Ultrasonics Sonochemistry,
Год журнала:
2024,
Номер
111, С. 107148 - 107148
Опубликована: Ноя. 10, 2024
The
ultrasonic
micromachining
systems
significantly
improve
machining
efficiency
and
quality,
which
are
increasingly
being
applied
in
the
manufacturing
of
microstructures
micro
parts.
However,
mechanical
thermal
loads
high-frequency
piezoelectric
transducer
(HPUT)
have
serious
interference
with
precise
control
resonance
frequency
tracking,
further
causes
uncontrollable
processing
quality
precision.
To
controllability
a
thermo-mechanical
coupling
load
model
for
HPUTs
is
proposed
to
establish
relationship
between
by
introducing
force
constants
into
6-terminal
network
electromechanical
equivalent
circuit.
experimental
results
show
that
can
accurately
predict
trend
when
under
axial
range
0-10
N
temperature
35-60°C.
ACS Applied Materials & Interfaces,
Год журнала:
2023,
Номер
15(35), С. 41806 - 41816
Опубликована: Авг. 23, 2023
Over
the
past
few
decades,
flexible
piezoelectric
devices
have
gained
increasing
interest
due
to
their
wide
applications
as
wearable
sensors
and
energy
harvesters.
Poly(vinylidene
fluoride-trifluoroethylene)
(PVDF-TrFE),
one
of
polymers,
has
caught
considerable
attention
because
its
high
flexibility,
thermal
stability,
biocompatibility.
However,
relatively
lower
piezoelectricity
limits
broader
applications.
Herein,
we
present
a
new
approach
improving
PVDF-TrFE
nanofibers
by
integrating
barium
titanate
(BTO)
nanoparticles.
Instead
being
directly
dispersed
into
nanofibers,
BTO
nanoparticles
were
electrosprayed
between
nanofiber
layers
create
sandwich
structure.
The
results
showed
that
sample
with
sandwiched
much
higher
output
compared
uniformly
in
maximum
∼
457%
enhancement.
Simulation
suggested
enhanced
is
larger
strain
induced
Additionally,
might
be
better
poled
during
electrospraying
field
strength,
which
also
believed
contribute
piezoelectricity.
potential
mats
sensor
for
measuring
biting
force
array
pressure
mapping
was
demonstrated.
Advanced Materials,
Год журнала:
2024,
Номер
36(33)
Опубликована: Июнь 14, 2024
Recent
breakthroughs
in
defect-engineered
lead-free
piezoelectric
ceramics
have
reported
remarkable
electrostrain
values,
surpassing
the
limit
of
lattice
distortion.
This
has
aroused
wide
concern
on
bending
deformation
and
associated
underlying
mechanism.
Herein,
via
designing
with
varying
volatilization
characteristics,
it
is
uncovered
that
ultrahigh
electrobending
primarily
attributed
to
a
large
strain
gradient
induced
by
unevenly
distributed
defect
dipoles.
In
0.5
mm
thick
Sr/Sn
co-doped
potassium
sodium
niobate
featuring
volatile
K/Na
elements,
inherent
bipolar
value
can
reach
0.3%
at
20
kV
cm
ACS Applied Materials & Interfaces,
Год журнала:
2024,
Номер
16(9), С. 11740 - 11748
Опубликована: Фев. 23, 2024
With
the
rapid
development
of
human–machine
interactions
and
artificial
intelligence,
demand
for
wearable
electronic
devices
is
increasing
uncontrollably
all
over
world;
however,
an
unsustainable
power
supply
such
sensors
continues
to
restrict
their
applications.
In
present
work,
piezoelectric
barium
titanate
(BaTiO3)
ceramic
powder
with
excellent
properties
was
prepared
from
milled
precursors
through
a
solid-state
reaction.
To
fabricate
flexible
device,
as-prepared
BaTiO3
mixed
polydimethylsiloxane
(PDMS)
polymer.
The
BaTiO3/PDMS
ink
rheological
extruded
smoothly
by
direct
writing
technology
(DIW).
particles
were
aligned
due
shear
stress
effect
during
printing
process.
Subsequently,
as-printed
composite
assembled
into
sandwich-type
device
effective
energy
harvesting.
It
observed
that
maximum
output
voltage
current
this
reached
68
V
720
nA,
respectively,
content
6
vol
%.
Therefore,
material
extrusion-based
three-dimensional
(3D)
technique
can
be
used
prepare
composites
efficient
Advanced Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Сен. 18, 2024
Abstract
Piezoelectric
energy
harvesting
captures
mechanical
from
a
number
of
sources,
such
as
vibrations,
the
movement
objects
and
bodies,
impact
events,
fluid
flow
to
generate
electric
power.
