Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 15, Issue 18, Pages 22684-22691Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.3c01454
Keywords
two-dimensional oleophilic surface; oleophobic barrier; unidirectional and long-distance oil transport; oil; water separation; oil-based chemical reaction
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This paper investigates the challenge of achieving unidirectional and long-distance oil transport in an aqueous environment and successfully fabricates an underwater superoleophilic two-dimensional surface (USTS) with asymmetric oleophobic barriers to arbitrarily manipulate oil in water. The behavior of oil on USTS is found to have unidirectional spreading capability originated from the anisotropic spreading resistance resulted from the asymmetric oleophobic barriers. Additionally, an underwater oil/water separation device has been developed to achieve continuous and efficient oil/water separation and prevent secondary pollution caused by oil volatilization.
Unidirectional and long-distance liquid transport is critically important to a range of practical applications, e.g., water harvesting, microfluidics, and chemical reactions. Great efforts have been made on liquid manipulation; most of which, however, are limited in the air environment. It is still a great challenge to achieve unidirectional and long-distance oil transport in an aqueous environment. Herein, we have successfully fabricated an underwater superoleophilic two-dimensional surface (USTS) with asymmetric oleophobic barriers to arbitrarily manipulate oil in aqueous medium. The behavior of oil on USTS was carefully investigated, of which the unidirectional spreading capability was originated from the anisotropic spreading resistance resulted from the asymmetric oleophobic barriers. Accordingly, an underwater oil/water separation device has been developed, which can achieve continuous and efficient oil/water separation and further prevent the secondary pollution caused by oil volatilization.
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