Although
fluorescent
hydrogels
have
been
gaining
significant
attention
for
their
potential
application
in
optical
encryption
owing
to
smart
responsiveness,
complex
preparation
processes
hindered
practical
applications.
This
paper
reports
the
fabrication
of
a
multicolor-tunable
hydrogel,
annotated
as
GA/ASA/Eu(PDA)3,
from
gelatin
(GA)
gel
matrix
addition
5-aminosalicylic
acid
(ASA)
and
lanthanide
(Eu(PDA)3)
centers.
Upon
UV
light
excitation,
ASA
emitted
blue-green
fluorescence,
while
Eu(PDA)3
showed
red
fluorescence.
The
difference
between
maximum
excitation
wavelengths
groups
was
approximately
100
nm.
Therefore,
fluorescence
color
GA/ASA/Eu(PDA)3
hydrogel
could
be
changed
red,
pink,
white,
blue,
or
blue
by
simply
altering
either
concentrations
wavelength.
Furthermore,
prepared
responsive
metal
ions,
energy
transfer
PDA
Eu3+
ions
interrupted
Cu2+
Mn2+,
thus
resulting
quenching
Finally,
designed
successfully
enabled
storage
encryption.
results
this
study
can
help
design
manufacturing
novel
materials
advanced
information
Deleted Journal,
Journal Year:
2024,
Volume and Issue:
2(1)
Published: Jan. 12, 2024
Abstract
Stimuli‐responsive
fluorescent
hydrogels
are
three‐dimensional
networked
polymeric
materials
with
tunable
luminescence
and
dynamic
properties,
which
play
an
important
role
as
a
water‐rich
soft
material
in
the
fields
of
information
encryption,
bionic
actuation,
bioimaging,
environmental
monitoring,
luminescent
materials.
Compared
conventional
hydrogels,
their
unique
properties
allow
visualization
microscopic
dynamics
within
polymer
network.
By
rational
inclusion
motifs,
such
photoswitches,
AIEgens,
lanthanide
complexes,
host–guest
these
endowed
tunability
emission,
shape,
phase
time
space
response
to
effectors.
In
this
review,
we
summarize
fabrication
strategies
that
mainly
used
by
recently
reported
stimuli‐responsive
applications
Small,
Journal Year:
2022,
Volume and Issue:
18(52)
Published: Nov. 4, 2022
Abstract
The
rapid
progress
of
information
technology
is
accompanied
by
plenty
embezzlement
and
forgery,
but
developing
advanced
encryption
technologies
to
ensure
security
remains
challenging.
Phase
separation
commonly
leads
a
dramatic
change
in
the
transmittance
hydrophilic
polymer
networks,
which
potential
method
for
often
neglected.
Here,
taking
polyacrylamide
(PAAm)
hydrogel
system
as
typical
example,
facilely
adjustable
decryption
via
its
regulable
phase
process
ethanol/water
mixed
solvent,
are
reported.
By
controlling
osmotic
pressure
external
internal
environment,
it
demonstrated
that
diffusion
coefficient
during
deswelling
reswelling,
well
corresponding
gel,
can
be
controlled.
Relatively
high
initial
gel
slow
remixing
phase‐separated
opening
opportunity
applying
reversible
device.
As
proof‐of‐concept
demonstrations,
several
stable
systems
making
use
gels
designed,
expected
inspire
development
next‐generation
soft
devices
technology.
Advanced Materials,
Journal Year:
2022,
Volume and Issue:
34(52)
Published: June 22, 2022
Abstract
Small‐scale
soft
robots
are
attracting
increasing
interest
for
visible
and
potential
applications
owing
to
their
safety
tolerance
resulting
from
intrinsic
bodies
or
compliant
structures.
However,
it
is
not
sufficient
that
the
merely
provide
support
system
protection.
More
importantly,
meet
demands
of
controllable
operation
real‐time
feedback
in
unstructured/complicated
scenarios,
these
required
perform
simplex
multimodal
functionalities
sensing,
communicating,
interacting
with
external
environments
during
large
dynamic
deformation
risk
mismatch
delamination.
Challenges
encountered
fabrication
integration,
including
selection
composite/materials
structures,
integration
active/passive
functional
modules
robust
interfaces,
particularly
highly
deformable
soft/stretchable
bodies.
Here,
methods
strategies
fabricating
structural
integrating
them
developing
small‐scale
investigated.
Utilizing
templating,
3D
printing,
transfer
swelling,
can
be
endowed
several
perceptual
capabilities
corresponding
diverse
stimulus,
such
as
light,
heat,
magnetism,
force.
