physica status solidi (a),
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 14, 2024
Flaky
FeSiCr@Ni
0.5
Zn
Fe
2
O
4
composites
are
successfully
synthesized
via
ball
milling
and
hydrothermal
method.
The
microstructure,
morphology,
phase
composition
of
flaky
analyzed
using
X‐Ray
diffractometer,
energy
dispersive
spectroscopy,
scanning
electron
microscope,
transmission
microscope
techniques.
electromagnetic
wave
absorption
characteristics
the
composite
with
varying
contents
Ni
comprehensively
investigated.
results
show
that
introduction
reduces
permittivity,
improves
synergistic
effect
magnetic
loss
dielectric
loss,
optimizes
impedance
matching,
enhances
overall
performance
composites.
sample
prepared
a
40
wt%
displays
most
pronounced
performance.
RL
min
(reflection
loss)
reached
−41.3
dB
at
4.3
GHz,
maximum
effective
bandwidth
(EAB)
reaches
5.6
GHz
which
is
7–8
times
original
sample.
Notably,
through
adjusting
thickness
composites,
EAB
could
be
broadened
to
10.5
(2.5–13.0
GHz),
encompassing
entire
C
X
bands.
have
advantages
wide
source
raw
materials,
strong
microwave
ability,
frequency
range,
expected
become
potential
material
in
future.
Advanced Functional Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 9, 2024
Abstract
Microwave
absorbing
materials
play
an
increasingly
important
role
in
modern
electronic
warfare
technology
for
enhancing
electromagnetic
compatibility
and
suppressing
interference.
High‐entropy
ceramics
(HECs)
possess
extraordinary
physical
chemical
properties,
more
importantly,
the
high
tunability
of
multi‐component
HECs
has
brought
new
opportunities
to
microwave
materials.
Rich
crystallographic
distortions
occupancies
enable
have
highly
efficient
absorption
excellent
mechanical
thermal
stability.
Therefore,
structural
advantages
are
integrated
from
comprehensive
perspectives,
emphasizing
on
dielectric
magnetic
properties
phenomenon.
Strategies
proposed
improve
capacity
HECs,
including
composition
optimization,
microstructure
engineering,
post‐treatment
technology.
Finally,
problems
obstacles
associated
with
high‐entropy
(HEMs)
research
discussed.
The
innovative
design
concepts
highlighted.
Sharp
corners
and
edges
with
high
surface
curvature
provide
low-dimensional
nanosized
materials
special
static
magnetic
properties.
However,
the
engineering
of
their
high-frequency
response
remains
challenging,
underlying
mechanism
requires
further
clarification.
In
this
study,
we
propose
a
template-aided
reorganization
strategy
for
integrating
surfaces
different
curvatures
into
one
permalloy
architecture.
The
high-curvature
demonstrates
dramatic
variation
in
localized
moments
confines
coupling
flux
lines
owing
to
anisotropy,
which
helps
concentrate
energy
absorption
dissipation.
addition,
resonances
multiple
were
superimposed
by
spin-wave
interaction
enhancing
loss
capacity,
cooperates
amorphous/crystalline
interfacial
polarization
achieve
satisfactory
dielectric–magnetic
synergistic
electromagnetic
wave
(EMW)
performance.
reflectance
values
increased
from
−13.4
dB
microspheres
−49.7
surface-restructured
ones.
Remarkably,
effective
bandwidth
can
be
extended
7.68
GHz
matching
thickness
2.0
mm.
This
advancement
presents
new
possibilities
an
elaborate
design
EMW
absorbers
establishes
basis
comprehending
complex
mechanism.
Research Square (Research Square),
Год журнала:
2025,
Номер
unknown
Опубликована: Март 14, 2025
Abstract
The
increasing
demand
for
electronic
products
has
exacerbated
the
phenomenon
of
electromagnetic
pollution,
which
in
turn
driven
development
high-performance
flexible
microwave
absorbing
materials.
In
this
work,
cotton
fabrics
were
first
modified
with
polydopamine
(PDA).
Afterwards,
polydimethylsiloxane
(PDMS)
and
porous
peanut
shell
carbon
material
(KPS)
applied
to
fabric.
prepared
fabric
showed
superhydrophobicity
a
water
droplet
contact
angle
163.7°.
optimized
exhibited
excellent
wave-absorbing
performance
due
synergistic
effect
conduction
loss,
interfacial
polarization
loss
surface
roughness
topography.
At
matching
thickness
2.5
mm,
minimum
reflection
value
reached
47.13
dB,
effective
bandwidth
covered
almost
entire
X-band.
PDA/KPS/PDMS-Cotton
had
UV
resistance.
Its
UPF
is
1317.31,
transmittance
UVA
UVB
was
0.11%
0.06%,
respectively.
addition,
obtained
robust
enough
withstand
damage
such
as
repeated
rubbing
still
maintained
absorption
properties.
This
study
provided
promising
way
develop
durable
materials
