Abstract
Abstract
Corona-charged melt-blown polypropylene (MBPP) electret fabrics are promising candidates for air filtration, wearable sensing and energy harvesting applications. However, the underlying corona charging mechanism still needs further exploration to enhance the charge storage performance of electret fabrics. Herein, the phenomenon of surface electrostatic field polarity change in corona-charged MBPP electret fabrics is reported. By using negative corona charging and altering charging conditions such as sample size, charging time, charging voltage, discharge electrode shape and ground electrode contacting sample mode, three electrostatic field distribution modes can be formed on the two sides of samples, including (i) both front and back sides are negative; (ii) the front side is negative, and the back is positive; (iii) the front side is positive, and the back is negative. A corona charging mechanism based on plasma sheath is proposed as an explanation. The origin location and thickness of plasma sheath, which are affected by charging conditions, determine the electrostatic field polarity of MBPP fabrics. MBPP electrets with different electrostatic field polarities do not differ substantially in charge storage stability.
Subject
Surfaces, Coatings and Films,Acoustics and Ultrasonics,Condensed Matter Physics,Electronic, Optical and Magnetic Materials
Cited by
1 articles.
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