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Topic: Columnar phase

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Liquid crystal

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	Columnar Pads -- Recommendations and Resources (Site not responding. Last check: 2007-10-30)
		The columnar phase is a class of liquid-crystalline phases in which molecules assemble into cylindrical structures to act as mesogens.
		Columnar liquid crystals are grouped by their structural order and the ways of packing of the columns.
		In this phase, molecules do not form specific columnar assemblies but only float with their short axes in parallel to the director (a unit vector which defines the liquid-crystalline alignment and order).
	www.becomingapediatrician.com /health/34/columnar-pads.html (663 words)

	e-Prints Soton - Modelling the chemically induced liquid crystalline phases in mixtures of disc-shaped mesogens: the ...
		The phase diagram of the pure system is determined over a range of pressures, and the phase sequence is shown to include tilted columnar and nematic phases.
		Cryst., 24, 229 (1998)] is not stable with respect to phase separation into an isotropic phase rich in a single component and a hexagonal columnar phase composed of roughly equal quantities of the two components.
		The structure of the columnar phase for the mixture is shown to be based on the alternate stacking of the different species.
	eprints.soton.ac.uk /19896 (370 words)

	research areas \| dit school of physics
		A columnar liquid crystal (see Figure 2) on the other hand consists of a periodic (usually triangular) array of liquid-like columns and is thus solid-like in two directions and liquid-like in one.
		A nematic phase (see Figure 3) is basically made up of rod-like molecules that have their long axes aligned along a common direction but in which the arrangement of their centres is random.
		The existence of such a phase is a dramatic illustration of the often unknown fact that a solid does not melt when long range order (and hence sharp x-ray scattering peaks) is lost, but rather when topological order is lost.
	physics.dit.ie /research/softcondmatt.html (1282 words)

	David van der Beek: Liquid crystal phase behaviour of colloidal platelets in external fields (Site not responding. Last check: 2007-10-30)
		In this thesis, the liquid crystal phase behaviour of colloidal platelets in external fields is studied.
		From the uniform Frederiks transition, we determine the bend elastic constant of the nematic phase.
		The order of the colour of the Bragg reflections of the columnar phase suggests size fractionation in the sediment, which is confirmed by SAXS measurements and electron microscopy.
	igitur-archive.library.uu.nl /dissertations/2005-0429-200034 (729 words)

	Discotic liquid crystals for optoelectronic properties (Site not responding. Last check: 2007-10-30)
		The mobility in columnar phases is strongly anisotropic and much larger along the columns as compared to perpendicular to them.
		One example is the formation of the plastic columnar phase characterized by a three-dimensional long range positional order and by molecules which rotate on the lattice points.
		Columnar Discotics in Confined Geometries, J.Kopitzke, J.H.Wendorff, Liq.
	www.chemie.uni-marburg.de /ag-wendorff/Forschung/F5-Diskoten_e.html (545 words)

	Colloidal Discs Trade their Order - ESRF (Site not responding. Last check: 2007-10-30)
		At the bottom a columnar phase yielding strong Bragg reflections of visible light can easily be identified (Figure 1a).
		In addition to the difference in the order parameters, the compressibility of the hexatic phase is also distinctly different from that of the multidomain (Figure 2a).
		N, C, and Hex denote, respectively, the nematic, the hexagonal columnar, and the new hexatic columnar phases.
	www.esrf.fr /NewsAndEvents/Spotlight/spotlight23order (617 words)

	The Nematic-Smectic Transition of Slightly Flexible Hard Rods (Site not responding. Last check: 2007-10-30)
		The phase behaviour of the particles, assumed to interact via a hard core repulsion, was investigated in a self-consistent field approximation.
		[1] In the smectic phase, flexibility influences both the angular distribution and the spatial density modulation of the rods.
		In conclusion, the apparent absence of smectic phases in solutions of (semi-)rigid polymers is not necessarily due to polydispersity effects.
	www.mpikg-golm.mpg.de /th/work/HardRods (449 words)

	Neoclassicism - Wikipedia, the free encyclopedia
		But a second neoclassic wave, more severe, more studied (through the medium of engravings) and more consciously archaeological, is associated with the height of the Napoleonic Empire.
		In France, the first phase of neoclassicism is expressed in the "Louis XVI style", the second phase in the styles we call "Directoire" or "Empire." Italy clung to Rococo until the Napoleonic regimes brought the new archeaological classicism, which was embraced as a political statement by young, progressive, urban Italians with republican leanings.
		Meanwhile, conservative modernist architects like Charles Perret in France kept the rhythms and spacing of columnar architecture even in factory buildings.
	en.wikipedia.org /wiki/Neoclassicism (1707 words)

	Session K1 - Physical Properties of DNA.
		The line hexatic phase is the three dimensional analog to the hexatic phase in two dimensions.
		At that point it is not yet clear whether this structure corresponds to a new phase located in between a columnar (non chiral) and cholesteric (chiral) arrangement of the DNA molecules.
		In the hexagonal columnar phase of chiral polymers a bias towards cholesteric twist competes with braiding along an average direction.
	flux.aps.org /meetings/YR97/BAPSMAR97/abs/S2610.html (428 words)

