http://hdl.handle.net/10061/6645 Wed, 22 May 2013 01:51:02 GMT 2013-05-22T01:51:02Z http://hdl.handle.net/10061/8609 Title: Chiral meta-interface: Polarity reversal of ellipticity through double layers consisting of transparent chiral and absorptive achiral media Authors: Satoshi Tomita; Yuuka Kosaka; Hisao Yanagi; Kei Sawada Abstract: We have studied circular dichroism (CD) in the visible region of composite and double-layer films consisting of a transparent chiral molecule, glucose, and an absorptive achiral dye, rhodamine. Composite and double-layer films show an absorption-induced CD response caused by chirality of glucose at 540 nm, where the rhodamine exhibits absorption. More importantly, in double layers, the polarity of the ellipticity in CD signals is found to be reversed when the incident direction is reversed. We discuss the origin of the polarity reversal, which is very similar to the magneto-optical effect, at the chiral meta-interface without magnetic field. Tue, 22 Jan 2013 00:00:00 GMT http://hdl.handle.net/10061/8609 2013-01-22T00:00:00Z http://hdl.handle.net/10061/8601 Title: Piezochromic Fluorescence in Liquid Crystalline Conjugated Polymers Authors: Wang-Eun Lee; Chang-Lyoul Lee; Toshikazu Sakaguchi; Michiya Fujiki; Giseop Kwak Abstract: Liquid crystalline diphenylacetylene polymer derivatives showed piezochromic fluorescence via order-to-disorder phase transition. Tue, 08 Feb 2011 00:00:00 GMT http://hdl.handle.net/10061/8601 2011-02-08T00:00:00Z http://hdl.handle.net/10061/8599 Title: Light Scattering Study on the Structure of Pure Polystyrene Authors: Michiya Fujiki; Shigeru Oikawa Abstract: An unusual temperature dependence of light scattering properties by pure polystyrene (PS) was observed in the temperature range of 30?170°C: the V′v and Vviso′ intensities minimized near Tg, and the H′v intensity changed with measuring temperatures. These phenomena can be explained by “the scrambling effects of incident and scattered light” during transmission through the sample, as previously pointed out for PS glass by Claiborne and Crist. The PS sample used was prepared by a very careful procedure in which the evaporable monomer, initiator, and chain transfer agent were distilled in a closed vacuum system and in situ polymerization was carried out above Tg. The corrected Vviso intensity for PS glass was favorably compared with the values calculated from the thermal density fluctuation, indicating that PS glass was in a frozen state near Tg. The corrected Hv intensity for PS glass was nearly equal to the heretofore calculated value, assuming a randomly oriented anisotropic liquid for PS. Our experimental results showed no evidence for an ordered structure in pure PS glass, as is found in pure poly(methyl methacrylate) glass, but PS rubber has a partially oriented state. Sun, 01 Jan 1984 00:00:00 GMT http://hdl.handle.net/10061/8599 1984-01-01T00:00:00Z http://hdl.handle.net/10061/8600 Title: Light Scattering Study on the Structure of Pure Poly(methyl methacrylate) Authors: Michiya Fujiki; Toshikuni Kaino; Shigeru Oikawa Abstract: The polarized and depolarized components of light scattering by pure poly-(methyl methacrylate) (PMMA) were measured as a function of temperature above and below Tg. The PMMA sample used was prepared by a very careful procedure in which the evaporable monomer, initiator, and chain transfer agent were distilled in a closed vacuum system and in-situ polymerization was carried out above Tg. The measured Vviso intensities were favorably compared with the values calculated from thermal density fluctuation in the temperature range from 20 to 140°C. The measured intrinsic Hv intensity was fairly close to the value calculated assuming a randomly oriented anisotropic liquid for PMMA. Our experiment showed no evidence for an ordered structure in pure PMMA glass, as is found in pure polystyrene glass. Sat, 01 Jan 1983 00:00:00 GMT http://hdl.handle.net/10061/8600 1983-01-01T00:00:00Z