Sensors,
Journal Year:
2024,
Volume and Issue:
24(19), P. 6197 - 6197
Published: Sept. 25, 2024
Ion−conducting
hydrogels
show
significant
potential
in
plant
growth
monitoring.
Nevertheless,
traditional
ionic
hydrogel
sensors
experience
substantial
internal
creep
and
inadequate
sensitivity,
hindering
precise
In
this
study,
we
developed
a
flexible
sensor
composed
of
polyvinyl
alcohol
acrylamide.
The
exhibits
low
high
sensitivity.
Polyvinyl
alcohol,
acrylamide,
glycerol
are
crosslinked
to
create
robust
interpenetrating
double
network
structure.
strong
interactions,
such
as
van
der
Waals
forces,
between
the
networks
minimize
under
external
stress,
reducing
drift
ratio
by
50%
rate
more
than
60%.
Additionally,
sodium
chloride
AgNWs
enrich
with
conductive
ions
pathways,
enhancing
sensor’s
conductivity
demonstrating
excellent
response
time
(0.4
s)
recovery
(0.3
s).
When
used
for
monitoring,
sensitivity
small
strains
stability
long−term
This
establishes
foundation
developing
health
monitoring
systems
utilizing
renewable
biomass
materials.
Advanced Science,
Journal Year:
2024,
Volume and Issue:
11(39)
Published: Aug. 20, 2024
Abstract
Hydrogel
sensors
are
widely
utilized
in
soft
robotics
and
tissue
engineering
due
to
their
excellent
mechanical
properties
biocompatibility.
However,
high‐water
environments,
traditional
hydrogels
can
experience
significant
swelling,
leading
decreased
electrical
performance,
potentially
losing
shape,
sensing
capabilities.
This
study
addresses
these
challenges
by
leveraging
the
Hofmeister
effect,
coupled
with
directional
freezing
salting‐out
techniques,
develop
a
layered,
high‐strength,
tough,
antiswelling
PVA/MXene
hydrogel.
In
particular,
process
enhances
self‐entanglement
of
PVA,
resulting
an
S‐PM
hydrogel
tensile
strength
up
2.87
MPa.
Furthermore,
retains
its
structure
after
7
d
only
6%
change
resistance.
Importantly,
performance
is
improved
postswelling,
capability
rarely
achievable
hydrogels.
Moreover,
demonstrates
faster
response
times
more
stable
resistance
rates
underwater
tests,
making
it
crucial
for
long‐term
continuous
monitoring
challenging
aquatic
ensuring
sustained
operation
monitoring.
Angewandte Chemie International Edition,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Oct. 11, 2024
Abstract
Reprogrammable
shape
morphing
is
ubiquitous
in
living
beings
and
highly
crucial
for
them
to
move
normal
situations,
even
survive
under
dangerous
conditions.
There
increasing
interest
using
asymmetric
hydrogel
structures
understand
mimic
beings’
upon
an
external
trigger
a
controlled
way.
However,
these
or
heterogeneous
configurations
cannot
be
further
modified
once
the
polymer
hydrogels
are
prepared.
Therefore,
it
great
challenge
achieve
reprogrammable
existing
hydrogels.
Inspired
by
marine
amoebae,
which
transform
into
several
different
morphologies
according
various
salt
concentrations,
new
strategy
developed
salting
reconfigure
their
anisotropy
toward
morphing.
Polyampholyte
with
equal
stoichiometric
COO
−
N
+
(CH
3
)
groups
were
first
swollen
HCl/NaCl
solution.
After
being
then
transferred
water,
they
again
water
uptake
driven
osmotic
pressure,
spontaneously
deswollen
due
increase
internal
pH
dialysis
of
ions
leading
deprotonation
COOH
regeneration
/N
electrostatic
attraction.
This
work
provides
novel
soft
actuators
open
up
avenue
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
36(41)
Published: Aug. 13, 2024
Abstract
Smart
actuators
hold
great
potential
in
soft
robotics
and
sensors,
but
their
movement
at
the
fluid
interface
is
less
understood
controlled,
hindering
performances
applications
complicated
fluids.
Here
an
ethanol‐containing
polyelectrolyte
actuator
prepared
that
demonstrates
excellent
actuating
performance
via
Marangoni
effect.
These
exhibit
enduring
(17
min),
repeatable
(50
cycles),
autonomous
motion
on
water
surface.
More
importantly,
of
are
dependent
shapes.
Polygonal
with
more
edges
round
attached
to
walls
containers,
while
few
move
randomly.
On
basis
this
property,
circular
can
pass
through
pipe
bends
S‐shaped
complex
geometry.
unique
advantages
lend
successful
wireless
sensing
(standard
0–5
V
level
signals)
for
locating
obstructions
inside
invisible
pipes
continuous
energy
harvesting
(7700
nC
per
cycle)
micro
mechanical
energy.
Advanced Functional Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 5, 2025
Abstract
Hydrogels
in
water
or
aqueous
solutions
swell
shrink
unidirectionally
until
reaching
an
equilibrium
state,
which
has
been
extensively
studied
through
both
experimental
analysis
and
theoretical
prediction.
In
this
work,
unexpected
concurrent
swelling
deswelling
behavior
of
hydrogels
is
reported,
manipulates
the
state
polymer
networks.
The
osmotic
pressure‐driven
rapid
ionic
electrostatic
repulsion‐driven
slow
occur
simultaneously,
affording
double‐layered
polyacrylamide
(PAM)
hydrogels,
rigid
inner
layer
does
not
contains
free
water,
while
soft
outer
comprises
bound
water.
PAM
show
uniaxial
tensile
fracture
strengths
Young's
moduli
up
to
104.2
MPa
2.4
GPa,
respectively,
outperforming
various
polymeric
biological
structural
materials.
This
strategy
applicable
general
molding
three‐dimensional
(3D)
printing
techniques,
providing
wide
possibilities
for
engineering
applications.
Such
strong
can
simultaneously
serve
as
materials
load‐bearing
act
functional
super‐stress
(25
6000
N)
highly
adaptable
tactile
sensing.
These
findings
enrich
hydrogel
swell/deswelling
theory
broaden
applications
Advanced Optical Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 8, 2025
Abstract
Information
security
is
of
predominant
significance,
while
multiple
logic
information
encryption
techniques
remain
challenging.
Here
it
reported
that
upon
coupling
the
unduplicable
Jun
Porcelain‐like
birefringence
and
enables
polarized
fluorescence
with
solid
phase
molecular
self‐assembly(SPMSA),
can
be
achieved
correctly
applying
UV
light
polarizing
angles.
Since
each
unique
transformed
into
a
corresponding
digital
bar
code,
further
encrypted
assistance
code
bank,
thus
yielding
ultimate
security.
