Developing
lightweight
polymer
shielding
membranes
with
additional
physicochemical
properties
is
of
great
significance
for
addressing
the
complex
contemporary
security
demands.
However,
precise
structural
design
at
molecular
level
remains
a
challenge.
Herein,
unique
Janus
composite
membrane
assembled
from
conductive
AgNWs/MXene
1D/2D
network
and
polyurethane
elastomer
(MPHEA),
displaying
combined
superior
electromagnetic
effectiveness
(EMSE)
up
to
80
dB
remarkable
infrared
stealth
capability
wide
temperature
range
room
50
°C.
Moreover,
endowed
chemical
crosslinking
in
resulted
exceptional
mechanical
strength,
self-healing,
adhesion.
The
maintained
(over
20
dB)
even
under
strain
40%
recovered
efficiency
90%
after
damage
self-healing
are
observed,
which
attributed
synergistic
3D
elastic
multi-dimensional
crosslinked
MPHEA@AgNWs/MXene
membrane.
This
work
has
represented
an
excellent
micro-nano
structure
strategy
on
multifunctional
wave
manager
application
scenario.
Abstract
The
pressing
demand
for
ultrathin
and
flexible
shields
to
counter
electromagnetic
interference
(EMI)
has
sparked
interest
in
Ti
3
C
2
T
x
MXene
materials
due
their
exceptional
electrical
conductivity,
tunable
surface
chemistry,
layered
structure.
However,
pure
films
often
lack
the
mechanical
properties
required
practical
engineering
applications,
traditional
reinforcement
methods
tend
reduce
conductivity.
This
work
demonstrates
an
effective
strategy
enhance
alignment
densely
packed
structure
of
by
regulating
acidity
alkalinity
aqueous
solutions.
approach
simultaneously
improves
strength
shielding
effectiveness
(EMI
SE).
Compared
with
original
films,
modified
ammonia
solution
(NH
·H
O)
via
OH
−
show
a
significant
improvement
tensile
(27.7
±
1.9
MPa).
Meanwhile,
treated
hydrochloric
acid
(HCl)
H
+
reach
even
higher
39
1.5
MPa.
Moreover,
EMI
SE
values
increase
significantly,
each
reaching
66.2
58.4
dB.
maximum
improvements
acid-
alkali-treated
samples
are
17.9%
4%,
respectively.
In
conclusion,
simultaneous
enhancement
efficacy
highlights
potential
applications
materials.
Graphical
abstract
Advanced Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 14, 2025
Polyvinylidene
fluoride
(PVDF)
is
a
semicrystalline
polymer
used
in
thin-film
dielectric
capacitors
because
of
its
inherently
high
constant
and
low
loss
tangent.
Its
can
be
increased
by
the
formation
alignment
β-phase
crystalline
structure,
which
facilitated
2D
nanofillers.
carbides
nitrides,
MXenes,
are
promising
candidates
due
to
their
notable
permittivity
ability
increase
interfacial
polarization.
Still,
mixing
challenging
weak
interactions
poor
dispersibility
MXenes
PVDF.
This
work
explores
novel
method
for
delaminating
Ti3C2Tx
MXene
directly
into
organic
solvents
while
maintaining
flake
size
quality,
as
well
use
non-solvent-induced
phase
separation
producing
both
dense
porous
PVDF-MXene
composite
films.
A
deeper
understanding
behavior
these
composites
reached
examining
with
mixed
pure
chlorine
terminations
PVDF
matrices.
Thin-film
fabricated
from
display
ultrahigh
discharge
energy
density,
exceeding
45
J
cm-3
95%
efficiency.
The
also
processed
using
green
sustainable
solvent,
propylene
carbonate.
The
study
investigates
the
structural
design
of
Ti
3
C
2
T
x
PVA
composites
in
hydrogel,
aerogel,
and
film
forms,
showing
that
EMI
shielding
mechanical
properties
are
influenced
by
composite's
configuration
areal
density.
Traditional
passive
single-spectrum
electromagnetic
defense
materials
are
inadequate
to
defend
against
complex
multispectral
threats.
Herein,
a
bilayer
heterofilm
(BLH
film)-based
magnetically
controllable
soft
actuator
(MCSA),
comprising
unit
and
drive
unit,
is
constructed.
The
offers
protection,
while
the
enables
active
via
magnetic
actuation.
synergy
allows
MCSA
provide
intelligent,
switchable
from
ultraviolet
terahertz
spectra.
BLH
film
exhibits
lowest
infrared
emissivity
of
0.04
at
14
μm
an
average
0.16
8-14
μm,
outperforming
comparable
composites
integrating
radiation
energy
management
for
enhanced
overall
protection.
It
also
demonstrates
complete
blocking
visible
light
(320-780
nm),
demonstrating
zero
transmission.
Furthermore,
can
be
modulated
between
open
closed
states
by
applying
field,
facilitating
seamless
transition
full-band
transparency
modes.
To
expand
applications,
multilayer
gradient
impedance
matching
(M-BLH-300)
absorber
based
on
fabricated
stealth
in
microwave
bands,
achieving
strong
reflection
loss
-26.7
dB
with
effective
absorption
bandwidth
4.85
GHz.
Notably,
M-BLH-300
retains
excellent
performance
when
extended
frequency
range
further
its
suitability
multispectrum
(from
terahertz)
defense.
In
short,
this
innovative
design
concept
combining
intelligent
switches
will
guide
development
next-generation
advanced
systems.
ACS Applied Materials & Interfaces,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 4, 2025
In
the
6G
era,
miniaturized
and
highly
integrated
wearable
communications
devices
require
electromagnetic
materials
with
efficient
thermal-management
capability
to
mitigate
interference
(EMI)
heat
accumulation.
Herein,
we
present
a
facile
strategy
for
conducting
by
constructing
directional
thermal-conduction
nanochannels
within
layer-by-layer
EMI
shielding
film.
This
composite
film
consists
of
polyacrylonitrile/boron
nitride
nanosheets@polydopamine
nanofibers
covered
an
layer
based
on
MXene
sheets.
Compared
traditional
in
which
dissipates
randomly,
one-dimensional
fibrous
structure
can
offer
dissipation
pathway.
Under
high-power
microwave
irradiation,
it
exhibits
significantly
lower
temperatures,
ensuring
robust
durable
communication
performance
without
overheating.
The
thin
(0.43
mm
thickness)
achieves
impressive
specific
surface
efficiency
29,400
dB·cm2·g-1
at
18-24
GHz,
effectiveness
(SE)
88
dB
its
counterpart.
addition,
flexible
maintains
high
SE
after
10,000
bending
times.
Its
lightweight,
flexible,
design
makes
suitable
applications
various
environments.
thermally
conductive
provides
rapid
effective
signal
systems,
showcasing
great
potential
thermal
management
next-generation
technologies.
