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Colorimetry of Fractured Cholesteric Liquid Crystal Polymers

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Cholesteric liquid crystals produce reflection or transmission which is selective with regard to both polarization and wavelength. Thermal fracturing of the polymer form of cholesteric liquid crystals creates a new form called flakes. Light-, scanning electron-, and atomic force microscopies confirm that these cholesteric flakes maintain the same periodic structure that is responsible for the selective optical effects of the unfractured cholesteric.

Because they can be mixed with a host and because of their color gamut, cholesteric flakes are being developed as a new kind of paint. Applications for cholesteric flake paint focus on its ability to selectively reflect one handedness of circular polarization within a narrow wavelength band and on its ability to produce a wide color gamut by classic color additivity. Colorimetric techniques specify the chromaticity of this new type of colorant which is both polarization- and angle-sensitive.
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Document Type: Research Article

Publication date: January 1, 1995

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  • CIC is the premier annual technical gathering for scientists, technologists, and engineers working in the areas of color science and systems, and their application to color imaging. Participants represent disciplines ranging from psychophysics, optical physics, image processing, color science to graphic arts, systems engineering, and hardware and software development. While a broad mix of professional interests is the hallmark of these conferences, the focus is color. CICs traditionally offer two days of short courses followed by three days of technical sessions that include three keynotes, an evening lecture, a vibrant interactive (poster) papers session, and workshops. An endearing symbol of the meeting is the Cactus Award, given each year to the author(s) of the best interactive paper; there are also Best Paper and Best Student Paper awards.

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