Journal
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
Volume 23, Issue 6, Pages 3531-3538Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TDEI.2016.005962
Keywords
Superhydrophobic; Aging; Self-healing; Silicone rubber; Surface free energy
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Silicone rubber is widely used for outdoor insulation because of its hydrophobicity. Meanwhile, superhydrophobic surfaces with self-cleaning property are ideal as outdoor insulating materials. An efficient technique to fabricate superhydrophobic silicone rubber with a contact angle of 151 and a sliding angle of 5 is reported. Long-term stability of polymeric superhydrophobic insulating surfaces was examined under electrical and non-electrical stresses. Results show that silicone rubber transforms from superhydrophobic to superhydrophilic after corona aging. Superhydrophobic characteristic is fully recovered through a self-healing process. After water immersion, it results in large contract angle hysteresis, although the static contact angle on the surface is large. The increase in surface free energy caused by aging for self-healing superhydrophobic material affects the stability of superhydrophobic properties. Once the hydrophobicity decreases and Wenzel contact mode is formed, the sliding angle and contact angle hysteresis are difficult to recover because of a large energy barrier between the Wenzel Cassie transitions.
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