Nano Letters,
Journal Year:
2024,
Volume and Issue:
24(21), P. 6296 - 6301
Published: May 15, 2024
Ion
transport
through
nanoporous
two-dimensional
(2D)
membranes
is
predicted
to
be
tunable
by
controlling
the
charging
status
of
membranes'
planar
surfaces,
behavior
which
though
remains
assessed
experimentally.
Here
we
investigate
ion
intrinsically
porous
made
2D
metal-organic-framework
layers.
In
presence
certain
cations,
observe
a
linear-to-nonlinear
transition
ionic
current
in
response
applied
electric
field,
analogous
cation
gating
effect
biological
channels.
Specifically,
currents
saturate
at
transmembrane
voltages
exceeding
few
hundreds
millivolts,
depending
on
concentration
cations.
This
attributed
binding
cations
tuning
states
there
and
affecting
entry/exit
process
translocating
ions.
Our
work
also
provides
as
candidates
for
building
nanofluidic
devices
with
properties.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
34(36)
Published: March 30, 2024
Abstract
Through
evolution,
biological
organisms
have
developed
ways
to
sense
light
using
ion
channels,
which
holds
several
advantages,
such
as
energy
efficiency
and
water
resistance,
over
humanmade
optoelectronic
devices.
Herein,
a
retina‐inspired
nanofluidic
system
is
presented
with
Janus
heterogeneous
membrane
(J‐HM),
can
achieve
underwater
visual
imaging
through
light‐driven
active
transport.
The
J‐HMs
are
obtained
sequentially
assembled
WS
2
,
kind
of
metal–organic
framework
nanosheets
via
the
reaction
between
2,3,6,7,10,11‐hexahydroxytriphenylene
hydrate
(HHTP)
Cu
2+
(Cu‐HHTP).
Due
formed
intramembrane
electric
field
caused
by
efficient
charge
separation
under
illumination,
photovoltaic
driving
force
generated
for
transport
from
Cu‐HHTP
.
Furthermore,
unidirectionally
be
enhanced
self‐diffusion
concentration
gradient.
J‐HM
single‐pixel
design
shows
nearly
linear
response
intensity
has
enough
resolution
basic
object
recognition
well
long‐term
memory
after
data
processing
defined
pixelated
matrix,
pave
an
avenue
designing
more
intelligent
sensing
systems.
Accounts of Materials Research,
Journal Year:
2023,
Volume and Issue:
4(9), P. 786 - 797
Published: Aug. 1, 2023
ConspectusThe
smart
regulation
of
ion
flow
in
biological
channels
(BICs)
is
vital
to
life.
In
general,
intelligent
BICs
possess
three
main
functions:
(i)
selectively
transfer
specific
ions,
(ii)
quickly
conduct
and
(iii)
responsively
control
the
ions.
Since
early
exploration
potassium
(K+)
sodium
(Na+)
began
1950s,
gating
behaviors
have
been
investigated
for
more
than
70
years.
Taking
first
reported
voltage-gated
transport
process
as
an
example,
a
gate,
which
acts
voltage
sensor
BICs,
detects
variation
membrane
voltage,
triggering
opening
closing
channels.
A
ratio
(GR)
can
describe
effect
BIC,
GR
=
IOpen/IClosed,
where
IOpen
IClosed
are
measured
currents
channel
at
open
closed
states,
respectively.
usually
strong
effects
with
extraordinarily
high
ratio,
be
up
infinity
zero-current
states.
Inspired
by
nature,
artificial
(AICs)
constructed
permeation
intelligently.
2004,
wide
range
AICs
developed
regulate
ions
via
external
stimulation
(i.e.,
light,
pH,
magnetic
field,
temperature).
