Nanomaterials,
Journal Year:
2024,
Volume and Issue:
14(17), P. 1398 - 1398
Published: Aug. 27, 2024
Electrophysiological
monitoring
is
a
commonly
used
medical
procedure
designed
to
capture
the
electrical
signals
generated
by
body
and
promptly
identify
any
abnormal
health
conditions.
Wearable
sensors
are
of
great
significance
in
signal
acquisition
for
electrophysiological
monitoring.
Traditional
devices
often
bulky
have
many
complex
accessories
thus,
only
suitable
limited
application
scenarios.
Hydrogels
optimized
based
on
nanomaterials
lightweight
with
excellent
stretchable
properties,
solving
problem
high-quality
wearable
sensors.
Therefore,
development
hydrogels
brings
tremendous
potential
physiological
This
review
first
introduces
latest
advancement
made
from
different
nanomaterials,
such
as
nanocarbon
materials,
nanometal
two-dimensional
transition
metal
compounds,
Second,
versatile
properties
these
composite
hydrogel
reviewed.
Then,
their
applications
various
monitoring,
electrocardiogram
electromyographic
analysis,
electroencephalogram
discussed.
Finally,
current
status
future
prospects
nanomaterial-optimized
summarized.
We
hope
this
will
inspire
using
nanomaterial-based
hydrogels.
Advanced Healthcare Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: June 10, 2024
Conductive
hydrogel
has
garnered
significant
attention
as
an
emergent
candidate
for
diverse
wearable
sensors,
owing
to
its
remarkable
and
tailorable
properties
such
flexibility,
biocompatibility,
strong
electrical
conductivity.
These
attributes
make
it
highly
suitable
various
sensor
applications
(e.g.,
biophysical,
bioelectrical,
biochemical
sensors)
that
can
monitor
human
health
conditions
provide
timely
interventions.
Among
these
applications,
conductive
hydrogel-based
temperature
sensors
are
especially
important
healthcare
disease
surveillance.
This
review
aims
a
comprehensive
overview
of
sensors.
First,
this
work
summarizes
different
types
fillers-based
hydrogel,
highlighting
their
recent
developments
advantages
Next,
discusses
the
sensing
characteristics
focusing
on
sensitivity,
dynamic
stability,
stretchability,
signal
output.
Then,
state-of-the-art
introduced,
ranging
from
body
detection
wound
monitoring.
Finally,
identifies
remaining
challenges
prospects
facing
field.
By
addressing
with
potential
solutions,
hopes
shed
some
light
future
research
innovations
in
promising
ACS Nano,
Journal Year:
2024,
Volume and Issue:
18(11), P. 8038 - 8050
Published: March 4, 2024
Liquid
metal
(LM)
particles
can
serve
as
initiators,
functional
fillers,
and
cross-linkers
for
hydrogels.
Herein,
we
show
that
cellulose
nanocrystals
(CNCs)
stabilize
LM
in
aqueous
solutions,
such
those
used
to
produce
The
CNC-coated
initiate
free-radical
polymerization
form
poly(acrylic
acid)
(PAA)
hydrogel
with
exceptional
properties─stretchability
∼2000%,
excellent
toughness
∼1.8
MJ/m3,
mechanical
resilience,
efficient
self-healing─relative
cross-linked
PAA
networks
polymerized
using
conventional
molecular
initiators.
FTIR
spectroscopy,
rheology,
measurements
suggest
physical
bonds
between
both
Ga3+
LM-CNC
contribute
the
properties.
gels
are
sense
a
wide
range
of
strains,
associated
human
motion,
via
changes
resistance
through
gel.
sensitivity
at
low
strains
enables
monitoring
subtle
physiological
signals,
pulse.
Without
significantly
compromising
toughness,
soaking
salt
solution
brings
about
high
ionic
conductivity
(3.8
S/m),
enabling
them
detect
touch
piezoionic
principles;
anions
gel
have
higher
mobility
than
cations,
resulting
significant
charge
separation
(current
∼30
μA,
∼10
μA/cm2)
response
touch.
These
attractive
properties
promising
wearable
sensors,
energy
harvesters,
self-powered
panels.
