Nano-Micro Letters,
Год журнала:
2023,
Номер
15(1)
Опубликована: Апрель 7, 2023
Highly
ordered
and
uniformly
porous
structure
of
conductive
foams
is
a
vital
issue
for
various
functional
purposes
such
as
piezoresistive
sensing
electromagnetic
interference
(EMI)
shielding.
With
the
aids
Kevlar
polyanionic
chains,
thermoplastic
polyurethane
(TPU)
reinforced
by
aramid
nanofibers
(ANF)
with
adjustable
pore-size
distribution
were
successfully
obtained
via
non-solvent-induced
phase
separation.
In
this
regard,
most
outstanding
result
in
situ
formation
ANF
TPU
after
protonation
polyanion
during
NIPS
process.
Furthermore,
growth
copper
nanoparticles
(Cu
NPs)
on
TPU/ANF
was
performed
according
to
electroless
deposition
using
tiny
amount
pre-blended
Ti3C2Tx
MXene
reducing
agents.
Particularly,
existence
Cu
NPs
layers
significantly
promoted
storage
modulus
2,932%
increments,
well-designed
TPU/ANF/Ti3C2Tx
(PAM-Cu)
composite
showed
distinguished
compressive
cycle
stability.
Taking
virtues
highly
elastic
architectures,
PAM-Cu
utilized
sensor
exhibiting
board
interval
0-344.5
kPa
(50%
strain)
good
sensitivity
at
0.46
kPa-1.
Meanwhile,
displayed
remarkable
EMI
shielding
effectiveness
79.09
dB
X
band.
This
work
provides
an
ideal
strategy
fabricate
recovery
excellent
performance,
which
can
be
used
promising
candidate
integration
satisfactory
applications
human-machine
interfaces.
Advanced Functional Materials,
Год журнала:
2024,
Номер
34(19)
Опубликована: Янв. 9, 2024
Abstract
The
trends
of
miniaturization,
lightweight,
and
high
integration
in
electronics
have
brought
serious
issues
heat
dissipation
electromagnetic
compatibility
also
limited
the
simultaneous
use
thermally
conductive
microwave
absorption
materials.
Therefore,
it
is
imperative
to
design
materials
that
possess
those
dual
functions.
In
this
work,
one‐pot
method
used
anchor
zeolitic
imidazolate
framework
ZIF‐67
coated
with
polydopamine
(PDA)
on
boron
nitride
(BN)
obtain
BN@ZIF‐67@PDA.
pyrolysis
product
BN@Co‐C@C
as
heterostructured
conductive/microwave
fillers
blended
polyethylene
terephthalate
(PET)
prepare
BN@Co‐C@C/PET
composites.
When
mass
ratio
BN
ZIF‐67@PDA
7.5:1
fraction
7.5
@Co‐C@C
45
wt%,
@Co‐C@C/PET
composites
exhibit
excellent
thermal
conductivities
performances.
conductivity
coefficient
5.37
W
m
−1
K
,
which
35.8
times
higher
than
PET
(0.15
),
wt%
(BN
/Co‐C@C)/PET
(4.03
)
prepared
by
directly
mixing.
minimum
reflection
loss
are
−63.1
dB
at
4.72
GHz,
corresponding
effective
bandwidth
1.28
GHz
(4.08–5.36
GHz),
achieving
performance
C
band.
Advanced Functional Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Фев. 13, 2024
Abstract
The
demand
for
low‐frequency
microwave
absorption
materials
is
becoming
more
and
urgent.
Novel
shape
anisotropy
chain‐like
CoNi
fabricated
using
polyvinylpyrrolidone
as
a
shape‐directing
agent
via
solvothermal
method,
which
then
mixed
with
polydimethylsiloxane
(PDMS)
to
prepare
corresponding
multifunctional
CoNi/PDMS
composite
films.
Shape
strong
magnetic
coupling
effect
of
enhance
natural
resonance
loss
capability.
minimum
reflection
(RL
min
)
−50.5
dB
effective
bandwidth
(EAB)
1.04
GHz
(2.64–3.68
GHz)
at
3.9
mm
CoNi.
18
vol%
films
present
optimal
performance
RL
−56.7
EAB
(2.96–4.00
4.1
mm,
far
superior
spherical
−9.5
dB.
Meantime,
the
in‐plane
inter‐plane
thermal
conductivity
coefficients
are
2.05
0.61
W
m
−1
K
,
about
1.5
times
higher
than
(1.36
0.42
),
also
220%
190%
pure
PDMS
(0.64
0.21
).
This
can
broaden
applications
in
5G
communications
flexible
electronics.
Abstract
Stealth
technology
is
used
to
enhance
the
survival
of
military
equipment
in
field
surveillance,
as
it
utilizes
a
combination
techniques
render
itself
undetectable
by
enemy
radar
systems.
Radar
absorbing
materials
(RAMs)
are
specialized
reduce
reflection
(or
absorption)
signals
provide
stealth
capability,
which
core
component
passive
countermeasures
applications.
The
properties
RAMs
can
be
optimized
adjusting
their
composition,
microstructure,
and
surface
geometry.
