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.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
34(24)
Published: Feb. 21, 2024
Abstract
Photochromic
materials
have
drawn
enormous
attention
for
their
potential
applications
in
optical
memory
storage
and
photoswitchable
molecular
devices.
Although
great
achievements
photochromic
been
fulfilled,
it
is
still
a
big
challenge
to
realize
gated
photochromism
ready
tunable
properties.
In
previous
studies,
rare
examples
of
are
reported.
Herein,
three
triarylethylene
derivatives
FTrPE‐
o
I,
ClTrPE‐
I
BrTrPE‐
with
reversible
thermally
activated
characteristics
designed
synthesized,
whose
crystalline
powders
show
no
until
treatments
relative
temperature.
Temperature
acts
as
gate
switch
the
properties
by
switching
aggregation
state
from
melted
amorphous.
With
this
progress,
broader
structural
realm
becomes
accessible
materials,
which
can
now
be
synthetically
tailored
advanced
future
applications,
e.g.,
research
on
machines
switches,
studies
photoisomerization
mechanisms,
or
generation
thermal
tracing
materials.
To
showcase
these
distinct
encrypted
printing,
trace
monitoring
well
multi‐level
anticounterfeiting
demonstrated,
addition
comprehensive
photochemical
study
all
compounds.
Angewandte Chemie International Edition,
Journal Year:
2024,
Volume and Issue:
63(15)
Published: Feb. 10, 2024
Organic
single
crystals
quickly
emerge
as
dense
yet
light
and
nearly
defect-free
media
for
emissive
elements.
Integration
of
functionalities
control
over
the
properties
is
currently
being
explored
a
wide
range
these
materials
to
benchmark
their
performance
against
organic
diluted
in
powders
or
films.
Here,
we
report
mechanically
flexible
chiral
capable
an
unprecedented
combination
fast,
reversible,
low-fatigue
responses.
UV-excited
both
enantiomers
material,
4-chloro-2-(((1-phenylidene)imino)methyl)phenol,
exhibit
drastic
reversible
change
emission
color
from
green
orange-yellow
within
second
can
be
cycled
at
least
2000
times.
The
photoresponse
was
found
depend
strongly
on
excitation
intensity
temperature.
Combining
chirality,
mechanical
compliance,
rapid
switching,
multiple
responses,
writability
by
UV
light,
this
material
provides
unique
versatile
platform
developing
crystal-based
on-demand
signal
transfer,
information
storage,
cryptography.
Journal of the American Chemical Society,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 8, 2025
The
development
of
new
photochromic
systems
is
motivated
by
the
possibility
controlling
properties
and
functions
materials
with
high
spatial
temporal
resolution
in
a
reversible
manner.
While
there
are
several
classes
photoswitches
operating
solution,
design
efficiently
solid
state
remains
highly
challenging,
mainly
due
to
limitations
related
confinement
effects.
Triaryl-hydrazones
represent
relatively
subclass
bistable
hydrazone
exhibiting
efficient
Z/E
photochromism
solution.
As
"large
volume"
photoswitches,
they
have
been
anticipated
display
only
limited
solid-state
photoswitching.
Here,
we
show
that
Z
isomers
newly
prepared
triaryl-hydrazones
containing
perfluorinated
hydrazine
phenyl
ring
(PHZs)
exhibit
impressive
an
unexpected
light-induced
red-shift
absorption
maximum.
Based
on
(time-dependent)
density
functional
theory
calculations,
photoswitching
reaction
mechanism
involving
excited
intramolecular
proton
transfer
has
proposed,
which
rationalizes
observed
formation
metastable
structure.
Advanced
experimental
techniques
including
X-ray
diffraction,
NMR
EPR
spectroscopy,
confocal
Raman
microscopy
corroborated
suggested
revealed
superficial
phenomenon.
This
atypical
behavior
PHZs
can
also
be
realized
using
visible
light
form
thin
films,
manifests
their
potential
use
optics
optoelectronics.
Chemical Science,
Journal Year:
2023,
Volume and Issue:
14(40), P. 11121 - 11130
Published: Jan. 1, 2023
In
this
study,
we
synthesized
and
reported
the
heterotopic
bisnanohoops
P5-[8,10]CPPs
containing
cycloparaphenylenes
(CPPs)
a
pillar[5]arene
unit,
which
act
not
only
as
energy
donors
but
also
host
for
binding
acceptors.
We
demonstrated
that
series
of
elegant
FRET
systems
could
be
constructed
successfully
through
self-assembly
between
acceptors
with
different
emissions
via
host-guest
interaction.
These
further
allow
us
to
finely
adjust
(BODIPY-Br
Rh-Br)
achieving
multiple
color-tunable
emissions,
particularly
white-light
emission.
More
importantly,
these
complexes
were
utilized
in
fabrication
fluorescent
films
integrated
365
nm
LED
lamp
create
white
devices.
The
findings
highlight
new
application
carbon
nanorings
emission
materials,
beyond
common
recognition
π-conjugated
molecules.
Photochromic
polymer
is
defined
as
a
series
of
materials
based
on
photochromic
units
in
chains,
which
produces
reversible
color
changes
under
irradiation
with
particular
wavelength.
Currently,
the
research
progresses,
it
shows
increasing
potential
applications
various
fields,
such
anti-counterfeiting,
information
storage,
super-resolution
imaging,
and
logic
gates.
However,
there
paucity
published
reviews
topic
polymers.
Herein,
this
review
discusses
summarizes
progress
prospects
materials,
mainly
summarizing
basic
mechanisms,
classification,
azobenzene,
spiropyran,
diarylethene
Moreover,
3-dimensional
(3D)
printable
polymers
are
worthy
to
be
summarized
specifically
because
its
innovative
approach
for
practical
application;
meanwhile,
developing
3D
printing
technology
has
shown
opportunities
better
applications.
Finally,
current
challenges
future
directions
summarized.
