Macromolecular Chemistry and Physics,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 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
Advanced Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 3, 2025
Abstract
Thermochromic
smart
windows
offer
energy‐saving
potential
through
temperature‐responsive
optical
transmittance
adjustments,
yet
face
challenges
in
achieving
anti‐UV
radiation,
fast
response,
and
high‐temperature
stability
characteristics
for
long‐term
use.
Herein,
the
rational
design
of
Hofmeister
effect‐enhanced,
nanoparticle‐shielded
composite
hydrogels,
composed
hydroxypropylmethylcellulose
(HPMC),
poly(
N,N
‐dimethylacrylamide)
(PDMAA),
sodium
sulfate,
polydopamine
nanoparticles,
anti‐UV,
fast‐response,
all‐day‐modulated
is
reported.
Specifically,
a
three‐dimensional
network
PDMAA
created
as
supporting
skeleton,
markedly
enhancing
thermal
pristine
HPMC
hydrogels.
Sodium
sulfate
induces
effect,
lowering
lower
critical
solution
temperature
to
32
°C
while
accelerating
phase
transition
rates
fivefold
(30
s
vs.
150
s).
Intriguingly,
small‐sized
nanoparticles
simultaneously
enable
high
luminous
66.9%
outstanding
capability.
Additionally,
window
showcases
solar
modulation
(51.2%)
maintains
10.2
reduction
versus
glass
during
all‐day
applications.
The
strategy
effective,
opening
up
new
avenues
manufacturing
fast‐response
durable
thermochromic
energy
savings
emission
reduction.
Passive
cooling
technologies
have
shown
great
interest
recently
due
to
their
free
electricity,
especially
for
radiative
(RC),
and
evaporation
(EC).
While
single-mode
passive
is
often
limited
by
environmental
conditions,
such
as
sunlight,
clouds,
humidity,
resulting
in
a
performance.
To
address
these
issues,
an
adhesive
hydrogel
paint
designed
heat
dissipation
the
daytime
or
high
workload
via
coupled
(REC),
which
also
can
realize
water
self-replenishment
at
night
low
RC-assisted
adsorption
moisture
capture.
Solar
reflectance
R¯solar${{\bar{R}}_{{\mathrm{solar}}}}$
=
0.91
thermal
emittance
ε¯LWIR${{\bar{\varepsilon
}}_{{\mathrm{LWIR}}}}$
0.94
are
obtained
RC.
Excellent
performance
be
achieved
painting
it
on
3D
W-shaped
substrate.
Compared
with
flat
RC
paint,
REC
W-shape
substrate
achieves
temperature
drop
of
5.4
°C
heating
density
100
W
m-2,
further
increased
11.4
400
m-2
multi-passive
strategies.
This
structural
material
design
provides
potential
outdoor
dissipation.
Applied Physics Letters,
Год журнала:
2025,
Номер
126(11)
Опубликована: Март 1, 2025
The
reversible
transformation
of
radiative
cooling
and
solar
heating
the
film
is
significant
for
a
building's
energy
conservation
carbon
emission
reduction.
current
technology
constrained
by
its
reliance
on
complex
control
mechanisms
narrow
scope,
which
collectively
impede
practical
deployment.
In
this
Letter,
we
introduce
an
all-season
smart
film,
multilayer
composed
In3SbTe2
(IST),
CaF2,
ZnS
Al
substrate,
possesses
unique
ability
to
synergistically
modulate
solar-thermal
radiation.
absorptance
infrared
emittance
are
(anormal,
εnormal)
=
(0.829,
0.055)
mode
(0.361,
0.835)
mode,
respectively.
underlying
mechanism
pertains
Fabry–Pérot
resonance
antireflection.
modulation
property
remains
excellent
even
when
incident
angle
large.
Furthermore,
capable
achieving
multilevel
through
alteration
crystalline
IST
percentage.
properties
substantiated
quantitative
assessment
net
heat
flux
terrestrial
applications.
This
analysis
reveals
that
with
amorphous
achieves
800
W/m2
at
250
K,
while
it
exhibits
600
330
K.
Such
simple
structure
can
be
easily
fabricated,
would
facilitate
advancement
implementation
film.
Advanced Functional Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 18, 2025
Abstract
Thermochromic
fluorescent
materials
(TFMs)
have
garnered
great
attention
due
to
their
unique
fluorescence
transition
responsive
temperature.
However,
the
application
of
TFMs
is
limited
defects
such
as
low
thermosensitivity
and
a
high
temperature‐responsive
threshold
value.
In
this
case,
work
explores
feasible
strategy
for
designing
TFMs.
On
one
hand,
sterically
hindered
unilateral
tetraphenylethylene
(TPE)
substituent
introduced
into
pyrene
chromophore
in
meta‐
linkage
mode.
This
type
molecular
architecture
aimed
at
integration
both
aggregation‐induced
emission
(AIE)
character
isolated
π–π
dimer
stacking,
facilitating
achievement
contrast
intensity
(i.e.,
strongly
emissive
aggregation
state
versus
weakly
dispersion
state)
color
(
i.e
,
excimer
monomer).
other
an
effective
matrix
platform
featured
with
alky
chain
length‐dependent
temperature‐induced
phase
constructed
assist
fabrication
desired
patterns
through
temperature‐controlled
reversible
between
crystalline
non‐dispersion
liquated
states.
The
findings
demonstrate
that
these
studied
can
be
potentially
applied
temperature
indicators
switchable
dynamic
interior
decoration,
which
provides
new
avenue
design
Applied Physics Letters,
Год журнала:
2025,
Номер
126(11)
Опубликована: Март 1, 2025
Passive
solar
heating
and
radiative
cooling
attracted
lots
of
attention
in
global
energy
consumption
reduction
due
to
their
unique
electricity-free
advantage.
However,
static
single
radiation
or
would
lead
over-cooling
over-heating
cold
hot
weather,
respectively.
How
achieve
effective
self-adaptive
thermoregulation
is
critical
for
dynamic
thermal
management.
Hence,
this
work,
a
strategy
was
designed
by
coupling
latent
heat
storage
release
with
reversible
cooling.
A
commercial
memory
alloy
could
realize
at
the
temperature
between
high
reflectance
R¯solar
=
0.95
emittance
ε¯LWIR
0.93,
absorptance
α¯solar
0.92
low
ε¯IR
0.08.
High
conductive
phase
change
material
further
improve
performance
∼136
J
g−1,
conductivity
3.4
W
m−1
K−1,
resulting
superior
than
(39.9
vs
36.9
°C)
(33.8
35.5
°C).
The
maximum
increase
be
12.7
°C
situation,
drop
8.3
situation.
Energy
calculation
showed
that
sample
save
68%–90%
annual
compared
common
roof,
indicating
spectral
regulation
can
greatly
total
