ACS Omega,
Journal Year:
2024,
Volume and Issue:
9(50), P. 49494 - 49502
Published: Dec. 4, 2024
The
cooling
power
of
radiative
(RC)
coatings
depends
not
only
on
the
properties
coating
but
also
environmental
variables.
In
tropical
environments,
performance
RC
deteriorates
due
to
high
humidity
and
solar
radiation.
Previous
studies
focused
developing
solar-reflective
achieve
subambient
in
environments.
However,
these
have
demonstrated
ability
be
used
at
a
large
scale,
mainly
their
cost
or
less
durability.
Herein,
we
test
an
paint
composed
TiO2
polydimethylsiloxane
(PDMS)
three
different
cities
with
moderate
levels.
Though
significant
reduction
internal
temperature
paint-coated
aluminum
(Al)
box
is
observed,
compared
uncoated
Al
box,
both
achieved.
A
comprehensive
analysis
conducted
clarify
reasons
behind
inability
attain
cooling.
Personal
protective
clothing
is
essential
in
biochemical
threat
environments,
however
balancing
protection,
thermal
comfort,
and
breathability
remains
a
significant
challenge.
This
work
introduces
novel,
skin-friendly
ultrabreathable
radiative
cooling
membrane
(Ub-RCPM),
which
developed
via
one-step
evaporation-induced
pore
formation
process.
The
sequential
evaporation
of
solvent
nonsolvent
during
the
process
endows
an
open-cell
hierarchical
structure.
By
adjusting
size,
Ub-RCPM
simultaneously
offers
high
moisture
permeability,
passive
cooling.
structure
demonstrates
sunlight
reflectivity
94.79%
infrared
emissivity
94.53%
through
atmospheric
window,
enables
efficient
Its
water
vapor
transmission
rate
8904.59
g
m-2
day-1,
3.5
times
higher
than
that
commercial
protection
clothing.
Additionally,
submicron
pores
provide
filtration
efficiency
99.1%
for
75
nm
aerosols.
combination
ultrahigh
to
temperature
lower
by
9.6-16.5
°C
real-world
conditions.
presents
groundbreaking
approach
design
future
comfortable
personal
Nano-Micro Letters,
Journal Year:
2025,
Volume and Issue:
17(1)
Published: April 29, 2025
Abstract
Hygroscopic
hydrogel
is
a
promising
evaporative-cooling
material
for
high-power
passive
daytime
cooling
with
water
self-regeneration.
However,
undesired
solar
and
environmental
heating
makes
it
challenge
to
maintain
sub-ambient
cooling.
While
different
strategies
have
been
developed
mitigate
heat
gains,
they
inevitably
sacrifice
the
evaporation
regeneration
due
highly
coupled
thermal
vapor
transport.
Here,
an
anisotropic
synergistically
performed
insulation-radiation-evaporation
(ASPIRE)
cooler
by
leveraging
dual-alignment
structure
both
internal
external
coordinated
The
ASPIRE
achieves
impressive
average
temperature
of
~
8.2
°C
remarkable
peak
power
311
W
m
−2
under
direct
sunlight.
Further
examining
mechanism
reveals
that
reduces
gains
without
comprising
evaporation.
Moreover,
self-sustained
multi-day
possible
self-regeneration
at
night
clear
cloudy
days.
synergistic
design
provides
new
insights
toward
high-power,
sustainable,
all-weather
applications.
Nano Letters,
Journal Year:
2024,
Volume and Issue:
24(50), P. 16143 - 16150
Published: Dec. 6, 2024
Solar
evaporation
designs
show
great
promise
in
water
harvesting
without
electricity
inputs.
Unfortunately,
they
have
been
heavily
limited
by
a
low
yield.
To
overcome
this
challenge,
we
introduced
new
architecture
featuring
both
system-level
and
materials-level
designs.
At
the
system
level,
implemented
macropatterned
with
decoupled
design
for
condensation
to
enhance
yield
efficiency.
This
also
ensures
that
condensed
droplets
do
not
block
solar
process.
materials
selective
heating
radiative
cooling
were
applied
improve
passive
performance.
As
proof
of
concept,
our
showed
an
indoor
collection
rate
2.06
kg
m-2
h-1
under
one
sun
average
outdoor
1.85
over
five
consecutive
days.
The
decoupled,
all-passive,
offers
substantial
potential
commercial
applications
toward
mitigating
global
scarcity.
Passive
radiative
cooling
and
solar
heating
have
received
a
great
deal
of
scholarly
attention
as
green
sustainable
ways
to
maintain
thermal
homeostasis.
However,
most
the
current
passive
materials
are
optically
static
cannot
adapt
seasonal
dynamic
weather
changes.
Herein,
we
developed
an
HPC/CaCl2/C
dual-mode
device
(HCC)
that
autonomously
senses
changes
in
ambient
temperature
switch
cooling/heating
modes.
When
reaches
low
critical
solution
(LCST
≈
37
°C)
hydrogel,
side
HCC
gradually
turns
white
reflect
sunlight
happens
by
means
high
infrared
emissivity
(0.97)
atmospheric
window
band
(8–13
μm).
The
heat-absorbing
effect
heated
accelerates
phase
transition
hydrogel
makes
it
change
mode
more
quickly.
is
higher
than
LCST,
at
irradiance
850
W/m2,
HCC-20
coating
leads
cavity
approximately
12.3
°C
theoretical
power
109.3
W/m2.
lower
upper
layer
transparent
transforms
into
function.
Under
conditions
with
500
W/m2
maximum
6
°C,
average
capacity
up
around
8
°C.
can
automatically
between
modes
has
application
potential
fields
such
buildings
automobiles,
providing
favorable
way
mitigate
energy
crises
reduce
greenhouse
gas
emissions.
ACS Omega,
Journal Year:
2024,
Volume and Issue:
9(50), P. 49494 - 49502
Published: Dec. 4, 2024
The
cooling
power
of
radiative
(RC)
coatings
depends
not
only
on
the
properties
coating
but
also
environmental
variables.
In
tropical
environments,
performance
RC
deteriorates
due
to
high
humidity
and
solar
radiation.
Previous
studies
focused
developing
solar-reflective
achieve
subambient
in
environments.
However,
these
have
demonstrated
ability
be
used
at
a
large
scale,
mainly
their
cost
or
less
durability.
Herein,
we
test
an
paint
composed
TiO2
polydimethylsiloxane
(PDMS)
three
different
cities
with
moderate
levels.
Though
significant
reduction
internal
temperature
paint-coated
aluminum
(Al)
box
is
observed,
compared
uncoated
Al
box,
both
achieved.
A
comprehensive
analysis
conducted
clarify
reasons
behind
inability
attain
cooling.
