Proceedings of the World Congress on Recent Advances in Nanotechnology,
Год журнала:
2024,
Номер
unknown
Опубликована: Апрель 1, 2024
The
prompt
development
of
carbon-based
nanostructured
materials
has
received
a
wide-spread
interest
due
to
their
novel
physico-chemical
properties
and
applications
[1].Modification
2D
graphene
with
heteroatom
substitution
is
one
the
efficient
approaches
tuning
its
electronic
chemical
properties.Nitrogen-doped
stimulated
lots
in
manipulating
for
diverse
research
areas
[2].Experimental
theoretical
studies
revealed
that
doping
configuration
nitrogen
dopants
can
significantly
influence
material
[3],
[4],
[5],
[6].In
this
study,
finite-sized
model,
C186H36,
was
considered
investigate
double
within
six-membered
rings
graphene.Graphitic
atoms
were
employed
efficiency
fine-tuning
performance
oxygen
reduction
reaction
(ORR)
activity
opening
band
gap.Three
possibilities
dinitrogen
are
1,2-,
1,3-and
1,4-substitutions,
which
may
consider
correspondingly
as
ortho-,
meta-,
para-like
substitutions.This
comprehensive
computational
study
presents
results
positional
preference
multiple
non-equivalent
rings.Our
aim
above-mentioned
three
different
reveal
any
selectivity
two
rings.All
structures
fully
optimized
using
density
functional
theory
(DFT)
at
B3LYP/6-31G(d)
level.The
energy
gap
between
highest
occupied
molecular
orbital
(HOMO)
lowest
unoccupied
(LUMO)
values
all
isomers
calculated
TPSSh/6-31G(d)
level
geometries.Relative
stabilities
these
generally
follow
trend:
1,4->
1,3->
1,2substitution.Interestingly,
location
ring
plays
role
determining
relative
dopants.Our
predicts
most
stable
have
doped
close
zigzag
edge.However,
armchair
edge
provides
high
energy.The
effect
on
HOMO
LUMO
energies
HOMO-LUMO
gaps
analyzed.Our
indicates
be
opened
by
controlled
model.
Molecules,
Год журнала:
2024,
Номер
29(9), С. 2002 - 2002
Опубликована: Апрель 26, 2024
Carbon
quantum
dots
are
a
novel
form
of
carbon
material.
They
offer
numerous
benefits
including
particle
size
adjustability,
light
resistance,
ease
functionalization,
low
toxicity,
excellent
biocompatibility,
and
high-water
solubility,
as
well
their
easy
accessibility
raw
materials.
have
been
widely
used
in
various
fields.
The
preparation
methods
employed
predominantly
top-down
such
arc
discharge,
laser
ablation,
electrochemical
chemical
oxidation,
bottom-up
templates,
microwave,
hydrothermal
techniques.
This
article
provides
an
overview
the
properties,
methods,
materials
for
preparation,
heteroatom
doping
dots,
it
summarizes
applications
related
fields,
optoelectronics,
bioimaging,
drug
delivery,
cancer
therapy,
sensors,
environmental
remediation.
Finally,
currently
encountered
issues
presented.
latest
research
progress
synthesis
application,
challenges
outlined
this
review,
can
help
encourage
future
on
dots.
International Journal of Biomaterials,
Год журнала:
2025,
Номер
2025(1)
Опубликована: Янв. 1, 2025
In
recent
years,
green
synthesis
methods
for
producing
nanomaterials
have
gained
significant
interest
due
to
their
environmentally
friendly
nature
and
wide‐ranging
applications.
The
present
study
addresses
a
novel
of
graphene
quantum
dots
(GQDs)
using
leaves
Withania
somnifera.
size,
morphology,
stability
the
green‐synthesized
GQDs
were
characterized
TEM,
UV‐Visible
spectroscopy,
Fluorescence
spectrophotometer,
XRD,
DLS.
bio‐functional
properties
investigated,
with
focus
on
antidiabetic
antioxidant
capabilities.
Their
activity
was
assessed
by
examining
ability
inhibit
α‐amylase
α‐glucosidase
enzymes,
which
play
crucial
role
in
glucose
metabolism.
Additionally,
evaluated
DPPH●
scavenging
assays,
highlighting
effectiveness
neutralizing
free
radicals.
findings
revealed
that
synthesized
outperformed
original
leaf
extract
both
enzyme
inhibition.
exhibited
higher
IC
50
values
inhibiting
DPPH
(78.508
±
5.71),
(161.909
6.188),
(133.345
7.328)
compared
GQDs,
showed
lower
72.74
5.9,
137.966
6.95,
122.084
5.478,
respectively.
indicate
somnifera
derived
hold
potential
medical
applications,
warranting
further
investigation
into
therapeutic
efficacy.
This
offers
comprehensive
analysis
fundamental
biological
addressing
dual
challenges
activity.
Solids,
Год журнала:
2022,
Номер
3(3), С. 508 - 548
Опубликована: Сен. 16, 2022
This
publication
summarises
the
current
state
of
knowledge
and
technology
on
possibilities
limitations
using
mineral
synthetic
fillers
in
field
3D
printing
thermoplastics.
FDM
can
be
perceived
as
a
miniaturised
variation
conventional
extrusion
processing
(a
microextrusion
process).
However,
scaling
process
down
has
an
undoubtful
drawback
significantly
reducing
extrudate
diameter
(often
by
factor
≈20–30).
Therefore,
results
produced
under
cannot
simply
translated
to
processes
run
with
application
technology.
With
that
mind,
discussing
latest
findings
composite
materials
preparation
was
necessary.
Advanced Functional Materials,
Год журнала:
2024,
Номер
34(38)
Опубликована: Июнь 18, 2024
Abstract
In
the
antimicrobial
resistance
era,
carbon‐based
nanomaterials
(CBNs)
such
as
fullerenes,
carbon
dots,
graphene,
and
their
derivatives
are
promising
therapeutic
tools
in
combating
viral
diseases.
This
review
shows
that
these
materials
have
broad‐spectrum
antiviral
activity
against
33
viruses
belonging
to
different
Baltimore
groups.
CBNs
also
exhibit
bacteria
fungi
possess
a
low
risk
of
selecting
for
resistance,
since
primary
mode
action
involves
physically
damaging
microbes.
offer
additional
properties,
including
enhanced
effectiveness
under
diverse
types
irradiation
facilitating
immune
responses.
Their
potential
agents
is
still
its
infancy
future
research
should
focus
on
toxicity,
mechanisms,
pharmacokinetics,
bioavailability.
They
preventing
transmission
diseases
use
face
masks,
shields,
hospital
airport
surfaces,
elevators,
among
others.
It
anticipated
will
play
an
increasingly
significant
role
fight
infectious
Materials,
Год журнала:
2025,
Номер
18(5), С. 1176 - 1176
Опубликована: Март 6, 2025
The
addition
of
carbon
nanotubes
(CNTs)
to
cement
matrix
brings
multiple
beneficial
effects
ranging
from
improving
mechanical
and
physical
properties
the
creation
smart
materials.
When
subjected
an
erosive
environment
or
as
end-of-life
waste,
mortars
with
CNT
might
get
released
into
come
in
contact
surface
waters.
assessment
environmental
impact
reinforced
is
important
factor
concerning
their
sustainability,
it
has
not
yet
been
addressed
literature.
presented
paper
aims
assess
water
toxicity
various
dosages
0.05
wt.%,
0.1
0.2
wt.%
nanotube.
effect
quality
dispersion
CNTs
was
also
considered
through
two
sonication
times
suspension:
20
min
60
min.
Tests
using
indicator
organisms,
Aliivibrio
fischeri,
Daphnia
magna,
Lemna
minor,
were
conducted
on
shredded
non-shredded
mortars.
results
reveal
no
low
for
all
tested
under
assumed
framework
assessment.
samples
containing
comparable
those
without
CNTs,
indicating
that
incorporating
greater
than
conventional
cement-based
rather
connected
washing
away
hydration
products
more
presence
nanotubes.
