electret

(redirected from electrets)
Also found in: Dictionary, Encyclopedia.
Related to electrets: Electret effect

electret

[ilek′trət]
an insulator carrying a permanent charge similar to a permanent magnet.
References in periodicals archive ?
The sample so obtained is thus a stable electret, that is, a sample presenting a given amount of permanent orientational polarization [step (5)].
Electrets are used for making dust collecting filters (electric forces are widely used in air filtering), miniature microphones [4], micro-electro-mechanical microphone systems, motors and generators [5]-[8], organic transistors, regular and piezoelectric transducers, dosimeters, in an electro-acoustic transducers, biomedicine, electrostatic power-generators (proposed by Jefimenko and Tada), telecommunications, non destructive testing, medical imaging, automation, environment, advertising, safety, biological sciences etc.
Development of a new conditioning aerosol for testing electrets filters.
Electret filters are currently the most energy efficient air filters on the market (Choi, 2008) as their built-in additional electrostatic charge greatly improve the filtration efficiency, especially to capture small particles as shown in Figure 2.
In the recent years a lot of work has been published in the field of electrets effect in living and nonliving materials.
There are many such "polar" molecules in which the positive center of charge of the atomic nucleus does not coincide with the negative center of charge of the electron shell, due to their asymmetric structure, so that they possess an electrical dipole moment, and are tiny electrets.
MEMS work as well as electrets, but are smaller and cheaper to assemble.
Specific topics include the characterization of ferroelectric polymers; their use in application applications such as energy storing and harvesting and piezopolymer biosensors; conducting polymers and carbon nanotubes; electrochemical transistors as chemical sensors; and the combination of charge electrets and organic semiconductors for creating memory devices, inverters, and logic circuits.
Filtrete[TM], the media used, is comprised of permanent electrets that trap viruses and bacteria to prevent contamination.
Electrets are usually formed by a corona discharge generated by applying a high voltage to a fiber sheet.
Enhancements of Face Mask Respirators and Other Filters by Electrostatic & Antimicrobial Treatments: Larry Wadsworth, University of Tennessee--Examines new filters for personal protection, which combine the advantages of electrets with new technology for killing airborne microbes--regardless if the wearer is inhaling or exhaling.