Abstract
Hydrogel‐based
sensors
are
recognized
as
key
players
in
revolutionizing
robotic
applications,
healthcare
monitoring,
and
the
development
of
artificial
skins.
However,
primary
challenge
hindering
commercial
adoption
hydrogel‐based
is
their
lack
high
stability,
which
arises
from
water
content
within
hydrogel
structure,
leading
to
freezing
at
subzero
temperatures
drying
issues
if
protective
layer
compromised.
These
factors
result
a
significant
decline
benefits
offered
by
aqueous
gel
electrolytes,
particularly
terms
mechanical
properties
conductivity,
crucial
for
flexible
wearable
electronics.
Previous
reports
have
highlighted
several
disadvantages
associated
with
using
cryoprotectant
co‐solvents
lower
ion‐doped
anti‐freezing
sensors.
In
this
study,
design
optimization
photocrosslinkable
ionic
utilizing
silk
methacrylate
novel
natural
crosslinker
presented.
This
innovative
demonstrates
significantly
enhanced
properties,
including
stretchability
(>1825%),
tensile
strength
(2.49
MPa),
toughness
(9.85
MJ
m
–
3
),
resilience
(4%
hysteresis),
compared
its
non‐ion‐doped
counterpart.
Additionally,
exhibits
exceptional
nonfreezing
behavior
down
−85°C,
anti‐drying
functional
stability
up
2.5
years,
signal
drift
only
5.35%
over
2450
cycles,
whereas
control
variant,
resembling
commonly
reported
hydrogels,
149.8%.
The
successful
application
developed
advanced
robotics,
combined
pioneering
demonstration
combinatorial
commanding
single
sensor,
could
potentially
revolutionize
sensor
design,
elevating
it
next
level
benefiting
various
fields.
image
Advanced Functional Materials,
Год журнала:
2023,
Номер
34(13)
Опубликована: Дек. 14, 2023
Abstract
Artificial
electronic
skin
(E‐skin),
a
class
of
promising
materials
mimicking
the
physical‐chemical
and
sensory
performance
human
skin,
has
gained
extensive
interest
in
field
health‐monitoring
robotic
skins.
However,
developing
E‐skin
simultaneously
achieving
high
resilience,
hysteresis‐free,
absent
external
power
is
always
formidable
challenge.
Herein,
liquid‐free
eutectic
gel‐based
self‐powered
with
fatigue
resistance,
conductivity
prepared
by
introducing
hydroxypropyl
cellulose
(HPC)
into
metal
salt‐based
deep
solvents
(MDES).
The
unique
structural
design
cellulose‐anchored
permanent
entangled
poly(acrylic
acid)
(PAA)
chain,
combination
rapid
broken/reconstruction
dense
dynamic
sacrificial
bonds,
realizes
fabrication
high‐elastic
negligible
hysteresis.
This
further
demonstrates
practical
application
cellulose‐based
eutectogel
transmittance
(92%),
(36.6
mS
m
−1
),
resilience
(98.1%),
excellent
environment
stability
robust
triboelectric
nanogenerator
for
energy
harvesting
health‐caring
human‐machine
interaction.
Energy & Environmental Science,
Год журнала:
2024,
Номер
17(7), С. 2406 - 2430
Опубликована: Янв. 1, 2024
This
review
conducts
a
comprehensive
survey
of
the
high-entropy
effect
on
key
properties
electrolytes.
The
applications
electrolytes
in
various
rechargeable
batteries
are
presented
to
address
their
critical
drawbacks.
Advanced Functional Materials,
Год журнала:
2024,
Номер
34(48)
Опубликована: Июль 25, 2024
Abstract
Cellulose
consists
of
a
natural,
rigid
polymer
that
is
widely
used
to
improve
the
mechanical
and
water‐holding
properties
hydrogels.
However,
its
abundant
hydroxyl
groups
make
it
highly
absorbent
free
water,
leading
swelling
behavior.
This
increased
water
content
will
also
decrease
adhesive
performance.
In
this
study,
cellulose
successfully
hydrophobically
modified
reduce
absorption
water.
Gelatin
then
cross‐linked
with
through
Schiff‐base
reaction,
resulting
in
bound
content.
significantly
enhances
resistance
permeability,
improves
freeze–thaw
stability
hydrogel.
Due
internal
hydrophobicity,
molecules
can
quickly
penetrate
into
interior,
reducing
their
residence
time
on
hydrogel
surface.
allows
maintain
high
adhesion
natural
environments,
achieving
an
strength
up
3.0
MPa
wood
bamboo‐based
materials.
The
retain
even
after
prolonged
exposure
humid
environment.
Additionally,
Na
+
ions
enhance
electrical
conductivity
sensitivity
(gauge
factor
(GF)
=
1.51),
demonstrating
potential
applications
flexible
sensing.
Advanced Materials,
Год журнала:
2024,
Номер
36(23)
Опубликована: Фев. 23, 2024
Abstract
Hydrogels
possess
unique
features
such
as
softness,
wetness,
responsiveness,
and
biocompatibility,
making
them
highly
suitable
for
biointegrated
applications
that
have
close
interactions
with
living
organisms.
However,
conventional
man‐made
hydrogels
are
usually
soft
brittle,
inferior
to
the
mechanically
robust
biological
hydrogels.
To
ensure
reliable
durable
operation
of
wearable
implantable
devices,
mechanical
matching
shape
adaptivity
tissues
organs
essential.
