Ferroelectrics

Bain, A. K.; Chand, Pooran

doi:10.1002/9783527805310

Cited by 47 publications

(15 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Polarization is the relation between molecular properties and its charges when subjected to the influence of an electric field [ 27 ]. The main polarization processes from the higher frequency process up to the lowest frequency process are: atomic or electronic polarization, ionic polarization, dipole or orientation polarization, and space charge polarization [ 28 ]. In the electronic polarization, the electric field displaces the electron density of the atom, and in ionic polarization the displacement is of ions.…”

Section: Electrical Characteristics Of Materialsmentioning

confidence: 99%

A Review on Electrical Impedance Tomography Spectroscopy

Leitzke

Zangl

2020

Sensors

View full text Add to dashboard Cite

Electrical Impedance Tomography Spectroscopy (EITS) enables the reconstruction of material distributions inside an object based on the frequency-dependent characteristics of different substances. In this paper, we present a review of EITS focusing on physical principles of the technology, sensor geometries, existing measurement systems, reconstruction algorithms, and image representation methods. In addition, a novel imaging method is proposed which could fill some of the gaps found in the literature. As an example of an application, EITS of ice and water mixtures is used.

show abstract

Section: Electrical Characteristics Of Materialsmentioning

confidence: 99%

A Review on Electrical Impedance Tomography Spectroscopy

Leitzke

Zangl

2020

Sensors

View full text Add to dashboard Cite

show abstract

“…On the other hand, for a polar molecule generating a permanent dipole, positive and negative charges do not coincide with each other, and it is randomly oriented. According to Figure b, polar molecules undergo orientational polarization in the direction of the electric field . Therefore, the polar and nonpolar particles adhere on the electroadhesive device with electrostatic forces by the interfacial (induced) polarization of molecules.…”

Section: Resultsmentioning

confidence: 99%

Capturing Polar and Nonpolar Particles with an Electroadhesive Device Using Interfacial and Orientational Polarization

Choi

Chung

Park

et al. 2021

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

Many air filtration technologies have been used to solve the environmental issues of fine and ultrafine dust particles, which have been raised over the past decades. Many other filtration technologies have been developed, while highefficiency particulate arrestance (HEPA) is widely used recently due to its high efficiency. However, the HEPA filter has some limitations, such as high pressure drop, nonrecyclability, and most importantly, short lifetime. Regarding other types of air filters, electrostatic filters require a two-stage process (i.e., charging and polarization) of particles before filtration, whereas electroadhesion air filters could capture both polar and nonpolar particles without a two-stage process. The dust-holding capacity allows the quantitative analysis of the areal adhesion amount to be conducted. In this study, three different kinds of particles of fine dust, microcrystalline cellulose, and Teflon were tested. A model equation of the areal adhesion amount was also developed as a function of boundary edge length, voltage, and the dielectric constant of each material and allowed the areal adhesion amount of fine dust particles to be maximized, which is well above those of the HEPA filter and electrostatic filter. The optical images clearly showed that the dielectric polarization of polar particles was stronger than that of nonpolar particles.

show abstract

“…The POSFET exploits the organic ferroelectric copolymer PVDF-TrFE in the gate stack. Because ferroelectric materials are piezoelectric, the POSFET is a stress sensitive device, too 36,37 . Via the piezoelectric effect, stress induced interfacial charges modulate the channel current of the transistor.…”

Section: A Spiking and Adapting Tactile Sensor For Neuromorphic Applimentioning

confidence: 99%

A spiking and adapting tactile sensor for neuromorphic applications

Birkoben

Winterfeld

Fichtner

et al. 2020

Sci Rep

View full text Add to dashboard Cite

The ongoing research on and development of increasingly intelligent artificial systems propels the need for bio inspired pressure sensitive spiking circuits. Here we present an adapting and spiking tactile sensor, based on a neuronal model and a piezoelectric field-effect transistor (PiezoFET). The piezoelectric sensor device consists of a metal-oxide semiconductor field-effect transistor comprising a piezoelectric aluminium-scandium-nitride (AlxSc1−xN) layer inside of the gate stack. The so augmented device is sensitive to mechanical stress. In combination with an analogue circuit, this sensor unit is capable of encoding the mechanical quantity into a series of spikes with an ongoing adaptation of the output frequency. This allows for a broad application in the context of robotic and neuromorphic systems, since it enables said systems to receive information from the surrounding environment and provide encoded spike trains for neuromorphic hardware. We present numerical and experimental results on this spiking and adapting tactile sensor.

show abstract

Ferroelectrics

Cited by 47 publications

References 0 publications

A Review on Electrical Impedance Tomography Spectroscopy

A Review on Electrical Impedance Tomography Spectroscopy

Capturing Polar and Nonpolar Particles with an Electroadhesive Device Using Interfacial and Orientational Polarization

A spiking and adapting tactile sensor for neuromorphic applications

Contact Info

Product

Resources

About