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Icephobic surfaces have attracted increasing attention due to their wide ranging application areas from wind and solar energy systems to aviation. Slippery liquid-infused porous surfaces (SLIPS) are being explored for passive ice protection due to their lower ice adhesion strength.In this study, we present a cost-effective and scalable electrospinning technique to produce freestanding nanofibrous polymeric surfaces for the fabrication of transparent icephobic SLIPS. The diameter of the electrospun fibres produced varied from 200 to 400 nm and the membranes had a theoretical porosity of 71.6 ±4.1%. Furthermore, three different lubricants polychlorotrifluoroethylene oil (PcTFE), silicone oil and liquid paraffin, were used and it was observed that when silicone oil and PcTFE were used as lubricants for SLIPS, they provided high optical transparency (>90%) in the visible light spectrum compared to PVDF-co-HFP itself. All SLIPS were subjected to centrifugal ice adhesion testing which revealed their ice adhesion strengths lower than 1 KPa with significant delay in droplet icing compared to aluminium reference, from 5 up to 41 sec. The results indicated that enhanced icephobic properties of electrospun membranes have been clearly demonstrated.

No abstract

In this study, polyamide monofilament yarn of 3000 tex was coated with graphene oxide (GO) nanomaterial using dip-coating method. The graphene oxide layer was then reduced with green chemical reduction method, resulting in a reduced graphene oxide-coated monofilament yarn. The properties of the graphene oxide and reduced graphene oxide-coated polyamide monofilament yarns were characterized by performing physical, electrical, optical, and morphological investigations. The lowest sheet resistance was measured from seven-layer graphene-coated polyamide monofilament yarn as 3.09 kΩ/sq. Moreover, it was measured that 90° and 180° bent seven-layer graphene-coated polyamide monofilament yarns had 3.57 and 3.81 kΩ/sq sheet resistance, respectively. Additionally, while PA monofilament yarn has 73.5% transmittance at 550 nm; seven-layer GO and seven-layer graphene have 18.8 and 4.5%, respectively, as expected. On the other hand, the contact angle increased with the reduction of graphene oxide layer on monofilament yarn. The fabricated graphene-coated polyamide monofilament yarns can be used in electrotextiles, solar cells, sensors, and OLEDs as fiber-shaped flexible electrodes.