Materials Horizons,
Journal Year:
2024,
Volume and Issue:
11(16), P. 3856 - 3866
Published: Jan. 1, 2024
Hydrogel
strain
sensors
have
received
increasing
attention
due
to
their
potential
applications
in
human-machine
interfaces
and
flexible
electronics.
However,
they
usually
suffer
from
both
mechanical
electrical
hysteresis
poor
water
retention,
which
limit
practical
applications.
To
address
this
challenge,
a
poly(acrylic
acid-
Nanoscale,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 1, 2025
The
liquid
metal-based
hydrogels
coated
with
polyacrylic
acid
have
the
combination
of
conductivity,
plasticity,
printability,
self-healing
and
skin-like
mechanical
properties,
are
therefore
used
as
an
epidermal
sensor
for
human
health
monitoring.
ACS Applied Materials & Interfaces,
Journal Year:
2023,
Volume and Issue:
15(24), P. 28993 - 29003
Published: June 7, 2023
Stretchable
hydrogels
as
landmark
soft
materials
have
been
efficiently
utilized
in
the
field
of
wearable
sensing
devices.
However,
these
mostly
cannot
integrate
transparency,
stretchability,
adhesiveness,
self-healing,
and
environmental
adaptability
into
one
system.
Herein,
a
fully
physically
cross-linked
poly(hydroxyethyl
acrylamide)-gelatin
dual-network
organohydrogel
is
prepared
phytic
acid-glycerol
binary
solvent
via
rapid
ultraviolet
light
initiation.
The
introduction
gelatin
second
network
endows
with
desirable
mechanical
performance
(high
stretchability
up
to
1240%).
presence
acid
not
only
synergizes
glycerol
impart
environment-tolerance
(from
-20
60
°C)
but
also
increases
conductivity.
Moreover,
demonstrates
durable
adhesive
toward
diverse
substrates,
high
self-healing
efficiency
through
heat
treatment,
favorable
optical
transparency
(transmittance
90%).
Furthermore,
achieves
sensitivity
(gauge
factor
2.18
at
100%
strain)
response
time
(80
ms)
could
detect
both
tiny
(a
low
detection
limit
0.25%
large
deformations.
Therefore,
assembled
organohydrogel-based
sensors
are
capable
monitoring
human
joint
motions,
facial
expression,
voice
signals.
This
work
proposes
facile
route
for
multifunctional
transducers
promises
practical
application
flexible
electronics
complex
scenarios.
Materials Horizons,
Journal Year:
2023,
Volume and Issue:
10(9), P. 3807 - 3820
Published: Jan. 1, 2023
Zwitterionic
hydrogels
have
received
considerable
attention
owing
to
their
characteristic
structures
and
integrating
multifunctionality.
However,
the
superhydrophilicity-induced
poor
mechanical
properties
severely
hinder
potential
applications.
Besides,
from
perspective
of
wide
applications,
zwitterionic
with
integrated
high
properties,
conductivity
multifunctionalities
including
self-adhesive,
self-healing,
photothermal
are
highly
desirable
yet
challenging.
Herein,
a
new
class
high-performance
multifunctional
designed
based
on
incorporation
polydopamine-coated
liquid
metal
nanoparticles
(LM@PDA).
Due
efficient
energy
dissipation
endowed
by
isotropically
extensible
deformation
LM@PDA
multiple
interactions
within
hydrogel
matrix,
resultant
exhibited
ultrahigh
robustness
tensile
strength
up
1.3
MPa,
strain
1555%
toughness
7.3
MJ
m-3,
superior
or
comparable
those
most
hydrogels.
The
introduced
also
endows
conductivity,
versatile
adhesion,
autonomous
excellent
injectability,
three-dimensional
printability,
degradability,
conversion
performance.
These
preferable
enable
promising
as
wearable
sensors
sensory
capabilities
for
range
values
(1-500%),
pressures
(0.5-200
kPa)
temperatures
(20-80
°C)
an
impressive
temperature
coefficient
resistance
(up
0.15
°C-1).
Moreover,
these
can
be
applied
solar
evaporators
water
evaporation
rate
2.42
kg
m-2
h-1)
solar-thermal
efficiency
90.3%)
desalination
wastewater
purification.
present
work
pave
way
future
development
beyond.
