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Download fileBiomimetic Multiwalled Carbon Nanotube/Polydimethylsiloxane Nanocomposites with Temperature-Controlled, Hydrophobic, and Icephobic Properties
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posted on 2021-09-29, 20:46 authored by Yongyang Sun, Yubo Wang, Xin Sui, Wenyan Liang, Liang He, Fangxin Wang, Bin YangRetarding and preventing
ice/frost formation
have increasing importance in aerospace applications because of widespread
energy and safety concerns. In this study, multiwalled carbon nanotube–polydimethylsiloxane
(MWCNT/PDMS) nanocomposites were fabricated via mechanical stirring
and three-roll grinding. By imitating the microstructures of lotus
leaves, various biomimetic nanocomposites were prepared by etching
micropillar arrays on MWCNT/PDMS nanocomposites. These biomimetic
nanocomposites possess superior flexibility, electrical conductivity,
hydrophobicity, and icephobicity. Effects of the micropillar height
on the wettability, freezing process of water droplets, ice/frost
formation, and ice adhesion strength were characterized; influences
of temperature on the wettability and strength of ice adhesion and
feasibility of electrothermal deicing were investigated. The surface
wettability, freezing process of water droplets, ice/frost formation,
and ice adhesion strength in the Cassie state are independent of the
micropillar height. However, compared to flat surfaces, the adhesion
strength of ice increases, and formation of ice/frost decreases because
of the presence of surface micropillars. At the same micropillar height,
an increase in temperature decreases the contact angle and ice adhesion
strength. The results indicate that the surface microstructure designability
and flexible temperature-controllability of biomimetic nanocomposites
have great potential for use in aerospace (anti-/deicing) applications.
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Keywords
icephobic properties retardingetching micropillar arraysanti -/ deicingsurface microstructure designabilityvarious biomimetic nanocompositesice adhesion strengthmicropillar heightelectrothermal deicingbiomimetic nanocompositessurface micropillarsice adhesionadhesion strengthwidespread energywater dropletssafety concernsroll grindingresults indicatepreventing icepolydimethylsiloxane nanocompositeslotus leavesincreasing importanceice increasesgreat potentialfrost decreasesfreezing processflat surfaceselectrical conductivitycontact anglecassie state