Macromolecular Rapid Communications,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 20, 2024
Abstract
Poly(
N
‐isopropyl
acrylamide)
(PNIPAm)‐based
smart
hydrogels
are
widely
employed
in
emerging
applications
such
as
drug
delivery
and
tissue
engineering,
because
their
lower
critical
solution
temperature
(LCST)
is
close
to
physiological
conditions.
However,
the
dense
chain
collapse
during
thermo‐responsive
phase
transition
restricts
water
diffusion,
resulting
limited
volumetric
change.
Here,
a
pure
PNIPAm
hydrogel
that
achieves
large‐scale
volume
by
incorporating
microgels,
presented.
During
its
shrinkage,
microgels
contract
10%
of
original
volume,
generating
open
macropores
serve
efficient
channels,
thereby
facilitating
change
bulk.
In
contrast
conventional
with
static
porous
structures,
these
dynamic
disappear
when
return
initial
state
at
temperatures,
preserving
mechanical
integrity
entire
hydrogel.
This
enhanced
deformability
enables
bilayer
actuator
achieve
bending
angles
exceeding
1150°,
sixfold
increase
over
traditional
PNIPAm‐based
actuators,
allowing
it
function
an
intelligent
gripper
capable
capturing
small,
mobile
organisms.
approach,
which
addresses
inherent
challenge
achieving
bulk
hydrogels,
distinct
from
existing
strategies.
Microsystems & Nanoengineering,
Год журнала:
2025,
Номер
11(1)
Опубликована: Март 4, 2025
Achieving
autonomously
responding
to
external
stimuli
and
providing
real-time
feedback
on
their
motion
state
are
key
challenges
in
soft
robotics.
Herein,
we
propose
an
asymmetric
three-layer
hydrogel
muscle
with
integrated
sensing
actuating
performances.
The
layer,
made
of
p(NIPAm-HEMA),
features
open
pore
structure,
enabling
it
achieve
58%
volume
shrinkage
just
8
s.
customizable
heater
allows
for
efficient
programmable
deformation
the
layer.
A
strain-responsive
a
linear
response
up
50%
strain,
is
designed
sense
process.
Leveraging
these
capabilities,
develop
that
can
recognize
lifted
objects
various
weights
or
grasped
different
sizes.
Furthermore,
demonstrate
self-crawling
robot
showcase
application
potential
robots
working
aquatic
environments.
This
robot,
featuring
modular
distributed
move
forward
under
closed-loop
control
based
self-detected
resistance
signals.
strategy
stimuli-responsive
materials
offers
unprecedented
capabilities
creating
smart
multifunctional
Abstract
Inspired
by
the
Mimosa
plant,
this
study
herein
develops
a
unique
dynamic
shape
memory
polymer
(SMP)
network
capable
of
transitioning
from
hard
to
pliable
with
heat,
featuring
reversible
actuation,
self‐healing,
recyclability,
and
degradability.
This
material
is
adept
at
simulating
functionalities
artificial
muscles
for
variety
tasks,
remarkable
specific
energy
density
1.8
J
g
−1
—≈46
times
higher
than
that
human
skeletal
muscle.
As
an
intelligent
manipulator,
it
demonstrates
proficiency
in
identifying
handling
items
high
temperatures.
Its
suitable
rate
recovery
around
body
temperature
indicates
its
promising
utility
as
implant
addressing
acute
obstructions.
The
covalent
bonding
within
structure
not
only
provides
excellent
resistance
solvents
but
also
bestows
abilities
reprocessing,
degradation.
These
attributes
significantly
boost
practicality
environmental
sustainability.
Anticipated
promote
advancements
sectors
biomedical
devices,
soft
robotics,
smart
actuators,
SMP
represents
forward
leap
muscles,
marking
stride
toward
future
adaptive
sustainable
technology.
ACS Applied Materials & Interfaces,
Год журнала:
2024,
Номер
16(43), С. 59202 - 59215
Опубликована: Окт. 22, 2024
Soft
actuators
made
of
thermoresponsive
polymers
have
great
potential
for
intelligent
robotics
and
biomedical
devices
due
to
their
reversible
deformation
capability
in
response
temperature
fluctuations.