Recent
advances
in
polymer
science
processing
technologies
enabled
engineering
shaping
various
applications.
In
this
review,
network
structuring
strategies
at
micro/nanoscales
toughening
summarized,
representative
functionalities
exist
materials
but
not
easily
achieved
synthetic
further
discussed.
Three
categories
technologies,
namely,
3D
printing,
spinning,
coating
fabrication
tough
hydrogel
constructs
complex
shapes
reviewed,
corresponding
also
highlighted.
These
developments
enable
adaptive
functional
promote
application
fields
biomedical
engineering,
bioelectronics,
robotics.
Macromolecules,
Год журнала:
2024,
Номер
57(6), С. 2746 - 2755
Опубликована: Фев. 22, 2024
Breakthrough
to
the
extreme
properties
of
polymer
networks
relies
on
new
insights
into
their
molecular
dynamics.
Time-salt
concentration
superposition
has
been
discovered
in
polyelectrolyte
coacervate
systems,
proving
instrumental
tuning
mechanical
performance
hydrogels.
However,
time-salt
type
never
mentioned
existing
literature.
Herein,
we
reported
that
poly(methacrylamide)
(PMAm)
hydrogel
can
be
systematically
regulated
a
vast
range
by
treating
with
different
salts,
for
example,
Young's
modulus
tuned
from
10–2
103
MPa.
The
unusual
behavior
salt-stiffening
arises
salt-enhanced
phase
separation
network
and
subsequent
glassy
transition
polymer-rich
phase.
Rheological
results
demonstrate
dynamic
hydrogels
superposed
onto
"time-salt
type"
master
curves
salt
types
aligning
along
Hofmeister
series.
shift
factor
exhibits
correlation
mobility
water
molecules
as
revealed
low-field
nuclear
magnetic
resonance
spectroscopy.
A
polymer–water–salt
ternary
interaction
mechanism
was
proposed
elucidate
equivalent
behavior.
Guided
principle,
processing
strategy
brought
up
expand
property
limits
PMAm
hydrogel.
With
simply
switching
employed,
could
either
stiff
wear-resistant
material
akin
plastics
or
soft
flowable
gel
utilizable
recycling.
ACS Applied Materials & Interfaces,
Год журнала:
2024,
Номер
16(9), С. 11914 - 11929
Опубликована: Фев. 21, 2024
Conductive
hydrogels
have
shown
promising
application
prospects
in
the
field
of
flexible
sensors,
but
they
often
suffer
from
poor
mechanical
properties,
low
sensitivity,
and
lack
frost
resistance.
Herein,
we
report
a
tough,
highly
sensitive,
antifreeze
strain
sensor
assembled
conductive
organohydrogel
composed
dual-cross-linked
polyacrylamide
poly(vinyl
alcohol)
(PVA)
network,
as
well
MXene
nanosheets
nanofillers
poly(3,4-ethylenedioxythiophene)-doped
poly(styrenesulfonate)
(PEDOT/PSS)
main
conducting
component
(PPMP-OH
organohydrogel).
The
tensile
strength
toughness
PPMP-OH
had
been
greatly
enhanced
by
due
to
reinforcement
nanosheets,
various
strong
noncovalent
interactions
formed
organohydrogels.
PPM1P-OH
organohydrogels
showed
1.48
MPa
at
772%
5.59
MJ/m3.
Moreover,
conductivity
strain-sensing
performance
were
significantly
improved
PEDOT/PSS,
which
can
form
hydrogen
bonds
with
PVA
electrostatic
MXene.
This
was
beneficial
for
constructing
uniformly
distributed
stable
3D
network
helped
obtain
strain-dependent
resistance
PPMP-OH.
sensors
PPMP1-OH
exhibited
high
sensitivity
5.16,
wide
range
detectable
strains
up
500%,
short
response
time
122
ms,
effectively
detect
physiological
activities
human
body
stability.
In
addition,
corresponding
pressure
array
also
identifying
magnitude
position.
Angewandte Chemie International Edition,
Год журнала:
2024,
Номер
63(18)
Опубликована: Март 8, 2024
A
general
approach
to
constructing
room
temperature
phosphorescence
(RTP)
materials
involves
the
incorporation
of
a
phosphorescent
emitter
into
rigid
host
or
polymers
with
high
glass
transition
temperature.
However,
these
often
suffer
from
poor
processability
and
suboptimal
mechanical
properties,
limiting
their
practical
applications.
In
this
work,
we
developed
benzothiadiazole-based
dialkene
(BTD-HEA),
multifunctional
remarkable
yield
intersystem
crossing
(Φ
Science,
Год журнала:
2025,
Номер
387(6737), С. 967 - 973
Опубликована: Фев. 27, 2025
Hydrogels
consist
of
cross-linked
polymers
that
are
highly
swollen
with
water.
Water
evaporation
or
freezing
during
temperature
changes
may
lead
to
stiff
and
brittle
hydrogels.
We
introduce
a
strategy
called
“hydro-locking,”
which
involves
immobilizing
the
water
molecules
within
polymer
network
hydrogel.
This
is
accomplished
by
establishing
robust
connections
between
using
sulfuric
acid.
A
sacrificial
introduced
shield
prime
from
collapsing.
Under
hydro-locking
mode,
an
alginate-polyacrylamide
double-network
hydrogel
remains
soft
stretchable
range
spans
–115°
143°C.
The
works
hydrogels
solutions
enable
preservation
observation
materials
even
living
organisms
at
extreme
temperatures.