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Multifunctional pH-Switched Superwetting Copolymer Nanotextile: Surface Engineered toward on-Demand Light Oil–Water Separation on Superhydrophilic–Underwater Low-Adhesive Superoleophobic Nonwoven Mesh
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posted on 2019-03-31, 00:00 authored by Zahed Shami, Atefeh Gharloghi, Seyed Mojtaba AmininasabThe
high performance of an oil–water separator relies largely
on unique design of the architecture with a hierarchical and porous
morphology as well as smart wetting responsiveness of active materials.
A well-structured NaOH-treated antioil nonwoven mesh with in-situ
and ex-situ pH-switched wetting was successfully prepared by controlled
electrospinning of SAN copolymer followed by thermal treating in NaOH
aqueous solution. The as-obtained robust and flexible pH-switched
antioil mesh with highly accessible pH-responsive groups and a 3D
open porous network geometry not only will achieve durable superhydrophilicity/superoleophobicity
in air but also a superior underwater low-adhesive superoleophobicity
could be obtained, leading the surface to be successfully used for
long-term usage immiscible/emulsified light oil–water separation
using only gravity-driven force with excellent antioil fouling during
multiple cycles. Simultaneously, the water-soluble pollutant could
be effectively captured by the antioil mesh and simply released in
ethanol media. The “extended coil conformation” and
“intermolecular hydrogen bonding” are proposed to explain
the antioil wetting behavior. Most importantly, smart reversible pH
switching from antioil to antiwater wetting could be simply and quickly
obtained only by immersing the NaOH-treated mesh in acidic-aqueous
solution to obtain an acid-treated antiwater mesh acting in “oil
removing”, which is repeatedly cycled without causing any damage
to the mesh and loss of pH responsiveness. It is believed that such
highly cost-effective and commercially scaled up smart material will
be a promising candidate for use in removal of oil-polluted waters
in the future.
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low-adhesive superoleophobicityoil-polluted watersNaOH-treated antioil nonwoven meshSAN copolymerNaOH-treated meshSurface Engineeredacidic-aqueous solutionethanol mediapH responsivenesspH-switched antioil meshex-situ pH-switchedantioil foulingpH-responsive groupsnetwork geometryantioil mesh3 Dgravity-driven forceMultifunctional pH-Switched Superwetting Copolymer Nanotextileacid-treated antiwater mesh
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