12 results about "Piezoelectric potential" patented technology

This invention discloses a barium titanate composite cuprous oxide catalyst, its preparation method, and its application, belonging to the field of catalyst preparation technology. The preparation method of the barium titanate composite cuprous oxide catalyst includes: mixing BaTiO3 and Cu2O cubes at a mass ratio of 1:(0.1~0.4), adding them to an ethanol-water solution for composite formation, followed by filtration, washing, and vacuum drying. The composite catalyst is a heterostructure formed by BaTiO3 nanoparticles attached to the surface of Cu2O cubes. During the electrocatalytic reaction, simultaneous application of ultrasound results in a synergistic effect between the piezoelectric potential generated by BaTiO3 and the catalytic activity of Cu2O, which can efficiently promote nitrate adsorption activation and ammonia generation. Compared with existing technologies, this invention is the first to apply the piezoelectric-electrocatalytic synergistic mechanism to the field of electrocatalytic reduction of nitrogen-containing compounds, achieving an ammonia yield as high as 3370.38 μg·h⁻¹. ‑1 ·mg ‑1 With its excellent performance of 70.54% Faraday efficiency and simple, controllable, and low-cost preparation process, it provides a new route for the green synthesis of ammonia and has important industrial application prospects.

This invention provides an antibacterial and repair-promoting piezoelectric film, its preparation method, and its application, belonging to the field of piezoelectric material technology. The method involves in-situ self-assembly of Fe-MOF on the surface of BTO, followed by further loading with DHA to synthesize an electrically controlled drug-release, antibacterial, and repair-promoting nanocomposite, BTO / Fe-MOF / DHA. BTO / Fe-MOF / DHA is then added to the surface of semi-cured PDMS to form an antibacterial and repair-promoting piezoelectric film, PDMS-BTO / Fe-MOF / DHA. When the PDMS-BTO / Fe-MOF / DHA piezoelectric film is subjected to ultrasonic stimulation, BTO converts mechanical energy into electrical energy, releasing Fe from the Fe-MOF... 3+ Reduced to Fe 2+ Fe-MOF degrades and releases DHA, and ultimately, Fe... 2+ Reacting with synchronously released DHA, it produces a large amount of toxic ROS, which damages proteins and nucleic acids, inducing bacterial death. The antibacterial and repair-promoting piezoelectric membrane of the present invention generates a piezoelectric potential during mechanical deformation caused by animal movement and induces EF at the wound site to promote wound healing. This antibacterial and repair-promoting piezoelectric membrane shows great potential in the future treatment of bacterial infected wounds.

The application discloses a triboelectric-piezoelectric hetero synapse transistor and a preparation method thereof. The triboelectric-piezoelectric hetero synapse transistor comprises, from bottom to top, a flexible / stretchable substrate layer, a source-drain electrode layer, a semiconductor layer, a piezoelectric ionic gel layer and a dielectric triboelectric layer. By integrating a triboelectric nanogenerator, a piezoelectric ionic gel and a synapse transistor, the triboelectric potential generated in the approaching process of an external object is used to induce the formation of a double electric layer of anions and cations in the ionic gel, and the piezoelectric potential generated in the pressing process is used to promote the reverse migration of the anions and cations, so as to realize the dynamic regulation of the carrier transport characteristics in the semiconductor. The output of excitatory or inhibitory postsynaptic current is adjusted through the "contact-pressing" process of the external environment.

The invention discloses a secondary water supply water tank outlet water pressure electro-catalysis purification device which is connected between a water tank outlet pipe and a lifting pump front pipe in series. The device main body is alternately provided with purification areas and slow flow reaction areas along the water flow direction, and the slow flow reaction areas are positioned between adjacent purification areas; and at least three sets of piezoelectric potential energy purification devices consisting of piezoelectric potential energy nets and piezoelectric purification units are fixed in each purification area. The piezoelectric potential energy net is provided with a potential energy titanium net protruding in the water flow direction and a piezoelectric node ball net fixed to a node. The piezoelectric purification unit comprises lead-free piezoelectric ceramics which are embedded and fixed in the meshes and are in direct contact with the water flow, a pressure contact rod for transmitting the impact force of the water flow to the ceramics, and a dowel bar. Water flow impacts and excites the lead-free piezoelectric ceramic to generate piezoelectric catalytic reaction, hydroxyl free radicals and superoxide free radicals are generated, and disinfection by-products are degraded. The device utilizes water flow kinetic energy for self-energizing purification, is non-toxic and efficient, does not change pipeline pressure, and is suitable for a secondary water supply system of a high-rise building.