These
nanochannels,
intrinsic
or
guest
functionalities
that
responsive
environmental
simulation,
drive
However,
performances
such
nanoscale
ratios
between
1
30)
far
below
those
due
relatively
larger
nanopores
AICs,
cannot
entirely
block
off
Over
past
decade,
emerging
advanced
materials
1D
nanotubes,
2D
nanosheets,
1D-3D
sub-nanoporous
frameworks)
sub-nanometer
pores
stimuli-responsive
properties
provided
promising
tools
fabricate
sub-nanofluidic
efficient
performance.
remarkably
comparable
their
counterparts,
because
confined
spaces
enable
effective
state
Our
team
has
series
based
on
metal–organic
frameworks,
covalent
organic
nanosheets.
exhibit
much
higher
on–off
nanofluidic
do,
maintained
over
ionic
concentrations.
Moreover,
also
show
stimuli-tunable
selectivity
blockage
effects.
Therefore,
this
Account
summarizes
recent
progress
fabrication
functionalization
methods
constructing
sub-nanoscale
then
compare
principles
sub-nanochannels
before
discussing
unique
large
effect,
selectivity,
applicable
concentration
range).
Next,
applications
channels/membranes
sensing
energy
harvesting,
adsorption,
separation
presented.
Finally,
we
offer
perspective
future
development
further
improve
performance
real-world
devices.
Journal of Materials Chemistry A,
Journal Year:
2023,
Volume and Issue:
11(25), P. 13223 - 13230
Published: Jan. 1, 2023
UiO-66-type
amphoteric
metal–organic
frameworks
(MOFs)
containing
both
amino
and
carboxylic
groups
are
synthesized
grown
within
PET
subnanochannels
to
investigate
the
influence
of
functional
on
cation/anion
ion
transport
properties.
ACS Materials Letters,
Journal Year:
2023,
Volume and Issue:
6(2), P. 461 - 465
Published: Dec. 29, 2023
Light-responsive
proton
conductors,
which
emulate
biological
pumps,
have
garnered
significant
research
attention
due
to
their
wide-ranging
applications
in
bioelectronics
and
smart
devices.
Herein,
we
demonstrate
the
first
example
of
functionalization
cluster-nodes
a
metal–organic
framework
(MOF)
for
attaining
light-responsive
conduction.
Specifically,
photoactive
molecules
azobenzene-4,4′-dicarboxylic
acid
(AZOA)
are
grafted
onto
Zr6(μ3-O)4(μ3-OH)4
nodes
MOF-808
through
partial
substitution
terminal
formates,
giving
MOF-808-AZOA.
Remarkably,
MOF-808-AZOA
exhibits
switchable
conduction
responsive
UV
light,
featuring
substantial
ON/OFF
ratio,
rapid
response
time,
good
reversibility.
Molecular
simulations
indicate
that
is
attributed
differential
interactions
between
terminated
formates
−COOH
group
AZOA
with
its
cis-
or
trans-configuration.
Given
diversity
cluster-based
MOFs,
this
study
opens
up
promising
avenue
realizing
stimuli-responsive
proton-conducting
MOFs
cluster-node
functionalization.
Physics of Fluids,
Journal Year:
2024,
Volume and Issue:
36(11)
Published: Nov. 1, 2024
Soft
bipolar
nanochannels
provide
distinct
and
valuable
understanding
of
the
intricate
relationship
among
shape,
charge
distribution,
concentration,
flow
dynamics.
This
study
investigates
intriguing
realm
nanoscale
structures,
where
two
configurations
soft
layers
with
varying
charges
an
but
appealing
setting
for
movement
management
ions,
as
well
regulation
control
ionic
species
in
five
various
geometries.
It
generates
cylindrical,
trumpet,
dumbbell,
hourglass,
conical
forms.
The
are
coated
a
diffuse
polyelectrolyte
layer,
density
distribution
layer
is
described
using
step
function.
To
enhance
accuracy,
impact
partitioning
taken
into
account.
investigate
effect
polarity,
types
were
considered:
Type
I
II.
In
I,
negative
pole
at
start,
while
II,
positive
start.
