Mathematics,
Год журнала:
2024,
Номер
12(7), С. 1019 - 1019
Опубликована: Март 28, 2024
Self-oscillatory
systems
have
great
utility
in
energy
harvesting,
engines,
and
actuators
due
to
their
ability
convert
ambient
directly
into
mechanical
work.
This
characteristic
makes
design
implementation
highly
valuable.
Due
the
complexity
of
motion
process
simultaneous
influence
multiple
parameters,
computing
self-oscillatory
proves
be
challenging,
especially
when
conducting
inverse
parameter
design.
To
simplify
computational
process,
a
combined
approach
o0f
Random
Forest
(RF)
Backpropagation
Neural
Network
(BPNN)
algorithms
is
employed.
The
example
used
self-rotating
skipping
rope
made
liquid
crystal
elastomer
(LCE)
fiber
mass
block
under
illumination.
Numerically
solving
governing
equations
yields
precise
solutions
for
rotation
frequency
LCE
various
system
parameters.
A
database
containing
138,240
sets
conditions
corresponding
frequencies
constructed
train
RF
BPNN
models.
training
outcomes
indicate
that
can
accurately
predict
demonstrating
high
stability
efficiency.
allows
us
discover
influences
distinct
parameters
on
as
well.
Moreover,
it
capable
design,
meaning
derive
desired
combination
from
given
frequency.
Through
this
study,
deeper
understanding
dynamic
behavior
achieved,
offering
new
theoretical
foundation
construction.
Chemical Reviews,
Год журнала:
2023,
Номер
123(11), С. 6891 - 6952
Опубликована: Май 3, 2023
All
forms
of
energy
follow
the
law
conservation
energy,
by
which
they
can
be
neither
created
nor
destroyed.
Light-to-heat
conversion
as
a
traditional
yet
constantly
evolving
means
converting
light
into
thermal
has
been
enduring
appeal
to
researchers
and
public.
With
continuous
development
advanced
nanotechnologies,
variety
photothermal
nanomaterials
have
endowed
with
excellent
harvesting
capabilities
for
exploring
fascinating
prospective
applications.
Herein
we
review
latest
progresses
on
nanomaterials,
focus
their
underlying
mechanisms
powerful
light-to-heat
converters.
We
present
an
extensive
catalogue
nanostructured
materials,
including
metallic/semiconductor
structures,
carbon
organic
polymers,
two-dimensional
materials.
The
proper
material
selection
rational
structural
design
improving
performance
are
then
discussed.
also
provide
representative
overview
techniques
probing
photothermally
generated
heat
at
nanoscale.
finally
recent
significant
developments
applications
give
brief
outlook
current
challenges
future
directions
nanomaterials.
Advanced Materials,
Год журнала:
2024,
Номер
36(34)
Опубликована: Март 5, 2024
4D
printing
has
attracted
tremendous
worldwide
attention
during
the
past
decade.
This
technology
enables
shape,
property,
or
functionality
of
printed
structures
to
change
with
time
in
response
diverse
external
stimuli,
making
original
static
alive.
The
revolutionary
4D-printing
offers
remarkable
benefits
controlling
geometric
and
functional
reconfiguration,
thereby
showcasing
immense
potential
across
fields,
including
biomedical
engineering,
electronics,
robotics,
photonics.
Here,
a
comprehensive
review
latest
achievements
using
various
types
materials
different
additive
manufacturing
techniques
is
presented.
state-of-the-art
strategies
implemented
harnessing
4D-printed
are
highlighted,
which
involve
design,
functionalities,
applications.
machine
learning
approach
explored
for
also
discussed.
Finally,
perspectives
on
current
challenges
future
trends
toward
further
development
summarized.
Advanced Materials,
Год журнала:
2023,
Номер
35(45)
Опубликована: Июль 12, 2023
Liquid
crystal
elastomers
(LCE)
and
magnetic
soft
materials
are
promising
active
in
many
emerging
fields,
such
as
robotics.
Despite
the
high
demand
for
developing
that
combine
advantages
of
LCE
actuation,
lack
independent
programming
nematic
order
magnetization
a
single
material
still
hinders
desired
multi-responsiveness.
In
this
study,
ferromagnetic
(magLCE)
ink
with
is
developed
can
be
independently
programmed
to
anisotropic,
referred
"dual
anisotropy",
via
customized
3D-printing
platform.
