Journal of Polymer Science,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Nov. 28, 2024
ABSTRACT
Ferrocenyl‐containing
Fe(II)‐bipyridinedicarboxamide
polysiloxane
complexes
with
two
redox
metal
centers
were
obtained
by
anionic
ring‐opening
polymerization,
polycondensation,
and
complexation
reactions
utilizing
various
Fe
II
:Bipy
molar
ratios
of
1:(3–12).
The
polymer
ligand
was
characterized
liquid‐state
NMR,
FTIR,
gel
permeation
chromatography
(
M
n
=
8800).
structure
the
polymer‐metal
(PMCs),
that
is,
presence
ferrocenyl
groups
[Fe
(Bipy)
3
]
coordination
cross‐links
–N
Bipy
bond
formation,
confirmed
solid‐state
UV–vis,
EDX.
PMCs
exhibit
multiredox
activity
showing
three
waves
at
E
1/2
≈
−1.3,
0.2,
1.0
V
related
to
Fc/Fc
+
couple,
[Fe(Bipy)
2
/[Fe
2+
,
/[Fe(Bipy)
3+
transformations.
possess
electrochromic
properties
resulting
from
reduction–oxidation
(Fc/Fc
)
fragments
leading
changes
in
intensity
bands
628,
542,
380
nm
UV–vis
spectra
(coloring
efficiency
reaches
13.4
cm
·C
−1
).
are
flexible,
stretchable,
mechanically
strong
silicone
materials
elongation
break,
tensile
strength,
Young's
modulus
reaching
110%,
3.5
MPa,
21.8
respectively,
self‐healing
ability
100°C.
described
expand
applications
as
engineering
for
fabrication
(opto)electronic
devices
protective
coatings
a
long
service
life
compared
previously
reported
polymers.
Small,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 20, 2025
Abstract
Electromagnetic
pollution
protection
and
military
stealth
technologies
underscore
the
urgent
need
to
develop
efficient
electromagnetic
wave‐absorbing
materials
(EWAMs).
Traditional
EWAMs
suffer
from
single
absorption
loss
mechanisms,
poor
impedance
matching,
weak
reflection
loss.
To
date,
combining
dielectric
with
magnetic
in
have
proven
be
an
effective
approach
enhancing
performance.
The
structural
design
of
composites
plays
a
pivotal
role
improving
matching
attenuation
waves.
It
is
widely
regarded
as
one
principal
methods
for
fine‐tuning
parameters
response
mechanisms.
Among
these,
carbon
become
research
hotspot
due
their
magnetoelectric
synergistic
effects
versatile
microstructure
design.
Herein,
principles
wave
terms
both
mechanism
are
outlined.
progress
on
core–shell,
skeleton,
hollow
structure
carbon/magnetic
composite
summarized.
synthesis
methods,
properties,
mechanisms
these
structures
described
detail.
Finally,
limitations
discussed,
possible
solutions
proposed,
future
development
directions
envisioned.
Small,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Oct. 31, 2024
Abstract
The
proliferation
of
electronic
devices
drives
the
adoption
electromagnetic
wave
(EMW)
absorbing
materials
to
mitigate
pollution.
Metal‐organic
frameworks
(MOFs)
reveal
great
potential
in
EMW
absorption
field
due
their
unique
pore
structure
and
outstanding
physicochemical
properties.
However,
single
MOFs
are
difficult
achieve
both
efficient
wide
frequency
coverage
owing
limited
properties
structural
composition.
Herein,
a
sandwich‐like
ternary
MOF
composite
is
successfully
synthesized
through
hierarchical
assembly
strategy.
Following
high‐temperature
treatment,
converted
into
nitrogen‐doped
porous
carbon
with
magnetic
metals,
non‐magnetic
metal
oxides,
nanotubes
on
surface
(labeled
as
TiO
2
/C@Co/N/C@CNT).
sandwich
resulting
derivatives
provides
multi‐level
microstructure
multi‐component
synergistic
effects,
significantly
enhancing
capabilities
broadening
effective
bandwidth
(EAB).
At
1.8
mm
matching
thicknesses,
material
achieves
reflection
loss
−56.3
dB
6.6
GHz
EAB.
Adjusting
thicknesses
2.3
3.1
extends
EAB
6.1–18
GHz,
peaks
−47.6
−47.1
dB.
This
work
offers
novel
guidance
for
constructing
advanced
MOF‐derived
ultra‐broadband
strong
meticulous
design
multiple
components
combination.
Journal of Materials Chemistry A,
Journal Year:
2024,
Volume and Issue:
12(37), P. 25322 - 25333
Published: Jan. 1, 2024
The
incorporation
of
wave-transparent
SiO
2
layer
expands
the
incidence
area
for
EMWs,
which
significantly
enhances
electromagnetic
wave
absorption
performance
FeSiAl@SiO
@MoS
.
