1996
DOI: 10.1007/bf00653064
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Phase diagrams and phase structures of identical and mixed chain lithium di-n-alkyl phosphate-water binary systems. Asymmetric molecular shape effect

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Cited by 6 publications
(5 citation statements)
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“…This suggests that the amphiphiles are able to associate water molecules out to a distance of at least 1.5 nm from the "edge" of the micellar aggregates. 31 P NMR spectroscopy has been used to identify the structure of LLC phases formed from natural 17,18 and unnatural phospholipids, 19,20 di-n-alkyl phosphates, 21 and classical ammonium surfactants with phosphate counterions. 22 The 31 P NMR behavior of one of the phosphonium salts, C14TMPB, was investigated in order to explore the potential utility of this method for characterizing our LLC phases.…”
Section: Resultsmentioning
confidence: 99%
“…This suggests that the amphiphiles are able to associate water molecules out to a distance of at least 1.5 nm from the "edge" of the micellar aggregates. 31 P NMR spectroscopy has been used to identify the structure of LLC phases formed from natural 17,18 and unnatural phospholipids, 19,20 di-n-alkyl phosphates, 21 and classical ammonium surfactants with phosphate counterions. 22 The 31 P NMR behavior of one of the phosphonium salts, C14TMPB, was investigated in order to explore the potential utility of this method for characterizing our LLC phases.…”
Section: Resultsmentioning
confidence: 99%
“…This value is much smaller than that (30.8 Å ́) calculated using Tanford's equation (l max = 1.5 + 1.265n m , where l max is the maximum length of the hydrocarbon chain, and n m is the number of CH 2 groups in the chain). 43 The difference in the two values may be accounted for by invoking a closely packed model 44 in which the two surfactant molecules combine alternatively with each other to form the lamellar structures. We may now assume that the lamellar structures gave rise to a further decrease in the number of hydrating water molecules (compared with that in the thread-like micelles), causing a greater hardening of the highly organized aggregates.…”
Section: The Journal Of Physical Chemistry Bmentioning
confidence: 99%
“…For asymmetric surfactants, in which one of the two hydrocarbon chains is shorter, interdigitation of the chains may contribute to such a smaller thickness in the lamellar. However, considering the fact that the all-trans chain effect of ndecyl chains upon aggregation is larger than that of n-cetyl chains, 24,43 the interdigitation effect on the lamellar thickness of HCeP may be greater than that for HDeP.…”
Section: ■ Results and Discussionmentioning
confidence: 99%
“…b These values are characteristics of a lamellar and were indexed to (001), (002), and (003), respectively. Two models of type A (a closely packed model) 31,43 and type B (a loosely packed model) 31,43 were introduced to explain the thickness 17.5 Å. In type A, the two alkyl chains forming a bilayer are closely packed in a manner which alternatively combines short and long n-alkyl chains (Figure 9a).…”
Section: ■ Results and Discussionmentioning
confidence: 99%