audio: Piezoelectricity

Evidence: 100 • authority: 72

Lead zirconate titanate, also called lead zirconium titanate and commonly abbreviated as PZT, is an inorganic compound with the chemical formula Pb[ZrxTi1−x]O3 (0 ≤ x ≤ 1).. It is a ceramic perovskite material that shows a marked piezoelectric effect, meaning that the material accumulates an electric charge in response to mechanical stress. The piezoelectric effect is a reversible process: materials exhibiting the piezoelectric effect also exhibit the reverse piezoelectric effect, the internal generation of mechanical strain resulting from an applied electric field. It is used on in a number of practical applications such as ultrasonic transducers and piezoelectric resonators. It is a white…

Evidence: 100 • authority: 72

Piezoelectricity (, US: ) is the electric charge that accumulates in certain solid materials—such as crystals, certain ceramics, and biological matter such as bone, DNA, and various proteins—in response to applied mechanical stress. The piezoelectric effect results from the linear electromechanical interaction between the mechanical and electrical states in crystalline materials with no inversion symmetry. The piezoelectric effect is a reversible process: materials exhibiting the piezoelectric effect also exhibit the reverse piezoelectric effect, the internal generation of a mechanical strain resulting from an applied electric field. For example, lead zirconate titanate crystals will genera…

Evidence: 73 • authority: 72

In physics and materials science, ferroelectricity is the property of certain materials that exhibit a spontaneous electric polarization—an internal electric alignment that arises naturally without an external source. This polarization can be reversed when an external electric field is applied. All ferroelectric materials are also piezoelectric (they generate an electric charge when mechanically stressed) and pyroelectric (they generate a charge when heated or cooled). Their distinctive feature is that the natural electrical polarization is reversible. The term ferroelectricity was coined in analogy to ferromagnetism, where a material exhibits a permanent magnetic moment. Ferromagnetism was…

Evidence: 61 • authority: 92

Material-architecture-manufacture integrated strategy for piezoelectric metamaterials with mechanical protection and self-powered sensing.. The increasingly complex tasks of intelligent equipment have shifted the demand for structural materials from mere lightweight protection to multifunction integration, i.e., high recoverable energy absorption and accurate monitoring. Herein, we presented a material-architecture-manufacture integrated strategy for piezoelectric metamaterials to simultaneously achieve mechanical protection and self-powered sensing. Specifically, an intercalation heterostructure of silane-modified barium titanate (K-BTO)/MXene was constructed to improve the interfacial pol…

Evidence: 56 • authority: 92

Bulk ferroelectric heterostructures.. Interfaces in oxide heterostructures act as critical regions to induce emergent and novel types of functionality in thin films. Herein, we demonstrate the creation of bulk ferroelectric heterostructures (BFHs) in monolithic ferroelectrics by nanoscale elemental partitioning, unlocking functionalities beyond the reach of conventional ferroelectrics and thin-film devices. The unique percolating, compositionally modulated networks act as built-in heterointerfaces that generate coupled ferroelectric-electrostatic-elastic fields, which stabilize charged domain walls and imprint predefined domain configurations throughout the bulk. In exemplar BiFeO 3 -BaTiO…

Evidence: 49 • authority: 92

Self-Driven Drug Release Dual-Layer Dressing Composed of Electrospun Membrane and Hydrogel with Dynamic Structure Based on Piezoelectricity Transformation and Electrical Responsiveness.. This study reports the development of an intelligent dual-layer wound dressing engineered to achieve active wound repair. The self-standing dressing integrates a polyvinylidene fluoride (PVDF) piezoelectric electrospun membrane with a multifunctional hydrogel based on interfacial fusion. The PVDF layer converted mechanical energy derived from human body movement into electrical stimulation, which dramatically motivated the controlled release of diclofenac sodium (DFs) encapsulated in the hydrogel. The relat…

Evidence: 48 • authority: 92

Self-assembly of polyvinylidene fluoride (PVDF) and carbon nanotubes into flexible piezoelectric nanofiber transducers.. We report a scalable fabrication strategy for flexible piezoelectric nanofiber transducers through a single-nozzle, self-assembling electrospinning process. Unlike traditional coaxial methods, this approach exploits the surface energy differential between polyvinylidene fluoride (PVDF) and multi-walled carbon nanotubes (MWCNTs) to drive the spontaneous formation of a core-shell architecture. The resulting 80 nm diameter fibers feature a predominantly crystalline β-phase PVDF shell, with molecular chains oriented along the [001] fibers axis, encapsulating a perfectly align…

Evidence: 37 • authority: 92

Dynamically Tunable Exciton-Photon Coupling via Multi-Physics Field in Transition Metal Dichalcogenide Microcavities.. Atomically thin transition-metal dichalcogenides (TMDs) host tightly bound excitons with large oscillator strengths, making them ideal for studying light-matter interactions and polaritonic devices. When integrated with optical microcavities, TMD monolayers and van der Waals heterostructures enable engineering of the local density of optical states (LDOS), giving rise to Purcell-enhanced emission in the weak coupling regime and exciton-polaritons in the strong coupling regime. Practical polariton devices require dynamic, reversible control of exciton-photon detuning and cou…

Evidence: 37 • authority: 72

Energy harvesting (EH) – also known as power harvesting, energy scavenging, or ambient power – is the process by which energy is derived from external sources (e.g., solar power, thermal energy, wind energy, salinity gradients, and kinetic energy, also known as ambient energy), then stored for use by small, wireless autonomous devices, like those used in wearable electronics, condition monitoring, and wireless sensor networks. Energy harvesters usually provide a very small amount of power for low-energy electronics. While the input fuel to some large-scale energy generation costs resources (oil, coal, etc.), the energy source for energy harvesters is present as ambient background. For examp…