	LRSM, Research Accomplishments Physics
		Disc-shaped molecules with a rigid triphenylene core and flexible tails have been observed to form two-dimensional columnar phases with the molecules edge-on to the water surface; the tendency towards edge-on columnar structure is driven by the strong intermolecular
		We now present measurements of the azacrown derivative shown below at the air-water interface As the density is increased, the molecules undergo a phase transition from a face-on structure, with the alkyl tails extending away from the interface, to a thicker edge-on structure, with the tails extending radially away from the core.
		For each phase, we determine the evolution of the magnitude and direction of polarization in the crystal as a function of applied stress.
	www.lrsm.upenn.edu /lrsm/accompl7.html (3663 words)

	Trifunk TPs Text
		In light of the dramatically enhanced charge carrier mobility in the helical columnar phase, we became interested in the design and synthesis of triphenylene discotics possessing highly ordered phases.
		The phase behavior of these new mixed tail triphenylene discotics is summarized in Table 1.
		The assignment of phases as Dh was based on the similarity of optical textures to that of 1.
	www.csupomona.edu /~jarego/pages/TrifunkTP_text.html (1274 words)

	Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations
		Magnetic-field-induced nematic-columnar phase transition in aqueous suspensions of goethite ({alpha}-FeOOH) nanorods
		Interestingly, the nematic-columnar first-order transition can also be triggered by applying to the nematic phase a magnetic field of intensity decreasing with {phi} (1 T at 8.5%; 0.5 T at 12%).
		Single domains of the columnar phase were thus produced and their structure investigated by synchrotron x-ray scattering.
	www.osti.gov /energycitations/product.biblio.jsp?osti_id=20621612 (286 words)

	[No title]
		Zhang, R. Dong " 2H NMR angle-dependent spectral study of core dynamics in a discotic columnar phase", Phys.
		Orientational ordering and dynamics in the columnar phase of a discotic liquid crystal studied by deuteron NMR spectroscopy.
		A comparative study of dynamics in the nematic and reentrant-nematic phase of 60CB and 60CB/80CB mixture by deuteron nuclear magnetic resonace relaxation,'' Journcal of Chemical Physics.
	www.brandonu.ca /physics/dong_files/rdpublications.html (717 words)

	Mineralogy - LoveToKnow 1911 (Site not responding. Last check: 2007-10-30)
		It was not until the end of the 18th and beginning of the 19th century, when the foundations of crystallography were laid by Rome de l'Isle and R. Haiiy, and chemistry had assumed its modern phase, that any real advance was made in scientific mineralogy.
		It was then recognized that chemical composition and crystalline form were characters of the first importance, and that external (natural history) characters were often more or less accidental.
		marble), fibrous (asbestos), radio-fibrous or stellated (wavellite), columnar (beryl), laminar or lamellar (talc), bladed (cyanite), andc., according to the relative shape and sizes of the individual crystals composing the aggregate.
	www.1911ency.org /M/MI/MINERALOGY.htm (7255 words)

	PUBLICATIONS DE D. GUILLON (Site not responding. Last check: 2007-10-30)
		"The structures of the crystalline and columnar phases of rhodium (II) heptanoate and its binary mixture with copper (II) heptanoate probed by exafs"
		"Copper K-edge EXAFS spectroscopy of the crystalline and columnar phases of copper (II) carboxylates"
		"Investigation of the structures of the crystalline and columnar phases of linear-chain copper (II) alkanoates"
	www-ipcms.u-strasbg.fr /gmo/perso/guillon/guillon-publi.html (5065 words)

	Untitled Document
		From x-ray scattering, which probes the translational order, one may see a columnar phase disguised as a smectic phase.
		In an interesting off-shoot of our work we found that the discoveries which we made for disordered columnar liquid crystals are also relevant to ferromagnetic type II superconductors.
		It turns out that the elastic properties of this flux lattice are just like those of a columnar liquid crystal phase, more precisely it lies in the same universality class.
	www.calpoly.edu /~ksaunder/research/SaundersResearch.html (1245 words)

	Holistic Health Encyclopedia - S
		The Siskiyou essences include Solar and Lunar phase energies of the Pacific Northwest.
		the columnar assemblage of the vertebrae from the cranium through the coccyx; called also backbone, and spine.
		There are 24 spinal vertebrae (normally 7 cervical vertebrae in the neck, 12 dorsal or thoracic vertebrae in the upper and mid back, and 5 lumbar vertebrae in the lower back) in addition to the partly fused bones of the sacrum and coccyx.
	www.findhealer.com /glossary/S.php3 (8360 words)

	Table of contents for One- and two-dimensional fluids
		Table of contents for One- and two-dimensional fluids : physical properties of smectic, lamellar, and columnar liquid crystals / Antal Jãaakli and Alfred Saupe.
		Bibliographic record and links to related information available from the Library of Congress catalog.
		Contents may have variations from the printed book or be incomplete or contain other coding.
	www.loc.gov /catdir/toc/ecip064/2005035595.html (235 words)

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