Journal of nano research,
Год журнала:
2024,
Номер
82, С. 95 - 116
Опубликована: Апрель 8, 2024
Nafion
®
/silica
nanocomposite
membranes
were
prepared
by
impregnation
method
from
117
and
sol-gel
pre-synthesized
n-octadecyl-trimethoxy
silane
(C
18
TMS)
coated
silica
nanoparticles.
The
scanning
electron
microscope
(SEM)
of
pristine
particles
displayed
monodispersed
nanospheres
with
diameters
ranging
150-350
nm;
while
Brunauer-Emmett-Teller
(BET)
analysis
presented
760
m
2
/g
BET
surface
area,
a
micropore-mesopore
bimodal
distribution
micropore
systems
respective
pore
volume
at
14.6
Å
17.0
(2.01
x
10
-3
cm
3
/g.Å),
as
well
the
prolific
mesopores
centered
29.5
(5.64
-2
/g.Å).
Characterization
based
on
SEM,
Fourier
transform
infrared
spectroscopy
(FTIR),
thermogravimetric
(TGA),
x-ray
diffraction
(XRD),
tensile
stress
exhibited
varying
morphology
loadings,
structural
interaction
between
membrane
support
ion
exchanger,
thermal
stabilities
(up
to
330
°C),
crystalline
nature,
reasonable
mechanical
stability
membranes.
maximum
water
uptake
(44.8
%)
proton
conductivity
(1.14
x10
S/cm)
obtained
low
/SiO
(5%)
loaded
membrane.
While
both
composite
improved
reduction
in
methanol
permeability,
2.43x10
-07
/s
80
°C
was
high
(10%)
loading.
Improved
substantiate
exchange
capacity
(IEC)
1.81
meq.g
-1
when
compared
IEC
0.93
[pristine
]
1.46
[Nafion
(10%)].
increase
value
may
be
due
acid
functionalization
additional
sulfonic
groups
surrounded
hydrophilic
segments
nanosilica,
which
improves
properties
coupled
great
retention
capabilities
indicated
that
could
utilized
for
medium
temperature
fuel
cells.
Keywords:
Fuel
cells;
membrane;
SiO
nanofillers;
permeability;
Journal of the American Chemical Society,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 16, 2025
Hydrofluorocarbons
(HFCs)
are
anthropogenically
produced
greenhouse
gases
with
longer
atmospheric
lifetimes
and
higher
global
warming
potentials
than
those
of
carbon
dioxide.
General
strategies
to
abate
their
emissions
from
industrial
point
sources,
such
as
via
adsorptive
capture,
remain
scarce.
Herein,
we
uncover
the
key
structure–property
relationships
that
lead
strong
binding
HFCs
fluoroform
(CHF3)
difluoromethane
(CH2F2)
in
metal–organic
frameworks
(MOFs)
under
low
pressures
relevant
flue
gas
scrubbing.
Extensive
sorption
computational
studies
support
Zr-based
microporous
framework
MOF-801-Br
or
HHU-2-Br
(HHU
=
Heinrich-Heine-University
Düsseldorf)
strongly
binds
due
its
synergistic
combination
Zr-OH
sites
on
nodes
bromine
linkers.
As
such,
demonstrates
a
record-setting
performance
for
separating
CHF3
N2
dilute
conditions.
Our
work
highlights
multiple
hydrogen-bonding
MOFs
represents
generalizable
strategy
HFC
enabling
selective
removal
waste
streams.
Desalination,
Год журнала:
2024,
Номер
574, С. 117277 - 117277
Опубликована: Янв. 3, 2024
The
review
concludes
with
a
broad
spectrum
of
practical
applications
concerted
PVDF-CNM
membrane
materials
dedicated
for
liquid
and
gas
separation,
significant
focus
on
the
desalination
process.
research
is
carried
out
in
diverse
science
fields,
merging
chemistry
engineering
toward
frequently
multimodal
functionalities.
Hence,
there
high
demand
comprehensive
these
cutting-edge-materials
from
across
fundamental
sciences
technologies.
main
goals
work
are
linking
structure
PVDF
(phases)
CNMs
(carbon
atom
hybridization)
physico-chemical
properties
PVDF-CNMs
materials.
