ACS Omega,
Journal Year:
2024,
Volume and Issue:
10(1), P. 1012 - 1018
Published: Dec. 27, 2024
Passive
radiative
cooling
technology
serves
as
an
energy-free
alternative
to
traditional
systems.
Porous
polymer
structures
are
frequently
employed
for
by
leveraging
the
refractive
index
mismatch
between
and
pores,
enabling
scattering
of
incoming
sunlight.
Recently,
water-soluble
readily
available
Sodium
chloride
(NaCl)
particles
have
been
utilized
sacrificial
templates
sustainable
pore
creation.
Nevertheless,
optimizing
NaCl
particle
size,
thus
size
enhance
capabilities
remains
a
challenge.
Here,
we
report
simple,
scalable,
approach
creating
optimized
porous
polydimethylsiloxane
(PDMS)
film.
This
utilizes
ultrafine
powders
templates,
which
were
synthesized
via
ultrasonic
precipitation
ensure
their
small
size.
The
distribution
centered
around
6–8
μm,
as-fabricated
PDMS
film
achieves
high
thermal
emissivity
0.95
within
atmospheric
window
(8–13
μm)
exhibits
reflectivity
visible
range
(0.4–0.78
μm).
Due
desired
dual-spectrum
properties,
superior
subambient
capacity
over
that
fabricated
with
typically
larger
under
strong
study
offers
scalable
practical
solution
management.
Advanced Functional Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 21, 2025
Abstract
The
rapid
development
of
global
urbanization
has
exacerbated
the
urban
heat
island
effect
and
electromagnetic
radiation
pollution.
However,
existing
fabrics
fail
to
provide
both
effective
personal
thermal
management
interference
(EMI)
shielding.
To
address
this
challenge,
an
asymmetric
gradient
porous
fabric
(AGPF)
is
developed
using
a
delayed
evaporation‐induced
phase
separation
strategy.
AGPF
consists
polystyrene‐block‐poly(ethylene‐ran‐butylene)‐block‐polystyrene
(SEBS)
transversely
oriented
liquid
metal
(LM)
networks
with
wrinkled
structures
at
bottom.
Due
complete
sedimentation
metal,
SEBS
maintains
excellent
solar
reflectivity
93.9%
atmospheric
window
infrared
emissivity
94.7%.
Upon
activation
by
pre‐stretching,
LM
imparts
high
electrical
conductivity
enhanced
stretchability
AGPF,
resulting
in
EMI
shielding
effectiveness
80.6
dB
heating
performance.
Outdoor
cooling
tests
further
confirmed
that
achieves
sub‐ambient
≈9.5
°C.
Moreover,
exhibits
dynamically
tunable
performance
across
strain
range
0%
200%,
adapting
complex
outdoor
environments.
design
provides
advanced
solution
protect
individuals
from
dual
threats
posed
effects
Radiative
cooling
is
an
excellent
strategy
for
mitigating
global
warming,
by
enhancing
heat
fluxes
away
from
the
Earth,
thus
balancing
Earth's
flow.
However,
randomly
particle-dispersed
radiative
materials,
particle
content
as
high
94–96
wt
%
or
60
vol
%,
far
exceeds
critical
pigment
percentage
(40–50%)
of
traditional
coatings,
preventing
its
large-scale
application.
Here,
inspired
deposition
under
gravity
in
solution,
we
demonstrate
auto-deposited
SiO2
composite
coating
(ADRC)
which
reduces
amounts
particles
required
and
lowers
costs.
This
density
gradient
structure
enhances
local
volume
fraction
particles,
thereby
exhibits
solar
reflectance
(93%)
infrared
emissivity
(89%),
contributing
to
a
daytime
subambient
temperature
drop
12
°C.
The
energy-saving
potential
buildings
China
utilizing
ADRC
roofs
ranges
6.42
13.52%.
low-cost
scalable
cooler
expected
reduce
energy
consumption
carbon
emissions,
addressing
warming
issues.
Materials Horizons,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 1, 2025
A
leaf-inspired
double-layer
membrane
was
designed,
exhibiting
99.3%
solar
reflectivity
and
∼95%
mid-infrared
emissivity.
It
remained
stable
under
7000
MJ
m
−2
ultraviolet
radiation,
presenting
a
new
strategy
for
passive
radiative
cooling.
Small,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 5, 2025
Abstract
One‐dimensional
photonic
crystals
(1D
PCs)
emerged
as
superb
sensing
platforms
due
to
their
high
sensitivity
environmental
changes.
However,
effectively
translating
the
microscopic
interactions
between
covalent
organic
frameworks
(COFs)
and
analytes
into
macroscopic
optical
responses
via
1D
PCs
for
intuitive
detection
presents
a
significant
challenge.
Here,
we
propose
stepwise‐induced
synthesis
strategy
that
first
time
achieves
size‐controlled
of
uniform
nanoscale
COFs
(60–80
nm),
leading
high‐quality
COF
layer.
This
advancement
enables
COF‐based
exhibit
diverse
color
variations
controllable
saturation.
Notably,
excellent
compatibility
layer
with
inorganic
oxides,
polymers,
metal‐organic
(MOFs)
results
in
these
exhibiting
bright
colors.
Crucially,
introducing
mesoporous
materials
achieve
deep
integration
adsorption
recognition
functions
volatile
compounds
(VOCs).
The
fabricated
COF/MOF
PC
allows
differentiation
12
VOCs
visually
detects
at
different
concentrations
(0–80
g
m
−
3
)
through
changes,
response
under
1
s.
In
particular,
can
be
transferred
flexible
substrates
while
retaining
VOC
visual
sensing.
These
attributes
highlight
potential
real‐time
monitoring
industrial
environments.
ACS Nano,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 6, 2025
Passive
radiative
cooling
technology
provides
a
sustainable
thermal
management
strategy
for
outdoor
workers
under
extremely
hot
environments.
However,
daytime
textiles
typically
appear
white
or
mirror-like
due
to
the
near-complete
reflection
of
sunlight,
which
poses
significant
limitation
applications
where
visual
aesthetics
are
important.
Herein,
we
designed
colored
photoluminescent
(CPRC)
metafabrics,
woven
from
carbon-dot-based
coaxial
porous
fibers,
achieve
effective
without
sacrificing
color
aesthetics.
The
fibers
with
nanostructured
light-scattering
shell
layer
and
an
enhanced
mid-infrared
emission
core
layer,
together
improve
sunlight
human
infrared
radiation.
Leveraging
properties
carbon
dots,
CPRC
metafabrics
enable
selective
adsorption
visible
light
display
vivid
colors
while
re-emitting
photons
reduce
solar
heat
generation,
achieving
high
light-to-photon
conversion
efficiency
48.3%.
Consequently,
metafabric
its
colorful
appearance
demonstrates
maximum
net
power
69.2
W
m-2,
offering
average
temperatures
that
3.7
3.6
°C
lower
than
those
commercial
wool
dye-based
fabric,
respectively.
Furthermore,
possess
self-sensing
health
monitoring
capability
long-time
durability,
ensuring
both
safety
comfort
workers.
This
work
effectively
addresses
long-standing
problem
integrating
textiles,
facilitating
development
application
next-generation
wearable
energy-saving
textiles.
