Macromolecular Chemistry and Physics,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 31, 2024
Abstract
Smart
windows
can
effectively
balance
the
space
temperature
of
buildings
without
compromising
essential
functions
windows.
However,
conventional
thermochromic
have
limited
sunlight
regulation
capabilities
and
face
challenges
with
switching
as
desired.
Herein,
A
class
novel
smart
based
on
crystal
hydrogels
is
introduced
that
achieve
free
between
transparent
(for
heating)
opaque
radiative
cooling)
states
through
thermal
mechanical
stimuli.
The
are
made
from
cross‐linked
polyacrylamide
(PAM)
sodium
acetate
(NaAc).
By
optimizing
concentration
sample
thickness,
combination
excellent
cooling
ability
achieved
at
state
good
low‐temperature
stability
in
hydrogels.
Using
optimized
hydrogel
to
prepare
a
window
equipped
heater
trigger
tip,
rapid
on‐demand
transition
demonstrated.
results
indicate
lowers
temperatures
by
up
9.4
°C
compared
ordinary
maintains
stable
emissivity
reflectivity
even
after
100
cycles
due
its
robust
solar
modulation
capabilities.
This
technology
provides
new
energy‐saving
solutions
for
but
also
explores
future
applications
materials,
showcasing
innovative
advantages
technical
strengths
Optics Express,
Journal Year:
2024,
Volume and Issue:
32(23), P. 41213 - 41213
Published: Oct. 16, 2024
This
paper
proposes
a
smart
window
for
radiative
cooling
with
adjustable
transparency
by
leveraging
the
phase
transition
property
of
VO
2
.
The
proposed
exhibits
daytime
visible
light
transmission
and
near-infrared
reflection,
all-day
cooling,
nighttime
privacy
protection
feature.
It
comprises
bottom
layer
/Ag/VO
top
cubic
two-dimensional
SiO
gratings,
structural
parameters
optimized
genetic
algorithm
to
ensure
excellent
optical
performance.
In
daytime,
75.4%
transmittance
87.8%
reflectance
can
be
achieved
utilizing
dielectric
state
also
achieves
low
9.8%
using
metallic
,
which
is
suitable
protection.
Furthermore,
it
has
an
outside
emissivity
98.2%
together
inside
1.9%
effectively
inhibiting
radiation
heat
transfer.
addition,
structure
insensitive
angles
incidence
polarization
light,
making
advantageous
cooling.
During
reduces
temperature
17.7
K
compared
glass
equal
thickness
when
non-radiative
coefficient
12
W/m
/K.
At
night,
power
124.7
achieving
effect
8.9
below
ambient
temperature.
promising
various
application
scenarios
could
used
as
windows
buildings
vehicles.
