ACS Applied Materials & Interfaces,
Journal Year:
2024,
Volume and Issue:
16(28), P. 36821 - 36831
Published: July 2, 2024
In
recent
years,
flexible
strain
sensors
have
gradually
come
into
our
lives
due
to
their
superiority
in
the
field
of
biomonitoring.
However,
these
still
suffer
from
poor
durability,
high
hysteresis,
and
difficulty
calibration,
resulting
great
hindrance
practical
application.
Herein,
starting
with
interfacial
interaction
regulation
structure-induced
cracking,
performance
are
successfully
fabricated.
this
strategy,
dopamine
treatment
is
used
enhance
bonding
between
substrates
carbon
nanotubes
(CNT).
The
combination
within
conductive
networks
then
controlled
by
substituting
CNT
type.
Braid-like
fibers
employed
achieve
controllable
expansion
layer
cracks.
Finally,
we
obtain
that
possess
linearity
(R2
=
0.997)
low
hysteresis
(5%),
sensitivity
(GF
60)
wide
sensing
range
(0-50%),
short
response
time
(62
ms),
outstanding
stability,
repeatability
(>10,000
cycles).
Flexible
all
performances
good
rarely
reported.
Static
dynamic
respiration
pulse
signal
monitoring
fiber
sensor
demonstrated.
Moreover,
a
knee
joint
system
constructed
for
various
walking
stances,
which
value
diagnosis
rehabilitation
many
diseases.
Polymer,
Journal Year:
2024,
Volume and Issue:
303, P. 127120 - 127120
Published: May 1, 2024
A
piezoresistive
flexible
strain
sensor
was
developed
using
thermoplastic
polyurethane
elastomers
(TPU)
as
the
matrix
and
carbon
nanotubes
(CNTs)
conductive
fillers.
Sensitivity,
range,
tensile
cycling
stability
were
concurrently
considered
during
its
design.
Electrospun
TPU
fiber
membranes
prepared
via
electrospinning
in
this
experiment,
with
controllable
diameter
achieved
by
adjusting
rotational
speed
of
receiving
drum.
CNTs
incorporated
into
a
polymer
substrate
through
suction
filtration
to
create
sensor.
The
support
structure
electrospun
film
served
carrier
for
uniformly
adhering
particles.
Well-dispersed
could
more
easily
achieve
uniform
loading
pore
size
film,
thereby
forming
layer.
This
study
initially
determined
influence
content
spinning
solution
on
morphology
membrane.
Subsequently,
effects
CNT
drum
microstructure
investigated,
along
their
impact
microstructure,
mechanical
properties,
sensing
performance
CNTs/TPU
(CT)
sensors.
results
indicate
that
membrane
under
conditions
mass
fraction
20
wt%
100
r/min
has
larger
average
stable
scaffold
structure.
sensor,
filtering
10
mL
concentration
2
mg/mL,
exhibited
best
strength
elongation
at
break
6.22
MPa
575%,
respectively.
Additionally,
it
demonstrated
high
sensitivity
(GF=420.17
200%
strain)
excellent
durability
(300
cycle
tests),
enabling
quick
accurate
responses
movements
various
parts
human
body,
meeting
basic
usage
requirements
International Journal of Biological Macromolecules,
Journal Year:
2024,
Volume and Issue:
278, P. 134383 - 134383
Published: Aug. 3, 2024
Based
on
the
basic
idea
of
expanding
interlayer
spacing
MXene,
utilizing
effect
gallic
acid-modified
cellulose
nanofibers
for
rapid
moisture
separation,
flexible
sensing
and
driving
composite
film
with
a
perfect
balance
among
humidity
signal
response
mechanical
properties
was
prepared.
Inspired
by
stacking
autumn
fallen
leaves,
nanofibers-based
films
were
formed
self-assembly
under
vacuum
filtration
blending
MXene.
The
enhanced
(tensile
strength
131.1
MPa,
puncture
load
0.88
N,
tearing
165.55
N/mm,
elongation
at
break
16.14
%),
(the
stable
induced
voltage
63.7
mV
response/recovery
time
3.2/5.1
s),
(154.7°
bending
angle)
observed.
synergistic
hydrogen
bonds,
"pinning
effect"
arising
from
side
chains,
hierarchical
layered
microstructure
contributed
to
performance.
This
work
exemplifies
application
green
natural
product
preparing
intelligent
sensing,
wearable
devices,
biomimetic
robots.
Journal of Polymer Science,
Journal Year:
2024,
Volume and Issue:
62(20), P. 4599 - 4611
Published: July 19, 2024
Abstract
As
a
soft
material
with
biocompatibility
and
stimulation
response,
ionic
conductive
hydrogel‐based
wearable
strain
sensors
show
great
potential
across
wide
spectrum
of
engineering
disciplines,
but
their
mechanical
toughness
is
limited
in
practical
applications.
In
this
study,
freeze‐thawing
techniques
were
utilized
to
fabricate
double‐network
hydrogels
poly(vinyl
alcohol)/polyacrylamide
(PVA/PAM)
both
covalent
physical
cross‐linking
networks.
These
demonstrate
excellent
performance,
an
elongation
at
break
2253%
tensile
strength
268.2
kPa.
Simultaneously,
they
also
display
high
sensitivity
(Gage
factor,
GF
=
2.32
0%–200%
strain),
achieve
rapid
response
time
368
ms
without
the
addition
extra
fillers
or
ions,
stable
signal
transmission
even
after
multiple
cycles,
fast
human
motion
detection.
