Biomimetic Coating-free Surfaces for Long-term Entrapment of Air Under Wetting Liquids

Overview

Journal Nat Commun

Specialty Biology

Date 2018 Sep 8

PMID 30190456

Citations 19

Authors

Eddy M Domingues

Sankara Arunachalam

Jamilya Nauruzbayeva

Himanshu Mishra

Affiliations

Soon will be listed here.

Abstract

Trapping air at the solid-liquid interface is a promising strategy for reducing frictional drag and desalting water, although it has thus far remained unachievable without perfluorinated coatings. Here, we report on biomimetic microtextures composed of doubly reentrant cavities (DRCs) and reentrant cavities (RCs) that can enable even intrinsically wetting materials to entrap air for long periods upon immersion in liquids. Using SiO/Si wafers as the model system, we demonstrate that while the air entrapped in simple cylindrical cavities immersed in hexadecane is lost after 0.2 s, the air entrapped in the DRCs remained intact even after 27 days (~10 s). To understand the factors and mechanisms underlying this ten-million-fold enhancement, we compared the behaviors of DRCs, RCs and simple cavities of circular and non-circular shapes on immersion in liquids of low and high vapor pressures through high-speed imaging, confocal microscopy, and pressure cells. Those results might advance the development of coating-free liquid repellent surfaces.

Citing Articles

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