International Journal of Green Energy,
Год журнала:
2023,
Номер
unknown, С. 1 - 22
Опубликована: Сен. 7, 2023
ABSTRACTAerogels
are
highly
porous
solid-state
structures
with
low
density
and
have
numerous
properties,
such
as
high
absorption
activity,
dielectric
constant,
sound
absorption,
thermal
conductivity.
These
properties
made
aerogels
worthwhile
acoustic
insulators,
pharmaceutical
carriers,
flexible
energy
storage
devices,
a
template
for
synthesizing
inorganic
nanomaterials.
From
an
environmental
aspect,
biodegradable
green
in
light
of
the
research.
Cellulose,
extracted
from
various
natural
sources,
is
most
abundant
environmentally
benign
material
employed
starting
aerogels.
This
review
provides
insights
into
introduction
cellulose
nanofiber
their
fabrication
processes
using
pre-treatment
techniques,
enzymatic,
chemical,
or
ionic-liquid
methods,
several
drying
methods.
Following
this,
performance,
morphology
that
affects
insulation
nano-fibrillated
cellulosic
discussed.
Owing
to
outstanding
insulating
would
be
potential
choice
building
applications.
The
steps
toward
sustainability
require
resource-bounded
research
development.KEYWORDS:
Aerogelsnano-fibrillated
celluloserenewablemorphologythermal
AcknowledgementsThis
study
was
supported
by
project
Science
Engineering
Research
Board,
Government
India,
India
(Grant
No.
CRG/2021/004515).
With
contingency
grant
number
(PM-31-22-728-414),
author,
Shakshi
Bhardwaj,
appreciates
financial
support
Prime
Minister
Fellowship
Program,
India.Disclosure
statementThe
authors
aware
no
personal
conflicts
may
affect
reported
this
study.Abbreviations
SiC-=Silicon
carbideSiOC-=Silicon
oxycarbideSiCN-=Silicon
carbonitrideRF-=Resorcinol
formaldehydeMF-=Melamine
formaldehydeCNCs-=Cellulose
nanocrystalsNFC-=Nano-fibrillated
CelluloseBNC-=Bacterial
nanocelluloseGOs-=Graphene
oxide
sheetsMTMS-=MethyltrimethoxysilaneSGB-=Sugarcane
bagasse
aerogelsFESEM-=Field
emission
scanning
electron
microscopyAFM-=Atomic
force
microscopyXMT-=X-ray
microtomographyPPy-=PolypyrrolePU-=PolyurethaneBCF-=Bleached
fibersCDBAs-=Diacetate-based
aerogelsTDI-
2=2,4-toluene
diisocyanateMoS2-=Molybdenum
disulfideLOI-=Limiting
oxygen
indexCDA-=Cellulose
diacetatePMSQ-=PolymethylsilsesquioxaneMTMS-=MethyltrimethoxysilaneZB-=Zinc
borateMMT-=MontmorilloniteGO-=Graphene
oxidePI-=PolyimideBC-=Bacterial
celluloseCA-=Aramid
fibersNFA-=Nanofiber
aerogelsWH-=Water
hyacinthPVA-=Polyvinyl
acetatePS-=PolystyreneTGA-=Thermogravimetric
analysisMUF-=Melamine
–
urea–formaldehydePPMS-=Pentaerythritol
phosphate
melamine
saltSBC-=Sodium
bicarbonateCAAs-=Cellulose
acetate
aerogelsPFDS-=PerfluorodecyltriethoxysilaneHMDS-=HexamethyldisilazaneMTES-=MethyltriethoxysilaneFS-=Fumed
silicaData
availability
statementNo
data
used
described
article.Additional
informationFundingFunding
supplied
funding-source;
Board
award-id
CRG/2021/004515),
part
initiative.
2.
provided
(PM-31-22-728-414).
Advanced Materials,
Год журнала:
2023,
Номер
36(18)
Опубликована: Ноя. 2, 2023
Abstract
In
recent
decades,
aerogels
have
attracted
tremendous
attention
in
academia
and
industry
as
a
class
of
lightweight
porous
multifunctional
nanomaterial.
Despite
their
wide
application
range,
the
low
mechanical
durability
hinders
processing
handling,
particularly
applications
requiring
complex
physical
structures.
“Mechanically
strengthened
aerogels”
emerged
potential
solution
to
address
this
drawback.
Since
first
report
on
1931,
various
modified
synthesis
processes
been
introduced
last
few
decades
enhance
aerogel
strength,
further
advancing
scope.
This
review
summarizes
state‐of‐the‐art
developments
mechanically
through
multicompositional
multidimensional
approaches.
Furthermore,
new
trends
future
directions
for
prevailed
commercialization
plastic
materials
are
discussed.
Chemical Engineering Journal,
Год журнала:
2024,
Номер
495, С. 153587 - 153587
Опубликована: Июнь 29, 2024
Biomass-based
aerogels
offer
a
promising
potential
as
alternatives
to
plastic-based
foams
for
thermal
insulation
applications.
However,
their
inherent
flammability
has
hindered
practical
usage.
In
this
work,
we
addressed
issue
by
employing
layer-by-layer
assembly
technique
deposit
two
oppositely
charged
biobased
materials,
namely
phytic
acid
and
chitosan,
onto
fully
aerogel
system.
These
were
fabricated
using
cellulose
filaments
chitosan
cross-linked
with
citric
acid,
resulting
in
mechanically
robust
3D
structure.
