Advanced Optical Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 25, 2024
Abstract
Mechanoresponsive
photonic
crystals
(MPCs)
exhibit
tunable
optical
properties
and
hold
great
promise
for
a
wide
range
of
applications.
However,
fabricating
them
in
bulk
form
remains
significant
challenge.
In
this
study,
novel
approach
is
presented
producing
MPCs
with
enhanced
properties.
By
incorporating
shear‐ordering
into
the
3D
molding
process,
study
successfully
fabricates
that
display
bright,
saturated
structural
colors
80%
reflectance.
The
are
constructed
layer‐by‐layer
via
successive
shear‐printing
using
colloidal
particles
embedded
photocurable
resins.
Each
layer
subjected
to
oscillatory
shear
facilitated
by
modified
printing
setup.
This
process
creates
highly
ordered
face‐centered
cubic
lattice
structure
throughout
material.
final
product
exhibits
distinct
on
its
various
faces,
depending
planes
exposed
at
different
orientations.
material
strain‐resilient,
pronounced
color
shifting
response
applied
stress.
A
detailed
experimental
mechanism
resulting
structures
provided.
method
offers
an
efficient
way
fabricate
performance
comparable
best
thin
films
can
be
extended
more
complex
shapes.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: July 11, 2024
Abstract
Structurally
colored
objects
with
3D
geometries
are
intriguing
in
optical
devices
and
visual
sensors,
but
their
preparation
is
bottlenecked
by
complicated
procedures
limited
material
choices.
Herein,
a
facile
supramolecular
printing
strategy
proposed
via
direct
ink
writing
(DIW)
colloidal
inks
(SCIs)
consisting
of
polymers
colloids
based
on
interactions
to
construct
healable
recyclable
structurally
objects.
Optimized
balance
the
rheological
requirements
for
DIW
high
particle
volume
fraction
one‐step
immediate
generation
structural
color.
The
shear‐thinning
thixotropy
features
SCIs,
characterized
two‐order‐of‐magnitude
decrease
viscosity
during
process
50%
storage
modulus
recovery
thereafter,
ensure
reversible
solid–liquid
transition
extrusion
deposition
process.
short‐range
ordered
arrangements
within
matrix
give
rise
angle‐independent
Moreover,
from
SCIs
and,
more
importantly,
can
be
closed‐looped
recycled
thanks
reversibility
interactions.
Leveraging
optimized
interactions,
various
wide
range
choices
meeting
extended
directly.
This
study
paves
way
constructing
advanced
materials
strategy.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Aug. 21, 2024
Abstract
Structural
color
coatings
with
brilliant
is
important
in
practical
applications,
such
as
aesthetic
decoration,
bionic
skins,
colorimetric
sensors,
and
other
color‐related
fields.
However,
the
intrinsic
conflict
between
fast
self‐assembly
bright
structural
hinders
their
widespread
applications.
Here,
cholesteric
liquid
crystal
elastomer
(CLCE)
mechanochromic
response
are
developed
by
spraying
(CLC)
paints
followed
evaporation‐induced
(EISA)
photocuring.
The
Marangoni
flow
within
paints,
which
drives
orientation
of
molecules
along
track
EISA
process,
found
to
be
crucial
for
achieving
both
rapid
time
(60
s)
high
reflectivity
(42%).
as‐prepared
CLCE
present
uniform
colors,
circularly
polarized
reflection,
response.
Several
proofofconcept
applications
also
demonstrated,
including
patterned
on
flat
substrates,
fully
covered
3D
objects,
non‐spectral
colors
via
additive
mixing
method.
research
disclosed
herein
provides
unprecedented
levels
efficiency
reliability
preparing
coatings.
Materials,
Journal Year:
2024,
Volume and Issue:
17(16), P. 3980 - 3980
Published: Aug. 10, 2024
Mechanochromic
materials
provide
optical
changes
in
response
to
mechanical
stress
and
are
of
interest
a
wide
range
potential
applications
such
as
strain
sensing,
structural
health
monitoring,
encryption.
Advanced
manufacturing
3D
printing
enables
the
fabrication
complex
patterns
geometries.
In
this
work,
classes
stretchable
mechanochromic
that
visual
color
when
tension
is
applied,
namely,
dyes,
polymer
dispersed
liquid
crystals,
crystal
elastomers,
cellulose
nanocrystals,
photonic
nanostructures,
hydrogels,
hybrid
systems
(combinations
other
classes)
reviewed.
For
each
class,
synthesis
processing,
well
mechanism
change
discussed.
To
enable
selection
across
classes,
sensitivity
different
compared.
Photonic
demonstrate
high
(Δnm/%
strain),
large
dynamic
range,
rapid
reversibility.
Further,
behavior
can
be
predicted
using
simple
model.
with
properties
(elastic
modulus)
have
been
achieved.
The
addition
dyes
has
broadened
i.e.,
over
which
there
an
change.
irreversible
desired,
dye-based
or
elastomer
formulated.
While
many
promising
demonstrated,
uniform
on
scale
remains
challenge.
Standardized
characterization
methods
needed
translate
practical
applications.
sustainability
also
important
consideration.
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.
Advanced Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 3, 2025
Abstract
Non‐iridescent
photonic
glass
pigments
of
block
copolymers
show
great
potential
for
sustainable
structural
coloration.
However,
the
ability
to
create
accurate
RGB
color
mixtures
real‐world
applications
is
limited
by
prevalent
use
non‐degradable,
fossil
oil‐derived
components
and
difficulty
in
achieving
pure
red
hues.
This
work
presents
an
alternative
strategy
more
coloration
fabricating
composite
through
controlled
self‐assembly
water,
vegetable
oil,
biodegradable
bottlebrush
(BBCPs)
a
complex
emulsion
system.
The
obtained
balls
feature
unprecedented
multicompartment
structures
characterized
short‐range
ordered
assembly
water
nanodroplets
stabilized
BBCPs,
along
with
oil
droplets
these
nanodroplets,
which
substantially
enhances
resistance
Ostwald
ripening.
Furthermore,
new
model
introduced
eliminate
disordered
scattering,
successfully
creating
overcoming
long‐standing
limitation
versatile
chromatic
engineering.