Thus,
features
arrangement
negative–positive
(NP),
whereas
II
has
positive–negative
(PN)
configuration.
research
was
conducted
under
stationary
conditions
finite
element
method,
Poisson–Nernst–Planck,
Navier–Stokes
equations.
By
manipulating
variables
such
order,
bulk
numerical
analysis
performed
to
these
on
current–voltage
parameters.
results
demonstrate
serves
more
effective
receiver
generating
greater
rectification.
For
instance,
dumbbell-shaped
nanochannel
exhibits
rectification
2046
concentration
1
mM
lowest
layer.
From
alternative
perspective,
conductivity
significantly
influenced
by
concentration.
study's
findings
fundamental
principles
have
profound
implications
diverse
applications
nanochannels.
capacity
regulate
manipulate
ion
transport
through
can
result
enhanced
efficiency,
selectivity,
performance
processes.
Chemical Engineering Journal,
Journal Year:
2023,
Volume and Issue:
476, P. 146649 - 146649
Published: Oct. 14, 2023
Metal-organic
frameworks
(MOFs)
with
high-density
sub-nanometer
pores
and
plenty
of
charged
functional
groups
are
ideal
candidates
for
salinity
gradient
energy
harvesting.
However,
synthesizing
flexible
scalable
MOF
membranes
high
performance
harvesting
remains
a
challenge.
Here
we
develop
vertically
aligned
UiO-66-(COOH)2/polyethylene
terephthalate
(PET)
The
PET/UiO-66-(COOH)2
fabricated
by
growing
UiO-66-(COOH)2
crystals
into
nanochannels
the
PET
via
nanoconfined
interfacial
growth
method.
as-synthesized
improved
cation
selectivity
over
membranes.
produce
power
density
1.3
W
m−2
under
0.5
M/0.01
M
KCl
solutions,
which
is
better
than
performances
thickness
10
µm.
This
work
demonstrates
that
MOFs-functionalized
flexibility,
scalability,
ion
promising
Small Methods,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 18, 2025
Abstract
To
mimic
the
neural
functions
of
human
brain,
developing
hardware
with
natural
similarities
to
nervous
system
is
crucial
for
realizing
neuromorphic
computing
architectures.
Owing
their
capability
emulate
artificial
neurons
and
synapses,
memristors
are
widely
regarded
as
a
leading
candidate
achieving
computing.
However,
most
current
memristor
devices
solid‐state.
In
contrast,
biological
systems
operate
within
an
aqueous
environment,
brain
accomplishes
intelligent
behaviors
such
information
generation,
transmission,
memory
by
regulating
ion
transport
in
neuronal
cells.
achieve
that
more
analogous
energy‐efficient,
based
on
liquid
environments
developed.
contrast
traditional
solid‐state
memristors,
liquid‐based
possess
advantages
anti‐interference,
low
energy
consumption,
heat
generation.
Simultaneously,
they
demonstrate
excellent
biocompatibility,
rendering
them
ideal
option
next
generation
intelligence
systems.
Numerous
experimental
demonstrations
reported,
showcasing
unique
memristive
properties
novel
functionalities.
This
review
focuses
recent
developments
discussing
operating
mechanisms,
structures,
functional
characteristics.
Additionally,
potential
applications
development
directions
proposed.
Zirconium-based
metal-organic
frameworks
(Zr-MOFs)
have
emerged
as
a
promising
class
of
crystalline
porous
materials,
attracting
significant
interest
in
the
field
proton
conduction
due
to
their
exceptional
chemical
stability,
structural
flexibility,
and
functional
tunability.
Notably,
proton-conducting
Zr-MOFs
show
immense
potential
for
diverse
advanced
technological
applications.
In
this
Spotlight
on
Applications
paper,
we
provide
an
overview
spotlight
recent
progress
utilization
exchange
membranes
membrane
fuel
cells
(PEMFCs),
light-responsive
systems
pumps,
sensors
formic
acid
detection.
Furthermore,
also
discussed
challenges,
future
prospects,
opportunities
promoting
application
Zr-MOFs.