Advanced Functional Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Июль 25, 2024
Abstract
Extreme
cold
events
are
becoming
more
frequent
and
intense
around
the
world,
imposing
a
huge
burden
on
human
health
global
economy.
However,
developing
fibrous
materials
featuring
ultralight
weight,
high
shape
retention,
thermal
insulation
to
withstand
extreme
conditions
remains
great
challenge.
Herein,
inspired
by
natural
porous
loofah,
an
superelastic
micro/nanofibrous
aerogel
(MNFA)
that
integrates
hierarchical
pores
stable
physical
entanglements
is
directly
synthesized
via
gelation
electrospinning
technology.
By
manipulating
solution/water
molecules
interaction
of
charged
jets,
structure
consisting
networks
microfibers
developed,
which
endows
MNFA
with
porosity
(99.7%).
Benefiting
from
entanglement
between
rigid
flexible
nanofibers,
resulting
can
large
tensile
stress
(4000
times
its
weight)
1000
compression
cycles
without
being
damaged.
Moreover,
exhibits
feature
(3
mg
cm
−3
)
performance
(low
conductivity
25.3
mW
m
−1
K
),
making
promising
contender
for
highly
efficient
insulation.
This
work
offer
fresh
perspectives
design
advancement
advanced
aerogels
variety
uses.
Abstract
With
the
rapid
development
of
electronic
industry,
it's
pressing
to
develop
multifunctional
electromagnetic
interference
(EMI)
shielding
materials
ensure
stable
operation
devices.
Herein,
multilayered
flexible
PEG@PAN/MXene
(Ti
3
C
2
T
x
)/PVDF@SiO
(PMF)
composite
film
has
been
constructed
from
level
microstructure
design
via
coaxial
electrospinning,
coating
spraying,
and
uniaxial
electrospinning
strategies.
Benefiting
effective
encapsulation
for
PEG
high
conductivity
MXene
coating,
with
loading
density
0.70
mg
cm
−2
exhibits
thermal
energy
storage
120.77
J
g
−1
great
EMI
performance
(EMI
SE
34.409
dB
SSE
49.086
)
in
X‐band
(8–12
GHz).
Therefore,
this
advanced
can
not
only
help
devices
prevent
influence
pollution
but
also
play
an
important
role
device
management.
Additionally,
deposition
nano
PVDF@SiO
fibers
(289
±
128
nm)
endowed
PMF
hydrophobic
properties
(water
contact
angle
126.5°)
working
hydrophilic
thereby
breaks
limitation
humid
application
environments.
The
finding
paves
a
new
way
novel
films
Nano-Micro Letters,
Год журнала:
2024,
Номер
16(1)
Опубликована: Июнь 17, 2024
Abstract
Lightweight
infrared
stealth
and
absorption-dominant
electromagnetic
interference
(EMI)
shielding
materials
are
highly
desirable
in
areas
of
aerospace,
weapons,
military
wearable
electronics.
Herein,
lightweight
high-efficiency
dual-functional
segregated
nanocomposite
foams
with
microcellular
structures
developed
for
integrated
EMI
via
the
efficient
scalable
supercritical
CO
2
(SC-CO
)
foaming
combined
hydrogen
bonding
assembly
compression
molding
strategy.
The
obtained
exhibit
superior
performances
benefitting
from
synergistic
effect
effective
thermal
insulation
low
emissivity,
outstanding
attributed
to
synchronous
construction
structures.
Particularly,
present
a
large
radiation
temperature
reduction
70.2
°C
at
object
100
°C,
significantly
improved
EM
wave
absorptivity/reflectivity
(
A
/
R
ratio
2.15
an
ultralow
Ti
3
C
T
x
content
1.7
vol%.
Moreover,
working
reliability
stability
upon
dynamic
cycles.
results
demonstrate
that
have
excellent
potentials
applications
Modern
detection
technology
has
driven
camouflage
toward
multispectral
compatibility
and
dynamic
regulation.
However,
developing
such
stealth
technologies
is
challenging
due
to
different
frequency-band
principles.
Here,
this
work
proposes
a
design
concept
for
fluid-actuated
compatible
smart
device
that
employs
deformable
mechanochromic
layer/elastomer
with
channeled
dielectric
layer.
After
fluid
actuation,
the
elastomer
layer
transmits
mechanical
strain
layer,
thereby
altering
visible
reflectance
wavelengths
in
[568,
699]
nm.
Concurrently,
pumped-in
liquid
reconfigures
spatial
structure
parameter
alter
microwave
resonance
diffraction
radar
absorption,
enabling
absorption
significant
broadband
at
[8.16,
18.0]
GHz.
Using
heat-absorption
property
also
achieves
infrared
stealth,
shown
by
ΔT
≈
16.5
°C
temperature
difference.
Additionally,
exhibits
rapid
response
time
(∼1
s),
excellent
cycling
performance
(100
cycles),
programmability
(10
codes),
offering
new
strategy.
