8 results about "Piezoelectric polymer" patented technology

This invention discloses a method for preparing a flexible film for treating infected bone defects, belonging to the fields of composite materials, piezoelectric materials, and electrospinning technology. The flexible film of this invention is a poly-L-lactic acid (PLLA) / black phosphorus nanosheets (BPNSs) composite film. PLLA is used as the substrate, and two-dimensional layered semiconductors with piezoelectric effect, BPNSs, are used as fillers. The composite film is prepared by electrospinning. The composite film has an asymmetric micro-interface, forming a structure in which PLLA fibers encapsulate BPNSs. BPNSs are in situ confined and coated within PLLA spinning fibers to construct a two-dimensional narrow bandgap semiconductor / flexible piezoelectric polymer composite film.

The application discloses a repairing product containing biodegradable piezoelectric nanofiber membranes and a preparation method and application thereof. The preparation process is simple, and raw materials are low in price. Compared with pure fiber membranes without doped nanoparticles, piezoelectric polymers in the fiber membranes doped with nanoparticles synergistically promote osteogenesis, and still have biodegradability, meet mechanical performance, and do not affect the piezoelectric performance of the nanofiber membranes.

This invention relates to a single-layer multifunctional decoupled hydrogel-based sensor and its fabrication method, belonging to the field of hydrogel sensor technology. The fabrication method includes: dissolving a hydrogel matrix in a solvent and stirring until homogeneous to obtain mixture one; adding a piezoelectric polymer to mixture one and heating and stirring until completely dissolved to obtain mixture two; subjecting mixture two to freeze-thaw cycles to obtain a hydrogel; and immersing the hydrogel in a redox ion pair solution for at least 24 hours to obtain a single-layer multifunctional decoupled hydrogel-based sensor. This invention overcomes the shortcomings of cumbersome fabrication processes and insufficient mechanical stability, achieving simultaneous high-sensitivity sensing of pressure, temperature, and strain signals with a single-layer thin-film structure and completing effective functional decoupling. Furthermore, the sensor possesses the characteristics of simple fabrication, low cost, excellent flexibility, and high stability, making it suitable for practical applications in wearable electronics, electronic skin, and other fields.

This invention discloses an anisotropic piezoelectric film for nerve repair and its preparation method, belonging to the field of biomedical materials technology. The anisotropic piezoelectric film for nerve repair provided by this invention has a surface with parallel, periodically repeating wavy folds; the wavelength of the wavy folds is 30-50 μm, and the height difference between the peaks and troughs is 10-30 μm; the anisotropic piezoelectric film is an organic piezoelectric polymer film with a thickness of 5-100 μm. The anisotropic piezoelectric film for nerve repair provided by this invention has a regular structure and high orderliness and anisotropy, which can accurately simulate the parallel arrangement of nerve fiber bundles in vivo, exhibiting excellent biomimetic effects. This facilitates the bridging growth of new axons along the injured vertebral segment, avoiding disordered axonal growth.

The application provides an ultrasonic transducer, a preparation method thereof and an electronic device. The preparation method of the ultrasonic transducer comprises the following steps: coating a piezoelectric polymer solution on a first electrode, drying under the condition that the relative humidity is less than 30%, and forming a piezoelectric film; sequentially performing crystallization and polarization on the piezoelectric film, and forming a piezoelectric layer; and forming a second electrode on the piezoelectric layer, so as to obtain the ultrasonic transducer. Through the preparation process, the transparency and piezoelectric constant of the formed piezoelectric layer can be improved, and the performance of the ultrasonic transducer is optimized.

The application relates to the technical field of sensors, in particular to a preparation method and application of a flexible fluorescent piezoelectric composite film with photo-tactile perception coupling, which comprises the following steps: first mixing CQDs and deionized water according to a preset first mass ratio to obtain a CQDs suspension; mixing a fluorine-containing piezoelectric polymer, a water-soluble pore-forming agent, a volatile auxiliary agent and N, N-dimethylformamide to obtain a pore-forming precursor mixed solution; depositing the pore-forming precursor mixed solution on a conductive surface of an electrode and performing first heat treatment to obtain a pore-forming agent dense film; and placing the pore-forming agent dense film into the CQDs suspension to perform immersion treatment and obtain a flexible fluorescent piezoelectric composite film. The porous structure is shaped to support the dispersion implantation of single quantum state CQDs, so that the composite film and the device thereof are endowed with fluorescent light perception function; the beta piezoelectric phase in the fluorine-containing piezoelectric polymer is formed through synchronous polarization induction, so that the composite film and the device thereof are endowed with high sensitivity.

This invention relates to a nanofiber acousto-electric device with adjustable response bandwidth, comprising two plastic film electrodes and a piezoelectric polymer nanofiber film sandwiched between the two plastic film electrodes; each plastic film electrode has several through-hole slits arranged in the middle, and the piezoelectric polymer nanofiber film exposed through the slits vibrates and deforms under the action of sound waves, thereby generating electrical energy; the nanofibers in the piezoelectric polymer nanofiber film are in an oriented and / or randomly oriented stacked structure; a metal layer is provided on one side of each plastic film electrode for collecting electrical energy; the metal layer contacts the piezoelectric polymer nanofiber film to form an acousto-electric generator. The advantage of this invention is that by adjusting the arrangement of the oriented fibers and the slits, the bandwidth of the device can be adjusted, thereby improving the utilization rate of sound and generating greater electrical energy.

The application provides a kind of all-solid-state battery negative electrode sheet, all-solid-state battery and preparation method, it is related to battery technical field.The all-solid-state battery negative electrode sheet introduces specific kind of inorganic substance ferroelectric I with piezoelectric effect and high viscoelastic piezoelectric polymer I with piezoelectric effect, uses system own expansion stress, inorganic substance ferroelectric I and piezoelectric polymer I are forced to polarize spontaneously under the condition of external voltage and generate electric field, it is favorable to accelerate the interface and lithium sub migration inside negative electrode, piezoelectric polymer I acts as binder and ion transport carrier, adapts to material intrinsic volume change.The application also provides an all-solid-state battery, inorganic substance ferroelectric and piezoelectric polymer are introduced simultaneously in negative electrode sheet and solid electrolyte layer, the process is equivalent to increase periodic ion pump in the electrode sheet, so as to reduce the overall impedance of solid-state battery charging process, improve cycle life and rate performance.