Angewandte Chemie,
Journal Year:
2024,
Volume and Issue:
136(44)
Published: July 22, 2024
Abstract
Marine
biofouling,
which
is
one
of
the
technical
challenges
hindering
growth
marine
economy,
has
been
controlled
using
cuprous
oxide
(Cu
2
O)
nanoparticles
due
to
exceptional
antifouling
properties
Cu(I)
ions.
However,
Cu
O
have
encountered
bottlenecks
explosive
releases
+
ions,
high
toxicity
at
elevated
doses,
and
long‐term
instability.
Here,
we
present
a
novel
method
called
Redox
Concomitant
Formation
(RCF)
for
fabricating
hierarchical
metal–organic
framework
polypyrrole
(Cu(I)−MOF/PPy)
composite.
This
enables
in
situ
phase
transition
via
successive
redox
reactions
that
change
chemical
valence
state
coordination
mode
Cu(II)−MOF,
resulting
new
structure
Cu(I)−MOF
while
creating
PPy
layer
surrounded
by
structure.
Owing
steady
release
ions
from
sites
photothermal
PPy,
Cu(I)−MOF/PPy
exhibits
superior
broad‐spectrum
resistance
bacteria,
algae,
surface‐adhered
biofilms
complex
biological
environments,
as
well
stability,
100
%
eradication
efficiency
under
solar‐driven
heating.
Mechanistic
insights
into
structural
formation
RCF
are
provided
detail,
enabling
fabrication
MOFs
with
desired
composition
wide
range
potential
applications.
Materials,
Journal Year:
2025,
Volume and Issue:
18(2), P. 439 - 439
Published: Jan. 18, 2025
Nanoparticles
(NPs)
are
excellent
antibacterial
agents
due
to
their
ability
interact
with
microorganisms
at
the
cellular
level.
However,
antimicrobial
capacity
can
be
limited
by
tendency
agglomerate.
Functionalizing
NPs
suitable
ligands
improves
stability
and
dispersion
in
different
media
enhances
activity.
The
present
work
studied
functionalization
of
SiO2
using
sonochemical
method
Influence
organic
on
activity
(AA).
were
citric
acid
(CA)
monoethanolamine
(MEA).
X-ray
diffraction
(XRD)
photoelectron
spectroscopy
(XPS)
results
confirmed
amorphous
structure
functionalization.
Thermogravimetric
analysis
(TGA)
showed
that
MEA
(SiO2-MEA
NPs)
is
more
favored
compared
AC
(SiO2-CA
NPs),
ligand
content
was
34.42%
28.0%,
respectively.
Fourier-transform
infrared
(FTIR)
RAMAN
through
presence
carboxyl
amino
groups.
Scanning
electron
microscopy
(SEM),
transmission
(TEM),
zeta
potential
helped
improve
prevent
agglomeration.
Furthermore,
against
Staphylococcus
aureus
Escherichia
coli
provided
a
significant
improvement
(AA)
NPs,
where
SiO2-CA
highest
activity,
99.99%
inhibition
percentage
concentrations
200
ppm
both
E.
S.
strains.
AA
maintained
high
1200
ppm,
which
essential
applications
requiring
percentages
biocidal
such
as
marine
coatings.
