Optics: measuring and testing – By shade or color – Fluid color transmission examination
Patent
1998-09-15
2000-07-25
Font, Frank G.
Optics: measuring and testing
By shade or color
Fluid color transmission examination
356415, 359288, G01N 2125
Patent
active
060942738
ABSTRACT:
Devices that comprise novel, mesoscopically periodic materials that combine crystalline colloidal array (CCA) self-assembly with the temperature ined volume phase transitions of various materials, preferably poly(N-isopropylacrylamide) (PNIPAM) are disclosed. In one embodiment, a PNIPAM CCA is formed in an aqueous media and contained within cell means. In another embodiment, a CCA of charged particles is formed and polymerized in a PNIPAM hydrogel. Methods for making these devices are also disclosed. The devices of the present invention are useful in many applications including, for example, optical switches, optical limiters, optical filters, display devices and processing elements. The devices are further useful as membrane filters. All of these devices have the feature of being tunable in response to temperature. Devices that change diffracted wavelength in response to pressure are also disclosed.
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Asher Sanford A.
Sunkara Hari B.
Weissman Jesse M.
Font Frank G.
Ratliff Reginald
University of Pittsburgh of the Commonwealth System of Higher Ed
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