About this Abstract |
Meeting |
MS&T24: Materials Science & Technology
|
Symposium
|
Energy Materials for Sustainable Development
|
Presentation Title |
Electret Behavior of Single Carbon Fiber |
Author(s) |
Satya Nagalla, Deborah D.L. Chung |
On-Site Speaker (Planned) |
Deborah D.L. Chung |
Abstract Scope |
An unpoled electrically conductive electret is an emerging low-power energy source that undergoes short-circuited discharge and subsequent open-circuited self-charge. This work provides the first report of a single-fiber electret (7-μm diameter). Compared to a 12,000-fiber tow, a single carbon fiber provides comparable electric field and volumetric power density, and faster discharge/charge, but much lower energy per discharge/charge cycle (due to the high resistance). The electret-based capacitance (different from the permittivity-based capacitance) is defined as the electret charge divided by the electret voltage. The discharge time constant is given by the product of the electret-based capacitance and the resistance. The fast discharge/charge for the single fiber compared to the tow is due to the low electret-based capacitance. For the single fiber, the charge is slower than the prior discharge, and is less prone to being complete. For the tow, the discharge and charge are similar in rate and tendency for completion. |