Sharkskin-mimetic desalination membranes with ultralow biofouling

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 mod...

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Published inJournal of materials chemistry. A, Materials for energy and sustainability Vol. 6; no. 45; pp. 23034 - 23045
Main Authors Choi, Wansuk, Lee, Changhoon, Lee, Dahye, Won, Young June, Lee, Gi Wook, Shin, Min Gyu, Chun, Byoungjin, Kim, Taek-Seung, Park, Hee-Deung, Jung, Hyun Wook, Lee, Jong Suk, Lee, Jung-Hyun
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 2018
Subjects
Antifouling substances
Aquatic environment
Biofilms
Biofouling
Computational fluid dynamics
Computer applications
Computer simulation
Desalination
Fluid dynamics
Geometry
Hydrodynamics
Inflow
Local flow
Membranes
Orange peel
Outflow
Phase separation
Polymerization
Secondary flow
Structural analysis
Surface flow
Sustainable development
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Summary: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.
ISSN:2050-7488
2050-7496
DOI:10.1039/C8TA06125D