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.
Optical
multiplexing
technologies,
which
integrate
multiple
optical
channels
based
on
photonic
structures,
offer
a
significant
solution
for
high-capacity
information
storage
and
advanced
encryption.
However,
these
materials
are
limited
by
their
inherent
unswitchable
chiral
result
in
restricted
control
over
the
spatial
distribution
of
light.
Here,
we
propose
to
construct
an
integrating
optical-multiplexed
structure
using
tunable
1D
crystals
orientation
texture
via
combined
self-assembly
shear-aligning
approach.
In
this
system,
created
diverse
ethyl
cellulose
(EC)
offers
wide
range
light
modulations
through
phase
retardation.
When
with
chromatic
layer
formed
EC,
wavelength
polarization
achieved.
Notably,
due
identical
components
modulation
crystal
layers,
traceless
interface
between
them
ensures
both
high
confidentiality
durability.
By
leveraging
hierarchical
slices
well-defined
states
structural
colors
created,
enabling
construction
platform
multiplexed
multichannel
3D
4D
This
study
presents
promising
strategy
develop
traceless,
highly
confidential
units
controllable
color
encryption
technologies.
Abstract
Bio‐inspired
in
nature,
using
nanomaterials
to
fabricate
the
vivid
bionic
structural
color
and
intelligent
stimulus
responsive
interface
as
smart
skin
or
optical
devices
are
widely
concerned
remain
a
huge
challenge.
Here,
flexible
film
is
designed
fabricated
with
chiral
nanointerface
tunable
hydrophilic–hydrophobic
by
ultrasonic
energy
perturbation
strategy
crosslinking
of
cellulose
nanocrystals
(CNC).
An
adjustable
hydrophilic
hydrophobic
properties
constructed
supramolecular
assembly
ionic
liquid
molecule.
The
possessed
variable
hydrophilic–hydrophobic,
responsive,
robust
iridescent
color.
reflective
wavelength
helical
pitch
can
be
easily
modulated
through
strategy.
covalent
cross‐linking
has
excellent
robustness,
good
elasticity
flexibility.
brilliant
attributed
surface
charge
change
CNC
photonic
crystal,
which
disturbed
perturbation.
structure
response
properties.
materials
have
potential
applications
skin,
devices,
materials,
robots,
anti‐counterfeiting,
colorful
displays,
stealth
materials.
ABSTRACT
Cholesteric
liquid
crystal
(CLC)
materials
with
broadband
reflective
properties
have
garnered
much
attention
because
of
their
light‐selective
properties.
In
this
study,
films
were
prepared
by
doping
a
novel
UV
absorber,
ZIF‐8,
into
CLC
system
to
take
advantage
the
formation
intensity
gradient.
The
effects
ZIF‐8
content,
C6M
intensity,
irradiation
time,
and
diffusion
temperature
on
reflection
bandwidth
samples
systematically
investigated.
was
expanded
from
277
429
nm
under
optimum
conditions.
addition,
ZIF‐8‐doped
not
only
IR
thermal
control
shielding
capabilities
but
also
optical
property
third‐order
nonlinear
saturable
absorption,
which
makes
preparation
multifunctional
possible.
above
results
show
that
developed
thin
broad
application
prospect
in
building
energy
saving,
protection,
laser
protection.
ACS Applied Materials & Interfaces,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 17, 2025
With
the
rapid
advancement
of
modern
communication
technologies,
safeguarding
information
against
forgery
and
unauthorized
access
has
become
increasingly
critical,
driving
interest
in
advanced
optical
encryption
systems.
These
systems
excel
parallel
image
data
processing,
enabling
swift
detection
verification
sensitive
information.
However,
traditional
light-based
encoding
methods
are
constrained
by
their
limited
dependence
on
static
parameters
such
as
light
wavelength
intensity
lack
dynamic,
reversible
adaptability.
To
overcome
these
limitations,
we
propose
an
cryptography
system
that
utilizes
tunable
color
polarization
selectivity
situ
polymerized,
multicolor
patterned
chiral
liquid
crystals.
This
capitalizes
multifunctional
properties
crystals,
including
thermally
induced
phase
transitions
allow
repeatable
tuning,
rendering
encoded
unidentifiable
until
specific
conditions
met.
Furthermore,
incorporates
disguising
mechanisms
through
separation,
revealing
accurate
only
under
predefined
conditions.
Key
to
its
enhanced
functionality
is
integration
circular
selectivity,
electrically
switchable
separation.
feature
facilitates
display
distinct
right-
or
left-handed
circularly
polarized
light.
By
exploiting
dynamic
our
offers
a
multilevel
platform
significantly
enhances
security.
versatile
approach
surpasses
limitations
conventional
methods,
providing
robust
solution
for
secure
anticounterfeiting
applications.
Advanced Functional Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 2, 2025
Abstract
This
study
presents
nanosized
metal‐organic
framwork
(nanoMOF)‐based
multifunctional
mixed‐matrix‐membranes
(MMMs)
and
composite
powders
as
extremely
sensitive
responder
materials
for
a
responder‐stimulus
based
multilevel
anti‐counterfeiting.
The
physicochemical
properties
of
nanoMOF‐based
composites
offer
wide
operational
range
anti‐counterfeiting
tags.
Nine
are
presented,
constituted
trivalent
lanthanide‐containing
nanoMOFs
([Ln
3
(bdc)
4.5
(H
2
O)
(dmf)
]
(nLn‐bdc);
bdc
2−
═benzene‐1,4‐dicarboxylate;
Ln═Eu,
Tb,
Yb)
polystyrene
sulfonate,
pyrolyzed
resorcinol‐formaldehyde
polysulfone
matrices.
These
inherit
distinct
properties,
their
combination
provides
visible
near‐infrared
light
emission
specific
conductivity
multiple
security
level
additive
interdependent
nature
features
in
the
developed
ensures
that
altering
one
feature
will
invariably
affect
others,
thereby
reinforcing
overall
integrity
resilience
mechanism.
Even
pitch‐black
nLn‐bdc
show
bright
to
range,
when
stimulated
by
UV‐light
being
suitable
black
materials.
work
also
describes
matrix‐based
active
contribution
an
tag,
instead
solely
used
carrier
feature‐bearing
nanoMOFs.
levels
different
marks
these
complicated
copy
including
proof‐of‐principle
experiment.
ABSTRACT
Hydroxypropyl
cellulose
(HPC),
a
derivative
with
biocompatibility,
edibility,
and
exceptional
solubility
in
many
polar
solvents,
holds
significant
potential
for
biomedical
applications.
Within
specific
concentration
range,
HPC
undergoes
self‐assembly
to
form
cholesteric
liquid
crystals,
which
display
distinct
structural
colors.
These
colors
result
from
the
interaction
between
incident
light
periodic
nano‐architecture
of
HPC,
providing
long‐lasting
visual
effects
that
can
be
dynamically
adjusted
by
factors
such
as
concentration,
temperature,
functional
additives.
This
review
includes
mechanisms
underlying
genesis
regulation
HPCs
while
summarizing
advanced
techniques
fabricating
HPC‐based
materials
diverse
configurations.
Furthermore,
through
representative
examples,
we
highlight
multifaceted
applications
these
sensors,
bionic
skins,
drug
delivery,
anti‐counterfeiting
labels.
We
also
propose
strategies
address
current
research
application
challenges
goal
exploring
color
scientific
breakthroughs
societal
well‐being.
hope
this
catalyzes
materials’
advancement
future
