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Saturday, July 25, 2020 | History

2 edition of influence of additives on lyotropic dye/water liquid crystals. found in the catalog.

influence of additives on lyotropic dye/water liquid crystals.

Andrew Paul Ormerod

influence of additives on lyotropic dye/water liquid crystals.

by Andrew Paul Ormerod

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Published by University of Salford in Salford .
Written in English


Edition Notes

MSc thesis, Chemistry.

ID Numbers
Open LibraryOL21515665M

Liquid crystals (LCs) are a state of matter which has properties between those of conventional liquids and those of solid instance, a liquid crystal may flow like a liquid, but its molecules may be oriented in a crystal-like way. There are many different types of liquid-crystal phases, which can be distinguished by their different optical properties (such as textures). The alignment of lyotropic liquid crystals in a magnetic field has been studied by line shape analysis of the T-1 process and 2D H-2 double quantum filtered (DQF) NMR to investigate water .

Abstract. Using a magnetic Frederiks transition technique, we measure the temperature and concentration dependences of splay K 1, twist K 2, and bend K 3 elastic constants for the lyotropic chromonic liquid crystal sunset yellow formed through noncovalent reversible aggregation of organic molecules in water. K 1 and K 3 are comparable to each other and are Cited by:   Crystals vs Liquid Crystals o A crystal is a highly ordered structure which possesses long-range positional & orientational order o For many substances these two types of order are destroyed simultaneously when the crystal melts to form a liquid o For some substances, these orders are destroyed in stages.

Introduction to Liquid Crystals The study of liquid crystals began in when an Austrian botanist named Friedrich Reinitzer observed that a material known as cholesteryl benzoate had two distinct melting points. In his experiments, Reinitzer increased the temperature of a solid sample and watched the crystal change into a hazy liquid. Lyotropic liquid crystal is part of the WikiProject Biology, an effort to build a comprehensive and detailed guide to biology on Wikipedia. Leave messages on the WikiProject talk page. C This article has been rated as C-Class on the project's quality scale. Mid This article has been rated as Mid-importance on the project's importance scale.


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Influence of additives on lyotropic dye/water liquid crystals by Andrew Paul Ormerod Download PDF EPUB FB2

We report an experimental study of the influence of lyotropic liquid crystalline phases on the ability of antibodies to bind to protein antigens immobilized on surfaces when the antibodies are delivered and bind to the antigens from the lyotropic liquid crystals (LCs).

The LCs were prepared from anionic amphiphiles (sodium decyl sulfate (SDeS), cesium Cited by: The azo dye, sunset yellow, is a prototypical, chromonic liquid crystal in which assembly in aqueous solution at high volume fraction leads to lyotropic. Lyotropic Liquid Crystals Lyotropic LCs [ 8, 9 ] on the other hand are observed when changing the concentration of a shape- or property anisotropic dispersant in an isotropic solvent.

Often, lyotropic phases are observed as a function of concentration of amphiphilic molecules in water or other solvents, as schematically shown in Figure by: Lyotropic chromonic liquid crystals (LCLCs) are formed by molecules with ionic groups at the periphery that associate into stacks through noncovalent self-assembly while in water.

The very existence of the nematic (N) phase in the typical LCLC, the dye Sunset Yellow (SSY) is a puzzle, as the correlation length associated with the stacking, as measured in the X-ray experiments. E.S. Blackmore, G.J.T. TiddyPhase behaviour and lyotropic liquid crystals in cationic surfactant–water systems J.

Chem. Soc Faraday Trans. In ternary water−oil−nonionic alkyl polyglycol ether (CiEj) microemulsions, an increase in efficiency is always accompanied by the formation of a lamellar (Lα) phase.

The addition of an amphiphilic block copolymer to the ternary base system increases the efficiency of the microemulsion drastically while suppressingat least partlythe formation of the Lα by: Lyotropic chromonic liquid crystals (LCLCs) are formed by molecules with ionic groups at the periphery that associate into stacks through noncovalent self-assembly while in water.

The very existence of the nematic (N) phase in the typical LCLC, the dye Sunset Yellow (SSY) is a puzzle, as the correlation length associated with the stacking, as measured in the X-ray experiments, Cited by: Liquid-crystal polymers include the lyotropic liquid-crystal type and the thermotropic liquid-crystal type.

