Liquid Crystals,
Год журнала:
2024,
Номер
unknown, С. 1 - 10
Опубликована: Ноя. 11, 2024
Cholesteric
liquid
crystal
(CLC)
is
particularly
remarkable
due
to
its
ability
exhibit
structural
colour.
Structural
colour
materials
offer
solutions
for
information
encryption
that
feature
good
stability,
ease
of
perceivability,
and
arbitrary
patterns.
This
work
investigates
the
temperature-dependent
variation
CLC
provides
a
quantitative
analysis
pitch
helix
twist
power
(HTP)
at
different
temperatures,
further
exploring
potential
applications
in
encryption.
By
recording
quick
response
(QR)
code
patterns
LC
Polymer
cell,
single-pattern
dual-pattern
cells
are
prepared,
their
demonstrated.
The
QR
pattern
will
be
hidden
or
revealed
as
temperature
changes
by
cell.
Additionally,
requires
polarisers
address
crosstalk
issue
under
white
light,
making
cell
safer
solution
access
control
systems.
These
results
lay
theoretical
foundation
stimulus-responsive
colours
valuable
insights
security
anti-counterfeiting
applications.
Laser & Photonics Review,
Год журнала:
2024,
Номер
unknown
Опубликована: Июнь 15, 2024
Abstract
Materials
with
structural
coloration
capable
of
multimode
color
manipulation
are
gaining
growing
significance
for
advanced
encryption
and
high‐security
anti‐counterfeiting
applications.
Among
the
most
promising
candidates
naturally
derived
biomaterials,
owing
to
their
renewable,
biocompatible,
biodegradable
features
developing
sustainable,
bio‐interfaced
photonic
platforms.
Nevertheless,
strategies
developed
from
biological
materials
usually
exhibit
limited
optical
operation
modes,
lowering
capability
security
level.
Here,
an
all‐biomass‐based
crystal
platform
is
reported
that
hierarchically
integrates
chiral
nematic
inverse
opal
structures
through
a
combination
colloidal
assembly,
silk
protein
self‐assembly,
self‐assembly
cellulose
nanocrystals,
enabling
multiplex
in
2D
3D
spaces.
The
platform's
Janus‐style
integration
brings
specular
diffuse
reflection,
direction‐dependent
circular
dichroism,
birefringence
into
single
form,
thereby
facilitating
tuning
plane
by
altering
illumination‐viewing
modes.
inherent
shape
plasticity
proteins
allows
subsequent
creation
platforms
diverse
configurations,
offering
additional
spatial
flexibility
encoding.
It
demonstrated
this
framework
exhibits
versatile,
multilevel,
high‐capacity
spaces,
representing
innovative
solution
bolster
measures
against
counterfeiting
future
technologies.
Micromachines,
Год журнала:
2024,
Номер
15(6), С. 808 - 808
Опубликована: Июнь 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.
Advanced Optical Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Авг. 31, 2024
Abstract
The
self‐assembled
cellulose
nanocrystal
(CNC)
film
has
a
left‐handed
layered
structure,
which
makes
the
reflection
of
right‐handed
circularly
polarized
(CP)
light
challenge.
Herein,
nematic
phase
layer
is
designed
and
inserted
into
chiral
organization,
to
work
as
half‐wave
retarder
make
ambidextrous
CP
reflection.
maximum
reflectivity
exceeds
80%,
breaks
50%
limitations
single‐direction
current
in
all
reported
CNC‐based
films.
This
“sandwich‐like”
structure
displays
different
optical
properties
on
both
sides,
displayed
chromatism
inversion
circular
dichroism
signals.
dual
direction‐dependent
phenomena
are
reserved
synthesized
luminescence
(CPL)
film,
with
dissymmetry
factor
(
g
lum
)
−0.4245.
However,
this
luminescent
intensity
emission
not
enough
advanced
systems.
designs
triple
CPL
amplification
path
develops
handedness
strategy,
−1.0551
0.4082.
Then,
dual‐directional
films
designed,
where
optics
can
be
switched
on‐demand.
Finally,
photonic
crystal
applied
anti‐counterfeit
superstructure
induction.
ACS Nano,
Год журнала:
2024,
Номер
18(43), С. 29978 - 29990
Опубликована: Окт. 17, 2024
Rare-earth
oxyfluoride
(REOF)
colloidal
nanocrystals
(NCs)
suffer
from
a
low
photoluminescence
efficiency
due
to
their
small
size
with
poor
crystallinity
and
detrimental
surface
quenching
effect.
Herein,
we
introduce
an
innovative
approach
that
involves
doping
sodium
ions
into
REOF
NCs
produce
monodisperse,
size-controllable,
well-crystallized,
highly
luminescent
core/shell
NCs.
The
Na+
allows
for
successfully
synthesizing
the
cubic
tunable
6
30
nm.
Further
fabrication
of
doped
results
in
enhancements
up
1062
(Ho3+),
1140
(Er3+),
2212
(Tm3+)
folds
upconversion
luminescence
17.7
(Er3+)
downconversion
compared
without
ions.
These
were
subsequently
developed
multicolor
inks,
demonstrating
significant
potential
application
information
security,
used
near-infrared-IIb
(NIR-IIb)
(1500–1700
nm)
vivo
imaging,
which
exhibits
high-resolution
dynamic
imaging
capability
signal-to-noise
ratio
5.28.
present
way
controlled
synthesis
efficient
LuOF:
RE3+/LuOF
NCs,
expanding
toolkit
rare-earth
diverse
applications
such
as
advanced
encoding
encryption,
varied
fluorescence
biomedicine.
Advanced Functional Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 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.
Liquid Crystals,
Год журнала:
2024,
Номер
unknown, С. 1 - 10
Опубликована: Ноя. 11, 2024
Cholesteric
liquid
crystal
(CLC)
is
particularly
remarkable
due
to
its
ability
exhibit
structural
colour.
Structural
colour
materials
offer
solutions
for
information
encryption
that
feature
good
stability,
ease
of
perceivability,
and
arbitrary
patterns.
This
work
investigates
the
temperature-dependent
variation
CLC
provides
a
quantitative
analysis
pitch
helix
twist
power
(HTP)
at
different
temperatures,
further
exploring
potential
applications
in
encryption.
By
recording
quick
response
(QR)
code
patterns
LC
Polymer
cell,
single-pattern
dual-pattern
cells
are
prepared,
their
demonstrated.
The
QR
pattern
will
be
hidden
or
revealed
as
temperature
changes
by
cell.
Additionally,
requires
polarisers
address
crosstalk
issue
under
white
light,
making
cell
safer
solution
access
control
systems.
These
results
lay
theoretical
foundation
stimulus-responsive
colours
valuable
insights
security
anti-counterfeiting
applications.
