Cost‐Effective Fabrication of Micro‐Nanostructured Superhydrophobic Polyethylene/Graphene Foam with Self‐Floating, Optical Trapping, Acid‐/Alkali Resistance for Efficient Photothermal Deicing and Interfacial Evaporation. Issue 17 (20th March 2022)

• Record Type: Journal Article
• Authors: Xie, Heng; Xu, Wen‐Hua; Du, Yu; Gong, Jiang; Niu, Ran; Wu, Ting; Qu, Jin‐Ping
• Is Part Of: Small. Volume 18:Issue 17(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-03-20
• Subjects: micro‐nanostructures -- photothermal deicing -- polyethylene/graphene nanosheets (PE/GNs) foam -- solar evaporation -- superhydrophobicity; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.202200175
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: Solar evaporation is one of the most attractive and sustainable approaches to address worldwide freshwater scarcity. Unfortunately, it is still a crucial challenge that needs to be confronted when the solar evaporator faces harsh application environments. Herein, a promising polymer molding method that combines melt blending and compression molding, namely micro extrusion compression molding, is proposed for the cost‐effective fabrication of lightweight polyethylene/graphene nanosheets (PE/GNs) foam with interconnected vapor escape channels and surface micro‐nanostructures. A contact angle of 155 ± 2°, a rolling angle of 5 ± 1° and reflectance of ≈1.6% in the wavelength range of 300–2500 nm appears on the micro‐nanostructured PE/GNs foam surface. More interestingly, the micro‐nanostructured PE/GNs foam surface can maintain a robust superhydrophobic state under dynamic impacting, high temperature and acid‐/alkali solutions. These results mean that the micro‐nanostructured PE/GNs foam surface possesses self‐cleaning, anti‐icing and photothermal deicing properties at the same time. Importantly, the foam exhibits an evaporation rate of 1.83 kg m −2 h −1 under 1 Sun illumination and excellent salt rejecting performance when it is used as a self‐floating solar evaporator. The proposed method provides an ideal and industrialized approach for the mass production of solar evaporators suitable for practical application environments. Abstract : An efficient micro extrusion compression molding method is proposed for the cost‐effective fabrication of lightweight PE/GNs foam with interconnected vapor escape channels and surface micro‐nanostructures. The prepared foam possesses excellent anti‐icing and photothermal deicing properties, and exhibits an evaporation rate of 1.83 kg m −2 h −1 under 1 Sun illumination when it is used as a self‐floating solar evaporator.