The Discovery of the Piezoelectric Effect

Katzir, Shaul

doi:10.1007/s00407-002-0059-5

Cited by 78 publications

(48 citation statements)

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“…On the basic principle of piezoelectrochemical effect, the piezoelectricity originating from non‐central symmetry is a major requisite for redox reaction. [ 20 ] It is considered that a large amount of positive and negative charges will be generated by the microscopic pressures under the US irradiation, resulting in the establishment of a strong built‐in electric field due to piezoelectricity of the noncentrosymmetric T‐BTO nanoparticle, which will efficiently catalyze the ROS generation by piezoelectrically separated electrons and holes on the opposite sides of the nanoparticles (Figure 2d). The exact oxidative species generated to degradate dye in the piezocatalysis were verified by an electron spin resonance (ESR) technique.…”

Section: Figurementioning

confidence: 99%

Piezocatalytic Tumor Therapy by Ultrasound‐Triggered and BaTiO₃‐Mediated Piezoelectricity

2020

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Ultrasound theranostics features non‐invasiveness, minor energy attenuation, and high tissue‐penetrating capability, and is playing ever‐important roles in the diagnosis and therapy of diseases in clinics. Herein, ultrasound is employed as a microscopic pressure resource to generate reactive oxygen species (ROS) for piezocatalytic tumor therapy under catalytic mediation by piezoelectric tetragonal BaTiO3 (T‐BTO). Under the ultrasonic vibration, the electrons and holes are unpaired and they are separated by the piezoelectricity, resulting in the establishment of a strong built‐in electric field, which subsequently catalyzes the generation of ROS such as toxic hydroxyl (•OH) and superoxide radicals (•O2−) in situ for tumor eradication. This modality shows intriguing advantages over typical sonoluminescence‐activated sonodynamic therapy, such as more stable sensitizers and dynamical control of redox reaction outcomes. Furthermore, according to the finite element modeling simulation, the built‐in electric field is capable of modulating the band alignment to make the toxic ROS generation energetically favorable. Both detailed in vitro cellular level evaluation and in vivo tumor xenograft assessment have demonstrated that an injectable T‐BTO‐nanoparticles‐embedded thermosensitive hydrogel will substantially induce ultrasound irradiation‐triggered cytotoxicity and piezocatalytic tumor eradication, accompanied by high therapeutic biosafety in vivo.

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Section: Figurementioning

confidence: 99%

Piezocatalytic Tumor Therapy by Ultrasound‐Triggered and BaTiO₃‐Mediated Piezoelectricity

2020

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“…908 D. LEGNER, S. KLINKEL AND W. WAGNER For the position vector of each point of the shell, for the reference configuration, and the current configuration at time t , it holds O X. 1…”

Section: Mechanical Partmentioning

confidence: 99%

An advanced finite element formulation for piezoelectric shell structures

Legner

Klinkel

Wagner

2013

Numerical Meth Engineering

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SUMMARYPiezoelectric materials are increasingly employed throughout the field of sensor and actuator applications. The physical description leads to a boundary value problem with electromechanically coupled differential equations that can be solved approximatively, for example, by the FEM. As the structures usually are quite thin, piezoelectric shell elements are very well suited for this task. In piezoelectric materials, the mechanical and the electrical fields are coupled by the constitutive relations. Especially for problems dominated by bending, this results in incompatibilities when using element formulations where the mechanical and the electrical DOFs are interpolated with lowest order functions. As a consequence, parasitic approximations and incorrect computation results occur. The present work proposes a concept to avoid these incompatible approximation spaces and the occurring computation errors when dealing with thin structures. The element is based on a mixed variational formulation and uses six mechanical and two electrical nodal DOFs. It employs the Reissner–Mindlin kinematics, considers strains throughout the thickness, and allows for 3D‐electromechanical constitutive relations. Numerical examples show that the element formulation is electromechanically consistent and enables to analyze piezoelectric shell structures without parasitic approximations for all typical load cases. Copyright © 2013 John Wiley & Sons, Ltd.

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“…According to a popular definition by Jaffe [ 2 ], piezoelectricity denotes two physical effects that exist in certain materials, namely “the generation of electric charge in a substance by a mechanical stress that changes its shape, and a proportional change in the shape of a substance when voltage is applied.” A comprehensive historical exposition on the discovery of the above two piezoelectric effects was presented by Katzir [ 3 ]. Around 1880, the brothers Curie discovered the first effect, which is called the direct piezoelectric effect, to exist in certain crystals, e.g., in quartz.…”

Section: An Introductory Review On Piezoelectric Sensing and Actuatiomentioning

confidence: 99%

“…Concerning modern technological applications of piezoelectricity, Katzir [ 3 ] notes: “Though almost unknown outside the professional community, piezoelectric devices are today ubiquitous. Virtually everyone in the West posses at least one device based on piezoelectric technology.” The topic of the present paper belongs to a group of highly promising applications, namely the controlled sensing and actuation of the deformation and motion of mechanical systems.…”

Section: An Introductory Review On Piezoelectric Sensing and Actuatiomentioning

confidence: 99%

On the Use of Piezoelectric Sensors in Structural Mechanics: Some Novel Strategies

Irschik

Krommer

Vetyukov

2010

Sensors

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In the present paper, a review on piezoelectric sensing of mechanical deformations and vibrations of so-called smart or intelligent structures is given. After a short introduction into piezoelectric sensing and actuation of such controlled structures, we pay special emphasis on the description of some own work, which has been performed at the Institute of Technical Mechanics of the Johannes Kepler University of Linz (JKU) in the last years. Among other aspects, this work has been motivated by the fact that collocated control of smart structures requires a sensor output that is work-conjugated to the input by the actuator. This fact in turn brings into the play the more general question of how to measure mechanically meaningful structural quantities, such as displacements, slopes, or other quantities, which form the work-conjugated quantities of the actuation, by means piezoelectric sensors. At least in the range of small strains, there is confidence that distributed piezoelectric sensors or sensor patches in smart structures do measure weighted integrals over their domain. Therefore, there is a need of distributing or shaping the sensor activity in order to be able to re-interpret the sensor signals in the desired mechanical sense. We sketch a general strategy that is based on a special application of work principles, more generally on displacement virials. We also review our work in the past on bringing this concept to application in smart structures, such as beams, rods and plates.

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The Discovery of the Piezoelectric Effect

Cited by 78 publications

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Piezocatalytic Tumor Therapy by Ultrasound‐Triggered and BaTiO₃‐Mediated Piezoelectricity

Piezocatalytic Tumor Therapy by Ultrasound‐Triggered and BaTiO₃‐Mediated Piezoelectricity

An advanced finite element formulation for piezoelectric shell structures

On the Use of Piezoelectric Sensors in Structural Mechanics: Some Novel Strategies

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The Discovery of the Piezoelectric Effect

Cited by 78 publications

References 0 publications

Piezocatalytic Tumor Therapy by Ultrasound‐Triggered and BaTiO3‐Mediated Piezoelectricity

Piezocatalytic Tumor Therapy by Ultrasound‐Triggered and BaTiO3‐Mediated Piezoelectricity

An advanced finite element formulation for piezoelectric shell structures

On the Use of Piezoelectric Sensors in Structural Mechanics: Some Novel Strategies

Contact Info

Product

Resources

About

Piezocatalytic Tumor Therapy by Ultrasound‐Triggered and BaTiO₃‐Mediated Piezoelectricity

Piezocatalytic Tumor Therapy by Ultrasound‐Triggered and BaTiO₃‐Mediated Piezoelectricity