Radiative
cooling,
a
passive
cooling
technology,
functions
by
reflecting
the
majority
of
solar
radiation
(within
spectrum
0.3-2.5
μm)
and
emitting
thermal
atmospheric
windows
8-13
μm
16-20
μm).
Predominantly,
synthetic
polymers
are
effectively
utilized
for
radiative
while
posing
potential
environmental
hazards
due
to
their
complex
components,
toxicity,
or
nonbiodegradation.
Bacterial
cellulose,
natural
renewable
biopolymer,
stands
out
its
environmentally
friendly,
scalability,
high
purity,
significant
infrared
emissivity.
In
this
work,
we
developed
bacterial
cellulose-based
composite
film
(BCF)
with
cross-linked
network
structure
facile
agitation
spraying
method
achieve
enhanced
sustainable
performance.
The
BCF
exhibited
superior
optical
properties
tolerance,
notable
emissivity
94.6%.
As
result,
emitter
demonstrates
substantial
subambient
capacity
(11:00
13:00,
maximum
drop
7.15
°C,
average
4.85
°C;
22:00
2:00,
2.7
2.32
°C).
Additionally,
maintained
stable
after
240
h
continuous
UV
irradiation.
Furthermore,
can
preserve
freshness
fruits
under
intense
Hence,
performance
presents
broad
application
prospect
in
building
energy
conservation,
cells
efficiency
enhancement,
food
transportation
packaging.
Advanced Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 2, 2025
Abstract
Air
pollutants,
particularly
highly
permeable
particulate
matter
(PM),
threaten
public
health
and
environmental
sustainability
due
to
extensive
filter
media
consumption.
Existing
melt‐blown
nonwoven
filters
struggle
with
PM
0.3
removal,
energy
consumption,
disposal
burdens.
Here,
an
ultralight
composite
a
vertical
ternary
spatial
network
(TSN)
structure
that
saves
≈98%
of
raw
material
usage
reduces
fabrication
time
by
99.4%,
while
simultaneously
achieving
high‐efficiency
removal
(≥99.92%),
eco‐friendly
regeneration
(near‐zero
consumption),
enhanced
wearing
comfort
(breathability
>80
mm
s⁻¹,
infrared
transmittance
>85%),
is
reported.
The
TSN
consists
hybrid
layer
microspheres
(average
diameter
≈1
µm)/superfine
nanofibers
(≈20
nm)
sandwiched
between
two
nanofiber
scaffolds
(diameter
≈400
nm
≈100
nm).
This
arrangement
offers
high
porosity
(≈85%),
ultralow
areal
density
(<1
g
m
−2
),
alow
airflow
resistance
(<90
Pa),
guaranteeing
superb
thermal
comfort.
Notably,
utilizing
scalable
one‐step
free
surface
electrospinning
technology,
mats
can
be
mass‐produced
at
rate
60
meters
per
hour
(width
1.6
meters),
which
critical
verified
for
various
applications
including
window
screens,
individual
respiratory
protectors,
dust
collectors.
work
provides
viable
strategy
designing
high‐performance
through
structural
regulation
in
scalable,
cost‐effective,
sustainable
way.
