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Studies in membrane processes. IX. The bilayer structure in mixed dodecanoate/decyltrimethylammonium micelles of a novel type II mesophase

Lee, Yunko and Reeves, Leonard W. and Tracey, Alan S. (1980) Studies in membrane processes. IX. The bilayer structure in mixed dodecanoate/decyltrimethylammonium micelles of a novel type II mesophase. Canadian Journal of Chemistry, 58 (2). pp. 110-123. ISSN 0008-4042. http://resolver.caltech.edu/CaltechAUTHORS:20120724-143911835

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Abstract

Nematic lyotropic liquid crystalline materials, which spontaneously align in a magnetic field (Type II) have been prepared from a mixed detergent system consisting of potassium dodecanoate and decyltrimethylammonium bromide. This system has an advantage that the charge on the interface of the finite disc micelles can be readily varied. Sodium and bromide ion interactions with the interface have been investigated by nuclear magnetic resonance of the ions. Deuterium magnetic resonance spectra of deuteriated water and specifically deuteriated detergent chains have been obtained. The results show that there is a water structure built around the carboxylate headgroups which ceases to be stable when about 30% of potassium dodecanoate is replaced by decyltrimethylammonium bromide. Bromine magnetic resonance studies show that the bromide ion interacts only weakly with carboxylate but indicates, as would be expected, much stronger interaction with the trimethylammonium groups. The sodium ion in contrast was found to bind strongly with carboxylate and weakly with trimethylammonium. The sodium spectra indicate that the association of sodium with carboxylate is complex, involving two specific binding sites. Deuterium spectra from deuteriated hydrocarbon chains are interpreted in terms of the motional freedom of the individual chains. The results re-emphasize that the motional properties of a particular hydrocarbon chain of an amphiphile in the micellar bilayer is determined to a large extent by its headgroup and that the behaviour of one chemical species cannot be inferred from that of another.


Item Type:Article
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http://dx.doi.org/10.1139/v80-018DOIUNSPECIFIED
http://www.nrcresearchpress.com/doi/abs/10.1139/v80-018PublisherUNSPECIFIED
Additional Information:© 1980 National Research Council of Canada. Conseil national de recherches du Canada. Received November 21, 1978. We are thankful to the National Research Council of Canada for its financial support of this work by operating grants to L.W.R.
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National Research Council of CanadaUNSPECIFIED
Record Number:CaltechAUTHORS:20120724-143911835
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20120724-143911835
Official Citation:Studies in membrane processes. IX. The bilayer structure in mixed dodecanoate/decyltrimethylammonium micelles of a novel type II mesophase Yunko Lee, Leonard W. Reeves, Alan S. Tracey Canadian Journal of Chemistry, 1980, 58(2): 110-123, 10.1139/v80-018
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:32686
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:24 Jul 2012 22:17
Last Modified:24 Jul 2012 22:17

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