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Critical pressure asymmetry in the enclosed fluid diode

Panter, Jack R.; Gizaw, Yonas; Kusumaatmaja, Halim

Critical pressure asymmetry in the enclosed fluid diode Thumbnail


Jack R. Panter

Yonas Gizaw


Joint physically and chemically pattered surfaces can provide efficient and passive manipulation of fluid flow. The ability of many of these surfaces to allow only unidirectional flow mean they are often referred to as fluid diodes. Synthetic analogues of these are enabling technologies from sustainable water collection via fog harvesting, to improved wound dressings. One key fluid diode geometry features a pore sandwiched between two absorbent substrates, an important design for applications which require liquid capture while preventing back-flow. However, the enclosed pore is particularly challenging to design as an effective fluid diode, due to the need for both a low Laplace pressure for liquid entering the pore, and a high Laplace pressure to liquid leaving. Here, we calculate the Laplace pressure for fluid travelling in both directions on a range of conical pore designs with a chemical gradient. We show that this chemical gradient is in general required to achieve the largest critical pressure differences between incoming and outgoing liquids. Finally, we discuss the optimisation strategy to maximise this critical pressure asymmetry.


Panter, J. R., Gizaw, Y., & Kusumaatmaja, H. (2020). Critical pressure asymmetry in the enclosed fluid diode. Langmuir, 36(26), 7463-7473.

Journal Article Type Article
Online Publication Date Jun 16, 2020
Publication Date Jul 7, 2020
Deposit Date Jun 3, 2020
Publicly Available Date Jun 26, 2020
Journal Langmuir
Print ISSN 0743-7463
Electronic ISSN 1520-5827
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 36
Issue 26
Pages 7463-7473


Published Journal Article (Advance online version) (6.4 Mb)

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Copyright Statement
Advance online version This is an open access article published under a Creative Commons Attribution (CC-BY) License, which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.

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