Applied Physics Letters,
Journal Year:
2023,
Volume and Issue:
123(16)
Published: Oct. 16, 2023
Pulse
power
has
many
important
technological
applications,
for
which
the
dielectric
capacitors
are
essential.
It
is
imperative
to
understand
breakdown
mechanism
improve
energy
storage
density,
yet
process
involves
multi-physical
coupling
spanning
multiple
spatial
and
temporal
scales,
making
its
characterization
very
challenging.
Recognizing
local
field
concentration
results
in
strain
through
Maxwell's
stress,
we
develop
an
effective
method
visualize
via
optic
measurement.
Utilizing
high-performance
biaxially
oriented
polypropylene
as
a
demonstration,
find
ultrafast
with
current
rising
dropping
just
tens
of
nanoseconds.
Rapid
temperature
rise
observed
after
well
due
Joule
heating,
though
both
measurement
mapping
offer
little
insight
before
actually
occurs.
Nevertheless,
substantial
breakdown,
reflecting
electric
that
eventually
leads
breakdown.
A
well-defined
upper
bound
on
also
noted.
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
36(26)
Published: April 4, 2024
Continuous
monitoring
of
blood
pressure
(BP)
and
multiparametric
analysis
cardiac
functions
are
crucial
for
the
early
diagnosis
therapy
cardiovascular
diseases.
However,
existing
approaches
often
suffer
from
bulky
intrusive
apparatus,
cumbersome
testing
procedures,
challenging
data
processing,
hampering
their
applications
in
continuous
monitoring.
Here,
a
heterogeneously
hierarchical
piezoelectric
composite
is
introduced
wearable
BP
function
monitoring,
overcoming
rigidity
ceramic
insensitivity
polymer.
By
optimizing
structure
components
composite,
developed
sensor
delivers
impressive
performances,
ensuring
accurate
at
Grade
A
level.
Furthermore,
hemodynamic
parameters
extracted
detected
signals,
such
as
local
pulse
wave
velocity,
output,
stroke
volume,
all
which
alignment
with
clinical
results.
Finally,
all-day
tracking
validates
reliability
stability
sensor,
highlighting
its
potential
personalized
healthcare
systems,
particularly
timely
intervention
disease.
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
36(28)
Published: March 23, 2024
In
this
work,
a
distinctive
"metal-ion
organic
hybrid
interface"
(MOHI)
between
polyimide
(PI)
and
calcium
niobate
(CNO)
nanosheets
is
designed.
The
metal
ions
in
the
MOHI
can
achieve
atomic-level
matching
not
only
with
inorganic
CNO,
but
also
PI
chains,
forming
uniform
strong
chemical
bonds.
These
results
are
demonstrated
by
experiment
theory
calculations.
Significantly,
reduces
free
volume
introduces
deep
traps
across
filler-matrix
interfacial
area,
thus
suppressing
electric
field
distortion
PI-based
composite
dielectrics.
Consequently,
dielectric
containing
exhibits
excellent
energy
storage
performance.
densities
(U
Journal of Materials Chemistry A,
Journal Year:
2023,
Volume and Issue:
11(37), P. 20089 - 20101
Published: Jan. 1, 2023
The
interfacial
polarization-couples
Schottky
barrier
height
between
BT
particles
and
the
C8P2
matrix
strongly
enhanced
energy
storage
capacity
of
this
cellulose-based
flexible
capacitors.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: June 14, 2024
Abstract
Establishing
a
harmonious
equilibrium
between
high
energy
storage,
minimal
loss,
and
exceptional
processability
presents
formidable
challenge
within
the
realm
of
dielectric
polymers.
To
address
this
challenge,
harnessing
characteristics
long‐chain
side
groups
to
enhance
polarity
toughness,
as
well
fluorine
effect
improve
insulation
efficiency,
random
copolymer,
poly(4‐fluorostyrene‐trifluoroethyl
methacrylate)
(P(FS‐3FEMA)),
is
successfully
synthesized
via
copolymerization
fluorine‐containing
monomers,
namely
4‐fluorostyrene
(FSt)
trifluoroethyl
methacrylate
(3FEMA).
Experimental
findings
demonstrate
that
elongating
chains
enhances
polymer
boosts
polarization
strength,
self‐healing
capacity.
Introducing
atoms
into
maintains
toughness
while
marginally
increasing
chain
spacing,
reducing
relaxation
loss
induced
by
dipole
reorientation
under
an
applied
electric
field.
Additionally,
incorporation
electron
capture,
effectively
leakage
likelihood
thermal
electrical
breakdown.
Ultimately,
copolymer
exhibits
performance,
characterized
extraordinarily
storage
(
U
e
=
18.3
J
cm
−3
),
(efficiency
exceeding
89%),
enhanced
(increased
over
112%).
This
study
novel
approach
harnesses
reconcile
conflicting
requirements
in
dielectrics.
Advanced Functional Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 16, 2025
Abstract
To
meet
the
increasing
demands
of
modern
power
electronics
for
high‐temperature
resistance
and
energy
storage
performance
avoid
trade‐off
between
high
(
U
e
)
prominent
processability,
a
strategy
to
modify
polypropylene
(PP)
by
introducing
polar
electron‐deficient
8‐hydroxyquinoline
(8‐HQ)
physically
during
melt
extrusion
granulation
is
proposed.
8‐HQ
molecules
are
initially
designed
capture
charges
injected
under
electric
field
depress
leakage
current
density.
Unexpectedly,
they
found
reside
at
PP
grain
boundaries,
promoting
growth
thereby
enhancing
films'
mechanical
strength.
Both
effects
may
address
enhanced
breakdown
strength
E
b
up
814
MV
m
−1
.
Besides,
increases
permittivity
modified
films.
Due
simultaneously
dielectric
constant,
an
impressive
9.87
J
cm
−
3
with
discharge
efficiency
above
90%
obtained
in
optimal
sample,
6.96
83%
well
retained
125
°C,
far
exceeding
previously
reported
results.
This
study
offers
novel
film
manipulating
its
crystalline
behavior
high‐pulse
capacitor
applications.
Materials Horizons,
Journal Year:
2023,
Volume and Issue:
11(3), P. 726 - 736
Published: Nov. 17, 2023
Enhancing
the
high
electric
field
resistance
and
energy
storage
capacity
of
polymer
dielectrics
has
been
a
long-standing
challenge
for
iterations
power
equipment.
Synergistic
inhibition
carrier
injection
transport
is
vital
to
performance
improvement.
Herein,
promising
polyetherimide
(PEI)
was
employed
as
matrix
wider
bandgap
boron
nitride
nanosheets
(BNNSs)
were
used
reinforcing
filler.
Utilizing
high-throughput
stochastic
breakdown
simulations
with
distribution
characteristics
BNNSs
parameters,
series
topological
gradient
structures
potential
enhance
obtained,
thereby
shortening
experimental
cycle.
Changing
BNNS
symmetric/asymmetric
positive/inverse
gradients,
well
total
contents
BNNSs,
means
that
position
condition
surface
barrier
layer
central
hinder
change,
which
influences
at
room
temperature
temperature.
Remarkably,
asymmetric
structure
composite
exhibited
excellent
performances.
Among
them,
PEI-based
dielectric
2
vol%
inverse
(gradient
content
1
vol%)
achieved
densities
8.26
4.78
J
cm
