may 24, 2005 advanced liquid crystal technologies, inc. 1 liquid crystalline elastomers as...
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May 24, 2005 Advanced Liquid Crystal Technologies, Inc.
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Liquid Crystalline Elastomers as Artificial Muscles
P.E. Cladis
Advanced Liquid Crystal Tech.
Summit, NJ 07902-1314
May 24, 2005 Advanced Liquid Crystal Technologies, Inc.
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Stress-Strain in Smectic A SLCEs
Strasbourg ILCC 1998 – Nicole Assfalg
Alumni from Heino Finkelmann's Group
See also: Liquid crystalline elastomers as artificial muscles
May 24, 2005 Advanced Liquid Crystal Technologies, Inc.
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Spontaneous Shape Change: Sample Preparation
P.E. Cladis: Phase Transitions in Liquid Crystalline Elastomers:A Fundamental Aspect of LCEs as Artificial Muscles in Interactive Dynamics of Convection and Solidification, P. Erhard, D.S. Riley and P.H. Steen (eds), Kluwer Academic Publishers, Dordrecht (2001) p. 123.
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Spontaneous Shape Change: Result
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Goal
1998 Symposium on Artificial Muscles and Liquid
Crystalline Elastomers Partially supported by NSF DMR 9871475
http://alct.com/fps/index.htm
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First works
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Graduation
First Results: Thin samples
Kyushu University 2001
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Swelling Dynamics: Samples
PR E 69, 021710 (2004)
Swelling dynamics of liquid crystal elastomers swollen with low molecular
weight liquid crystals Yusril Yusuf,* Y. Ono, Y. Sumisaki,
P. E. Cladis†, H. R. Brand, H.Finkelmann,Shoichi Kai‡
Sample 5CB & MBBA swelling agent
Monomer and Polydomain LCEsFrom Heino Finkelmann’s Lab
150m thick, 1x0.5mm2
Viewed in Polarizing Microscope
Swollen Nematic LSCE
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MONO1
Dimension || n does not change!PR E 69, 021710 (2004)
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MONO2 and POLY
PR E 69, 021710 (2004)
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Picture
PR E 69, 021710 (2004)
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Swelling Dynamics
POLY:
5CB ~8min
MBBA ~6min
MONO:
5CB ~16min
MBBA ~30min
Inverse swelling ratio
PR E 69, 021710 (2004)
May 24, 2005 Advanced Liquid Crystal Technologies, Inc.
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Swelling Temperature Dependence
Temperature dependence
None for Dry POLY
Lots for MONO and Swollen POLY
PR E 69, 021710 (2004)
MO
NO
1P
OL
Y
Dry
swollen
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Electric Field
Yusuf et al. PRE 71, 061702 (2005)
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Voltage Dependence
Yusuf et al. Low-voltage-driven electromechanical effects of
swollen liquid-crystal elastomers ...
Threshold about 1.5V independent of sample thickness – typical for LMWLCs
Better reorientation, larger shape change – cf Slide 8
May 24, 2005 Advanced Liquid Crystal Technologies, Inc.
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Temperature Dependence
Yusuf et al. PR E June 2005
MONO1 – maximum depends on sample thickness,
here about 20mMONO2 –
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Characteristic Times,
Yusuf et al. PR E June 2005
Switch on Switch off
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Voltage Dependence of 1/
Yusuf et al. PR E June 2005
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Voltage Summary
Yusuf et al. PR E June 2005
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Acknowledgements
We thank the IMA for the opportunity to present these results.
Yusril Yusuf,* Y. Ono, Y. Sumisaki, Jong-Hoon Huh, H. R. Brand, H.Finkelmann, Shoichi Kai‡
Nicole Assfalg
PEC thanks the Japan Society for the Promotion of Sciences for a Research Prize enabling this research.
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Kyushu 3/2001