The
synergistic
effects
of
the
deposited
significantly
enhanced
fire
resistance
mechanical
strength.
developed
six
bilayer
depositions
(LBL6),
showed
an
outstanding
peak
heat
release
rate
(pHRR)
6.0
kW.m−2,
total
(THR)
0.4
MJ.m−2,
substantially
lower
than
previously
cellulose-based
foams.
LBL6
also
demonstrated
immediate
self-extinguishing
behaviour,
boasting
impressive
limiting
oxygen
index
(LOI)
value
63
%,
which
is
highest
reported
aerogel.
Furthermore,
exhibited
superior
Young's
modulus
up
4.5
MPa,
surpassing
flame-retardant
aerogels.
Additionally,
they
excelled
properties,
conductivity
less
38.2
mW·m−1·K−1,
placing
them
same
range
as,
or
even
than,
commercially
available
insulators.
Given
simplicity
development
process
well-known
advantages
completely
system,
our
present
sustainable
environmentally
friendly
alternative
current
commercial
insulators
that
are
derived
from
petroleum-based
materials.
Heliyon,
Год журнала:
2022,
Номер
8(12), С. e11845 - e11845
Опубликована: Дек. 1, 2022
Cellulose
was
extracted
from
the
banana
stem
by
chemical
method
and
factors
affecting
extraction
process
such
as
concentration
of
NaOH
H2O2,
well
assisted
microwave
time
were
investigated.
Design-Expert
software
with
Response
Surface
Methodology
used
in
modeling
optimization
cellulose
process.
The
results
XRD,
FT-IR,
SEM
also
to
determine
physicochemical
properties
obtained
stem.
showed
efficiency
high
applicability
create
valuable
industrial
products.
Due
to
the
extremely
high
porosity
and
low
density
of
nano-porous
thermal
insulation
materials,
characteristic
size
pores
inside
materials
solid
skeleton
structure
are
on
nanometer
scale,
which
leads
obvious
nanoscale
effect
heat
transfer
law
aerogel
materials.
Therefore,
characteristics
existing
mathematical
models
for
calculating
conductivity
various
modes
at
need
be
summarized
in
detail.
Moreover,
order
verify
accuracy
calculation
model
correct
experimental
data
required
modify
model.
Because
medium
is
involved
radiation
transfer,
test
methods
have
a
large
error,
brings
great
difficulties
design
In
this
paper,
mechanism,
characterization
methods,
discussed.
The
main
contents
review
as
follows.
first
part
introduces
structural
specific
application
environment
aerogel.
second
part,
analyzed.
third
summarized.
fourth
fifth
gives
brief
conclusion
prospect.
Catalysts,
Год журнала:
2023,
Номер
13(9), С. 1286 - 1286
Опубликована: Сен. 8, 2023
Aerogels,
due
to
their
unique
features
like
lightweight,
ultra-low
thermal
conductivity,
and
design
variations,
have
gotten
a
lot
of
interest
in
insulation,
photocatalysis,
protective
areas.
Besides
superior
properties,
aerogel
insulation
photocatalyst
materials
also
possess
many
inherent
flaws,
such
as
handling
issues,
high
manufacturing
costs,
low
strength
well
toughness.
The
most
persuasive
successful
ways
improve
photocatalytic
insulating
qualities
while
lowering
costs
are
composition
optimization
microstructure
reconstruction.
Their
surface
area
porosity
make
them
ideal
for
enhancing
the
efficiency
capacity
these
devices.
Research
may
lead
more
efficient
longer-lasting
energy
storage
solutions.
This
review
describes
characteristics,
microstructural
reconstruction,
variation,
properties
all
fabrication
techniques
provides
comprehensive
overview
scientific
achievements
linked
them.
effectiveness
raw
material
compositions,
mechanical
parameters
discussed.
major
goal
this
is
highlight
aerogel-based
variations
explore
potential
development
trends
photocatalysis
applications.
industrial
technical
applications
silica
aerogels
highlighted.
highlights
futuristic
textile
alleviate
CO2
burden
on
our
atmosphere,
either
by
providing
next-level
or
employing
mitigating
technologies
capture.
Chemical Society Reviews,
Год журнала:
2024,
Номер
53(14), С. 7489 - 7530
Опубликована: Янв. 1, 2024
Global
population
growth
and
industrialization
have
exacerbated
the
nonrenewable
energy
crises
environmental
issues,
thereby
stimulating
an
enormous
demand
for
producing
environmentally
friendly
materials.
Typically,
biomass-based
aerogels
(BAs),
which
are
mainly
composed
of
biomass
materials,
show
great
application
prospects
in
various
fields
because
their
exceptional
properties
such
as
biocompatibility,
degradability,
renewability.
To
improve
performance
BAs
to
meet
usage
requirements
different
scenarios,
a
large
number
innovative
works
past
few
decades
emphasized
importance
micro-structural
design
regulating
macroscopic
functions.
Inspired
by
ubiquitous
random
or
regularly
arranged
structures
materials
nature
ranging
from
micro
meso
macro
scales,
constructing
microstructures
often
corresponds
completely
functions
even
with
similar
biomolecular
compositions.
This
review
focuses
on
preparation
process,
concepts,
regulation
methods,
synergistic
combination
chemical
compositions
porous
perspective
gel
skeleton
pore
structure.
It
not
only
comprehensively
introduces
effect
physical
BAs,
but
also
analyzes
potential
applications
corresponding
thermal
management,
water
treatment,
atmospheric
harvesting,
CO