The
magLCE
fabricated
by
dispersing
microparticles
matrix,
platform
created
integrating
magnet
3-DoF
motion
into
an
extrusion-based
3D
printer.
addition
magLCEs
also
actuated
heating
sources
(either
environmental
or
photo-heating
embedded
microparticles)
energy
density
tunable
actuation
temperature.
A
strip
robot
demonstrated
enhanced
adaptability
complex
environments
(different
terrains,
temperatures)
using
multi-actuation
strategy.
has
potential
applications
mechanical
memory,
multistable
metastructure
array
remote
writability
stable
memory.
ACS Applied Polymer Materials,
Год журнала:
2023,
Номер
5(9), С. 7477 - 7484
Опубликована: Авг. 10, 2023
Liquid
crystal
elastomer
(LCE)
is
a
typical
thermally
responsive
soft
material,
which
an
ideal
candidate
for
fabricating
programmable
shape
changing
structures.
The
anisotropic
changes
of
LCEs
caused
by
the
mesogen
reorientation
are
inherently
different
from
those
other
stimulus-responsive
materials,
such
as
hydrogels
and
dielectric
elastomers.
In
this
paper,
we
first
investigate
bending
behaviors
bilayer
with
monodomain
active
layer
polydomain
passive
layer.
It
shown
that
folding
can
be
obtained
aspect
ratio.
We
further
propose
strategy
to
achieve
complex
activated
LCE
deformations
through
introducing
precuts
into
printed
structures,
change
degrees
freedom
morphing
our
design
beyond
ability
based
on
materials.
Our
method
provide
far-reaching
possibilities
devices
3D
actuators
various
functionalities.
ACS Nano,
Год журнала:
2023,
Номер
17(22), С. 23032 - 23045
Опубликована: Ноя. 8, 2023
Untethered
soft
robots
have
attracted
growing
attention
due
to
their
safe
interaction
with
living
organisms,
good
flexibility,
and
accurate
remote
control.
However,
the
materials
involved
are
often
nonbiodegradable
or
derived
from
nonrenewable
resources,
leading
serious
environmental
problems.
Here,
we
report
a
biomass-based
multistimuli-responsive
actuator
based
on
cuttlefish
ink
nanoparticles
(CINPs),
wood-derived
cellulose
nanofiber
(CNF),
bioderived
polylactic
acid
(PLA).
Taking
advantage
of
photothermal
conversion
performance
exceptionally
hygroscopic
sensitivity
CINPs/CNF
composite
(CICC)
layer
opposite
thermally
induced
deformation
behavior
between
CICC
PLA
layer,
exhibits
reversible
behaviors
under
near-infrared
(NIR)
light,
humidity,
temperature
stimuli,
respectively.
By
introducing
patterned
alignment
structures
combining
them
macroscopic
reassembly
strategy,
diverse
programmable
shape-morphing
2D
3D
such
as
letter-shape,
coiling,
self-folding,
more
sophisticated
deformations
been
demonstrated.
All
these
can
be
successfully
predicted
by
finite
element
analysis
(FEA)
.
Furthermore,
this
has
further
applied
an
untethered
grasping
robot,
weightlifting
climbing
robot
capable
vertical
pole.
Such
actuators
consisting
entirely
biodegradable
will
offer
sustainable
future
for
robots.
Physical review. E,
Год журнала:
2024,
Номер
109(2)
Опубликована: Фев. 5, 2024
Self-oscillating
coupled
systems
possess
the
ability
to
actively
absorb
external
environmental
energy
sustain
their
motion.
This
quality
endows
them
with
autonomy
and
sustainability,
making
have
application
value
in
fields
of
synchronization
clustering,
thereby
furthering
research
exploration
these
domains.
Building
upon
foundation
thermal
responsive
liquid
crystal
elastomer-based
(LCE-based)
spring
oscillators,
a
synchronous
system
comprising
three
LCE-based
oscillators
interconnected
by
springs
is
established.
In
this
paper,
phenomenon
described,
self-oscillation
mechanism
revealed.
The
results
indicate
that
varying
parameters
initial
conditions,
patterns
emerge,
namely,
full
mode,
partial
asynchronous
mode.
For
strongly
interacting
systems,
mode
always
prevails,
while
for
weak
interactions,
adjustment
velocities
magnitude
direction
yields
patterns.
Additionally,
study
explores
impact
several
parameters,
including
LCE
elasticity
coefficient
coefficient,
on
amplitude,
frequency,
system.
findings
paper
can
enhance
our
understanding
behavior
multiple
mutually
promising
applications
harvesting,
soft
robotics,
signal
monitoring,
various
other
fields.
