Inspired by mucus,
which provides an ideal supramolecular model and whose fluid-like
(viscous) and solid-like (elastic) behaviors can be adjusted to meet
different physiological requirements, we report oil-regulated supramolecular
adhesives by the co-assembly of polyurea oligomers and carvacrol oils.
The adhesive is crosslinked by weak but abundant hydrogen bonds, which
can be regulated by the incorporated carvacrol oils through the competition
of intermolecular hydrogen bonds, presenting a unique set of mucus-mimicking
features including oil-regulated mechanics, processability, reusable
adhesivity, and extreme longevity in both air and water. Owing to
the intrinsic bactericidal effect of the carvacrol oils, the developed
adhesives can serve as potent antibacterial coatings with both rapid
contact killing (99.9% killing within 15 min) and long-term controlled
release abilities (up to 70 days), enabling versatile antibacterial
applications in diverse conditions. We envision that these adhesives
will be useful in buildings and architectures, community and public
facilities, food storage and packaging technologies, functional textiles,
and practical biomedical fields.
Precise and robust manipulation of
air bubbles will favor intense demands from governing processes of
chemical reactions to enhancing transportation efficiency in multiphase
engineering systems. Inspired by the working mechanism of mucous lining
in lung alveoli, the elastic liquid-infused material (eLIM) is constructed
by infiltrating an interconnected porous elastomer with a low-surface-energy
lining liquid. With the help of the lining liquid, the pore pressure
of the interconnected channels in eLIM can be reversibly regulated
under mechanical stretching, balancing the capillary pressure in the
channels with diverse radii and allowing gas flow in these channels.
Therefore, air bubbles could be transported in and across the eLIM,
showing on-demand control on the bubble contact angle, merging and
splitting in an active and precise manner. The robust manipulation
strategies on air bubbles can find applications in bioreactors and
many other bubble-involved processes.
The hexagonal boron nitride (h-BN)
nanosheets have been used as
nanofillers to improve the barrier properties of the waterborne epoxy
(WEP) coatings. However, the h-BN nanosheets tend to agglomerate,
which limits their anticorrosion applications. In this paper, the
h-BN/polyaniline (h-BN/PANI) nanocomposites were prepared by the in
situ polymerization of aniline on the surfaces of the h-BN nanosheets,
which were further used to improve the anticorrosion performance of
the WEP coatings. The structures of the as-prepared h-BN/PANI nanocomposites
were investigated by scanning electron microscopy, transmission electron
microscopy, Fourier transform infrared spectroscopy, thermogravimetric
analysis, and X-ray photoelectron spectroscopy. The anticorrosion
performances of the coatings were evaluated by electrochemical impedance
spectroscopy. After immersion in 3.5 wt % NaCl solution for 28 days,
the macro-morphologies and elemental changes of the substrate surfaces
were analyzed by a 3D digital microscope and an energy-dispersive
spectroscope, respectively. The results showed that the WEP coatings
with the h-BN/PANI nanocomposites, especially that with 2 wt % h-BN/PANI
nanocomposites, exhibited remarkably reinforced anticorrosion performance
compared to the pure WEP coating. For the WEP coating, the coating
with 1 wt % PANI, and the coating with 1 wt % h-BN, the substrates
have been completely corroded. However, there was no obvious corrosion
region for the coating containing 2 wt % h-BN/PANI nanocomposites.
The superior anticorrosion performance of the coatings with h-BN/PANI
nanocomposites was mainly attributed to the synergistic effect of
the well-dispersed h-BN/PANI nanocomposites as the physical barrier
and PANI as the corrosion inhibitor in this system.
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