Advanced Functional Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 12, 2024
Abstract
Freeze
casting
is
a
solidification
technique
utilized
in
the
fabrication
of
porous
materials.
However,
freeze
process
quite
complex,
and
significant
challenges
remain
precisely
controlling
pore
size
shape
structures.
This
study
aims
to
investigate
customization
multifunctional
electromagnetic
wave
(EMW)
absorbers
with
3D
structures
via
casting.
review
initially
presents
fundamental
principles
underlying
examines
correlation
between
internal
external
factors
during
preparation
porosity.
The
emerging
trends
constructing
novel
intricate
macroscopic
through
are
subsequently
outlined.
Furthermore,
this
focuses
on
composites
various
microstructures
low‐dimensional
building
blocks,
their
EMW
response
properties.
By
regulating
influencing
mechanisms
casting,
absorption
materials
exhibit
outstanding
advantages
such
as
property
manipulation,
controllable
structure,
high
porosity,
specific
surface
area,
lightweight,
flexibility.
These
features
broaden
applications
shielding,
mechanical
property,
radar
stealth,
thermal
insulation
fire
prevention,
flexible
sensors,
antifreeze
ability,
etc.
In
addition,
we
discuss
prospects
high‐performance
using
techniques.
Nano-Micro Letters,
Год журнала:
2024,
Номер
17(1)
Опубликована: Сен. 26, 2024
Abstract
Atomic-scale
doping
strategies
and
structure
design
play
pivotal
roles
in
tailoring
the
electronic
physicochemical
property
of
electromagnetic
wave
absorption
(EMWA)
materials.
However,
relationship
between
configuration
(EM)
loss
mechanism
has
remained
elusive.
Herein,
drawing
inspiration
from
DNA
transcription
process,
we
report
successful
synthesis
novel
situ
Mn/N
co-doped
helical
carbon
nanotubes
with
ultrabroad
EMWA
capability.
Theoretical
calculation
EM
simulation
confirm
that
orbital
coupling
spin
polarization
Mn–N
4
–C
configuration,
along
cross
generated
by
structure,
endow
converters
enhanced
loss.
As
a
result,
HMC-8
demonstrates
outstanding
performance,
achieving
minimum
reflection
−63.13
dB
at
an
ultralow
thickness
1.29
mm.
Through
precise
tuning
graphite
domain
size,
HMC-7
achieves
effective
bandwidth
(EAB)
6.08
GHz
2.02
mm
thickness.
Furthermore,
constructing
macroscale
gradient
metamaterials
enables
ultrabroadband
EAB
12.16
only
5.00
mm,
maximum
radar
section
reduction
value
reaching
36.4
m
2
.
This
innovative
approach
not
advances
understanding
metal–nonmetal
co-doping
but
also
realizes
broadband
EMWA,
thus
contributing
to
development
mechanisms
applications.
Nano-Micro Letters,
Год журнала:
2024,
Номер
16(1)
Опубликована: Апрель 15, 2024
Materials
exhibiting
high-performance
electromagnetic
wave
absorption
have
garnered
considerable
scientific
and
technological
attention,
yet
encounter
significant
challenges.
Developing
new
materials
innovative
structural
design
concepts
is
crucial
for
expanding
the
application
field
of
absorption.
Particularly,
hierarchical
structure
engineering
has
emerged
as
a
promising
approach
to
enhance
physical
chemical
properties
materials,
providing
immense
potential
creating
versatile
materials.
Herein,
an
exceptional
multi-dimensional
was
meticulously
devised,
unleashing
full
microwave
attenuation
capabilities
through
in
situ
growth,
self-reduction,
multi-heterogeneous
interface
integration.
The
features
three-dimensional
carbon
framework,
where
magnetic
nanoparticles
grow
on
skeleton,
necklace-like
structure.
Furthermore,
nanosheets
assemble
within
this
framework.
Enhanced
impedance
matching
achieved
by
precisely
adjusting
component
proportions,
intelligent
integration
diverse
interfaces
bolstered
dielectric
polarization.
obtain
Fe
Advanced Functional Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Окт. 29, 2024
Abstract
Thermochemical
conversion
is
a
highly
effective
method
for
upgrading
organic
solid
wastes
into
high‐value
materials,
contributing
to
carbon
neutrality
and
peak,
emission
goals.
It
also
serves
as
pathway
develop
energy‐efficient
electromagnetic
wave
absorbing
(EMWA)
materials.
In
this
study,
fish
skin
successfully
in
situ
nitrify
Prussian
Blue
Fe
3
N
under
external
thermal
driving
condition,
resulting
high
saturation
magnetization
utilized.
The
N@C
demonstrates
outstanding
EMWA
property,
achieving
minimum
reflection
loss
of
−71.3
dB.
Furthermore,
by
introducing
cellulose
nanofiber,
portion
the
iron
nitride
transformed
carbide,
C/Fe
N@C.
This
composite
exhibits
enhanced
properties
owing
wider
local
charge
redistribution
stronger
electronic
interactions,
an
absorption
bandwidth
(
EAB
)
6.64
GHz.
Electromagnetic
simulations
first‐principles
calculations
further
elucidate
mechanism,
maximum
reduction
value
radar‐cross
section
reached
37.34
dB·m
2
.
design
multilayer
gradient
metamaterials
demonstrated
ultra‐broadband
11.78
paper
presents
efficient
strategy
atomic‐level
biomass
waste
utilization
prepare
N,
provides
novel
insights
between
metal
nitrides
carbides,
offers
promising
direction
development
advanced
