In
the
past
years,
a
great
deal
of
attention
has
been
paid
to
passive
cooling
envelope
materials
or
smart
windows
cope
with
increase
in
building
energy
consumption
due
global
warming.
However,
combining
curtains
could
enable
on-demand
thermal
management
based
on
its
dynamically
adjustable
characteristics.
Herein,
superhydrophobic
cotton
fabric
low
conductivity
(0.0342
W/mK),
high
solar
reflectivity
(0.9280)
and
infrared
emissivity
(0.9698)
was
obtained
by
wrapping
porous
SiO2/poly(vinylidene
fluoride-hexafluoropropylene)
composite
coating
via
solvent
exchange
phase
separation
sanding.
The
fabrics
realized
an
average
10.3℃
during
daytime
showed
impressive
performance
relative
pristine
cotton.
Notably,
demonstrated
superior
nighttime
insulation
outdoor
testing
simulations
compared
commercial
curtains.
Therefore,
as
allow
for
reducing
broadening
practical
application
radiative
materials.
ACS Sustainable Chemistry & Engineering,
Journal Year:
2024,
Volume and Issue:
12(14), P. 5695 - 5704
Published: March 27, 2024
Daytime
passive
radiative
cooling
is
an
effective
way
to
reduce
energy
consumption
for
building
cooling.
However,
overcooling
might
occur
in
at
low-temperature
which
presents
limitations
thermal
management.
Herein,
a
new
SiO2/poly(vinyl
alcohol)
composite
aerogel
with
nanomicro–multistage
porous
structure
insulation
and
was
fabricated
by
non-solvent-assisted
freeze-drying
strategy.
In
the
fabrication
process,
nonsolvent
(acetone)
poly(vinyl
utilized
control
proportion
size
of
macro-porous
inside
aerogel,
making
conductivity
decreased
0.0390
W/mK
while
spontaneously
increasing
its
solar
reflectance
infrared
(8–13
μm)
emissivity
93.70%
98.19%,
respectively.
The
achieved
sub-ambient
up
14.1
°C
during
day
above-ambient
warming
3.8
night,
avoiding
nighttime
overcooling.
demonstrates
adaptive
management
compared
commercial
materials,
it
suitable
intelligent
energy-saving
buildings.
Radiative
cooling
technology
has
major
benefits
for
energy-free
thermoregulation
since
it
can
chill
items
without
using
any
energy.
However,
the
efficacy
of
radiative
materials
is
hampered
by
outdoor
pollution
as
well
a
number
safety
issues
involved
in
practical
applications,
particular,
fire
hazard
polymer-based
materials.
Here,
porous
composite
film
was
created
and
manufactured
that
flame-retardant,
cooling,
superhydrophobic.
The
average
infrared
emissivity
reached
97.2%
with
an
solar
reflectance
up
to
98.4%.
It
produced
subambient
environment,
temperature
decrease
11.5
°C.
With
sliding
angle
3.6°
water
contact
158.7°,
surface
exhibits
conventional
self-cleaning
properties
Notably,
flame-retardant
limiting
oxygen
index
38.3%,
which
suitable
requirements.
Journal of Materials Chemistry A,
Journal Year:
2024,
Volume and Issue:
12(32), P. 20921 - 20926
Published: Jan. 1, 2024
A
bilayer
coating
consisting
of
a
white
base
and
fluorescent
blue
top
layer
is
designed
for
subambient
cooling.
The
enhanced
photoluminescence
high
scattering
properties
are
the
key
parameters
realizing
whole-color-gamut
