Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
34(25)
Published: Feb. 4, 2024
Abstract
Hydrogel
electrolyte
is
not
resistant
to
freezing
and
has
weak
mechanical
properties,
its
fabrication
time‐consuming
energy‐consuming,
limiting
application.
Here,
a
simple,
universal,
fast
gelation
based
on
dealkaline
lignin
(DL)
‐alkali
metal
ions
developed.
The
complex
formed
by
catechol
alkali
promotes
the
equilibrium
of
redox
reactions.
produced
SO
4
−
·,
OH·
singlet
oxygen
(
1
O
2
)
radicals
are
responsible
for
rapid
polymerization
vinyl
monomers.
Alkali
play
dual
role
in
frost
resistance
hydrogel
electrolytes.
By
modulating
mass
ratio
DL
ion
concentration,
preferred
can
be
fabricated
an
alkaline
aqueous
solution
min
at
room
temperature
possesses
excellent
anti‐freezing
performance
(0.51
mS
cm
−1
−40
°C)
strong
properties
(tensile
stress:
0.4
MPa,
strain:
1125%).
electrolyte‐assembled
supercapacitor
exhibits
high
stability
low
temperatures.
specific
capacitance
retention
89.7
%
88.7
after
5000
charge/discharge
cycles
25
−20
°C,
respectively.
lignin‐alkali
self‐catalytic
system
completely
different
from
reported
lignin‐oxidizing
will
open
up
new
way
ionic
conductors
energy
storage
devices.
Advanced Functional Materials,
Journal Year:
2022,
Volume and Issue:
33(1)
Published: Nov. 4, 2022
Abstract
Swelling
is
ubiquitous
for
conventional
hydrogels
but
not
favorable
many
situations,
especially
underwater
applications.
In
this
study,
an
anti‐swelling
and
mechanically
robust
polyacrylic
acid
(PAAc)/gelatin
composite
hydrogel
reported
with
a
rapid
gelation
process
(10
1
s)
under
mild
conditions
via
the
synergy
of
MXene‐activated
initiation
zirconium
ion
(Zr
4+
)‐induced
cross‐linking,
without
requirement
external
energy
input.
The
MXene
found
efficient
to
activate
chain
initiation,
while
Zr
prone
indispensable
facilitating
cross‐linking
formed
polymer
chains.
resulting
exhibits
integration
exceptional
properties
high
mechanical
performance
at
room
temperature,
thanks
dense
hydrogen
bonds
between
PAAc
gelatin
chains
that
enable
upper
critical
solution
temperature
above
temperature.
Also,
desirable
electrical
conductivity
emerges
in
due
simultaneous
contribution
,
allowing
stable
signal
output
gel
upon
deformation
underwater.
As
demonstration,
communicator
by
harnessing
as
sensing
module
assembled,
which
capable
wirelessly
delivering
messages
decoder
on
ground
Morse
codes.
This
study
provides
exemplary
way
tough
durable
Advanced Functional Materials,
Journal Year:
2023,
Volume and Issue:
33(15)
Published: Feb. 7, 2023
Abstract
The
conductive
hydrogels
always
suffered
from
high
internal
friction,
large
hysteresis,
and
low
capability
of
accurately
predicting
physical
deformation,
which
seriously
restricted
their
application
in
smart
wearable
devices.
To
address
these
problems,
solvent
molecules
are
directionally
inserted
into
the
polymer
molecule
chains
via
bridge
effect
to
effectively
reduce
molecular
friction.
Moreover,
swelling
is
also
combined
eliminate
temporary
entanglements
hydrogel
system.
cooperation
between
swollen
endows
prepared
polyacrylamide
(PAM)/laponite/H
3
BO
/ethylene
glycol
(Eg)
organohydrogel
(PLBOH)
ultralow
hysteresis
(1.38%,
ε
=
100%),
ultrafast
response
(≈10
ms),
linearity
whole‐strain‐range
(
R
2
0.996)
with
a
great
sensitivity
GF
2.68
at
strain
range
0–750%).
Meanwhile,
PL
10
B
30
OH
exhibits
long‐term
stability,
excellent
stretchability,
dissipated
energy.
Furthermore,
assembled
triboelectric
nanogenerator
(TENG)
displays
an
outstanding
energy
harvesting
performance
output
voltage
200
V
size
20
mm
×
mm.
sensors
can
monitor
small
facial
expressions
human
movements,
indicating
tremendous
applications
self‐powered
intelligent
flexible
electronics
under
harsh
environmental
conditions.
Advanced Functional Materials,
Journal Year:
2022,
Volume and Issue:
32(46)
Published: Sept. 7, 2022
Abstract
The
development
of
flexible
conductive
elastomers
integrating
renewable
feedstock,
splendid
mechanical
property,
and
excellent
weather
resistance
is
major
interest
challenge.
Here,
a
novel
strategy
reported
to
construct
the
liquid‐free
cellulose‐derived
ionic
elastomer
that
successfully
applied
in
wearable
sensor
triboelectric
nanogenerators
(TENG).
In
this
strategy,
with
physical
chemical
dual‐crosslinking
network
prepared
via
situ
polymerization
polymerizable
deep
eutectic
solvent.
construction
improves
strength
toughness
more
than
2
times,
cellulose
contributes
forming
dense
hydrogen
bond
crosslinking
can
improve
recyclability,
anti‐freezing,
solvent‐resistance
performance.
Benefiting
from
these
features,
sensors
TENG
for
monitoring
human
motion,
harvesting
energy
convert
into
stable
electrical
outputs
light
LEDs,
charge
capacitor,
power
electronic
watch.
maintains
reliable
sensing
performance
even
after
recycling,
soaking
organic
solvent,
or
at
low/high
temperature.
