes at the two ends of the piezoelectric stack, high-frequency sound waves are excited through the inverse piezoelectric effect, and after the sound waves are focused through the sound lens, a gradient sound pressure field is formed in a cavity formed by the splitter plate and the piezoelectric stack; air molecules are driven to move directionally based on the acoustic streaming effect, so that air flow at an air inlet is accelerated by sound pressure to form high-flow-rate focusing jet flow at an air outlet, and targeted forced convection heat dissipation of a chip heat source is realized. According to the device, the ultrasonic technology and the heat dissipation technology are combined, the whole device is simple in structure, free of moving parts and low in noise, and various heat dissipation requirements can be met in an array mode.

The invention belongs to the field of biological medicine and material science, and particularly relates to an intelligent response type piezoelectric nanofiber dressing and a preparation method and application thereof. According to the preparation method, polyvinylidene fluoride-trifluoroethylene, a high polymer material and inorganic nanoparticles are blended and spun through an electrostatic spinning technology, and then a photo-thermal component coating is subjected to surface in-situ oxidation and self-polymerization, so that the composite fiber membrane is prepared. Under the stimulation of ultrasound (US) and near-infrared laser (Laser), the fiber membrane can cooperatively activate the piezoelectric effect and the photothermal effect, generate a dynamic electric field and local high temperature, realize multi-mode cooperative killing of bacteria (the antibacterial rate exceeds 99%), and simulate an endogenous electric field to promote cell migration and wound healing. The dressing has good mechanical properties (the Young modulus is 15-20 MPa), hydrophilicity (the contact angle is about 30 degrees), biocompatibility and stability, is suitable for treatment of chronic infected wounds such as diabetes mellitus and the like, and has the advantages of on-demand activation and intelligent response.

A sacroiliac (SI) joint implant assembly addresses SI joint dysfunction and degenerative sacroiliitis. The assembly includes a first implant body, a second implant body, and a piezoelectric layer positioned between them. The piezoelectric layer generates electrical charges when subjected to mechanical stress, stimulating bone growth and enhancing stability of the SI joint after surgery. The implant bodies may feature non-planar surfaces to distribute compressive and shear forces unevenly across the piezoelectric layer. The assembly can be secured using fasteners such as screws, pins, or brackets, and may include porous or fenestrated bodies made from materials like titanium or polymers. Some implant assemblies are designed for minimally invasive surgical procedures, with configurations that allow for precise placement using guide wires and imaging techniques. The assembly aims to stabilize the SI joint and promote bone fusion, leveraging the piezoelectric effect to improve the overall efficacy of the fusion procedure.

The invention discloses a utilization method of a waste carbon fiber reinforced resin-based composite material and a belt mortar type rubbing and grinding activation machine, and belongs to the field of waste recycling. Carrying out rubbing friction catalysis and ultrasonic piezoelectric catalytic activation on the waste carbon fiber reinforced resin-based composite material and the barium titanate turbid liquid by adopting a rubbing and grinding activation machine with a mortar, then spraying an activating agent solution, and continuously soaking, rubbing and activating to obtain the modified waste carbon fiber reinforced resin-based composite material. And carrying out variable-pressure gradient heating carbonization activation to prepare the activated carbon barium titanate composite adsorption catalyst. According to the method, barium titanate piezoelectricity and friction catalysis coupled mechanical rubbing are adopted to activate a carbon fiber reinforced resin-based composite material, the stability of the carbon fiber reinforced resin-based composite material is reduced, the difference between carbonization activation conditions and performance of resin and carbon fibers is reduced, carbonization is controlled by adopting pressure transformation and temperature combination, and the activated carbon barium titanate composite adsorption catalyst is obtained. The method can be used for treating heavy metal-containing organic wastewater, new pollutant wastewater and waste gas.

The invention relates to a clamping system, in particular to a low-stress flexible clamping system for an aluminum-based silicon carbide ultrathin reflector, which comprises an air floatation supporting part, a clamping part and a clamping part, the air floatation supporting part comprises an air bag, the air bag is arranged above a bottom plate, the air bag is U-shaped, and two U-shaped supporting sheets at the upper end of the air bag are opened after the air bag is inflated; the self-adaptive clamp is also in a U shape, when the air bag is opened, the self-adaptive clamp is pulled to be opened outwards, and when the high-temperature reflecting mirror is clamped, the self-adaptive clamp recovers to the original shape, and the reflecting mirror is clamped; after the air bag is inflated, the two U-shaped supporting sheets at the upper end of the air bag are opened, and the opening tension is enough to pull open the self-adaptive clamp in a martensite phase, so that the reflecting mirror can be conveniently placed in the clamping system; when the reflector is clamped, the micro-displacement compensation block begins to extend under the inverse piezoelectric effect, the thickness of the micro-displacement compensation block is reduced, the counter-acting force on the reflector is reduced, flexible clamping is achieved, the assembling stress of the reflector is reduced, surface precision loss is prevented, and therefore the flatness of the surface of the reflector is improved.

