Abstract
A
composite
film
with
multistage
mechanisms
for
effective
electromagnetic
interference
(EMI)
shielding
in
the
ultra‐wide
frequency
of
8–20
GHz
was
designed.
Poly(vinyl
alcohol‐co‐ethylene)
(PVA‐co‐PE)
nanofibers
and
twill‐structured
nylon
6
fabric
are
used
as
substrate
filter
film,
respectively.
Subsequently,
a
PVA‐co‐PE/silver
nanowire
(AgNW)/MXene
(PVA/Ag/M)
is
prepared
by
vacuum
filtration,
templating,
hot‐pressing.
2.5
wt.%
AgNW/MXene
content,
EMI
efficiency
(SE),
normalized
SE
(SE/t),
absolute
(SSE/t)
101.6
dB,
7008.3
dB
cm
−1
,
36501.5
2
g
These
results
attributed
to
synergistic
enabled
twill
gradient
structure
highly
conductive.
The
surface
promotes
95%
wave
adsorption,
directing
along
interior,
significantly
increasing
EM
collision
probability
internal
reflection
times.
rich
number
hydrogen
bonds
increase
interfacial
adhesion
between
layers
enhance
tensile
stress
up
26.8
MPa.
PVA/Ag/M
exhibits
excellent
Joule
heating,
rapid
heat
dissipation,
non‐flammability,
hydrophobicity,
super‐flexibility,
stability.
This
paper
presents
an
fabrication
strategy
ultralight
conformable
low‐filling
films
high
strength,
SE,
outstanding
thermal
performance.
Advanced Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 28, 2025
Abstract
Crack
damage
and
expansion
are
prevalent
issues
in
outdoor
materials,
which
absorb
or
transmit
sunlight
to
damaged
areas,
substantially
impairing
the
functionality
of
passive
radiative
cooling
systems.
Herein,
a
silicone/dielectric
compound
is
introduced
that
both
self‐healing
crack‐resistant,
developed
through
synthesis
dynamic
crack‐resistant
polymer/dielectric
hydrogen
bond
network.
This
network
incorporates
boron
nitride
dielectrics,
serve
as
scatterers
acceptors,
with
customized
silicone
polymer
featuring
high
atmospheric
window
emissive
chain
segments
UV–vis‐NIR
transparent
moieties.
When
cracks
form,
polymer's
mobility
allows
moieties
re‐associate,
realizing
from
micrometers
millimeters
wide
restoring
performance
≈100%.
The
combination
rigid
sacrificial
bonds
also
enhances
materials’
fracture
energy
865%,
effectively
preventing
further
crack
propagation
under
stress
autonomous
blunting
deflection.
These
remarkable
characteristics
make
this
highly
suited
for
increasingly
complex,
dynamic,
prolonged
application
environments.
ACS Applied Materials & Interfaces,
Год журнала:
2024,
Номер
16(45), С. 62721 - 62731
Опубликована: Окт. 30, 2024
Aluminum
nitride
(AlN),
noted
for
its
excellent
thermal
conductivity
and
exceptional
electrical
insulation,
presents
a
promising
alternative
to
traditional
ceramic
particles
in
interface
materials
(TIMs).
However,
broader
adoption
practical
applications
is
limited
by
performance
degradation
due
the
vulnerability
of
crystal
structure
ubiquitous
moisture.
This
study
introduces
dual
solution,
utilizing
mechanochemical
method
design
dense
outer
layer
Galinstan
liquid
metal
(LM)
that
simultaneously
enhances
AlN's
resistance
hydrolysis
improves
TIM
applications.
The
high
surface
free
energy
LM
imparts
hydrophobic
properties
AlN
and,
combined
with
oxides,
forms
dual-layer
protective
barrier
prevents
water
penetration,
significantly
enhancing
TIM's
long-term
stability
high-humidity
conditions.
Additionally,
at
thixotropic
interfacial
heat
transport
through
bridging
effect
LM,
resulting
improved
rheological
mobility
composite
material.
win–win
modification
strategy
opens
opportunities
durable
application
widespread
electronic
management.
Advanced Functional Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 10, 2025
Abstract
Quantum
size
effects
and
interfacial
dimensional
interactions
enable
nanometer‐scale
hierarchical
heterostructures
to
adjust
band
structures
by
energy
level
discretization,
impurity
formation,
inversion,
allowing
for
controlled
carrier
localization
directional
relaxation.
These
unique
characteristics
show
great
potential
applications
in
ferroelectrics,
optoelectronics,
capacitors,
sensors.
Yet,
optimizing
performance
fine‐tuning
the
properties
of
nanoscale
systems,
especially
composition,
remains
a
considerable
challenge.
Here
dimensionally
confined
synthesis
is
reported
through
pyrolysis‐based
metal‐organic
framework‐on‐metal‐organic
framework
(MOF‐on‐MOF)
strategy,
resulting
continuous
metal‐carbon
carbon‐oxide
interfaces
below
50
nm.
Off‐axis
electron
holography
theoretical
calculations
are
utilized
visualize
dynamic
conversion
between
localized
free
electrons,
as
well
relaxation
processes
high‐density
magnetic
coupling
at
nanoscale.
phenomena
rarely
observed
micron‐scale
or
non‐hierarchical
heterostructures.
improvements
lead
significantly
enhanced
dielectric
properties,
efficient
interaction
with
high‐frequency
electromagnetic
(EM)
fields,
indicated
loss
bandwidth
covering
full
C‐band.
Future
work
will
explore
constructing
these
targeted
materials
examine
new
such
topological
behavior,
ferrimagnetism,
giant
magnetoresistance,
sustainability
optoelectronic
technology.
Enhancing
the
wettability
of
liquid
metals
(LMs)
to
address
their
high
surface
tensions
is
crucial
for
practical
applications.
However,
controlling
LMs
wetting
on
various
substrates
and
understanding
underlying
mechanisms
are
challenging.
Here,
we
present
a
facile
dynamic-wetting
strategy
modulate
eutectic
gallium-indium
(EGaIn)
via
chemical
modification,
spontaneously
forming
stable
thin
(∼18
μm)
EGaIn
layer.
Polymer
exhibiting
varying
behaviors
can
be
categorized
by
sliding
angles
adhesion
force.
X-ray
photoelectron
spectroscopy
results
demonstrate
that
process
occurs
only
surfaces
with
sufficient
oxygen-containing
functional
groups
(content
≥18%)
confirm
coordination
interactions
between
oxide
layer
groups.
Furthermore,
in
thermal
management
systems,
heat
transfer
rate
group
increased
up
20%
compared
nonwetting
group.
This
work
will
hasten
application
flexible
circuits
management.
