Download or read book Effects on Gas Chromatographic Peaks of Electric Fields Applied Across Cholesteric Liquid Crystal Stationary Phases written by and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Earlier studies have shown that a static electric field across a capillary column increased the apparent capacity ratio (measured from the peak maximum) of a liquid crystal stationary phase and produced a more nearly Gaussian-shaped peak plus a small step on the front of the peak. The present study has qualitatively confirmed those effects using cholesteryl laurate, cholesteryl 10-undecenoate, and cholesteryl benzoate and suggests that they may be found for all cholesteric liquid phases. In addition, the peak-fronting phenomenon was found to be a function of both the carrier gas and the applied column potential. Fragmentation of the solute and/or the stationary phase by carrier gas molecules in metastable excited states is proposed to explain the fronting phenomenon. Hysteresis effects have also been observed, indicating that the liquid crystals may take hours to return to their original orientations after imposition or removal of an electric field.
Download or read book Part 1 Effects on Gas Chromatographic Peaks of Electric Fields Applied Across Cholesteric Liquid Crystal Stationary Phases Part 2 Effects of Pressure Temperature Adsorbent Surface and Mobile Phase Composition on the Supercritical Fluid Chromatographic Fractionation of Monodisperse Polystyrenes written by James Earl Conaway and published by . This book was released on 1977 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1978 with total page 1008 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1978 with total page 1150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1978-03-31 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spectral Data for Steroids written by Michael Frenkel and published by CRC Press. This book was released on 1994-06-15 with total page 998 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spectral Data for Steroids provides a comprehensive compilation of spectral data for 211 steroids. The compounds are arranged on the basis of their molecular structures:
Download or read book Government Reports Annual Index written by and published by . This book was released on 1978 with total page 1610 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.
Download or read book Comprehensive Dissertation Index written by and published by . This book was released on 1984 with total page 910 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1978 with total page 744 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Study of the Effects of Varying Electric Field and Temperature Upon Liquid Crystals Used as Gas Chromatographic Liquid Phases written by Steve Edward Unger and published by . This book was released on 1979 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book American Doctoral Dissertations written by and published by . This book was released on 1977 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Gas Chromatography Literature Abstracts and Index written by and published by . This book was released on 1979 with total page 1078 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Current Programs written by and published by . This book was released on 1977 with total page 506 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Abstracts of Papers written by American Chemical Society. Meeting and published by . This book was released on 1977 with total page 1052 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Electric Field Surface Alignment and Guest Materials in Cholesteric Liquid Crystals written by Rafael Soares Zola and published by . This book was released on 2012 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation research is focused on understanding aspects of cholesteric liquid crystals when different effects are taken into account, such as external field, surface alignment effect and guest materials, aiming possible applications such as for displays. More specifically, we studied the effect of different chiral dopants on the physical properties of the nematic host, showing that large changes may happen depending on the nature of the dopant, which as a matter of practicality, can be used for designing better displays. We found a naturally occurring chiral dopant that improves many physical parameters of the nematic host, yielding better displays. We also studied the effect of external electric fields and the transitions between cholesteric textures. This study led us to propose driving schemes and display designs, where extensive efforts were made to optimize active and passive matrices for bistable cholesteric displays. We also performed studies on the surface effect for improving the features of cholesteric displays. Furthermore, we used a surface enhanced effect to study the wetting of cholesteric liquid crystals under the isotropic-cholesteric transition and the stripe pattern occurring in the wetting layer. By using experiments and computer simulations we have shows that the delicate anchoring at the isotropic-cholesteric interface induces the pattern observed, depending on the elastic anisotropy and pitch length of the material. We also present a study of reflection broadening induced by DC fields when a small amount of polymer is dispersed in the cholesteric material, which is a great advantage over previous reported methods to induce bandwidth broadening and can be used as a switchable mirror. We propose a mechanism to explain the data. Last we include results on cholesteric phases made with bent-cores, and mixtures of bent-core and rod-like cholesteric liquid crystals. The results found in this last chapter yields the possibility of UV detectors as well as cholesteric displays sensitive to light, temperature and electric field.
Download or read book National Union Catalog written by and published by . This book was released on 1981 with total page 1032 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes entries for maps and atlases.
Download or read book Directory of Graduate Research written by American Chemical Society. Committee on Professional Training and published by . This book was released on 1979 with total page 1030 pages. Available in PDF, EPUB and Kindle. Book excerpt:
