Polymer Composites,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Nov. 7, 2024
Abstract
The
strategic
alignment
of
nanoplatelets
within
polymer
matrices
is
pivotal
for
the
development
nanocomposites
with
superior
gas
barrier
characteristics.
In
this
work,
effect
lamellar
particles
orientation
in
permeation
was
demonstrated.
magnetic
α‐Al
2
O
3
(Al
@PDA‐Fe
4
)
first
prepared
by
situ
growth
Fe
nanoparticles
immobilized
on
polydopamine
(PDA)‐modified
Al
surface.
Subsequently
brominated
butyl
rubber
(BIIR)
achieved
modulating
applied
field
direction.
Results
show
that
PDA,
as
role
surface
adhesive,
not
only
anchored
substrate
but
also
bound
ferric
ions
further
formation
,
which
ensured
physico‐chemical
stability
.
Comparison
hydrogen
performance
composites
in‐plan,
middle‐of
plane
and
out‐of
demonstrated
orientation.
/BIIR
composite
in‐plane
had
best
property
a
50%
reduction
permeability
coefficient
compared
to
neat
BIIR,
underscoring
critical
particle
enhancing
properties
nanocomposites.
Highlights
structural
enhanced
(PDA).
alignment,
were
field.
studied.
possesses
property.
Advanced Sustainable Systems,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 9, 2025
Abstract
The
selective
oxidation
of
glycerol
to
dihydroxyacetone
(DHA)
represents
a
critical
method
for
efficiently
utilizing
glycerol,
primary
byproduct
biodiesel
production.
However,
the
challenge
balancing
catalyst
activity
and
recycling
stability
significantly
limits
practical
application
this
process.
Herein,
conversion
performance
is
effectively
modulated
by
controlling
nanostructure
support
in
Au‐supported
catalysts.
Zinc
oxide
carriers
with
morphologies
nanorods
(NRs),
nanoflowers
(NFs),
nanoparticles
(NPs)
are
successfully
prepared
loaded
Au
obtain
series
Au/ZnO‐Z
Among
them,
composed
flower‐shaped
zinc
nanostructures
NPs
(Au/ZnO‐NF)
exhibits
optimal
performance,
92.9%
DHA
selectivity
69.5%.
Notably,
Au/ZnO‐NF
demonstrates
exceptional
cycling
surpassing
most
currently
reported
catalysts,
maintaining
75.2%
75.1%
even
after
five
cycles.
Comprehensive
characterization
experimental
analysis
demonstrat
that
catalysts
exhibit
low
reduction
temperatures,
smallest
nanoparticle
size,
excellent
crystallinity,
enhance
adsorption
O
2
polyols
at
secondary
hydroxyl
moiety.
ACS Catalysis,
Journal Year:
2025,
Volume and Issue:
unknown, P. 5847 - 5857
Published: March 26, 2025
Aqueous
phase
reforming
of
methanol
(APRM)
offers
a
method
for
releasing
H2
from
the
liquid
phase,
by
which
can
be
stored
in
safely.
It
is
an
efficient
way
to
design
high-performance
catalysts
controlling
hydroxyl
(OH)
groups,
but
its
mechanism
affecting
APRM
still
unclear.
Herein,
we
loaded
Pt
on
three
types
Al2O3
(nanopolyhedron,
nanosheet,
and
nanorod
Al2O3)
with
different
OH
contents
types.
Among
them,
Pt/nanorod
exhibited
highest
production
rate
20.4
μmol
g–1
s–1
96.6%
selectivity
at
low
temperature
190
°C.
This
was
attributed
roles
groups
modulating
states.
On
nanopolyhedron,
Al2O3,
bonding
O
atoms
became
more
favorable
as
dehydroxylation
happened.
In
particular,
process
generated
high
density
five-coordinated
Al
(AlV)
sites,
facilitating
dispersion
anchoring
particles.
Moreover,
special
(hydrogen
bond
donor)
promoted
particle
reduction
via
movement
electrons.
Ultimately,
results
demonstrated
influence
active
metals,
offering
perspectives
designing
through
control.