The invention discloses a composite silicon-based negative electrode modified by a piezoelectric effect. The composite silicon-based negative electrode comprises a copper foil current collector, a negative electrode active layer blade-coated on the surface of the copper foil current collector and an inorganic piezoelectric coating sprayed on the surface of the negative electrode active layer, the inorganic piezoelectric coating is formed by uniformly spraying a piezoelectric solution on the surface of the negative electrode active layer under a high-temperature condition and drying; the piezoelectric solution is formed by mixing a piezoelectric ceramic material, a garnet type material, a second binder and a second organic solvent; and the negative active layer is formed by mixing a silicon-based active material, a conductive agent, a first binder and a first organic solvent. The composite silicon-based negative electrode with a double-layer piezoelectric-conductive negative electrode structure is formed by combining a piezoelectric material with a garnet type material, so that the defect of poor conductivity of the piezoelectric material is overcome, collaborative optimization of a piezoelectric effect and a conductive network is also realized, and the comprehensive performance of the battery is remarkably improved.

The invention discloses a multi-mode tactile sensor based on cross-shaped array design, the sensor is provided with five sensing units which are arranged in a cross-shaped array form, and each sensing unit is composed of a stress loading layer, a piezoelectric sensing layer, an isolation layer, a piezoresistive sensing layer and an electrode layer. The area of a perceptible region of the sensor is increased due to array type distribution, and the spatial resolution of the sensor is improved. Wherein the piezoresistive sensing layer and the piezoelectric sensing layer respectively simulate the characteristics that an SA receptor in human skin senses low-frequency pressure and an FA receptor senses dynamic vibration. The piezoresistive sensing unit and the electrode unit form a planar resistance structure, so that the sensor is sensitive to the direction of a loading force, and the design can be used for representing the magnitude and direction of the loading force, thereby realizing three-dimensional static force detection. The piezoelectric sensing unit utilizes the direct piezoelectric effect of a PVDF piezoelectric film to realize tiny vibration detection and is used for representing high-frequency vibration when the piezoelectric sensing unit is in contact with an object.

The invention provides a novel composite tilting and folding rotor integrated mechanism and an aircraft, and belongs to the technical field of tilting rotor aircrafts. The mechanism and the aircraft are characterized in that the whole aircraft comprises a fuselage, an empennage, an undercarriage, two wings and two tilting rotor devices. The wings are located on the two sides of the fuselage, rotor wing tilting mechanisms at the tail ends of the wings are driven by hydraulic cylinders to achieve overall rotation, and modes can be switched in the take-off stage and the cruise stage. The folding function of the paddle is controlled by adopting a linear telescopic connecting rod mechanism driven by a hydraulic rod to realize two states of retraction and unfolding; a piezoelectric ceramic material and an energy storage device are embedded in the tilting mechanism, and current is generated by utilizing the piezoelectric effect when the unmanned aerial vehicle flutters, so that electric energy is recycled and supplied to the folding device; meanwhile, a PID control algorithm is adopted, so that the aircraft is good in stability and high in response speed during hovering and vertical take-off and landing; the reliability of the aircraft can be improved, the aerodynamic performance can be improved, and high flexibility and wide application prospects are achieved.

The invention discloses an intelligent interactive garden landscape piezoelectric photocatalytic water purification device which is based on a light-electricity-gas collaborative purification mechanism and intelligent energy regulation and control. Light energy is converted into electric energy through a solar cell module, and mechanical energy is converted into electric energy through a pressure induction power generation floor; the LED light source is driven to activate electron transition of the piezoelectric photocatalytic material, and hydroxyl radicals are generated to efficiently degrade pollutants; meanwhile, water flow mechanical energy excites a piezoelectric effect to form an auxiliary electric field, an aeration system is superposed to supply oxygen to enhance oxidation reaction, and multi-path synergistic decomposition of pollutants is achieved. The interaction system interacts with a user through an infrared sensor and a pressure sensing power generation floor, and an intelligent controller dynamically adjusts the light source intensity, the aeration frequency and the water flow circulation, so that the purification efficiency is ensured; and an integrated circulating system of solar energy supply, intelligent regulation and control, collaborative purification and ecological recycling is formed, and finally the target of water resource regeneration and scientific and ecological integration is achieved.