The application discloses a kind of pipe catalytic reaction operation systems based on piezoelectric potential regulation, specifically relates to the field of piezoelectric potential regulation pipe catalytic reaction operation, including starting matching module, path generation module, diffusion modeling module, passage regulation module, efficiency optimization module;Starting matching module is based on catalytic medium original preparation parameter and flow shear environment initial setting parameter, extracts catalytic medium structure parameter and shear environment characteristic parameter, and filters the adaptive data combination that meets the requirement of piezoelectric potential preliminary excitation.Through in the condition without additional energy, based on the dynamic adaptation of catalytic medium and flow shear environment, the piezoelectric potential response is excited using fluid shear force and water pressure fluctuation, continuously induces free radical generation and migration, forms pollutant degradation passage, to realize the stable and continuous operation of pipe catalytic reaction, to solve the problem of insufficient continuous processing capacity in the prior art by relying on external excitation.

The invention discloses a glass through hole high-speed etching method based on laser-induced piezoelectric nano domain and chemical potential cooperative driving, which comprises the following steps: performing scanning modification on a glass substrate by adopting infrared-ultraviolet dual-band laser, and forming an oxygen vacancy concentration gradient in a modified area through time sequence regulation and control and gradient increase of power density along the thickness direction, constructing a chemical potential difference along the axial direction of the through hole; the modified glass substrate is immersed in Fe / HO composite catalytic etching liquid, an ultrasonic field is applied, the driving phase of the ultrasonic field and a pulse packet sequence of laser scanning are kept locked, the oxygen vacancy concentration gradient area generates a piezoelectric nano domain under the action of periodic stress, and the oxygen vacancy concentration gradient area generates a piezoelectric nano domain; the potential of the piezoelectric nano domain drives the active particles in the etching liquid to directionally migrate and react; and monitoring and maintaining the oxidation-reduction activity of the etching liquid in real time, and realizing anisotropic etching by utilizing the synergistic effect of the chemical potential difference and the piezoelectric potential until a through hole is formed.

This invention relates to a green and efficient Bi 13 S 18 The preparation method and application of Br2 belong to the field of piezoelectric catalysis technology. The method involves adding a bismuth salt solution to a mixed solution of a sulfur source and a bromine source, stirring at 80℃~130℃ for 4 h~7 h to carry out a co-precipitation reaction, and filtering, washing, drying, and grinding the resulting black precipitate to obtain Bi2. 13 S 18 Br2; the application is as an antibacterial functional material in marine antifouling coatings. The method is green and efficient, and is simple, low-cost, uses readily available raw materials, and is easy to produce. The application is based on the principle of piezoelectric effect, Bi... 13 S 18 Br2 possesses an intrinsic asymmetry that results in an internal dipole moment, which can effectively utilize external mechanical energy such as ocean wave energy to generate an internal piezoelectric potential. This leads to a piezoelectric catalytic reaction that produces reactive oxygen species. These reactive oxygen species kill marine bacteria and other fouling microorganisms, ultimately achieving the goal of marine antifouling.

The invention relates to the technical field of biomedical detection, and discloses a sputum pretreatment method for rapidly carrying out nucleic acid detection, and the method comprises the following steps: directly adding a dry intelligent infinitesimal into sputum; applying a low-frequency rotating magnetic field to drive infinitesimal spiral implantation; switching a high-frequency magnetic field to realize in-situ liquefaction and nucleic acid release by utilizing mechanical vibration and piezoelectric potential; adsorbing nucleic acid based on an electrowetting effect, and separating and eluting through a gradient magnetic field; and carrying out isothermal amplification detection on the purified nucleic acid. The intelligent asymmetric magnetoelectric coupling infinitesimal element is used as an execution medium, multiple effects of external dynamic magnetic field frequency modulation, coupling mechanical shearing, acoustic streaming capture and electric field breakdown are matched, physical viscosity reduction of the sample and efficient extraction of nucleic acid are achieved under the condition of no exogenous liquefying agent, dilution-free pretreatment of the high-viscosity sample is achieved, and the detection accuracy is improved. The detection sensitivity of low-abundance pathogens can be improved, and the inhibition of chemical reagents can be avoided.

