Angewandte Chemie International Edition,
Journal Year:
2022,
Volume and Issue:
62(4)
Published: Nov. 29, 2022
Despite
significant
progress
on
the
design
and
synthesis
of
covalent
organic
frameworks
(COFs),
precise
control
over
microstructures
such
materials
remains
challenging.
Herein,
two
chiral
COFs
with
well-defined
one-handed
double-helical
nanofibrous
morphologies
were
constructed
via
an
unprecedented
template-free
method,
capitalizing
diastereoselective
formation
aminal
linkages.
Detailed
time-dependent
experiments
reveal
spontaneous
transformation
initial
rod-like
aggregates
into
microstructures.
We
have
further
demonstrated
that
helical
chirality
circular
dichroism
signal
can
be
facilely
inversed
by
simply
adjusting
amount
acetic
acid
during
synthesis.
Moreover,
transferring
to
achiral
fluorescent
molecular
adsorbents,
COF
nanostructures
effectively
induce
circularly
polarized
luminescence
highest
luminescent
asymmetric
factor
(glum
)
up
≈0.01.
Angewandte Chemie International Edition,
Journal Year:
2023,
Volume and Issue:
62(25)
Published: March 27, 2023
Water
scarcity
is
becoming
an
increasingly
pressing
issue
due
to
global
population
growth
and
industrialization.
One
effective
approach
addressing
this
sorption-based
atmospheric
water
harvesting
(SAWH).
Covalent
organic
frameworks
(COFs)
are
a
type
of
porous
crystalline
material
that
have
emerged
as
promising
sorbents
for
their
high
surface
area,
tunable
pore
size,
customizable
chemistry.
In
mini-review,
we
provide
overview
the
different
types
COFs,
structural
characteristics,
diverse
linkage
chemistries
used
construct
them.
Then,
summarize
recent
advances
in
using
COF-based
harvesting,
including
strategies
controlling
sorption
properties
optimizing
performance
terms
thermodynamics
dynamics.
Finally,
discuss
prospects
challenges
associated
with
improving
efficiency
SAWH
systems.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
34(21)
Published: Jan. 17, 2024
Abstract
The
use
of
inorganic
nanofillers
has
been
an
effective
method
to
improve
high‐temperature
capacitive
performance
dielectric
polymers,
though
there
are
unmet
challenges
such
as
undesirable
organic–inorganic
compatibility,
and
low
efficiencies
energy
densities.
Herein,
a
surface
functionalization
strategy
using
covalent
organic
frameworks
(COFs)
is
employed
address
in
realizing
high‐performing
polymer
composites.
Specifically,
core–shell
structured
nanoparticles,
where
ZrO
2
nanoparticles
act
the
core
COF
material
forms
shell,
constructed
composited
with
polyetherimide
(PEI)
matrix.
design
leverages
high
electron
affinity
(
E
A
)
outer
shell
create
traps,
thereby
capturing
free
charges
limiting
electrical
conduction.
Concurrently,
wide
bandgap
introduce
barriers
impede
charge
injection
migration.
This
orchestrated
“energy
level
cascade”
results
marked
reduction
leakage
current
loss.
resulting
composite
showcases
impressive
discharged
density
6.21
J
cm
−3
at
efficiency
above
90%,
maximum
reaching
7.43
150
°C.
These
metrics
position
PEI/ZrO
@COF
surpass
or
be
on
par
state‐of‐the‐art
PEI
composites
other
advanced
dielectrics.
Nature Communications,
Journal Year:
2023,
Volume and Issue:
14(1)
Published: June 23, 2023
Abstract
Controlling
the
number
of
molecular
switches
and
their
relative
positioning
within
porous
materials
is
critical
to
functionality
properties.
The
proximity
many
one
another
can
hinder
or
completely
suppress
response.
Herein,
a
synthetic
strategy
involving
mixed
linkers
used
control
distribution
spiropyran-functionalized
in
covalent
organic
framework
(COF).
