am9b11113_si_006.avi (2.81 MB)
Download fileCatalyst-Free and Rapid Chemical Approach for in Situ Growth of “Chemically Reactive” and Porous Polymeric Coating
media
posted on 2019-09-05, 18:03 authored by Supriya Das, Avijit Das, Dibyangana Parbat, Uttam MannaDesign of “chemically
reactive” coating with a tailored
topography is a simple basis for optimizing various physical and chemical
parameters, which is essential for achieving different biomimicked
liquid wettability. In general, the essential topography and appropriate
chemistry in the superhydrophobic coating is optimized following various
top-down and bottom-up approaches, where various hydrophilic building
blocks are associated using electrostatic interaction, hydrogen bonding,
and other weak bonding (e.g., metal-thiol etc.), for both developing
the desired hierarchical features and optimizing the appropriate chemistry
on top of this featured interface. Such designs are inappropriate
to sustain practically relentlessly harsh settings. So, further development
for the synthesis of a durable and substrate-independent superhydrophobic
coating is essential for various prospective applications in “real-world”
scenarios. However, the design of highly abrasion-tolerant and “absolutely”
substrate-independent artificial superhydrophobicity following a simple
and scalable synthesis procedure is rare in literature. In this current
work, a catalyst-free and facile chemical approach is adopted for
an in situ and rapid deposition of a “chemically reactive”
nanocomplex for decorating a wide range of substrates, including water-soluble,
water-sensitive, highly flexible, rigid, and fibrous substrates with
a highly tolerant biomimicked superhydrophobicity property. Branched
poly(ethylenimine) (BPEI) and dipentaerythritol pentaacrylate (5Acl)
mutually react through 1,4-conjugate addition reaction, and a hierarchically
featured “chemically reactive” dip-coating is synthesized
by the appropriate selection of the alcoholic solvent that is 1-heptanol.
Furthermore, the choice of small alkylamines for post-covalent modifications
of the “chemically reactive” dip-coating provided superhydrophobicity
with a tailored water adhesion. A gradual increase in both roll-off
angles, and the contact angle hysteresis (from 5° to 30°)
was noted with a decrease in the hydrocarbon tail of selected alkylamines.
The synthesized biomimicked interfaces are capable of performing under
various practically relevant, severe physical and chemical challenges
including bending, creasing, twisting, different physical abrasions
(i.e., adhesive tape peeling test, abrasive sand paper test, etc.),
high compressive strain, highly acidic and alkaline aqueous phases,
artificial sea water, river water, etc. Moreover, this current approach
was extended in developing various relevant functional materials,
including superhydrophilic/superhydrophobic physical patterns on flexible
papers and highly compressible super-oil-absorbent, etc.
History
Usage metrics
Read the peer-reviewed publication
Categories
Keywords
biomimicked superhydrophobicity propertychemical approachBPEIchemical challengesreactivealkylamine1- heptanolpost-covalent modificationsRapid Chemical Approachscalable synthesis procedureriver watersuperhydrophobic coatingbiomimicked interfacesSuch designssea waterdip-coatingsand paper testchemical parameterstopographybuilding blockscompressible super-oil-absorbentSitu Growthbottom-up approachesPorous Polymeric Coating Designroll-off angleswater adhesionhydrocarbon tailcontact angle hysteresissubstrate-independent superhydrophobic coating