Flexible foil moveable by means of light

Details Flexible foil moveable by means of light Flexible foil moveable by means of light

2005-01-26

2009-06-16

Wu, Shean C (Department: 1795)

Compositions

Liquid crystal compositions

C252S299100, C359S241000

Reexamination Certificate

active

07547402

ABSTRACT:
A flexible foil which is moveable by light includes a dye which is capable of changing shape when absorbing light of a predetermined wavelength. The dye is dispersed in the foil such that, near at least one major surface of the foil, the dye is anisotropically oriented. Transverse to the foil, the concentration and/or orientation of the dye changes in an asymmetric manner. The change in orientation and/or concentration is such that, when exposed to light of the predetermined wavelength, the flexible foil moves. When exposed the dye changes shape which change in shape causes a change in lateral dimension of the foil which change in lateral dimension is, due to the change in concentration and/or orientation of the dye, different at different locations with the foil. This causes the flexible foil to move or more particular bend.

REFERENCES:
patent: 5668614 (1997-09-01), Chien et al.
patent: 5686153 (1997-11-01), Heynderickx et al.
Ikeda et al., “Anisotropic Bending and Unbending Behavior of Azobenzene Liquid Cyrtalline Gels by Light Exposure”, Advanced Materials 2003, vol. 15, No. 3, pp. 201-205.

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