Penetration and stability of external electrostatic field of PP electret through rat skin

The polypropylene (PP) was corona charged using different grid voltage to prepare varies electrets with different polarities. The penetration and stability of the external electrostatic field of the PP electret through the excised fresh, stratum corneum (SC) stripped and dehydrated rat skin and the surface potential decay at the dermis side of the rat skin were investigated after application of different PP electrets onto the skin samples. The results indicated that the PP electrets could change the polarized state of the fresh and SC stripped skin. The change of the polarized state of the skin was closely related to the polarity and magnitude of the potential of the PP electret. The external electric field of the PP electret could penetrate through all skin samples and showed good stability as well. Besides, the electrostatic field of the PP electret could also form a stable potential difference between both sides of the SC to regulate the polarized state of the SC.