Advanced Functional Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 4, 2025
Abstract
Intelligent
electromagnetic
interference
(EMI)
shielding
materials,
with
their
tunable
EM
wave
response
characteristics,
have
attracted
much
attention.
However,
the
molecular‐level
mechanism
is
under‐explored
and
tuning
range
narrow.
This
study
proposes
an
EMI
switch
hydrogel
based
on
molecular
precision
manipulation
of
a
thermoresistive
network
capable
adaptively
regulating
performance.
It
has
two
temperature‐controlled
switching
states:
on/off
strong/weak
shielding.
The
consists
interpenetrating
polyvinyl
alcohol
(PVA)
poly(N‐isopropylacrylamide)
(PNIPAM)
networks,
giving
it
thermal
shrinkable
properties.
A
temperature‐induced
high
contact
resistance
MXene‐carbon
nanotubes
(MXene‐CNTs)
conductive
assembled
within
it.
combination
enables
to
switchable
performance
in
X‐band,
9.3–53.9
dB
at
different
temperatures
or
thicknesses.
remarkable
results
from
synergistic
effect
temperature‐driven
shrinkage
matrix
network,
involving
adjustments
particle
stacking,
conductivity,
transmission
path.
MXenes
offer
remote‐controlled
photothermal‐responsive
Significantly,
hydrogel's
self‐healing
properties
allow
endure
damage
its
can
be
quickly
restored.
work
paves
new
way
for
rational
design
adaptive
devices
level.
Advanced Functional Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 5, 2025
Abstract
Electronic
devices
are
becoming
portable,
miniaturized,
and
high
performance,
more
widely
used
in
emerging
complex
fields.
Electromagnetic
functional
materials
with
multiple
functions
that
can
be
applied
to
scenarios
urgently
need
developed.
This
research
assembled
a
multifunctional
magnetic
heterodimensional
structure
through
interface
defect
engineering,
conceived
an
innovative
hybrid
energy
storage
device
antenna.
The
exhibits
excellent
microwave
absorption,
electromagnetic
interference
(EMI)
shielding
properties.
minimum
reflection
loss
is
−57.06
dB
at
6.16
GHz,
the
optimal
EMI
effectiveness
74.08
18
GHz.
At
current
densities
of
0.5
3
A
g
−1
,
discharge/charge
specific
capacities
remain
836.64/820.48
401.4/401.7
mAh
after
300
500
cycles,
respectively.
Hybrid
convert
into
electrical
for
storage.
antenna
shows
harvesting
characteristic
S,
C,
X,
Ku
multi‐bands.
|S
11
|
reach
−65.6
tuned
by
adjusting
dielectric
substrate
thickness.
work
will
furnish
new
prospects
design
development
scenarios.
Nano-Micro Letters,
Год журнала:
2025,
Номер
17(1)
Опубликована: Март 24, 2025
Abstract
High-temperature
stealth
is
vital
for
enhancing
the
concealment,
survivability,
and
longevity
of
critical
assets.
However,
achieving
across
multiple
infrared
bands—particularly
in
short-wave
(SWIR)
band—along
with
microwave
efficient
thermal
management
at
high
temperatures,
remains
a
significant
challenge.
Here,
we
propose
strategy
that
integrates
an
IR-selective
emitter
(Mo/Si
multilayer
films)
metasurface
(TiB
2
–Al
O
3
–TiB
)
to
enable
multi-infrared
band
stealth,
encompassing
mid-wave
(MWIR),
long-wave
(LWIR),
SWIR
bands,
(X-band)
700
°C,
simultaneous
radiative
cooling
non-atmospheric
window
(5–8
μm).
At
device
exhibits
low
emissivity
0.38/0.44/0.60
MWIR/LWIR/SWIR
reflection
loss
below
−
dB
X-band
(9.6–12
GHz),
0.82
5–8
μm
range—corresponding
power
9.57
kW
m
−2
.
Moreover,
under
input
17.3
—equivalent
aerodynamic
heating
Mach
2.2—the
demonstrates
temperature
reduction
72.4
°C
compared
conventional
low-emissivity
molybdenum
surface
temperatures.
