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RISS 인기검색어
- 검색키워드
- 저자 : Walish, Joseph J. (검색결과 2 건)
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Bioinspired Electrochemically Tunable Block Copolymer Full Color Pixels
Walish, Joseph J.,Kang, Youngjong,Mickiewicz, Rafal A.,Thomas, Edwin L. WILEY-VCH Verlag 2009 Advanced materials Vol.21 No.30
<B>Graphic Abstract</B> <P>A variety of fish and cephalopods use tunable 1D photonic crystals to signal and display information. These animals control the color of the reflectors through chemical secretion by the sympathetic nervous system, which reduces the distance between platelets in reflective cells. This control can be mimicked by a bioinspired, 1D photonic block copolymer that is made tunable (see figure) by the production of chemical species through electrochemistry. <img src='wiley_img/09359648-2009-21-30-ADMA200900067-content.gif' alt='wiley_img/09359648-2009-21-30-ADMA200900067-content'> </P>
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Broad-wavelength-range chemically tunable block-copolymer photonic gels
Kang, Youngjong,Walish, Joseph J.,Gorishnyy, Taras,Thomas, Edwin L. Nature Publishing Group 2007 NATURE MATERIALS Vol.6 No.12
Responsive photonic crystals have been developed for chemical sensing using the variation of optical properties due to interaction with their environment. Photonic crystals with tunability in the visible or near-infrared region are of interest for controlling and processing light for active components of display, sensory or telecommunication devices. Here, we report a hydrophobic block–hydrophilic polyelectrolyte block polymer that forms a simple one-dimensional periodic lamellar structure. This results in a responsive photonic crystal that can be tuned via swelling of the hydrophilic layers by contact with a fluid reservoir. The glassy hydrophobic layer forces expansion of the hydrophilic layer along the layer normal, yielding extremely large optical tunability through changes in both layer thickness and index of refraction. Polyelectrolyte polymers are known to be highly responsive to a range of stimuli. We show very large reversible optical changes due to variation of the salt concentration of a water reservoir. These one-dimensional Bragg stacks reflect incident light from the ultraviolet–visible region to the near-infrared region (λpeak=350–1,600 nm) with over a 575% change in the position of the stop band. Our work demonstrates the extremely high responsivity possible for polyelectrolyte-based photonic materials.
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