This invention discloses a bipolar transistor, its fabrication method, and a detection circuit, applicable to the field of transistor technology. Using a piezoelectric thin film as the n-type doped layer in the transistor, a bipolar transistor with an n-p-n structure is formed by two n-type piezoelectric layers sandwiching a p-type polymer. When any mechanical stress is applied to the top of the transistor, a charge is generated in the piezoelectric layer, polarizing the upper and lower surfaces of the piezoelectric layer, with opposite charges accumulating on different surfaces. Furthermore, due to the formation of two pn junctions, the passivation of free carriers amplifies the output signal, thereby enhancing the induced piezoelectric potential by applying pressure. This achieves a combination of sensing and energy harvesting functions in the bipolar transistor, allowing simultaneous energy harvesting during sensing operation without the need for external power supplies or signal amplification circuits.

This invention discloses a core-shell composite piezoelectric fiber material and its preparation method. The invention first prepares a core-shell composite nanofiber with PVDF-TrFE as the shell and PC as the core using a coaxial spinning process. Using PC as the core increases the elastic modulus of the composite piezoelectric fiber, resulting in a larger piezoelectric potential than pure PVDF-TrFE fibers under the same strain. Simultaneously, PC forms hydrogen bonds at the interface with PVDF-TrFE, increasing the crystallinity of the PVDF-TrFE shell and thus improving the piezoelectric properties. The core-shell composite piezoelectric fiber has a d... 33 The piezoelectric coefficient can reach 49.1 pC N. ‑1 It is 110% higher than that of pure PVDF-TrFE.

This invention provides a method for copper-catalyzed Goldberg amination reactions involving piezoelectric materials driven by ball milling, belonging to the field of organic synthesis technology. The mechanical force of ball milling induces the formation of a piezoelectric potential on the surface of the piezoelectric material, which participates in the regulation of the oxidation state of the copper salt catalyst and the catalytic cycle, thereby activating aryl halides and nitrogen-containing nucleophiles. The entire reactant mixture reacts in a ball mill to obtain target products such as N-arylamines or N-arylamides. This invention combines piezoelectric materials with a copper catalytic system, enabling efficient C-N bond construction in copper-catalyzed Goldberg amination reactions under mechanical ball milling conditions without external heating and with little or no solvent. Experiments show that the reaction hardly occurs without the participation of piezoelectric materials, confirming the irreplaceable nature of piezoelectric materials. The method of this invention is mild, environmentally friendly, simple to operate, and has broad substrate applicability, making it suitable for the green construction of the skeletons of N-arylamines or N-arylamides in pharmaceutical, pesticide, and functional material molecules.

The application discloses a long-acting lubrication-corrosion integrated coating based on a friction-induced piezoelectric effect and a preparation method, and solves the bottleneck problem that the existing bonded solid lubricating coating is accelerated to deteriorate in tribological performance under a salt spray corrosion environment and is insufficient in long-acting service life. The specific technical scheme is as follows: polyamide-imide (PAI) is used as a matrix to construct a polyamide-imide / polyvinylidene fluoride (PVDF) binary composite resin matrix, and barium titanate (BTO) piezoelectric nanoparticles and graphene which are surface-modified by a silane coupling agent are doped, and polytetrafluoroethylene (PTFE) microparticles are added. Through mechanical energy-electric energy conversion effect in a friction process, the BTO / PVDF composite phase generates a piezoelectric potential under the action of a contact stress, and a three-dimensional electric field network is formed in the coating, the electric field produces a directional repulsion effect on negative charged corrosion ions such as Cl⁻, and penetration of a corrosion medium is delayed.