The
sensing
effectively
enhances
agility,
adaptability,
universality
when
applied
various
fields,
smart
manufacturing,
medical
surgery,
biomimetics,
other
interdisciplinary
sciences.
Molecular Systems Design & Engineering,
Journal Year:
2022,
Volume and Issue:
7(9), P. 1017 - 1029
Published: Jan. 1, 2022
In
this
review,
we
give
an
overview
of
the
recent
advances
in
field
DLP
printing
hydrogels
with
emphases
on
materials
selection,
structure
designs,
and
representative
applications.
Materials Horizons,
Journal Year:
2023,
Volume and Issue:
10(7), P. 2496 - 2505
Published: Jan. 1, 2023
The
traditional
stored
information
is
statically
shown
on
single
2D
planes,
which
leads
to
low
storage
capacity
and
secondary
leakage
without
the
proper
handling
of
decrypted
information.
Developing
a
3D
multistage
encryption
platform
with
self-erasure
function
highly
desirable.
Here,
novel
bilayer
hydrogel
synergistic
deformation
fluorescence
color
(SDFC)
change
designed
for
encryption.
consisting
shape-deformable
layer
aggregation-induced
emission
(AIE)
properties
can
exhibit
pH-responsive
SDFC
change.
Fluorescence
be
ionoprinted
fluorescent
based
electrostatic
interactions
dynamic
covalent
bonds.
encoded
synergistically
produce
predesigned
shape
configuration
enhanced
background
wrap
information,
only
readable
after
sequential
recovery
disappearance
fluorescence.
Furthermore,
further
obtained
by
stepwise
decryption
due
differential
fading
rates.
displayed
automatically
self-erased
in
end,
avoiding
leakage.
This
study
paves
an
avenue
broadening
conventional
single-level
platforms
counterparts
multi-decryption
capabilities
hydrogel.
ACS Sustainable Chemistry & Engineering,
Journal Year:
2023,
Volume and Issue:
11(27), P. 10061 - 10073
Published: June 28, 2023
Luminescent
hydrogels
with
flexibility
and
biocompatibility
have
attracted
considerable
interest
in
anti-counterfeiting
application.
However,
conventional
luminous
substance
is
prone
to
release
into
the
surrounding
environment,
causing
accumulation
biotoxicity.
The
green
synthesis
of
repeatable
fluorescent
materials
from
biomass
remains
challenging.
Herein,
we
report
assembly
nano-cellulose
hydrogel
doped
naturally
originated
multiple
active
sited
carbon
dots
(CDs)
demonstrate
sustainable
usage
information
encryption.
problem
CDs
leaching
matrix
was
solved
via
strong
chemical
interactions
between
cellulose
nanofibers.
facilely
prepared
showed
extraordinary
mechanical
properties
fatigue
resistance
(i.e.,
stress,
compressive
modulus,
toughness
were
up
1607.30
kPa,
368.33
191.54
kJ/m3,
respectively).
Furthermore,
this
cellulose-based
gel
displayed
bright
fluorescence
under
UV
light,
which
could
be
quenched
by
Fe3+
ions
recovered
an
ascorbic
acid/EDTA-2Na
mixture
solution.
Therefore,
coded
can
easily
input
interpreted
ionoprinting
technique,
realizing
a
simple
display
erasing
procedure.
This
elaborately
designed
biomimetic
serve
as
effective
communication
media
improve
security
expand
critical
applications
optoelectronic
storage
devices.
Advanced Materials Technologies,
Journal Year:
2023,
Volume and Issue:
8(8)
Published: Jan. 30, 2023
Abstract
With
the
increasing
emphasis
on
information
security,
reliable
encryption
materials
have
been
urgently
desired.
Herein,
a
hydrogel‐based
dual
platform
with
self‐erasure
function
is
developed,
which
exhibits
both
high‐security
level
and
possibility
of
reuse.
Dual
realized
by
elegantly
combining
2D
fluorescent
pre‐written/printed
via
competitive
coordination
pH‐induced
shape
deformation
PSSA/PDEAEMA‐APA/Eu
3+
hydrogel.
On‐demand
decryption
concealed
immersing
in
solution
specific
pH
exposed
to
254
nm
irradiation,
fully
utilizes
simultaneous
recovery
fluorescence
quenching
prolong
immersion
time,
carried
self‐erases
permanently,
effectively
prevents
leakage
non‐recipient
further
ensures
security.
Thanks
reversible
pH‐responsive
behaviors
repeatable
ability,
could
recover
blank
plane
after
self‐erasure,
great
potential
encryption.
