6 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.

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.

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.