The Journal of Physical Chemistry C,
Journal Year:
2024,
Volume and Issue:
128(42), P. 17894 - 17904
Published: Oct. 15, 2024
The
oxidation
of
NO
molecules
on
epoxy-functionalized
highly
oriented
pyrolytic
graphite,
thermalized
at
300
K,
was
studied
by
means
ab
initio
molecular
dynamics
(AIMD)
calculations.
Four
collision
energies
and
two
different
orientations
were
analyzed
where
the
reaction,
adsorption,
scattering
probabilities
computed.
Our
results
reveal
that
NO$_2$
formation
can
occur
even
lowest
energy
investigated
(0.025
eV),
approximately
equivalent
to
room
temperature
(300
K),
which
agrees
qualitatively
with
experimental
results.
This
underscores
influence
process,
since
this
barrier
previously
theoretically
estimated
be
about
0.1
eV
0
is
four
times
higher
than
our
energy.
Additionally,
we
obtained
angular
distributions
products
under
selected
simulation
conditions.
Scattered
show
low
specular
reflection,
lose
half
their
initial
translational
energy,
remain
vibrationally
cold
minimal
rotational
excitation.
Furthermore,
a
statistical
analysis
all
reactive
trajectories,
focusing
configurations
specific
reaction
moments,
elucidated
structural
requirements
for
dynamic
Finally,
study
demonstrates
potential
oxygen-doped
carbon
surfaces
conversion
NO$_2$.
Aerosol Research,
Journal Year:
2025,
Volume and Issue:
3(1), P. 1 - 13
Published: Jan. 13, 2025
Abstract.
Particle
light
absorption
enhancement,
also
known
as
the
lensing
effect,
is
a
complex
phenomenon
where
particles
undergo
optical
transformation
they
age.
This
process
influenced
by
several
factors,
including
particle
size.
To
investigate
this
study
introduces
and
validates
novel
method
for
size-resolved
measurements
using
nigrosin
model
system.
The
combines
three-wavelength
cantilever-enhanced
photoacoustic
spectrometer
(CEPAS)
with
differential
mobility
analyser
(DMA)
to
achieve
particle-size-resolved
measurements.
Nigrosin,
well-characterised,
spherically
shaped,
water-soluble
material,
was
selected
demonstrate
feasibility
precision
of
approach.
system
showed
strong
agreement
(R2>0.94)
Mie-modelled
absorption,
confirming
its
reliability.
While
broader
motivation
work
lies
in
advancing
techniques
studying
ageing,
coating,
enhancement
black
carbon
other
atmospheric
aerosols,
present
serves
foundational
step
validating
methodology
controlled
simplified
context.
Future
studies
will
expand
application
systems,
coated
aggregated
particles,
explore
phenomena
such
enhancement.
Molecules,
Journal Year:
2025,
Volume and Issue:
30(2), P. 358 - 358
Published: Jan. 17, 2025
The
removal
of
soot
particles
via
high-performance
catalysts
is
a
critical
area
research
due
to
the
growing
concern
regarding
air
pollution.
Among
various
potential
suitable
for
oxidation,
cerium
oxide-based
materials
have
shown
considerable
promise.
In
this
study,
CeO2
samples
obtained
using
range
preparation
methods
(including
hydrothermal
synthesis
(HT),
sonochemical
(SC),
and
hard
template
(TS))
were
tested
in
combustion.
They
compared
commercially
available
material
(COM).
All
synthesized
ceria
thoroughly
characterized
XRD,
RS,
UV/Vis-DR,
XPS,
H2-TPR,
SEM,
TEM
techniques.
As
confirmed
current
every
sample
can
be
used
as
an
effective
oxidation
catalyst,
with
temperature
50%
conversion
not
exceeding
400
°C
tight
contact
mode.
A
strong
correlation
was
observed
between
catalysts'
Ce3+
concentration
activity,
higher
levels
leading
improved
performance.
These
findings
underscore
importance
optimizing
ceria-based
environmental
applications.
Wildfire
particulate
matter
from
Canadian
forest
fires
significantly
impacted
the
air
quality
in
northeastern
United
States
during
summer
of
2023.
Here,
we
used
real-time
and
time-integrated
instrumentation
to
characterize
physicochemical
properties
radiative
effects
wildfire
reaching
metropolitan
areas
New
Jersey/
York
this
extreme
incident.
The
forcing
-352.4
W/m2
derived
here
based
on
measured
optical
explains,
some
extent,
ground
level
temperature
reduction
about
3
°C
observed
City
Such
negative
densely
populated
megacities
may
limit
natural
ventilation,
increase
residence
time
background
pollutants,
exacerbating
public
health
risks.
This
study
highlights
importance
their
potential
implications
for
climate,
health.
Atmosphere,
Journal Year:
2025,
Volume and Issue:
16(2), P. 187 - 187
Published: Feb. 6, 2025
Emissions
from
domestic
coal
burning
are
generally
recognized
as
the
cause
of
lung
cancer
epidemic
in
Xuanwei
City,
Yunnan
Province,
China.
To
examine
physicochemical
characteristics
airborne
particles
emitted
this
locally
sourced
coal,
PM2.5
samples
were
collected
Hutou
village
which
has
high
levels
cancer,
and
Xize
located
approximately
30
km
without
cases.
Transmission
Electron
Microscopy-Energy
Dispersive
X-ray
(TEM-EDX)
analysis
was
employed
to
study
physiochemical
features
chemistry
individual
particles.
Sulfur
silica
most
abundant
elements
found
both
two
villages.
Fewer
aerosol
compared
with
village.
Based
on
morphologies
chemical
compositions,
can
be
classified
into
five
types
including
composite
(38.6%);
organic,
soot,
tar
balls,
biologicals
(28.3%);
sulfate
(14.1%);
fly
ash
(9.8%);
minerals
(9.2%).
The
size
range
0.4–0.8
μm
while
that
is
0.7–0.8
μm.
Composite
common
all
ranges.
percentage
shows
peaks
small
(0.1–0.2
μm)
large
ranges
(2–2.3
an
even
distribution
Core-shell
typical
particles,
solid
‘core’
consisting
materials
such
or
mineral
grains,
shell
surface
layer
being
adhering
soluble
compound
sulfates
organics.
heterogeneous
reactions
acidic
liquid
layers
produce
core-shell
structures.
Typically,
equivalent
diameter
0.5–2.5
μm,
averaging
1.6
ratio
usually
between
0.4
0.8,
average
0.6.
Regardless
sizes
relatively
ratios
imply
a
less
aging
state,
suggests
recently
formed.
Once
coal-burning
inhaled
human
deep
lung,
they
damage
cells
harm
health.