The invention discloses application of a piezoelectric-photocatalytic composite material in a spiral-flow type hydrogen production device, and belongs to the technical field of energy environments and materials. The preparation method comprises the following steps: growing a ZnO nanorod array on the surface of a designed porous material in situ through a hydrothermal method, and carrying out annealing treatment to obtain a composite structure with remarkable piezoelectric property; then the composite material is placed in a spiral-flow type hydrogen production device matched with the composite material, the piezoelectric effect of the piezoelectric-photocatalytic composite material can be improved under excitation of a high-speed rotating turbulent flow field, and meanwhile efficient gathering and separation of hydrogen are achieved through a central negative pressure area. Experimental verification shows that ZnO / NF particles show higher hydrogen evolution efficiency and stability under the action of dynamic shear force after the designed piezoelectric-photocatalytic composite material loaded ZnO particles are put into a cyclone. The test verifies that the piezoelectric-photocatalytic composite material prepared by the invention has the optimal hydrogen evolution rate at the rotating speed of 1000rpm.

The invention discloses a sensing unit structure of a piezoelectric-piezoresistive coupling type electric field sensor and application, the sensing unit structure comprises a substrate, the substrate is provided with a cantilever beam structure, a piezoelectric crystal block is bonded between the lower surface of the cantilever beam structure and the upper surface of the substrate, and the upper surface of the cantilever beam structure is provided with a Wheatstone full-bridge structure; when the piezoelectric crystal block is subjected to the action of an electric field, the piezoelectric crystal block deforms in the Z-axis direction under the action of an inverse piezoelectric effect, so that the cantilever beam structure deforms; in the Wheatstone full-bridge structure, the resistors arranged at the position with the maximum stress difference value are stressed to deform, the stress directions of the resistors are opposite, and the resistance values of the resistors are changed oppositely; compared with the sensing unit structures of electro-optical and mechanical electric field sensors commonly used at present, the sensing unit structure has the advantages of larger measuring range, smaller volume, lower power consumption and easiness in mass production.

The invention relates to the technical field of energy storage materials, and provides a composite solid polymer electrolyte membrane and a preparation method thereof.The composite solid polymer electrolyte membrane is prepared through the steps that a polymer matrix serves as a matrix, a polar solvent is adopted for dissolving to form a pure polymer solution, then lithium salt and nematic phase liquid crystal E7 are added, a chiral dopant can also be added, uniform printing slurry is formed, and the composite solid polymer electrolyte membrane is obtained through 3D printing. And carrying out hot pressing treatment to prepare the composite solid polymer electrolyte membrane. The electrolyte membrane prepared by the invention has a controllable porous structure, a high dielectric constant and excellent piezoelectricity and energy storage performance, complex structures such as a three-dimensional grid and a porous structure can be directly printed, and the thickness and shape of the membrane can be accurately controlled by adjusting parameters such as a printing path, a layer height and filling density; the method is very suitable for the requirements of rapid customization of product shapes and sizes in the fields of flexible electronics, wearable equipment and the like. The invention also provides an application of the composite solid polymer electrolyte membrane prepared by the method in an energy storage device.

The invention belongs to the technical field of functional materials and membrane separation, and discloses a modified MXene piezoelectric ion screening membrane and preparation and application thereof, and a preparation method comprises the following steps: S1, preparing a two-dimensional MXene nanosheet dispersion liquid; and S2, adding a polydentate ligand into the mixture for modification, carrying out vacuum filtration, carrying out spin coating or blade coating on a porous substrate, and carrying out vacuum drying to obtain the modified MXene membrane. According to the preparation method, a bionic strategy is combined with piezoelectric characteristics of a material, an MXene nanosheet is modified by polydentate ligand (such as DOTA, EDTA, PA or Cyclone) molecules, an anti-swelling sub-nano channel is constructed, a piezoelectric effect is activated by combining mechanical stimulation such as ultrasonic and stirring, a piezoelectric channel is formed, and the preparation method is applied to the field of membrane separation by utilizing electromigration and a staggered electric field mechanism. The technical problems of swelling, insufficient mechanical stability, lack of dynamic regulation and control capability and the like of a traditional membrane material can be effectively solved, and particularly, efficient selective screening of monovalent / divalent ions can be realized.

