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Fabricating Janus Membranes via Physicochemical Selective Chemical Vapor Deposition
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  • Mahdi Mohammadi Ghaleni,
  • Elham Tavakoli,
  • Mona Bavarian,
  • Siamak Nejati
Mahdi Mohammadi Ghaleni
University of Nebraska-Lincoln
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Elham Tavakoli
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Mona Bavarian
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Siamak Nejati
University of Nebraska-Lincoln
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Abstract

Membranes with asymmetric wettability-Janus membranes-have recently received considerable attention for a variety of critical applications. Nonetheless, the current methods for making such membranes are still challenging. Here, we report on a simple approach to introduce asymmetric wettability into hydrophilic porous domains. Our approach is based on the physicochemical-selective deposition of polytetrafluoroethylene (PTFE) on hydrophilic polymeric substrates. The physicochemical inhibition was achieved through prefilling the substrates with glycerol, containing a known amount of free radical inhibitors. We showed that the glycerol/inhibitor mixture hinders the deposition of PTFE within the membrane pores. As a result, the surface of the substrates remains open and porous. The fabricated Janus membranes show stable wetting-resistant properties, evaluated through sessile drop contact angle measurements and direct contact membrane distillation (DCMD).

Peer review status:ACCEPTED

10 Apr 2020Submitted to AIChE Journal
15 Apr 2020Submission Checks Completed
15 Apr 2020Assigned to Editor
16 Apr 2020Reviewer(s) Assigned
15 May 2020Editorial Decision: Revise Major
30 Jun 20201st Revision Received
06 Jul 2020Submission Checks Completed
06 Jul 2020Assigned to Editor
08 Jul 2020Reviewer(s) Assigned
03 Aug 2020Editorial Decision: Accept