Carbon‐based
present
promising
approach
for
fabrication
ultrathin,
versatile,
high‐performance
due
large
specific
area,
lightweight,
excellent
dielectric
properties,
high
electrical
conductivity,
stability
under
harsh
conditions.
This
review
begins
with
brief
history
an
introduction
electromagnetic
waves,
systems,
materials.
followed
discussion
recent
research
progress
carbon‐based
RAMs,
including
carbon
blacks,
fibers,
nanotubes,
graphite,
graphene,
MXene,
along
in‐depth
examination
principles
strategies
on
attenuation
characteristics.
Hope
this
will
offer
fresh
perspectives
design
thereby
fostering
deeper
fundamental
understanding
promoting
practical
Nano-Micro Letters,
Год журнала:
2023,
Номер
16(1)
Опубликована: Ноя. 23, 2023
The
utilization
of
eco-friendly,
lightweight,
high-efficiency
and
high-absorbing
electromagnetic
interference
(EMI)
shielding
composites
is
imperative
in
light
the
worldwide
promotion
sustainable
manufacturing.
In
this
work,
magnetic
poly
(butyleneadipate-co-terephthalate)
(PBAT)
microspheres
were
firstly
synthesized
via
phase
separation
method,
then
PBAT
composite
foams
with
layered
structure
was
constructed
through
supercritical
carbon
dioxide
foaming
scraping
techniques.
merits
integrating
ferroferric
oxide-loaded
multi-walled
nanotubes
(Fe
Advanced Materials,
Год журнала:
2024,
Номер
36(48)
Опубликована: Окт. 9, 2024
Abstract
The
advancement
of
thin,
lightweight,
and
high‐power
electronic
devices
has
increasingly
exacerbated
issues
related
to
electromagnetic
interference
heat
accumulation.
To
address
these
challenges,
a
spray‐drying‐sintering
process
is
employed
assemble
chain‐like
CoNi
flake
boron
nitride
(BN)
into
hydrangea‐like
CoNi@BN
heterostructure
fillers.
These
fillers
are
then
composited
with
polydimethylsiloxane
(PDMS)
develop
CoNi@BN/PDMS
composites,
which
integrate
low‐frequency
microwave
absorption
thermal
conductivity.
When
the
volume
fraction
44
vol%
mass
ratio
BN
3:1,
composites
exhibit
optimal
performance
in
both
achieve
minimum
reflection
loss
−49.9
dB
effective
bandwidth
2.40
GHz
(3.92–6.32
GHz)
at
thickness
4.4
mm,
fully
covering
n79
band
(4.4–5.0
for
5G
communications.
Meanwhile,
in‐plane
conductivity
(
λ
∥
)
7.31
W
m
−1
K
,
≈11.4
times
(0.64
pure
PDMS,
32%
higher
than
that
(CoNi/BN)/PDMS
(5.52
same
obtained
through
direct
mixing.
Angewandte Chemie International Edition,
Год журнала:
2023,
Номер
62(38)
Опубликована: Авг. 7, 2023
The
positive
liquid
crystals,
4'-heptyl-4-biphenylcarbonitrile
(7CB),
are
used
to
functionalize
carbon
nanotubes
(LC-CNT),
which
can
be
aligned
in
the
crystalline
polyimide
(LC-PI)
matrix
under
an
alternating
electric
field
fabricate
thermally
conductive
LC-CNT/LC-PI
composite
films.
efficient
establishment
of
thermal
conduction
pathways
films
with
a
low
amount
LC-CNT
is
achieved
through
oriented
alignment
within
LC-PI
matrix.
When
mass
fraction
15
wt
%,
in-plane
conductivity
coefficient
(λ∥
)
and
through-plane
(λ⊥
reach
4.02
W/(m
⋅
K)
0.55
W/(m⋅K),
90.5
%
71.9
higher
than
those
intrinsically
respectively,
also
28.8
5.8
CNT/LC-PI
respectively.
Meanwhile,
possess
excellent
mechanical
heat
resistance
properties.
Young's
modulus
index
2.3
GPa
297.7
°C,
same
CNT.
Nano-Micro Letters,
Год журнала:
2023,
Номер
15(1)
Опубликована: Май 28, 2023
Although
multifunctional
aerogels
are
expected
to
be
used
in
applications
such
as
portable
electronic
devices,
it
is
still
a
great
challenge
confer
multifunctionality
while
maintaining
their
inherent
microstructure.
Herein,
simple
method
proposed
prepare
NiCo/C
with
excellent
electromagnetic
wave
absorption
properties,
superhydrophobicity,
and
self-cleaning
by
water-induced
NiCo-MOF
self-assembly.
Specifically,
the
impedance
matching
of
three-dimensional
(3D)
structure
interfacial
polarization
provided
CoNi/C
well
defect-induced
dipole
primary
contributors
broadband
absorption.
As
result,
prepared
have
width
6.22
GHz
at
1.9
mm.
Due
presence
hydrophobic
functional
groups,
improve
stability
humid
environments
obtain
hydrophobicity
large
contact
angles
>
140°.
This
aerogel
has
promising
absorption,
resistance
water
or
environments.