This
work
provides
comprehensive
guidance
on
high-temperature
design,
far-reaching
implications
multispectral
information
processing
extreme
environments.
Abstract
The
modulation
of
transport
properties
in
ceramic‐based
semiconductors
can
be
used
to
optimize
the
electromagnetic
response
mechanism
and
performance.
A
semiconductor
ceramic
foam
interlayer
wall
(SCFW)
is
designed
by
a
physical
vapor
deposition
method.
structural
SCFW
composed
semiconductor‐insulator‐semiconductor
layers,
incorporating
composite
system
SiC,
Al
4.8
Si
1.2
O
9.6
,
2
3
.
Moreover,
hierarchical
network
structure
controlled
pyrolysis‐deposition
kinetic
process.
Electrons
holes
are
transported
through
heterojunctions
between
SiC
achieving
effective
charge
relaxation.
matrix
provides
lightweight
(density
0.967
g
cm
−3
),
while
determines
excellent
wave
(EMW)
absorption
performance
SCFW,
with
an
bandwidth
up
14.8
GHz
under
(minimum
reflection
loss
RL
min
=
−50.6
dB).
has
been
proven
exhibit
corrosion
resistance
thermal
insulation
properties,
conductivity
0.025
W
m
−1
K
This
study
valuable
insights
into
design
dielectric
property
optimization
nanocomposites,
which
leads
strong
polarization
loss,
opening
new
avenues
for
application
EMW
absorbers,
ceramics.
Journal of the American Ceramic Society,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 22, 2025
Abstract
To
meet
the
rigorous
demands
placed
on
electromagnetic
(EM)
wave
absorbing
(EWA)
materials
by
harsh
service
conditions
and
to
reduce
EM
power
density,
development
of
ceramic‐based
EWA
with
high
reliability
stability
has
become
a
subject
significant
focus.
In
this
study,
yttrium
silicide
carbide
interphase
was
in
situ
synthesized
silicon
fibers
fabricate
Y₃Si₂C₂–SiC
f
composite
molten
salt
method.
These
were
then
incorporated
into
mullite
ceramic
matrix,
/mullite
composites
prepared
gel
injection
molding,
aiming
at
enhancing
properties.
The
exhibited
reflection
loss
−28.97
dB
2.44
mm
thickness
an
effective
absorption
bandwidth
3.066
GHz,
outperforming
pure
SiC
due
addition
.
A
modified
Drude–Lorentz
model
developed
capture
multi‐peak
permittivity
behavior
composites.
results
showed
that
dipole
relaxation
hopping
migration
localized
electrons
played
key
roles
overall
microwave
energy
attenuation,
which
closely
matched
experimental
data.
Furthermore,
simulations
electric
field
distribution
radar
cross‐section
confirmed
superior
capability
practical
application
potential
This
study
offers
valuable
theoretical
insights
design
‐reinforced
materials.
Aerogels
with
porous
structures
offer
an
attractive
approach
to
modulating
electromagnetic
parameters
and
enhancing
wave
(EMW)
absorption
performance.
However,
conventional
aerogels
are
limited
by
their
single-scale
pore
size
fixed
orientation,
which
constrain
EMW
capabilities.
This
study
introduces
dual-scale
pores
dual-network
structure
constructed
via
constant-temperature
freezing
secondary-infusion
method.
Multiscale
both
micrometer-
submillimeter-scale
when
the
Ti3C2Tx
MXene
thermoplastic
polyurethane
solution
is
frozen
dried
at
a
specific
temperature,
leading
ultra-wide
effective
bandwidth
(EAB)
reaching
10.41
GHz
in
vertical
direction.
Furthermore,
address
poor
parallel
direction,
secondary
infusion
method
applied
form
aerogel
structure,
forms
reflective
interfaces
perpendicular
incident
various
directions.
adjustment
enhances
EAB
direction
from
1.58
5.93
GHz,
marking
275.32%
enhancement,
while
reaches
8.08
GHz.
design
strategy
overcomes
limitations
of
structural
scale
arrangement
enriching
attenuation
mechanisms
absorber,
effectively
reducing
sensitivity
incoming
EMW,
offering
new
insights
for
designing
efficient
absorbers.