Moreover,
attention
was
paid
simplicity
generation
having
huge
potential
tuning
various
features
obtained
(e.g.,
hydrophilicity,
mechanical
properties,
catalytic
activity,
bioactivity).
Additionally,
new
directions
exploration
have
been
indicated.
Abstract
Fluorine‐free
organic
framework
polyelectrolyte
membranes
showing
near
frictionless
ionic
conductivities
are
gaining
cognitive
insights.
However,
the
co‐precipitation
of
COFs
in
often
brings
trade‐offs
to
commission
long‐life
electrochemical
energy
storage
solutions.
Herein,
a
durable
and
ionically
miscible
dual‐ion
exchange
membrane
based
on
triazine
(TOF)
is
designed
for
alkaline
redox
flow
batteries
(RFB).
Bearing
dual
ion‐exchange
architectures,
all‐hydrocarbon
TOF‐based
PEMs
(
s
TOF's)
surpass
fluorinated
Nafion
terms
efficiency
(>80%),
density,
peak
power
densities.
The
fabricated
TOF's
evidenced
highest
net
>2.1
meq
g
−1
which
encourages
electrolyte
utilization
with
≈100%
offers
excellent
capacities.
Moreover,
>97%
efficiencies
preserved,
rate
capability
studies
illustrate
that,
TOF‐5,
RFB
can
operate
at
reduced
overpotentials
(η
≤200
mV)
uplift
life.
supports
successful
demonstrations
higher
redoxolyte
concentrations
thereby
multiplying
afterlife
performance
TOF‐5
revealed
equivalent
fresh
Nafion‐117
surpassed
bearing
>50%
capacity
after
≈3000
continuous
cycles.
With
cell
delivered
(P
max
)
2.3
W
≈60%
than
that
=
1.45
W).
Frontiers in Materials,
Год журнала:
2025,
Номер
12
Опубликована: Фев. 14, 2025
The
white
weathering
layer
materials
that
can
effectively
block
the
entire
solar
light
band
is
of
great
importance
for
improving
service
life,
safety,
and
reliability
materials.
In
this
work,
CsxWO
3
@PDA
was
prepared
by
in
situ
polymerization
to
achieve
high
absorption
full
spectral
range
increase
compatibility
between
particles
polyvinylidene
fluoride
(PVDF).
PVDF
composite
films
with
different
particle
contents
were
through
compounding
titanium
dioxide
(TiO
2
)
@PDA.
characterized
FT-IR,
field
emission
scanning
electron
microscopy,
universal
material
testing
machine,
whiteness
meter,
ultraviolet
visible
spectroscopy.
results
showed
CsPVDF
TiO
exhibited
a
level
higher
than
74,
transmittance
less
5%
wavelength
200–2500
nm,
close
zero
below
1750
demonstrating
excellent
shielding
effect.
xenon
lamp
aging
test
also
confirmed
had
weather
resistance
after
500
h.
At
same
time,
adding
certain
amount
could
improve
tensile
strength
PVDF.
Per-
or
polyfluoroalkyl
substances
(PFASs)
are
man-made
compounds
involved
in
compositions
of
many
industrial
processes
and
consumer
products.
They
categorized
into
two
main
families
based
on
their
molar
mass:
though
low
mass
products
(<1000
Da)
toxic,
mobile,
bioaccumulable,
cross
the
human
membranes,
others
much
higher
masses,
e.g.,
fluorinated
macromolecules
especially
fluoropolymers,
safe
reliable,
do
not
face
such
concerns,
membranes
(hence,
they
regarded
as
Polymers
Low
Concern),
applications
including
medical
high-value-added
materials
devices.
Because
former
family
has
led
to
a
severe
global
contamination,
recent
regulating
agencies
Europe
(REACH)
USA
(EPA)
have
aimed
at
restricting
fluorochemicals.
Recently,
consultations
from
affected
organisms
industries
more
than
5600
answers
comments.
This
review
supplies
an
update
overall
situation
PFASs,
limitations,
regulations,
end
life,
degradations,
possible
alternatives.
