Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 23, 2024
Abstract
Intrinsically
stretchable
devices
often
suffer
from
non‐uniform
strain
distributions
under
direct‐stretching
conditions
due
to
their
large‐scale,
patterned
designs,
leading
inconsistent
performance.
To
address
these
issues,
mechanochromic
materials—substances
that
change
color
in
response
strain—for
precise
and
intuitive
monitoring
are
employed.
Leveraging
this
data,
strategic
design
modifications,
including
extrinsic
techniques
such
as
rigid‐island
with
soft‐substrate
kirigami
cuts
implemented,
mitigate
non‐uniformity.
Thus,
highly
desired
uniform
homogenous
control
a
multi‐pixel
system
is
achieved.
By
integrating
strain‐stopping
methods
into
arrays
of
rigid
soft
chiral
liquid
crystal
elastomers
(CLCEs),
effective
separation
demonstrated
for
encrypted
information
enhanced
uniformity
control.
Additionally,
the
dynamic
optical
selectivity
circularly
polarized
light
(CPL)
CLCEs
specific
explored,
using
uniaxial
stretching
achieve
both
changes
refined
CPL
separation.
Consequently,
leveraging
inherent
properties
CLCEs,
functional
operating
devised.
The
application
strategies
not
only
resolves
issues
but
also
advances
field
smart
materials,
offering
new
possibilities
color‐
polarization‐separating
based
on
applications.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Oct. 15, 2024
Abstract
Fabricating
photonic
crystals
(PCs)
with
dynamic
multi‐stimuli‐responsive
structural
colors,
recordable
and
self‐healable
properties
is
significant
for
their
emerging
applications,
yet
remains
a
big
challenge.
Here,
an
all‐in‐one
multifunctional
PC
(MFPC)
film
outstanding
mechanochromic,
thermochromic,
solvatochromic,
color/shape‐recordable,
self‐healable,
adhesive
functions
designed
prepared
by
simply
non‐close‐assembling
silica
particles
into
the
unique
2‐[[(Butylamino)carbonyl]oxy]ethyl
acrylate
(BCOEA)
followed
photopolymerization.
The
success
mainly
due
to
rational
combination
of
non‐close‐packing
structures
BCOEA's
characteristics,
including
its
urethane
groups
numerous
sacrificial
hydrogen
bonds,
temperature‐dependent
refractive
index,
swellable
deformable
polymer
network,
as
well
low
glass‐transition
temperature.
MFPC's
hue
color
saturation
can
be
reversibly
dynamically
modulated
strain/pressure/solvents
temperature,
respectively,
thereby
realizing
visually
spectrally
sensing
these
stimuli.
More
interestingly,
color‐responsiveness
combined
other
endows
MFPCs
fascinating
multilayer
optical
filters,
inkless
printing,
reconfigurable
multicolor
patterns,
stretching‐based
anti‐counterfeiting,
etc.
This
work
offers
new
perspective
designing
next‐generation
smart
materials
will
facilitate
all‐round
applications.
Journal of the American Chemical Society,
Journal Year:
2025,
Volume and Issue:
147(6), P. 5300 - 5309
Published: Jan. 30, 2025
Piezochromic
materials
usually
exhibit
a
gradual
redshift
of
emission
as
pressure
increases
due
to
the
formation
low-energy
"dark"
state,
e.g.,
excimer.
However,
our
study
presents
an
anomalous
excimer-based
pressure-induced
blueshift.
A
crystal
was
investigated
here
with
discrete
π-π
anthracene
dimer
stacking
and
excimer
emission,
is
characterized
by
overshifted
off-center
pattern.
Intriguingly,
under
isotropic
hydrostatic
pressure,
this
exhibits
negative
linear
compressibility
almost
along
c-axis
unit
cell.
