Abstract
The ice-phobic and transparent surface based on the distinctive structure of a coating material has been investigated. Moth eye structure fabricated on the quartz substrate was covered with a flat paraffin layer to isolate it in a cold and humid environment. Paraffin wax was chosen as the coating material due to low thermal conductivity, easy coating, and original water repellency. The paraffin layer only stayed on the top of the nanostructure, separated it from the outside environment to obstruct heat energy being transferred to the cold substrate, and prevented the wetting transition, which was observed regularly on the rough surface. The uncountable number of air blocks trapped inside the nanostructure also contributed to delayed heat transfer, leading to an increase in the freezing time of the attached water droplet. The anti-icing performance was evaluated in terms of adhesion strength, freezing time, and freezing rain sustainability. The nanostructure coated sample was compared with barely coated and superhydrophobic nanostructure surface and demonstrated a preeminent performance.
Highlights
INTRODUCTIONIce accumulation on aircraft wings can reduce lifting force, block moving parts, and cause disastrous problems. Ice accretion on energy transmission systems, vehicles, and ships in a harsh environment often leads to massive destruction and contributes to serious accidents
Ice accumulation on aircraft wings can reduce lifting force, block moving parts, and cause disastrous problems.1,2 Ice accretion on energy transmission systems,3 vehicles, and ships in a harsh environment often leads to massive destruction and contributes to serious accidents.Many studies have been conducted over several decades to improve the anti-icing performance on functional surfaces and, in general, the improvement measures are often divided into active and passive approaches
While active approaches correspond to the ice removal via an external energy source,4–6 passive approaches refer to physicochemical methods7–9 based on the surface modification
Summary
Ice accumulation on aircraft wings can reduce lifting force, block moving parts, and cause disastrous problems. Ice accretion on energy transmission systems, vehicles, and ships in a harsh environment often leads to massive destruction and contributes to serious accidents. Among many reported passive approaches, the superhydrophobic surface (SHS) was believed to be the appropriate solution for anti-icing owing to its unique characteristics of water repellency (high contact angle and low sliding angle) and facile fabrication.. Biomimetic slippery liquid infused porous surfaces (SLIPs) have been introduced as an advanced anti-icing strategy.24–27 This new concept presents a defect-free liquid interface with the relevant properties such as water immiscibility, humidity tolerance, and self-healing after ice remova1.8,28–37 SLIPS can be fabricated through covering a porous structure with a low-surface-tension lubricant that is immiscible in water and has a high affinity with structured materials. The anti-icing properties of the unique nanostructure coated paraffin surfaces were evaluated in terms of adhesion strength, freezing time, and mimicking rain sustainability. The nanostructure coated sample exhibits high transparency and anti-reflective effects owing to the moth eye structure, indicating the potential designs for practical optical applications
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