Transparent, Photothermal, and Icephobic Surfaces via Layer‐by‐Layer Assembly

Advanced Science

Shuwang Wu¹  Yupeng Li¹  Sarah Chay¹  Ximin He¹  Sicong Tan²  Jianjun Wang³  Zhenyu Liang³  Xinyuan Zhu⁴  Zhiyuan He⁵ 

[1] Department of Materials Science and Engineering University of California Los Angeles CA 90095 USA;Heat and Mass Transfer Center Institute of Engineering Thermophysics Chinese Academy of Sciences Beijing 100190 China;Key Laboratory of Green Printing Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China;School of Chemistry and Chemical Engineering State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 China;School of Materials Science and Engineering Beijing Institute of Technology Beijing 100081 China;

关键词: icephobic;    icing;    layer‐by‐layer;    photothermal;    transparency;   

DOI  :  10.1002/advs.202105986

来源: DOAJ

【 摘 要 】

Abstract Icing and frosting on transparent surfaces compromise visibility on various optical equipment and transparent infrastructures. It remains challenging to fabricate energy‐saving coatings for harvesting solar energy while maintaining high transparency. Here, transparent, photothermic, and icephobic composite surfaces composed of photothermal nanomaterials and polyelectrolytes via layer‐by‐layer assembly are designed and constructed. The positively‐charged polypyrrole nanoparticles and negatively‐charged poly(acrylic acid) are assembled as exemplary materials via electrostatic attractions. The optically transparent photothermal coatings are successfully fabricated and exhibited photothermal capabilities and light‐transmittance performance. Among the various coatings applied, the seven‐bilayer coating can increase the temperature by 35 °C under 1.9‐sun illumination, maintaining high transmittance (>60%) of visible light. With sunlight illumination at subzero temperatures (> −35 °C), the coatings show pronounced capabilities to inhibit freezing, melt accumulated frost, and decrease ice adhesion. Precisely, the icephobic surfaces remain free of frost at −35 °C as long as sunlight illumination is present; the accumulated frost melts rapidly within 300 s. The ice adhesion strength decreases to ≈0 kPa as the melted water acts as a lubricant. Furthermore, the negatively‐charged graphene oxide and positively‐charged poly(diallyldimethylammonium chloride) show their material diversity applicable in the coating fabrication.

【 授权许可】

Unknown