Nature Communications,
Journal Year:
2024,
Volume and Issue:
15(1)
Published: Nov. 28, 2024
Optical
properties
of
cholesteric
liquid
crystal
elastomers
(CLCEs)
can
be
tuned
by
an
external
field,
however,
it
will
spontaneously
restore
to
the
original
state
after
field
is
removed.
Here,
we
introduce
diselenide
dynamic
covalent
bonds
(DCBs)
into
CLCEs,
whose
optical
reversibly
and
precisely
under
combined
action
force
light.
The
written
remembered
thus
a
programming
effect
achieved.
prepared
dynamical
bonded
CLCE
films
have
typical
mechanochromism
property,
high-resolution
colourful
patterning
programmed
adjusting
exposure
time
intensity
masked
visible-light
different
tensile
or
compressive
strain
states.
DCB-CLCEs
combine
novel
anisotropy
CLCEs
chain
exchangeable
ability
DCBs,
which
endows
materials
with
reprogrammable
properties.
We
demonstrate
simple
strategy
writing
naked-eye
film
property
thermal
visible-light,
shows
great
potential
in
display
devices,
anticounterfeiting
labels,
sensors,
smart
materials.
Cholesteric
tunable
but
these
revert
once
By
introducing
bonds,
authors
enable
retain
light
exposure,
achieving
programmable,
high
resolution
color
patterning.
Angewandte Chemie International Edition,
Journal Year:
2024,
Volume and Issue:
63(22)
Published: March 25, 2024
Abstract
Endowing
perovskite
quantum
dots
(PQDs)
with
circularly
polarized
luminescence
(CPL)
offers
great
promise
for
innovative
chiroptical
applications,
but
the
existing
strategies
are
inefficient
in
acquiring
stimuli‐responsive
flexible
chiral
films
large,
tunable
dissymmetry
factor
(
g
lum
)
and
long‐term
stability.
Here,
we
report
a
strategy
design
synthesis
of
luminescent
cholesteric
liquid
crystal
elastomer
(Lumin‐CLCE)
mechanically
CPL,
which
is
enabled
by
crystal‐templated
self‐assembly
situ
covalent
cross‐linking
judiciously
designed
photopolymerizable
CsPbX
3
(X=Cl,
Br,
I)
PQD
nanomonomers
into
elastic
polymer
networks.
The
resulting
Lumin‐CLCE
showcase
structural
color
natural
light
noticeable
CPL
maximum
value
up
to
1.5
under
UV
light.
manipulation
intensity
rotation
direction
achieved
controlling
self‐assembled
helicoidal
nanostructure
handedness
soft
helices.
A
significant
breakthrough
lies
achievement
reversible,
perovskite‐based
switch
activated
biaxial
stretching,
enables
flexible,
dynamic
anti‐counterfeiting
labels
capable
decrypting
preset
information
specific
polarization
states.
This
work
can
provide
new
insights
development
advanced
materials
their
emerging
applications
encryption,
3D
displays,
beyond.
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Feb. 20, 2024
Abstract
Responsive
materials
possess
the
inherent
capacity
to
autonomously
sense
and
respond
various
external
stimuli,
demonstrating
physical
intelligence.
Among
diverse
array
of
responsive
materials,
liquid
crystalline
polymers
(LCPs)
stand
out
for
their
remarkable
reversible
stimuli‐responsive
shape‐morphing
properties
potential
creating
soft
robots.
While
numerous
reviews
have
extensively
detailed
progress
in
developing
LCP‐based
actuators
robots,
there
exists
a
need
comprehensive
summaries
that
elucidate
underlying
principles
governing
actuation
how
intelligence
is
embedded
within
these
systems.
This
review
provides
overview
recent
advancements
robots
endowed
with
using
LCPs.
structured
around
stimulus
conditions
categorizes
studies
involving
LCPs
based
on
fundamental
control
stimulation
logic
approach.
Specifically,
three
main
categories
are
examined:
systems
changing
those
operating
under
constant
equip
learning
capabilities.
Furthermore,
persisting
challenges
be
addressed
outlined
discuss
future
avenues
research
this
dynamic
field.
Communications Chemistry,
Journal Year:
2024,
Volume and Issue:
7(1)
Published: March 14, 2024
Liquid
crystal
elastomers
(LCEs)
are
shape-morphing
materials
that
demonstrate
reversible
actuation
when
exposed
to
external
stimuli,
such
as
light
or
heat.