COF
contains
spiropyran
each
pore
which
exhibits
excellent
reversible
photoswitching
behavior
its
merocyanine
form
solid
state
response
UV/Vis
light.
spiro-COF
possesses
an
urchin-shaped
morphology
morphological
transition
2D
nanosheets
vesicles
solution
upon
UV
light
irradiation.
merocyanine-equipped
COFs
are
extremely
stable
possess
more
ordered
structure
with
enhanced
photoluminescence.
This
approach
modulating
structural
isomerization
develop
inkless
printing
media,
while
photomediated
polarity
change
for
water
harvesting
applications.
NPG Asia Materials,
Journal Year:
2023,
Volume and Issue:
15(1)
Published: March 31, 2023
Abstract
Nanoarchitectonics
describes
the
integration
of
nanotechnology
with
other
fields
as
a
postnanotechnology
concept
that
elevates
it
to
material
science.
Based
on
this
fundamental
principle,
we
address
pore-engineered
nanoarchitectonics
application
targets
for
cancer
therapy
by
combining
basic
descriptions
and
exemplifying
applications
in
review.
The
initial
two
sections
briefly
summarize
basics
according
classification
based
(i)
porosity
(ii)
composition.
Afterward,
main
application-oriented
section—designing
mesoporous
therapy—is
presented.
Various
types
drug
delivery
systems,
including
nanoparticles
nanocarriers,
endogenous
stimuli-responsive
delivery,
exogenous
targeted
are
described.
Importantly,
clinical
translation
materials
is
further
discussed.
Mesoporous
unique
offer
network
cavities
vehicles
nanocarriers.
Regarding
developments
allow
be
broadly
used
settings,
there
several
challenges
should
solved
their
application.
From
perspective,
tremendous
processes
development
materials.
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
36(18)
Published: Jan. 21, 2024
The
development
of
metal-free
bifunctional
electrocatalysts
for
hydrogen
and
oxygen
evolution
reactions
(HER
OER)
is
significant
but
rarely
demonstrated.
Porous
organic
polymers
(POPs)
with
well-defined
electroactive
functionalities
show
superior
performance
in
reaction
(HER)
(OER).
Precise
control
the
active
sites'
local
environment
requires
careful
modulation
linkers
through
judicious
selection
building
units.
Here,
a
systematic
strategy
introduced
modulating
functionality
to
design
synthesize
series
thianthrene-based
sp
International Journal of Hydrogen Energy,
Journal Year:
2024,
Volume and Issue:
62, P. 272 - 306
Published: March 12, 2024
To
address
the
pressing
need
for
sustainable
energy
solutions,
hydrogen
has
emerged
as
a
"zero-emission"
source
with
vast
potential
in
diverse
sectors
like
manufacturing,
transportation,
and
electricity
generation.
However,
realization
of
economy
hinges
on
development
safe
stable
technologies
materials
storage
transport.
This
paper
presents
comprehensive
review
latest
advancements
systems,
particular
focus
porous
materials.
Notably,
carbon
derived
from
biomass
waste
have
garnered
attention
due
to
their
exceptional
qualities.
These
include
abundant
easily
accessible
raw
materials,
simplified
production
processes,
adjustable
characteristics,
cost-effectiveness,
low
mass
density,
high
specific
surface
area
porosity,
structural
diversity,
regeneration.
attributes
position
them
promising
candidates
further
exploration
devices,
particularly
achieving
H2
uptake
capacities.
The
feasibility
utilizing
both
plant-
animal-based
carbons
is
examined,
encompassing
activated
carbons,
heteroatom
doped
composites,
pivotal
components
devices.
synthesis
characterization
each
form,
along
respective
capacities,
are
highlighted.
While
material
exhibits
promise,
it
important
note
that
they
do
present
certain
technological
drawbacks.
Addressing
these
limitations
through
research
crucial
unlocking
full
future
applications
burgeoning
economy.