However,
they
are
constrained
by
a
predefined
phase
transition
temperature,
limited
directional
deformation,
nonbiocompatible
formulations,
thereby
restricting
practical
utility.
Herein
new
biomimicry
approach
is
presented
overcome
these
limitations
developing
hydro-
hydrothermally
responsive
soft
biocompatible
pliable
materials
i.e.
cotton
yarn
polyurethane.
We
mimic
the
tubular
shape
elephant
trunks
with
unique
muscle
orientation
embedding
helical
within
hydrophilic
polyurethane
tube,
followed
targeted
surface
patterning.
Unlike
narrow-range
morphing
across
boundary
typical
hydrogel
actuators,
we
harness
hydrothermal
stiffness
variations
obtain
consistent
capabilities
over
much
wider
range.
The
developed
can
perform
versatile
activities
such
as
linear,
bending,
curvilinear,
rotating
movements,
overcoming
unidirectional
motion
conventional
actuators.
cell
viability
assay
on
building
block
also
confirms
high
biocompatibility
reported
facile
fabrication
strategy
provides
insights
designing
complex
yet
free-standing
from
readily
available
supple
materials.
Angewandte Chemie,
Год журнала:
2024,
Номер
136(34)
Опубликована: Май 21, 2024
Abstract
Fabrication
of
chiral
hydrogels
from
thermoresponsive
helical
dendronized
phenylacetylene
copolymers
(PPAs)
carrying
three‐fold
dendritic
oligoethylene
glycols
(OEGs)
is
reported.
Three
different
temperatures,
i.e.
below
or
above
cloud
point
temperatures
(
T
cp
s)
the
copolymers,
and
under
freezing
condition,
were
utilized,
affording
with
morphologies
mechanical
properties.
At
room
temperature,
transparent
obtained
through
crosslinking
among
copolymer
chains.
Differently,
opaque
much
improved
properties
formed
at
elevated
thermally
dehydrated
collapsed
aggregates,
leading
to
heterogeneity
for
highly
porous
morphology.
While
temperature
synergistically
ice
templating,
these
amphiphilic
lamellar
structures,
which
exhibited
remarkable
compressible
as
human
articular
cartilage
excellent
fatigue
resistance.
Amphiphilicity
played
a
pivotal
role
in
modulating
network
formation
during
gelation,
well
morphology
performance
resulting
hydrogels.
Through
crosslinking,
featured
typical
dynamic
conformations
transformed
into
unprecedently
stabilized
helicities
due
restrained
chain
mobilities
three‐dimensional
networks.
Macromolecular Rapid Communications,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 20, 2024
Abstract
Poly(
N
‐isopropyl
acrylamide)
(PNIPAm)‐based
smart
hydrogels
are
widely
employed
in
emerging
applications
such
as
drug
delivery
and
tissue
engineering,
because
their
lower
critical
solution
temperature
(LCST)
is
close
to
physiological
conditions.
However,
the
dense
chain
collapse
during
thermo‐responsive
phase
transition
restricts
water
diffusion,
resulting
limited
volumetric
change.
Here,
a
pure
PNIPAm
hydrogel
that
achieves
large‐scale
volume
by
incorporating
microgels,
presented.
During
its
shrinkage,
microgels
contract
10%
of
original
volume,
generating
open
macropores
serve
efficient
channels,
thereby
facilitating
change
bulk.
In
contrast
conventional
with
static
porous
structures,
these
dynamic
disappear
when
return
initial
state
at
temperatures,
preserving
mechanical
integrity
entire
hydrogel.
This
enhanced
deformability
enables
bilayer
actuator
achieve
bending
angles
exceeding
1150°,
sixfold
increase
over
traditional
PNIPAm‐based
actuators,
allowing
it
function
an
intelligent
gripper
capable
capturing
small,
mobile
organisms.
approach,
which
addresses
inherent
challenge
achieving
bulk
hydrogels,
distinct
from
existing
strategies.
