The Journal of Physical Chemistry Letters,
Год журнала:
2024,
Номер
15(18), С. 4965 - 4975
Опубликована: Май 1, 2024
Conjugated
and
processable
self-standing
vinylene-linked
covalent
organic
framework
membranes
(COFMs)
are
highly
demanding
for
photonics
optoelectronics.
In
this
work,
we
have
fabricated
the
first
cyclotriphosphazene
(CTP)
cored
COFM
(CTP-PDAN).
For
comparison
purposes,
successfully
imine-linked
congener
(CTP-PDA).
Leveraging
inherent
nonlinear
optical
(NLO)
response
of
CTP
core,
both
were
directly
mounted
to
evaluate
NLO
parameters
using
open-aperture
(OA)
Z-scan
technique.
Direct
measurement
responses
on
is
advantageous
free
from
solvent
scattering
effects,
making
it
a
more
practical
approach
compared
conventional
dispersion
mode.
The
OA
transmission
yields
reverse
saturable
absorption
signature
exhibiting
higher
coefficient
(β)
58.37
cm/GW
CTP-PDAN,
that
CTP-PDA
(β
=
8.5
cm/GW).
These
results
can
be
correlated
efficient
conjugation
through
vinylene
linkage
in
CTP-PDAN
imine
linked
congener.
Advanced Functional Materials,
Год журнала:
2023,
Номер
33(26)
Опубликована: Март 27, 2023
Abstract
Oil–water
separation
membranes
easily
fail
to
oil
foulants
with
low
surface
energy
and
high
viscosity,
which
severely
limits
these
membranes’
applications
in
treating
oily
wastewater.
Herein,
an
oil–water
membrane
by
bioinspired
bubble‐mediated
antifouling
strategy
is
fabricated
via
growing
hierarchical
cobalt
phosphide
arrays
on
stainless
steel
mesh.
The
as‐prepared
superhydrophilic/superaerophobic
electrocatalytic
for
hydrogen
evolution
under
water,
helps
rapidly
generate
release
abundant
microbubbles
surrounding
the
oil‐fouled
region
membrane.
These
can
spontaneously
coalesce
increase
their
buoyancy
warp
interface
tension
morphing
shape.
And
this
spontaneous
coalescence
also
increases
kinetic
of
resulting
from
decreased
bubbles’
potential
energy.
synergy
warped
tension,
increased
buoyancy,
drives
efficiently
dynamic
This
even
remove
some
solid
sediment
such
as
sand
particles
that
causes
more
serious
fouling
Thus,
maintains
flux
(>11920
L
m
−2
h
−1
bar
)
long‐term
oil–sand–water
emulsions
dynamically
recovering
decayed
demand,
exhibits
great
industrial
Advanced Materials,
Год журнала:
2023,
Номер
36(1)
Опубликована: Апрель 4, 2023
Abstract
2D
covalent
organic
frameworks
(2D
COFs)
are
attractive
candidates
for
next‐generation
membranes
due
to
their
robust
linkages
and
uniform,
tunable
pores.
Many
publications
have
claimed
achieve
selective
molecular
transport
through
COF
pores,
but
reported
performance
metrics
similar
networks
vary
dramatically,
in
several
cases
the
experiments
inadequate
support
such
conclusions.
These
issues
require
a
reevaluation
of
literature.
Published
examples
liquid‐phase
separations
can
be
broadly
divided
into
two
categories,
each
with
common
characteristics:
polycrystalline
films
(most
>1
µm
thick)
weakly
crystalline
or
amorphous
<500
nm
thick).
Neither
category
has
demonstrated
consistent
relationships
between
designed
pore
structure
separation
performance,
suggesting
that
these
imperfect
materials
do
not
sieve
molecules
uniform
In
this
perspective,
rigorous
practices
evaluating
membrane
structures
described,
which
will
facilitate
development
toward
molecularly
precise
capable
performing
previously
unrealized
chemical
separations.
absence
more
standard
proof,
reports
COF‐based
should
treated
skepticism.
As
methods
control
polymerization
improve,
polymer
may
exhibit
exquisite
energy
efficient
relevant
contemporary
challenges.
Nature Communications,
Год журнала:
2023,
Номер
14(1)
Опубликована: Сен. 22, 2023
3D
ionic
covalent
organic
framework
(COF)
membranes,
which
are
envisioned
to
be
able
break
the
trade-off
between
ion
conductivity
and
selectivity,
waiting
for
exploitation.
Herein,
we
report
fabrication
of
a
sulfonic
acid-functionalized
COF
membrane
(3D
SCOF)
efficient
selective
transport,
using
dual
acid-mediated
interfacial
polymerization
strategy.