Such
power
can
be
employed
support
wireless
communication,
electronic
components,
ocean
monitoring,
tissue
engineering,
biomedical
devices.
A
variety
self‐powered
piezoelectric
sensors,
transducers,
actuators
have
been
produced
for
these
applications,
however
approaches
enhance
properties
materials
increase
device
performance
remain
challenging
frontier
research.
In
this
regard,
intrinsic
polarization
designed
or
deliberately
engineered
piezo‐generated
This
review
provides
insights
into
mechanisms
piezoelectricity
in
advanced
materials,
including
perovskites,
active
polymers,
natural
biomaterials,
with
focus
on
chemical
physical
strategies
piezo‐response
facilitate
their
integration
complex
systems.
Applications
soft
robotics
are
overviewed
by
highlighting
primary
figures
merits,
actuation
mechanisms,
relevant
applications.
Key
breakthroughs
valuable
further
improve
both
discussed,
together
critical
assessment
requirements
next‐generation
systems,
future
scientific
technological
solutions.
The Journal of Physical Chemistry C,
Год журнала:
2024,
Номер
128(1), С. 658 - 666
Опубликована: Янв. 2, 2024
The
contributions
to
the
piezoelectric
coefficient
d33
from
intrinsic
contribution,
reversible
low-field
domain
wall
vibration,
and
irreversible
switching
displacement
of
walls
have
been
quantitatively
investigated
in
potassium
sodium
niobate
(KNN)
ceramics
with
different
phase
structures.
By
measuring
at
a
large
field
hysteresis
under
subswitching
conditions
following
Rayleigh
relations,
intrinsic/extrinsic
reversible/irreversible
responses
are
studied
understand
role
boundaries
enhancing
piezoelectricity.
This
lattice
strongly
dependent
on
crystal
structures
examined
ceramics.
intrinsic,
extrinsic,
extrinsic
coefficients
can
both
be
enhanced
instability
regime
for
KNN-based
With
respect
contribution
ratio,
an
orthorhombic-tetragonal
(O-T)
region
larger
values
as
compared
those
having
orthorhombic
(O)/rhombohedral-orthorhombic-tetragonal
(R-O-T)/rhombohedral-tetragonal
(R-T)
regions.
For
KNN
ceramics,
response
is
major
contributor
high
Strongly
linked
temperature,
O/O-T/R-O-T
phases
decrease
first
then
increase
near
transition
temperature
O
T
range,
opposite
tendency
R-T
phases.
The Journal of Physical Chemistry C,
Год журнала:
2024,
Номер
128(5), С. 2130 - 2146
Опубликована: Янв. 31, 2024
Barium
titanate
(BaTiO3)
and
its
derivatives,
which
belong
to
the
family
of
perovskite
oxides,
offer
a
class
lead
(Pb)-free
ferroelectric
piezoelectric
materials
with
numerous
applications
in
electronic
electromagnetic
devices.
In
this
study,
we
report
on
Pb-free
variable
composition
(1
–
x)BZT5–(x)BCT8
(x
=
0.00–1.00)
where
BZT5
refers
BaZr0.05Ti0.95O3
BCT8
Ba0.92Ca0.08TiO3.
The
substitution
Zr4+
for
Ti4+
Ca2+
Ba2+
BaTiO3
matrix
enhances
properties
performance
desirable
involving
capacitors
memory
storage
X-ray
diffraction
(XRD)
studies
coupled
Rietveld
refinement
analyses
confirm
biphasic
(major
tetragonal
minor
orthorhombic)
crystal
structure
all
samples.
Raman
spectroscopic
corroborate
XRD
results
validate
structure.
Chemically
homogeneous
samples
exhibit
characteristic
granular-dense
microstructure.
density
measurements
using
Archimedes'
principle
indicate
that
sample
is
above
5.31
g/cm3
(90%).
Ferroelectric
display
typical
polarization-electric
field
(P–E)
hysteresis,
confirming
nature
electric
field-induced
strain
butterfly
(S–E)
loops,
dielectric
compositions
significant
prospects
future
capacitor
applications.
show
exhibits
maximum
value
0.70
squareness
ratio,
indicating
can
be
suitable
material
permanent
random-access
(Fe-RAM)
applications,
whereas
0.75BZT5–0.25BCT8
switching
moderately
higher
remnant
polarization
(Pr
11.22
μC/cm2)
lower
coercive
(Ec
2.54
kV/cm)
are
obtained
BCT8.
coefficient
x
0.50
converse
430
±
1
pm/V
0.179
(%
strain).
Q-factor
was
observed
4.13
×
10–4
(cm2/μC)2,
among
studied
compositions,
suggesting
may
candidate
energy
conversion
transducer