The
actuation's
complexity
depends
heavily
on
the
instilled
liquid
alignment,
programmed
into
material
using
various
shape-programming
processes.
As
an
unavoidable
part
of
LCE
synthesis,
these
also
introduce
geometrical
and
output
restrictions
dictate
final
applicability.
Considering
LCE's
future
implementation
in
real-life
applications,
it
is
reasonable
explore
limiting
factors.
This
review
offers
a
brief
overview
current
methods
relation
challenges
employing
LCEs
soft,
shape-memory
components
devices.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
34(37)
Published: March 28, 2024
Abstract
Passive
radiative
cooling
materials
can
efficiently
reflect
solar
radiation
and
spontaneously
dissipate
heat
through
the
long‐wave
infrared
(LWIR)
transmission
window
to
coldouter
space.
They
are
highly
attractive
for
application
in
walls
roofs
of
sustainable
energy‐efficient
buildings,
but
it
is
a
challenging
task
develop
switchable
coolers
transparent
windows.
Herein,
free‐standing
bacterial
cellulose‐templated
liquid
crystal
films
with
high
LWIR
emissivity
self‐adaptive
transmittance
reported.
Biosynthetic
silanized
cellulose
3D
interconnected
porous
nanostructure
harnessed
as
robust
template
confining
novel
crystals
smectic
A
chiral
nematic
phase
transition,
thereby
endowing
film
modulation
ability.
The
resulting
found
not
only
exhibit
remarkable
emissivity,
also
adaptively
change
its
between
state
an
opaque
according
environmental
temperature
variation.
Outdoor
experiments
performed,
energy‐saving
performance
evaluated
simulation
12‐story
reference
office
building
applied
This
research
shine
light
on
development
advanced
their
widespread
applications
vehicles,
photovoltaics.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: June 14, 2024
Abstract
Liquid
crystal
elastomer
(LCE)
has
large
and
reversible
deformation
under
stimulation,
making
it
an
ideal
material
for
artificial
muscles.
Currently,
multi‐stimulus
responsive
LCE
actually
responds
to
each
stimulus
independently
rather
than
responding
several
stimuli
simultaneously.
Achieving
enhanced
effect
from
concurrent
is
still
a
challenge,
which
requires
new
stimulus‐response
mechanism.
This
work
develops
novel
facile
solvent
evaporation‐assisted
template
method
prepare
hollow
fiber
(LCEHF)
with
axial
alignment.
Taking
advantage
of
the
heat‐induced
phase
transition
mechanical
force‐induced
orientation
mesogens,
LCEHF
both
heat
pressure
can
produce
contraction
ratio
≈50%,
higher
42%
thermal
stimulation
or
27%
pneumatic
stimulation.
It
also
enhance
respective
response
recovery
speed
300
3700
times
actuation.
Additionally,
lowers
actuation
temperature
much
below
temperature,
imparting
high
performance
during
Furthermore,
dual
thermal‐pneumatic
mimic
human
biceps
cause
rapid
bending
arm
reversibly.
methodology
sheds
light
on
improving
broadens
its
application
scenarios.
Journal of Materials Chemistry A,
Journal Year:
2024,
Volume and Issue:
12(29), P. 18117 - 18126
Published: Jan. 1, 2024
Versatile
CLCEs
with
a
loosely
crosslinking
density
were
developed,
which
exhibit
exceptional
high
mechanical
performances
and
responsive
functionalities
including
thermochromic,
mechanochromic,
shape
memory,
dynamic
adhesion
behaviors.
Micromachines,
Journal Year:
2024,
Volume and Issue:
15(6), P. 808 - 808
Published: June 20, 2024
Creatures
in
nature
make
extensive
use
of
structural
color
adaptive
camouflage
to
survive.
Cholesteric
liquid
crystals,
with
nanostructures
similar
those
natural
organisms,
can
be
combined
actuators
produce
bright
colors
response
a
wide
range
stimuli.
Structural
modulated
by
nano-helical
structures
continuously
and
selectively
reflect
specific
wavelengths
light,
breaking
the
limit
recognizable
human
eye.
In
this
review,
current
state
research
on
cholesteric
crystal
photonic
their
technological
applications
is
presented.
First,
basic
concepts
crystals
nanostructural
modulation
are
outlined.
Then,
responding
different
stimuli
(mechanical,
thermal,
electrical,
humidity,
magnetic,
pneumatic)
This
review
describes
practical
summarizes
prospects
for
development
these
advanced
as
well
challenges
promising
applications.