Furthermore,
antagonistic
effect
between
overlap
ratio
(Sπ-π)
interplanar
distance
(Dπ-π)
within
on
identified:
reduced
Dπ-π
typically
dominates
redshift,
while
decreasing
Sπ-π
can
cause
When
reaches
around
5.00
GPa,
fluorescence
unexpected
blueshift,
indicating
reign
Sπ-π.
This
not
only
sheds
light
modulation
properties
noncovalent
interactions
but
also
introduces
innovative
approach
piezochromism.
Advanced Optical Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 5, 2025
Abstract
In
nature,
the
ability
to
regulate
and
transmit
color
signals
is
fundamental
adaptive
survival
of
many
organisms.
A
key
aspect
this
adaptability
autonomous
detection
chromatic
changes
in
color‐displaying
structures,
facilitating
precise
matching
with
environmental
stimuli.
However,
conventional
mechanochromic
materials
rely
on
a
single
mechanical
force
feedback
channel,
lacking
continuously
monitor
their
state
real‐time.
work,
novel
approach
presented
that
integrates
ZnS@SiO
2
photonic
crystals
LiCl
into
TEMPO‐Oxidized
cellulose
nanofibers‐polyacrylamide
hydrogel
matrix
(PAM‐TOCNF
hydrogel),
which
successfully
endow
conductivity
variation
hydrogel.
This
system
mimics
chameleonic
mechanism
by
coupling
ion
conduction
achieve
responsive
real‐time
process
monitoring.
These
findings
establish
new
paradigm
for
optoelectronic
systems
stimulus‐responsive
capabilities,
paving
way
future
advancements
bio‐inspired,
technologies.
Small,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 5, 2025
Abstract
One‐dimensional
photonic
crystals
(1D
PCs)
emerged
as
superb
sensing
platforms
due
to
their
high
sensitivity
environmental
changes.
However,
effectively
translating
the
microscopic
interactions
between
covalent
organic
frameworks
(COFs)
and
analytes
into
macroscopic
optical
responses
via
1D
PCs
for
intuitive
detection
presents
a
significant
challenge.
Here,
we
propose
stepwise‐induced
synthesis
strategy
that
first
time
achieves
size‐controlled
of
uniform
nanoscale
COFs
(60–80
nm),
leading
high‐quality
COF
layer.
This
advancement
enables
COF‐based
exhibit
diverse
color
variations
controllable
saturation.
Notably,
excellent
compatibility
layer
with
inorganic
oxides,
polymers,
metal‐organic
(MOFs)
results
in
these
exhibiting
bright
colors.
Crucially,
introducing
mesoporous
materials
achieve
deep
integration
adsorption
recognition
functions
volatile
compounds
(VOCs).
The
fabricated
COF/MOF
PC
allows
differentiation
12
VOCs
visually
detects
at
different
concentrations
(0–80
g
m
−
3
)
through
changes,
response
under
1
s.
In
particular,
can
be
transferred
flexible
substrates
while
retaining
VOC
visual
sensing.
These
attributes
highlight
potential
real‐time
monitoring
industrial
environments.
Conventional
mechanochromic
photonic
crystals
(MPCs)
have
attracted
broad
interest
because
of
their
force-adjustable
reflective
structural
colors,
which
require
three-dimensional
and
nonclose-packing
structures.
Here,
a
new
type
MPC
with
monolayer
close-packing
structures,
brilliant
iridescent
scattering
unconventional
properties
has
been
fabricated
by
self-assembling
ZnS
particles
into
layer
polycrystalline
structures
then
infiltrating
interparticle
gaps
elastic
polyurethane
(PU).
The
light
diffracted
in
the
forward
direction
high
diffraction
efficiency
large
refractive
index
contrast
between
PU
contributes
to
color
saturation.
shows
interesting
colors
red-shifted
blue-shifted
along
perpendicular
stretching
directions,
originating
from
unique
crystal
orientation-dependent
deformation.
This
work
upgrades
basic
understanding
relationship
optical
offers
perspective
for
designing
advanced
stimulus-responsive
materials.
