photogated motility - d2cax41o7ahm5l.cloudfront.net · color switch between blue and yellow...
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Photogated motility
in smart actuators
with dual response
Speaker: Lidong Zhang
Postdoc in Prof. Naumov group
in New York University
International Conference and Expo on Smart materials
& Structures, June 15-17, Las Vegas, USA
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Extensive reduction of pollution needed to save
environment:
Coal-fired power plants are the largest source of pollution
The pollution produces severely damage human health and quality
of life.
Air pollution is a prime contributor to global warming.
Cleaning up these plants and finding cleaner, alternative energy
sources is the overall objective to achieving clean, healthy air in
every country.
Environmental contamination
Image source: https://saferenvironment.wordpress.com/
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Exploitation of clean energy from humidity
Video source: https://www.youtube.com/watch?v=TOJG5mF6OLs
Development of a new material for conversion of potential energy of
humidity to mechanical work
Generation of electricity without contamination of the environment
Device for generation of electricity
Actuator
Humidity
switch
Heater
Air
Water
Generator
+- Vout
Energy
harvester
Goal:
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Hydrogel
Hydrogel film
water sorption
Deformation
Good flexibility
Water uptake
and swelling
Lidong Zhang, et al. RSC Adv., 2013, 3, 4692Lidong Zhang, et al. Macromol. Biosci., 2014, 14, 401;Lidong Zhang, et al. Polym. Chem., 2013, 4, 1084;
Research background
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Photosensitive segment
Hydrogel (agarose)
Flexible segment Photosensitive segment
Humidity-, and light-sensitive film
Hybridization
Preparation of smart hybrid film
Lidong Zhang. et al. Nature Commun., 2015, 6, 7429.
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Humidity
Energy conversion from humidity
Humidity
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The humidity-driven bending is directional
Bending cycle testingOnly water as energy source
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Light-driven bending is non-directional
Conversion of light and heat energy
UV power: 20 mW cm-2
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Thickness of film / µm
0 40 80 120 160 200
0
40120
140
160
Cargo:film weight ratio8 16 24 320
0
10
Temperature / oC
25 30 35 40 45 50 55 60 65 70 75
20
40
Factors that affect motility of films
9
F/ m
in -
1
F = Frequency
F/ m
in -
1
F/ m
in -
1
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Humidity-driven crane and soft robots
Film:
13 mg
Cargo:
1110 mg
207.9 kg
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Kinematics and mechanism of locomotion
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Square
Rectangle
Strip
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Photomodulated humidity-driven motion
Motion starts Motion stops
Motion
starts
Film on a
moist paper
UV light off
UV light off
UV light on
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7/17/2015 13
Mechanism of photomodulated motion
Photosensitive
Hygrosensitive
Light-induced bending force
Humidity-induced bending force
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pH-induced color change of the film
Alkali-solution as ink for writingColor switch between blue and yellow
BHSB (1,4-bis(p-hydroxystyryl)benzene) is a
fluorescent molecule strongly responsive to pH color
change.
Agarose is a gel material strongly responsive to
humidity with great change in shape.
BHSB
Agarose
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7/17/201515
Light-triggered motility of the film
UV light
https://www.youtube.com/watch?v=g8mr0R3ibPU
Thermal effect
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Mechanism of the response to light
(c) Time-dependent UV–Vis spectra of the film recorded
during continuous UV irradiation.
(d) Evolution of the UV–Vis spectrum recorded after the
film was irradiated with UV light for 10 minutes (‘UV’)
and then kept in visible light (‘Vis’).
(e) Time-dependent UV–Vis spectra of BHSB irradiated
with UV light in DMF.
trans-to-cis
isomerization in dry
film
cis-to-trans isomerization in dry film
trans-to-cis isomerization
in DMF solution
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Characterization of motility
Thickness effect
Repetition of the bending
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Simulation of Cucumber tendril
Humidity-triggered curling of the film
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Simulation of Erodium seed
https://www.youtube.com/watch?v=--C0921z9K4
https://www.youtube.com/watch?v=TOJG5mF6OLs
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Humidity-triggered motility of the film
Motion without UV light Motion with UV light
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Application for power device
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Conclusions
The hybrid films strongly respond to humidity, UV light and
heat.
The film is able to convert potential energy of humidity into
mechanical work.
The film can transport cargos when driven by humidity.
The motion of the film can be modulated by UV light.
The film can be combined with piezotransducer to generate
electricity.
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Many thanks to New York University in Abu Dhabi and
Prof. Panče Naumov for supporting this work
Thanks to group members for the help with my research
Acknowledgements