Polymer Composites,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 30, 2024
Abstract
The
preparation
of
lightweight
polymer‐based
composites
with
high
thermal
conductivity
is
an
urgent
requirement
for
management
applications.
In
this
work,
carbon
fiber
felt
(CFF)
three‐dimensional
(3D)
layered
structure
was
firstly
prepared
based
on
papermaking
method.
Then,
in‐plane
(TC)
Epoxy
resin/graphitized
(Epoxy/G‐CFF)
were
by
graphitized
CFF
different
layers
under
vacuum
assistance.
effect
graphitization
the
property
investigated,
and
practical
heat
transfer
behavior
analyzed.
results
show
that
Epoxy/G‐CFF
exhibit
highest
1.88
W/mK
at
8.5
wt%
loading,
which
889.47%
higher
than
pure
Epoxy.
It
represents
achievement
enhancing
performance
low
additions.
More
importantly,
still
density
strong
capability.
This
suggests
have
promising
applications
in
field.
Highlights
process
significantly
increases
grain
size
shortens
layer
spacing,
contributing
to
comprehensive
properties
G‐CFF.
loading.
Polymer Composites,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Aug. 13, 2024
Abstract
Epsilon‐negative
materials
(ENM)
at
radio
frequency,
usually
designed
based
on
percolation
theory,
recently
drew
much
attention
because
of
their
potential
applications
in
capacitors,
transistors,
and
antennas.
However,
randomly
distributed
conductive
functional
cannot
achieve
directional
long‐range
electron
transportation
within
the
material,
resulting
decreased
utilization
efficiency.
The
morphology
design
substrate
material
can
change
distribution
state
transfer
pathway
fillers.
By
controlling
size
polystyrene
(PS)
content
multi‐walled
carbon
nanotubes
(MWCNTs),
PS/MWCNTs
composites
with
random
structures
segregated
were
designed,
both
which
exhibited
negative
permittivity
increasing
MWCNTs
content.
Further
investigation
revealed
that
behavior
is
due
to
establishment
network
plasma
oscillation
free
electrons.
Moreover,
components
have
lower
thresholds,
as
transport
achieved
fillers
are
efficiently
utilized.
This
work
provides
a
new
method
for
guiding
effectively
changing
ENM.
Highlights
Negative
by
frequency.
structure
leads
decrease
threshold.
good
prospects
inductive
components.
ACS Nano,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 9, 2025
Multifunctional
materials
are
accelerating
the
development
of
soft
electronics
with
integrated
capabilities
including
wearable
physical
sensing,
efficient
thermal
management,
and
high-performance
electromagnetic
interference
shielding.
With
outstanding
mechanical,
thermal,
electrical
properties,
nanocarbon
offer
ample
opportunities
for
designing
multifunctional
devices
broad
applications.
Surface
interfacial
engineering
have
emerged
as
an
effective
approach
to
modulate
interconnected
structures,
which
may
tunable
synergistic
effects
precise
control
over
transport,
properties.
This
review
presents
a
comprehensive
summary
recent
advances
empowering
via
surface
in
context
techniques,
structural
evolution,
their
wide
Special
emphasis
is
placed
on
identifying
critical
correlations
between
structures
across
nanoscales,
microscales,
macroscales
The
challenges
currently
faced
by
examined,
potential
applications
also
revealed.
We
anticipate
that
this
will
promote
further
trigger
ideas
design
multidisciplinary
Metals
have
traditionally
served
as
the
primary
functional
phase
in
development
of
metamaterials
exhibiting
epsilon-near-zero
(ENZ)
and
epsilon-negative
(EN)
responses,
albeit
with
persisting
ambiguities
regarding
their
response
mechanisms.
This
paper
presents
tunable
ENZ
(ε'
~
0)
EN
<
parameters
at
20-MHz
to
1-GHz
region
based
on
Cu/CaCu3Ti4O12
(Cu/CCTO)
metacomposites.
By
means
first-principles
calculations
multi-physics
simulations,
underlying
mechanisms
governing
responses
are
unveiled.