The invention discloses a piezoelectric photocatalytic nanofiber membrane as well as a preparation method and application thereof, three functional materials, namely Cd0. 3Zn0. 7S particles, TiO2 and CDs, are blended in a PVDF / PAN (Polyvinylidene Fluoride / Polyacrylonitrile) matrix through an electrostatic spinning technology to construct a nano composite structure with high specific surface area and high dispersity, and the photocatalytic nanofiber membrane with excellent photoelectric property and piezoelectric effect is prepared. On the basis, by means of an ultraviolet etching technology, the interface performance of the nanofiber membrane is optimized, the exposure degree of active sites is increased, the embedding rate of nanoparticles is reduced, the surface reactivity of the nanofiber membrane is further enhanced, and optimization of catalytic performance is achieved. The piezoelectric electro-catalysis nanofiber membrane provided by the invention is stable in structure, keeps relatively high hydrogen evolution efficiency in multiple cycles of cyclic photocatalysis experiments, and shows excellent reutilization performance and environmental adaptability.

The present invention belongs to the field of construction engineering technology, and discloses a green and energy-saving building curtain wall, comprising longitudinal beams and transverse beams arranged in a crisscross pattern, wherein the surfaces of the longitudinal beams and transverse beams are connected to longitudinal positioning columns and transverse positioning columns respectively through fixing mechanisms, wherein the longitudinal positioning columns and transverse positioning columns are arranged in a crisscross pattern to form a grid structure, and a locking mechanism is also provided at the connection between the longitudinal positioning columns and transverse positioning columns, wherein adjustment windows and curtain panels are evenly arranged inside the grid structure, and a piezoelectric mechanism is also provided inside the driving compartment inside the adjustment window. When the angle of the adjustment blade is adjusted by the driving motor, the piezoelectric mechanism provided at the connection between the transmission rod and the second bevel gear can generate electricity by itself through the piezoelectric effect, and the generated electrical energy is converted and stored in the battery through the functions of the full-bridge rectifier, filter capacitor, DC-DC converter, supercapacitor and charging management chip.

The invention discloses a core-shell structure piezoelectric nano-enzyme material and application thereof in oral care, which can generate active oxygen through piezoelectric effect under the action of mechanical stress to realize double effects of tooth whitening and antibiosis. The technology does not need external source energy input, avoids dependence of traditional photocatalysis and chemical bleaching technologies, and is simple and convenient to operate, green and safe. Through in-situ generation of cerium oxide on the surface, the material has dual enzyme activity, effectively balances the antibacterial effect and biological safety, and prevents excessive damage to enamel. In addition, the stability and catalytic efficiency of the material are remarkably improved in a complex oral environment, and the problem of failure of a traditional material is avoided. The technology can be widely applied to oral care products such as toothpaste, mouth wash and antibacterial gel, has remarkable industrialization potential and can bring innovation to the global oral care market.

The invention relates to the technical field of cross-medium communication, and discloses a cross-medium communication method, system and device based on a piezoelectric effect and a medium, and the system comprises a piezoelectric mechanical antenna which is used for generating ultrasonic waves through mechanical vibration and further converting the ultrasonic waves into electromagnetic radiation to realize cross-medium communication; the matching network is connected with the piezoelectric mechanical antenna and the ultrahigh-voltage driver and is used for optimizing the energy transmission efficiency between the driving circuit and the piezoelectric mechanical antenna; the power management circuit is used for providing multi-stage power supply voltage required by the system; the ultrahigh-voltage driver is used for converting the signal into a high-voltage driving signal and driving the piezoelectric mechanical antenna to work through the matching network; the controller is used for generating a modulation signal, coordinating the work of each module of the system and simultaneously receiving environment data of the peripheral sensor to dynamically adjust parameters; the peripheral sensor is used for collecting environment parameters and transmitting data to the controller, and self-adaptive adjustment of the system is achieved.

The invention discloses an application of a chiral polylactic acid piezoelectric material doped polyaniline composite friction film in degradation of organic pollutants. The application specifically comprises the following steps: adhering the chiral polylactic acid piezoelectric material doped polyaniline composite friction film to the bottom of a turntable, and adhering a friction bottom sheet to the bottom in a flat-bottom container; the organic pollutant solution is poured into the container, the rotating disc adhered with the friction film is placed in the container for equilibrium adsorption, and one side of the friction film faces upwards; the turntable is turned over to enable one side of the friction film to face downwards to form a friction pair with the friction bottom plate, and the turntable is started to rotate for friction catalysis to realize degradation of organic pollutants. The conductivity of polyaniline is combined with the piezoelectric and chiral characteristics of chiral polylactic acid, a flexible friction film is obtained through a solution casting method, the flexible friction film and a friction bottom form a friction pair, active free radicals are generated through the triboelectric effect, high-concentration organic pollutants are efficiently degraded, and environment-friendly and efficient pollutant degradation at normal temperature and pressure is achieved.

