Bioinspired polylactic acid/polyethylene glycol @ silicon dioxide microfibrous tarpaulin with dual-layer heterogeneous structure for enhanced daytime radiative cooling
International Journal of Biological Macromolecules,
Год журнала:
2024,
Номер
282, С. 136420 - 136420
Опубликована: Окт. 9, 2024
Язык: Английский
Bioinspired Adhesives with Debonding-on-Demand Capability
ACS Macro Letters,
Год журнала:
2025,
Номер
unknown, С. 420 - 427
Опубликована: Март 18, 2025
Adhesives
with
debonding-on-demand
(DoD)
capability
can
simplify
and
improve
manufacturing
processes,
extend
the
life
cycle
of
products,
facilitate
recycling,
thus
attracting
fast-growing
interest
for
use
in
different
sectors.
A
general
design
approach
DoD
adhesives
is
based
on
supramolecular
polymers,
which
be
disassembled
by
an
external
stimulus,
allowing
modification
physical
properties
these
materials.
However,
adhesive
strength
generally
limited
to
a
few
megapascals,
their
synthesis
often
quite
involved.
Here,
we
report
that
problems
overcome
family
were
inspired
structure
function
natural
resin
shellac.
These
are
linear
oligomers
bisphenol
diglycidyl
ether
secondary
diamines
have,
despite
widespread
cross-linked
epoxy
thermosets,
remained
unexplored
far.
We
show
if
molecular
weight
limited,
highly
soluble
melt-processable
produced.
Adhesion
tests
performed
lap
joints
made
stainless
steel
substrates
reveal
shear
3.5-16
MPa,
upper
limit
this
range
exceeds
bond
shellac
blueprint
many
previous
adhesives.
demonstrate
debonding
upon
heating
above
glass
transition
temperature
readily
possible
broken
easily
rebond
without
any
loss
strength.
Язык: Английский
Evaluating silver nanoparticles, copper coatings, and zinc oxide nanostructures for antimicrobial medical device applications
Matéria (Rio de Janeiro),
Год журнала:
2024,
Номер
29(4)
Опубликована: Янв. 1, 2024
ABSTRACT
The
increase
in
hospital-acquired
infections
(HAIs)
associated
with
medical
devices
underscores
the
need
for
antimicrobial
coatings.
This
study
aims
to
compare
efficacy,
biocompatibility,
ion
release,
and
durability
of
silver
nanoparticles,
copper
coatings,
zinc
oxide
nanostructures
as
coatings
devices.
Coatings
were
prepared
characterized,
efficacy
tested
against
E.
coli
S.
aureus
via
inhibition
zone
measurements.
Silver
demonstrated
highest
effect,
zones
averaging
90%,
while
showed
moderate
80%
70%,
respectively.
Biocompatibility,
assessed
using
human
fibroblasts
an
MTT
assay,
cell
viability
oxide,
followed
by
silver.
Durability
tests
under
simulated
physiological
conditions
indicated
that
retained
over
90%
structural
integrity,
greater
degradation.
Ion
release
profiles
highlighted
silver’s
rapid
ideal
short-term
activity,
steady,
sustained
release.
These
findings
suggest
immediate
infection
control,
offer
balanced
long-term
safety
durability,
making
them
suitable
extended
applications
Язык: Английский