Sharkskin-mimetic desalination membranes with ultralow biofouling

Wansuk Choi, Changhoon Lee, Dahye Lee, Young June Won, Gi Wook Lee, Min Gyu Shin, Byoungjin Chun, Taek Seung Kim, Hee-Deung Park, Hyun Wook Jung, Jong Suk Lee, Jung-hyun Lee

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16 Citations (Scopus)

Abstract

Biofouling is a pervasive problem for any materials that are exposed to aquatic environments. Especially, it is a dire problem for the desalination membranes used to sustainably supply clean water, necessitating development of the methods to mitigate membrane biofouling. We present a topological modification approach to achieve ultralow fouling of water desalination membranes by realizing the sharkskin-mimetic (Sharklet) surface patterns and identify their unique antifouling mechanism based on computational fluid dynamics simulation. Our approach relies on a newly developed layered interfacial polymerization that can produce a conformal selective layer on patterned porous supports prepared by phase separation micromolding. The Sharklet-patterned membrane exhibited remarkably low biofouling compared to the conventional membranes with irregular roughness and topologically modulated membranes with simple patterns. Its superior biofouling resistance is attributed to the unique Sharklet geometry that can significantly inhibit biofilm growth. Furthermore, under dynamic flow conditions, the intricate Sharklet geometry induces a complex surface flow by symmetrically generating a secondary flow perpendicular to the primary flow, forming a periodic inflow and outflow along the pattern. The reinforced primary and secondary flows of the Sharklet pattern may further contribute to its excellent biofouling resistance.

Original languageEnglish
Pages (from-to)23034-23045
Number of pages12
JournalJournal of Materials Chemistry A
Volume6
Issue number45
DOIs
Publication statusPublished - 2018 Jan 1

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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    Choi, W., Lee, C., Lee, D., Won, Y. J., Lee, G. W., Shin, M. G., Chun, B., Kim, T. S., Park, H-D., Jung, H. W., Lee, J. S., & Lee, J. (2018). Sharkskin-mimetic desalination membranes with ultralow biofouling. Journal of Materials Chemistry A, 6(45), 23034-23045. https://doi.org/10.1039/c8ta06125d