The
intricate
pathways
through
which
metacomposites
achieve
2
dielectric
delineated:
At
low
Cu
content,
a
weak
(|ε'|
200)
was
excited
by
electric
dipole
resonance,
accompanied
effect;
conversely,
high
due
increase
effective
electron
concentration,
plasmonic
oscillation
behavior
occurs
constructed
3-dimensional
network,
resulting
strong
1,000)
radio
frequency
band.
These
phenomena
explicated
distinct
Cu/CCTO
models:
an
isolated
state
connected
network
state.
study
not
only
comprehensively
elucidates
achieved
typical
metals
phases
but
also
delves
into
associated
electromagnetic
shielding
thermal
properties,
providing
theoretical
basis
for
practical
applications.
Polymer Composites,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 11, 2025
Abstract
The
effectiveness
of
aramid
fiber‐reinforced
polymer
(AFRP)
composites
depends
on
a
strong
adhesion
at
the
interface
connecting
fibers
to
matrix,
which
is
essential
for
attaining
desired
high
energy
absorption
and
effective
distribution
impact
forces
in
these
materials.
Subpar
interfacial
conditions
contribute
inefficient
load
transfer
create
stress
concentrations,
potentially
diminishing
resistance
performance
causing
severe
failure.
Cellulose
nanofibers
(CNFs)
exhibit
considerable
potential
reinforcing
interfaces
within
polymeric
composite
systems
that
are
fiber‐reinforced,
owing
their
substantial
tensile
strength
modulus,
extensive
specific
surface
area,
versatile
properties.
However,
due
stable
chemical
properties
fibers,
CNFs
cannot
truly
serve
role
phase
reinforcement,
limits
application
AFRPs.
In
this
work,
we
have
adsorbed
carboxymethylated
cellulose
(CNF‐Cs)
onto
via
straightforward
efficient
dip‐coating
approach,
increasing
friction
coefficient
between
thereby
improving
internal
woven
fiber
reinforcement.
This
approach
yields
CNF‐C
enhances
efficiency
composites,
while
preserving
fibers.
treatment
yielded
9.4%
increase
12.05%
toughness.
method
strengthens
fiber‐matrix
without
reducing
fiber's
resistance.
It
offers
quick
reliable
way
enhance
AFRP
composites.
Highlights
CNF‐Cs
was
developed
Numerical
simulation
effectively
analyzed
CNF‐Cs.
capacity
materials
increased
by
9.4%.
maximum
deflection
improved
12.05%.
Polymer Composites,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 26, 2025
Abstract
In
order
to
improve
the
interfacial
properties
between
carbon
fibers
and
epoxy
resin
matrix,
this
paper
proposes
a
method
prepare
reinforced
composites
based
on
Deoxyribonucleic
acid‐Carbon
nanotubes
(DNA‐CNTs)
self‐assembled
milled
Carbon
Fibers
(mCF).
DNA
was
used
assist
functionalization
of
CNTs,
CNTs
were
uniformly
dispersed
covered
surface
by
self‐assembly
bonding
mCF
matrix.
Analyzed
scanning
electron
microscopy
(SEM)
transmission
(TEM),
it
found
that
layer
with
thickness
100–350
nm
formed
mCF,
distribution
varied
reaction
time.
The
experimental
results
showed
tensile
compressive
yield
strengths
mCF‐CNTs/EP
increased
56.36%
(69.97
MPa)
18.62%
(91.32
compared
those
pure
EP,
respectively.
Thermogravimetric
analysis
(TGA)
dynamic
mechanical
(DMA)
tests
onset
thermal
decomposition
temperature
277.28°C
an
energy
storage
modulus
6270.18
MPa,
which
48.75%
higher
than
EP.
lap
shear
test
not
only
improved
load‐bearing
capacity
but
also
exhibited
greater
displacement
under
ultimate
load,
prolonged
crack
extension
path,
enhanced
absorption
capacity.
It
is
shown
have
significant
advantages
in
improving
properties,
stability,
absorption,
wide
range
potential
applications.
Highlights
Optimal
DNA‐CNTs
time
enhances
CNT
bonding.
Self‐assembly
boosts
strength,
peaking
at
7%
25–40
min.
Improved
stability
seen
T
5%
,
modulus,
g
.
shows
better
bond
resistance.
