ACS Applied Materials & Interfaces,
Journal Year:
2023,
Volume and Issue:
15(2), P. 3534 - 3542
Published: Jan. 5, 2023
Thermal
interface
materials
(TIMs),
as
typical
thermal
functional
materials,
are
highly
required
to
possess
both
high
conductivity
and
low
Young's
modulus.
However,
the
naturally
synchronized
change
in
mechanical
properties
seriously
hinders
development
of
high-performance
TIMs.
To
tackle
such
a
dilemma,
strategy
codoping
solid
fillers
liquid
metal
into
polymer
substrates
is
proposed
this
study.
This
includes
large
amount
metals
that
play
role
paths
small
uniformly
dispersed
further
enhance
heat
conduction.
Through
synergistic
effect
fillers,
can
be
improved,
modulus
kept
simultaneously.
A
TIM
with
volume
55%
gallium-based
15%
copper
particles
has
3.94
W/(m·K)
699
kPa,
which
had
maximum
thermomechanical
performance
coefficient
compared
TIMs
filler-doped
In
addition,
solid-liquid
codoped
increased
sharply
an
increase
content,
rapidly
ratio
polymer.
The
high-low-temperature
cycling
test
large-size
light-emitting
diode
(LED)
application
demonstrated
stable
physical
performance.
provides
broad
space
solve
classic
tradeoff
issue
composites.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
34(19)
Published: Jan. 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.
Nature Communications,
Journal Year:
2023,
Volume and Issue:
14(1)
Published: April 8, 2023
Harvesting
largely
ignored
and
wasted
electromagnetic
(EM)
energy
released
by
electronic
devices
converting
it
into
direct
current
(DC)
electricity
is
an
attractive
strategy
not
only
to
reduce
EM
pollution
but
also
address
the
ever-increasing
crisis.
Here
we
report
synthesis
of
nanoparticle-templated
graphene
with
monodisperse
staggered
circular
nanopores
enabling
EM-heat-DC
conversion
pathway.
We
experimentally
theoretically
demonstrate
that
this
nanoporous
structure
alters
graphene's
phononic
properties
synergistically
manipulating
its
intralayer
nanostructures
interlayer
interactions.
The
exhibits
anomalous
combination
properties,
which
lead
efficient
absorption
waves
heat
in
turn
output
DC
through
thermoelectric
effect.
Overall,
our
results
advance
fundamental
understanding
structure-property
relationships
ordered
graphene,
providing
effective
generate
electric
energy.
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
36(48)
Published: Oct. 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.
Advanced Functional Materials,
Journal Year:
2023,
Volume and Issue:
33(18)
Published: Feb. 8, 2023
Abstract
Multifunctional
films
with
integrated
temperature
adjustment,
electromagnetic
interference
(EMI)
shielding,
and
thermal
camouflage
are
remarkably
desirable
for
wearable
products.
Herein,
a
novel
Janus‐type
multifunctional
ultra‐flexible
film
is
fabricated
via
continuous
electrospinning
followed
by
spraying.
Interestingly,
in
the
polyvinyl
alcohol
(PVA)/phase
change
capsules
(PCC)
layer
(P
1
),
PCC
strung
on
PVA
fibers
to
form
stable
“candied
haws
stick”
structure
that
obviates
slipping
or
falling
off.
The
sufficient
melting
enthalpy
(141.4
J
g
−1
)
guarantees
its
thermoregulation
capability.
Simultaneously,
high
mid‐IR
emissivity
(90.15%)
endows
radiative
cooling
properties
(reducing
10.13
°C).
Mechanical
strength
significantly
improved
superimposing
polylactic
acid
(PLA)
2
surface.
By
spraying
thin
MXene
PLA
surface
of
P
film,
obtained
(MXene/P
MP
endowed
satisfactory
low‐voltage
heating,
photo‐thermal
superior
performance,
achieving
all‐season
comfort.
Impressively,
flexible
achieves
enhanced
EMI
shielding
effect
from
50.3
87.8
dB
through
simple
origami
process,
which
simplifies
manufacturing
process
high‐performance
materials.
In
brief,
an
attractive
candidate
future
products
personalized
management
anti‐electromagnetic
radiation.
Angewandte Chemie International Edition,
Journal Year:
2023,
Volume and Issue:
62(38)
Published: Aug. 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,
Journal Year:
2023,
Volume and Issue:
15(1)
Published: May 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.
Angewandte Chemie International Edition,
Journal Year:
2024,
Volume and Issue:
63(17)
Published: Feb. 9, 2024
The
development
of
highly
thermally
conductive
composites
that
combine
visible
light/infrared
camouflage
and
information
encryption
has
been
endowed
with
great
significance
in
facilitating
the
application
5G
communication
technology
military
fields.
This
work
uses
aramid
nanofibers
(ANF)
as
matrix,
hetero-structured
silver
nanowires@boron
nitride
nanosheets
(AgNWs@BNNS)
prepared
by
situ
growth
fillers,
which
are
combined
to
fabricate
sandwich
structured
electrically
insulating
(BNNS/ANF)-(AgNWs@BNNS)-(BNNS/ANF)
(denoted
BAB)
composite
films
"filtration
self-assembly,
air
spraying,
hot-pressing"
method.
When
mass
ratio
AgNWs@BNNS
BNNS
is
1
:
total
fraction
50
wt
%,
BAB
film
maximum
in-plane
thermal
conductivity
coefficient
(λ