This
study
paves
promising
fabricating
sustainable
multifunction
electronics
are
suitable
harsh
environments.
ACS Nano,
Journal Year:
2024,
Volume and Issue:
18(4), P. 3720 - 3732
Published: Jan. 18, 2024
Piezoelectric
hydrogel
sensors
are
becoming
increasingly
popular
for
wearable
sensing
applications
due
to
their
high
sensitivity,
self-powered
performance,
and
simple
preparation
process.
However,
conventional
piezoelectric
hydrogels
lack
antifreezing
properties
thus
confronted
with
the
liability
of
rupture
in
low
temperatures
owing
use
water
as
dispersion
medium.
Herein,
a
kind
organohydrogel
that
integrates
piezoelectricity,
low-temperature
tolerance,
mechanical
robustness,
stable
electrical
performance
is
reported
by
using
poly(vinylidene
fluoride)
(PVDF),
acrylonitrile
(AN),
acrylamide
(AAm),
Advanced Functional Materials,
Journal Year:
2023,
Volume and Issue:
33(41)
Published: June 9, 2023
Abstract
Due
to
their
intrinsic
flexibility,
tunable
conductivity,
multiple
stimulus‐response,
and
self‐healing
ability,
ionic
conductive
hydrogels
have
drawn
significant
attention
in
flexible/wearable
electronics.
However,
challenges
remain
because
traditional
inevitably
faced
the
problems
of
losing
flexibility
conductivity
inner
water
loss
when
exposed
ambient
environment.
Besides,
inside
hydrogel
will
freeze
at
icing
temperatures,
making
device
hard
fragile.
As
a
promising
alternative,
organogels
attracted
wide
they
can,
some
extent,
overcome
above
drawbacks.
Herein,
kind
organogel
conductor
(MOIC)
by
self‐polymerization
reaction
is
involved,
which
super
stretchable,
anti‐drying,
anti‐freezing.
Meanwhile,
it
can
still
maintain
high
mechanical
stability
after
alternately
loading/unloading
strain
600%
for
600
s
(1800
cycles).
Using
this
MOIC,
high‐performance
triboelectric
nanogenerator
(TENG)
constructed
(MOIC‐TENG)
harvest
small
energy
even
MOIC
electrode
underwent
an
extremely
low
temperature.
In
addition,
multifunctional
sensors
(strain
sensor,
piezoresistive
tactile
sensor)
are
realized
monitor
human
motions
real
time,
recognize
different
materials
effect.
This
study
demonstrates
candidate
material
electronics
such
as
electronic
skin,
flexible
sensors,
human‐machine
interfaces.
Nature Communications,
Journal Year:
2024,
Volume and Issue:
15(1)
Published: May 8, 2024
Abstract
Self-powered
skin
attachable
and
detachable
electronics
are
under
intense
development
to
enable
the
internet
of
everything
everyone
in
new
useful
ways.
Existing
on-demand
separation
strategies
rely
on
complicated
pretreatments
physical
properties
adherends,
achieving
detachable-on-demand
a
facile,
rapid,
universal
way
remains
challenging.
To
overcome
this
challenge,
an
ingenious
cellulose
nanofiber-mediated
manifold
dynamic
synergy
strategy
is
developed
construct
supramolecular
hydrogel
with
both
reversible
tough
adhesion
easy
photodetachment.
The
nanofiber-reinforced
network
coordination
between
Fe
ions
polymer
chains
endow
reconfiguration
networks
behavior
hydrogel.
This
enables
simple
rapid
fabrication
strong
yet
hydrogels
tunable
toughness
((Value
max
-Value
min
)/Value
up
86%),
energy
93%),
stable
conductivity
12
mS
cm
−1
.
We
further
extend
fabricate
different
nanofiber/Fe
3+
-based
from
various
biomacromolecules
petroleum
polymers,
shed
light
exploration
fundamental
reconfiguration.
Simultaneously,
we
prepare
adhesive-detachable
triboelectric
nanogenerator
as
human-machine
interface
for
self-powered
wireless
monitoring
system
based
strategy,
which
can
acquire
real-time,
monitoring,
whole-body
movement
signal,
opening
possibilities
diversifying
potential
applications
electronic
skins
intelligent
devices.
ACS Nano,
Journal Year:
2023,
Volume and Issue:
17(14), P. 13948 - 13960
Published: July 10, 2023
Hydrogels
with
strong
yet
reversible
mechanical
and
adhesive
properties
fabricated
in
a
facile
friendly
manner
are
important
for
engineering
intelligent
electronics
applications
but
challenging
to
create
control.
Existing
approaches
preparing
hydrogels
involve
complicated
pretreatments
produce
that
suffer
from
limited
skin
applicability.
Copolymerized
expected
present
an
intriguing
target
this
field
by
means
of
thermoresponsive
features,
while
the
perceived
intrinsic
flaws
brittleness,
easy
fracture,
weak
adhesion
enervate
development
prospects.
Herein,
we
report
hydrogel
using
cellulose
nanofibrils
simultaneously
address
multiple
dilemmas
inspired
temperature-mediated
phase
separation
strategy.
This
strategy
applies
temperature-driven
formation
dissociation
hydrogen
bonds
between
common
copolymers
trigger
onset
termination
dynamically
on-demand
properties.
The
resulting
exhibits
up
96.0%
(117.2
J/m2
vs
4.8
interfacial
toughness)
85.7%
(0.02
MPa
0.14
stiffness)
tunability
when
worked
on
skin,
respectively.
Our
offers
promising,
simple,
efficient
way
directly
achieve
robust
performance
one
step
biomass
resources,
implications
could
go
beyond
hydrogels.