The invention discloses a device for converting mechanical energy into electric energy, relates to the technical field of energy collection, and aims to solve the problems of unbalanced voltage and current output characteristics and low energy recovery efficiency in the traditional single-mode energy capture technology. Mechanical vibration is converted into electric energy through the direct piezoelectric effect; an electromagnetic energy harvesting module is further arranged in the shell, and electricity is generated according to the electromagnetic induction principle; the frequency self-tuning mechanism is connected with the electromagnetic energy harvesting module and is used for adaptively adjusting the frequency response range of the electromagnetic energy harvesting module according to the vehicle speed and the road condition change; the energy collection circuit board is connected with the output end of the piezoelectric energy harvesting module and the output end of the electromagnetic energy harvesting module and used for converting collected alternating current into stable direct current. Through a piezoelectric and electromagnetic composite structure, collaborative improvement of output voltage and current is achieved, the frequency response range is widened through the frequency self-tuning mechanism, and self-adaptive efficient energy capture of broadband vibration is achieved.

The invention discloses an intelligent electric pole based on bionics, and relates to the technical field of power transmission and transformation facilities. The carbon fiber cloth strip spirally surrounds the electric pole main body and is provided with a through hole; the ends of the shape memory wires penetrate through the through holes of the adjacent carbon fiber cloth strips and are fixed; the strain sensing mechanism is arranged on the carbon fiber cloth strip and is a piezoelectric effect device; the energy storage module is electrically connected to the strain sensing mechanism; the data transmission module is electrically connected to the strain sensing mechanism and the energy storage module; the plurality of carbon fiber cloth strips are provided with joint lines which alternately bypass the front and back surfaces to be connected side by side, and each carbon fiber cloth strip is provided with a plurality of through holes which are arranged along the length direction of the carbon fiber cloth strip; the strain sensing mechanism comprises a plurality of piezoelectric effect elements. The anti-damage electric pole has the effects of improving the anti-damage capability of the electric pole in long-term use and reducing the reinforcing and repairing expenditure.

The invention discloses a preparation method and application of dual-network piezoelectric induction hydrogel with a piezoelectric effect, and the method comprises the following steps: taking ACG and GelMA as base materials, taking MBA as a cross-linking agent, cooperating with a photoinitiator, and carrying out free radical polymerization to form a precursor solution; and adding BTO nanoparticles, mixing, and curing to obtain the hydrogel. According to the hydrogel disclosed by the invention, the mechanical property and the structural stability of the material are remarkably enhanced through a double-network structure, and the defects that traditional hydrogel is prone to excessive deformation and insufficient in mechanical property are overcome; by introducing a functional component with piezoelectric property, the material can generate a stable electric signal under the action of external force, the local electrophysiological environment of a wound surface is improved, cell proliferation, migration and angiogenesis are promoted, and tissue repair is accelerated; the anti-infection function can be further achieved while electrical regulation and control are achieved, the limitation of a single drug loading or passive protection strategy is avoided, drug resistance and toxic and side effect risks are reduced, and the synergistic effect of antibiosis and regeneration is achieved.

A kind of in-situ monitoring device and method of suspended solids concentration based on piezoelectric effect, including spherical sensor, flow rate measuring unit, signal processing unit and power supply and data transmission unit.Spherical sensor built-in piezoelectric ceramic sheet, its impact surface is directly exposed to water flow, protected by sealed shell;Flow rate measuring unit synchronously acquires real-time flow rate by external speed measuring device, and with piezoelectric ceramic sheet is kept within the preset interval.Signal processing unit processes the charge signal generated by piezoelectric ceramic sheet to obtain total electric signal, extracts the pure water flow reference signal corresponding to current flow rate based on pre-stored bivariate calibration database, deducts flow rate coupling component from total electric signal to calculate suspended solids exclusive signal, and then inverses concentration through function model.Power supply and data transmission unit supplies power, and transmits concentration data to external equipment through wired or wireless mode.The device solves the problems of traditional technology, such as complex operation, easy to be disturbed, etc., and is suitable for long-term in-situ monitoring of water body suspended solids concentration.