Taw qhia ntawm electret
Tom qab hle lub tiaj hluav taws xob sab nraud lossis thov kev siv tshuab, qhov dielectric uas tuaj yeem tswj tau lub xeev polarization ntev ntev yog hu ua electret. Tus electret muaj ob qho tib si piezoelectric effect thiab pyroelectric effect. Hauv cov thev naus laus zis, cov hmoov av polar feem ntau yog siv los ua cov khoom siv electret. Tus electret tuaj yeem tsim qhov chaw hluav taws xob muaj zog ntawm 30 kV / cm. Electret' s muaj peev xwm khaws nqi tau siv hauv electrophotography thiab roj lim uas adsorb zoo rau hauv cov roj cua.