The
SCOF
membranes
possess
highly
interconnected
transport
channels,
ultramicroporous
pore
sizes
(0.97
nm),
abundant
sulfonate
groups
(with
high
exchange
capacity
4.1
mmol
g-1),
leading
proton
843
mS
cm-1
at
90
°C.
When
utilized
in
osmotic
energy
conversion,
power
density
21.2
W
m-2,
remarkable
selectivity
0.976
thus
an
exceptional
conversion
efficiency
45.3%
simultaneously
achieved.
This
work
provides
alternative
approach
promotes
applications
COFs
separation.
Abstract
Covalent
organic
frameworks
(COFs)
are
porous
crystalline
polymeric
materials
formed
by
the
covalent
bonding
of
units.
The
abundant
units
library
gives
COFs
species
diversity,
easily
tuned
pore
channels,
and
sizes.
In
addition,
periodic
arrangement
endows
regular
highly
connected
which
has
led
to
rapid
development
in
membrane
separations.
Continuous
defect‐free
high
crystallinity
COF
membranes
is
key
their
application
separations,
most
important
issue
be
addressed
research.
This
review
article
describes
linkage
types
bonds,
synthesis
methods,
size
regulation
strategies
materials.
Further,
preparation
continuous
highlighted,
including
layer‐by‐layer
(LBL)
stacking,
situ
growth,
interfacial
polymerization
(IP),
solvent
casting.
applications
separation
fields
also
discussed,
gas
separation,
water
treatment,
nanofiltration,
ion
conduction,
energy
battery
membranes.
Finally,
research
results
summarized
future
prospect
for
outlined.
More
attention
may
paid
large‐scale
conductive
Angewandte Chemie International Edition,
Год журнала:
2023,
Номер
62(23)
Опубликована: Март 13, 2023
Dynamic
covalent
chemistry
(DCC)
opens
up
a
fascinating
route
for
the
construction
of
well-organized
supramolecular
architectures,
starting
from
organic
molecular
cages
to
crystalline
macromolecular
frameworks
(COFs).
Herein,
first
time,
we
have
manifested
facile
room-temperature
DCC-directed
transformation
discrete
imine
cage-to-COF
film
at
liquid-liquid
interface.
The
unfolding
cage
leading
generation
intermediates,
followed
by
their
interface-assisted
preorganization
and
subsequent
growth
COF
film,
are
elucidated
through
detailed
spectroscopic
microscopic
investigations.
interfacial
provides
faster
fabrication
free-standing
films
with
high
porosity
crystallinity,
demonstrating
excellent
performance
towards
sieving
solvent
permeance.
Thus,
current
study
new
structural
interconversion
between
two
entities
diverse
dimensionality
employing
DCC
confined
Colloids and Interface Science Communications,
Год журнала:
2024,
Номер
59, С. 100772 - 100772
Опубликована: Фев. 15, 2024
Oily
wastewater
can
have
a
great
impact
on
human
health
and
the
surrounding
environment.
The
current
methods
for
treating
oily
mainly
included
physical
methods,
chemical
membrane
separation
technology
other
mechanical
methods.
Compared
with
had
advantages
of
high
efficiency,
low
cost,
simple
operation,
energy
saving
environmental
protection
in
separating
general
oil-water
emulsions,
thus
having
wide
application
prospect.
In
order
to
understand
materials
separation,
such
as
improving
structure,
strength
structural
stability
aqueous
solutions,
this
paper
discussed
mechanism
by
different
(inorganic
membranes,
organic
membranes
emerging
membrane).
latest
research
progress
various
types
strategies
performance
modification
were
introduced
analyzed.
end,
future
development
direction
was
summarized.
will
be
focused
reducing
cost
preparation,
pollution
environment,
using
natural
materials,
developing
molecular-level
anticontamination,
exploring
more
stable
surface
quantitatively
analyzing
influence
structure
surface-water-pollutant
interactions
at
molecular
level.
Angewandte Chemie International Edition,
Год журнала:
2022,
Номер
61(13)
Опубликована: Янв. 24, 2022
The
ordered
open
organic
frameworks
membranes
are
attractive
candidates
for
flow-assisted
molecular
separations.
physicochemical
properties
of
such
mostly
depend
on
their
selectively
chosen
functional
building
blocks.
In
this
work,
we
have
introduced
a
novel
concept
switchability
three-dimensional
covalent
framework
(3D-COF)
through
simple
solvent-influenced
fragmentation
method.
This
room-temperature
interfacial
synthesis
provides
free-standing
3D-COF
with
distinct
from
the
same
monomers.
Notably,
change
solvent
chloroform
to
ethyl
acetate
switches
membrane
property
hydrophilic
(water
contact
angle
60°)
hydrophobic
142°)
nature.
passes
oil
molecules
an
oil-water
emulsion
gravitational
flux
1536
L
m-2
h-1
.
