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Effects of Solubilized Hydrocarbons on the Structure and the Dislocation Pattern in a Lamellar Liquid Crystal

1979; Volume: 53; Issue: 3-4 Linguagem: Inglês

10.1080/00268947908083995

0026-8941

Nadim Moucharafieh, Stig E. Frlberg, David W. Larsen,

Material Dynamics and Properties

Abstract The structure and dislocation pattern in a lamellar liquid crystal from water and polyoxyethylene dodecyl ether were studied for the effects of solubilization of large amounts of hydrocarbon using low angle X-ray diffraction and optical microscopy. The X-ray data showed extremely small changes of interlayer spacings with added aromatic hydrocarbons indicating them to be located within the amphiphilic layer of surfactant and water. Addition of the aliphatic hydrocarbon gave an increase of the lamellar distance equal to or even in excess of the one for non-penetrative addition indicating a change in the direction of the amphiphilic substances. The lamellar liquid crystal containing only water and surfactant showed a pattern of enhanced presence of focal conic dislocations with increased surfactant concentration for tetraoxyethylene dodecyl ether. For pentaoxyethylene dodecyl ether with a hydrophilic character this trend was observed after enhancing the lipophilic part by addition of hydrocarbon.