Nano Materials Science,
Год журнала:
2024,
Номер
unknown
Опубликована: Июль 1, 2024
Homogeneous
heterogeneous
(heterophase)
interfaces
regulated
with
low
energy
barriers
have
a
fast
response
to
applied
electric
fields
and
could
provide
unique
interfacial
polarization,
which
facilitate
the
transport
of
electrons
across
substrate.
Such
regulation
on
is
effective
in
modulating
electromagnetic
wave
absorbing
materials.
Herein,
we
construct
NbS2–NiS2
heterostructures
NiS2
nanoparticles
uniformly
grown
NbS2
hollow
nanospheres,
such
particular
structure
enhances
polarization.
The
strong
electron
transfer
at
interface
promotes
throughout
material,
results
less
scattering,
conduct
ion
loss
dielectric
polarization
relaxation,
improves
loss,
good
impedance
matching
material.
Consequently,
band
may
be
successful
tuned.
By
regulating
amount
NiS2,
finely
alternated
so
that
overall
wave-absorbing
performance
shifted
lower
frequencies.
With
content
15
wt%
an
absorber
thickness
1.84
mm,
minimum
reflection
14.56
GHz
−53.1
dB,
absorption
bandwidth
5.04
GHz;
more
importantly,
different
bands
−20
dB,
microwave
rate
reaches
99%
when
about
1.5–4.5
mm.
This
work
demonstrates
construction
homogeneous
improving
properties,
providing
guideline
for
synthesis
highly
efficient
Advanced Functional Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 12, 2024
Abstract
In
contemporary
times,
radar
and
infrared‐compatible
stealth
materials
have
emerged
as
a
pivotal
domain
of
research
globally,
aimed
at
augmenting
the
survivability
military
assets.
However,
current
candidates
generally
exhibit
subpar
compatibility
performance
in
elevated
temperature
environments
due
to
imbalanced
interplay
between
two
spectral
bands.
this
work,
meticulously
designed
sandwich‐structure
SiO
2
/C@SiC/SiO
composite
is
proposed
cope
with
challenge.
The
middle
layer
C@SiC
composites
possesses
excellent
microwave
absorption
even
high
temperatures.
outer
layers
aerogels
serve
not
only
inhibit
infrared
radiation
intensity,
but
also
reinforce
capacity
by
optimizing
impedance
matching
reducing
heat
transferred
layer.
Based
on
numerical
simulation
outcomes,
thickness
each
has
been
optimized
attain
harmonious
balance
properties.
Ultimately,
sandwich
structured
demonstrate
low
RL
(reflection
loss)
values
(←5
dB)
across
nearly
entire
X
band
(8–12
GHz),
alongside
minimal
surface
temperatures
hovering
≈44
°C
an
ambient
200
°C.
comprehensive
investigation
into
impact
patterns
underlying
mechanisms
offers
invaluable
insights
develop
for
high‐temperature
applications,
which
can
be
applied
coatings
skin
Mach
number
aircraft.
Langmuir,
Год журнала:
2024,
Номер
40(23), С. 12148 - 12158
Опубликована: Май 28, 2024
During
the
past
decade,
ever-increasing
electromagnetic
pollution
has
excited
a
global
concern.
A
sustainable
resource,
facile
experimental
scenario,
fascinating
reflection
loss
(RL),
and
broad
efficient
bandwidth
are
substantial
factors
that
intrigue
researchers.
This
research
led
to
achievement
of
brilliant
microwave-absorbing
material
by
treating
pampas
as
biomass.
The
carbon-based
microfibers
attained
biowaste
were
treated
plasma
under
diverse
environments
amplify
their
features.
Moreover,
pyrolysis
scenario
was
performed
compare
results.
reductive
processes
H2
carbonization.
However,
CO2
regulate
heteroatoms
defects.
Interestingly,
polystyrene
(PS)
applied
matrix.
aromatic
rings
existing
in
absorbing
medium
establish
electrostatic
interactions,
elevating
interfacial
polarization,
physical
characteristics
PS
augment
practical
applications
final
product.
manipulated
biomasses
characterized
Raman,
X-ray
diffraction,
energy-dispersive
spectroscopy,
field
emission
scanning
electron
microscopy,
diffuse
spectroscopy
analyses.
Eventually,
features
estimated
vector
network
analyzer.
plasma-treated
H2/Ar
blended
with
gained
maximum
RL
−90.65
dB
at
8.79
GHz
an
(RL
≤
−10
dB)
4.24
thickness
3.20
mm;
meanwhile,
treatment
97.99
14.92
7.74
2.05
mm
thickness.
Particularly,
biomass
plasmolyzed
Ar
covered
entire
X
Ku
bands
2.10
mm.
Notably,
total
shielding
efficiencies
bioinspired
materials
up
≈99%,
desirable
for
applications.
