Regulation of Adhesion between Polymer Solid-Liquid Composite Interface and Liquid

As an emerging class of bioinspired materials, slippery liquid-infused porous surfaces (solid-liquid composite surface) inspired by Nepenthes pitcher plants, which are fabricated by the infusion of lubricating fluids into porous surfaces, have attracted extensive attention because of their great value in fundamental research and practical applications. Interface adhesion is one of the most important properties of polymer solid-liquid composite materials. Adhesion between solid and liquid can be seen everywhere in human life, agriculture and industry, such as oil-water separation, droplet manipulation, lab on the chip, high efficiency heat exchanger, and water collection. Hence, accurate regulation of interface adhesion plays a vital role in promoting the development and application of such materials. This paper mainly reviews adhesion regulation of polymer solid-liquid interface from three aspects: stability, directivity, and intelligence. The first aspect mainly focuses on improving anti-adhesive stability and mechanical stability of the polymer solid-liquid composite surface by introducing nanoscale layered structures and hetero-structures into surface microstructure. The second aspect summarizes directional adhesion of polymer solid-liquid composite interface, designed by combining the directional polymer surfaces and lubricants. The third aspect highlights intelligent regulation of interface adhesion, which was achieved by introducing smart response element into the polymer solid-liquid composite interface to realize reversible regulation of the adhesion between the interface and liquid under the external field. Finally, the existing problems of this field are summarized and their future development directions are forecasted.