Pioneering studies on the latter were carried out by Economy 1 of Carborundum Co., Jackson 2 of Eastman Kodak and Calundann 3 of Hoechst–Celanese, together with their collaborators, and some of the polymers are now commercially available as resins.

Tiddy GJT () Surfactant-Water Liquid Crystal Phases. Physics Porte G () Extreme Swelling of a Lyotropic Lamellar Liquid Crystal. Colloid Polym Sci – CrossRef Google Scholar. Verwey EJW, Overbeek JTG () Theory of Stability of Lyophobic Colloids.

Charvolin J () Lyotropic Liquid Crystals, Structures and Cited by: Two kinds of carbon materials,i.e., graphene and graphene oxide (GO), were successfully incorporated into a lyotropic liquid crystal (LLC) matrix formed by n-dodecyl tetraethylene monoether (C12E4). Lyotropic liquid crystals are formed on the dissolution of most surfactants in water, and are more common than micellar solutions.

Four major varieties of phase structures are known, these being hexagonal, lamellar, reversed hexagonal and cubic.

The molecular arrangements within the first three are well by: Introduction to liquid Journal of Molecular Liquids () – Many excellent books and reviews cover different aspects of liq- Lyotropic liquid : Denis Andrienko.

both thermotropic and lyotropic liquid crystalline tran-sitions, i.e. mesomorphism. Liquid crystals are typically organic molecules, ranging from polyelectrolytes (e.g.

DNA, vegetable gums, etc.) to small molecules (mem-brane lipids, detergents, etc.), in the presence of (some-times aromatic) hydrocarbon “oils” and water.

Other. Lyotropic chromonic liquid crystals (LCLCs) form through the process of reversible self- In water, the molecules stack on top of each other forming the so-called H-aggregates, leaving the polar solubilizing groups at the aggregate-water interface [].

neutral additives can influence the system at two different levels: at the level of. A liquid crystalline mesophase is called lyotropic (a portmanteau of lyo-"dissolve" and -tropic "change") if formed by dissolving an amphiphilic mesogen in a suitable solvent, under appropriate conditions of concentration, temperature and pressure.

A mixture of soap and water is an everyday example of a lyotropic liquid crystal. Historically, the term was used to describe.

This paper is a brief review of some of the properties and applications of liquid crystals. References will guide the reader to more extensive presentations. Molecular geometry is important in interpreting the properties of liquid crystals.

Certain aspects of molecular geometry are discussed along with classification of the different types of liquid by: 8. Here we investigate these evaporation dynamics and morphology with a model liquid crystal, the dye Sunset Yellow FCF (SSY) in water, whose equilibrium phase behaviour and viscoelastic properties Cited by:   A lyotropic liquid crystal in the isotropic phase does not change the polarization of light.

But the propagation of a mechanical wave induces a temporary order, which changes the polarization of. Early investigations of lyotropic liquid crystals formed by a surfactant, a long chain alcohol and water are summarized by Ekwall. Friberg et al. [12] have shown that in the ternary long chain alcohol/sodium dodecylsulfate (SDS)/water system a broad range of a lamellar liquid crystalline phase (L α -phase) by: This text relies on only introductory level physics and chemistry as the foundation for understanding liquid crystal science.

Liquid crystals combine the material properties of solids with the flow properties of fluids. As such they have provided the foundation for a revolution in low- power, flat-panel display technology LCDs. In this book, the essential elements of liquid crystal /5(2). This book reviews comprehensively the technological, scientific, artistic and medical applications of liquid crystals.

It starts with the basics of liquid crystals and covers electro-optical, thermo-optical, colour, polymeric, lyotropic, and scientific applications of liquid crystalline materials.2/5(1).The bicontinuous cubic (Q) lyotropic liquid crystal (LLC) phases formed by the phase-separation and self-organization of amphiphilic molecules in water .Inabout compounds forming liquid crystalline phases were known; bythis number had increased to about 50 In portable devices like wristwatches, pocket caculators, measuring instruments, and laptop computers the liquid crystal display technology has gained total acceptance and is on the way to encompass the market of colour TV screens.