Liquid crystals in a fused salt: .beta.,.gamma.-distearoylphosphatidylcholine in N-ethylammonium nitrate

Abstract

The formation of liquid crystals of P,y-distearoylphosphotidylcholine (DSPC) in N-ethylammonium nitrate, a low-melting fused salt, has been documented with polarizing microscopy and small-angle X-ray scattering.The Lr -P, -L, transitions with increasing temperature are present in analogy with the behavior of DSPC in water. For a 1:l (by weight) mixture the d spacing for the L, phase is 63 8, and the surfactant head group area is 76 A2.

Thermodynamic properties of micellization of sodium dodecyl sulfate in binary mixtures of ethylene glycol with water

“…Evans and co-workers (19) have indicated that the ability of a solvent to form hydrogen bonds is a necessary condition of micelle formation. However, it has been shown in the literature that the unique structure of water (H-bonding) is not a necessary condition for the aggregation process (23)(24)(25)(26). Micelle formation has been reported in solvents such as acetone, acetonitrile, and dimethyl sulfoxide (18,27,28) where there is very little or no hydrogen bonding.…”

Various Self-Assembly Behaviors of Amphiphilic Molecules in Ionic Liquids

“…In 1983, Evans et al investigated that β,γ-distearoylphosphotidylcholine (DSPC) can form liquid crystals in EAN by polarized microscopy and SAXS [56]. The L β' → P β' → L α , transitions with increasing temperature are present in analogy with the behavior of DSPC in water.…”

Aggregates in Ionic Liquids and Applications Thereof

“…Evans and co-workers first reported the aggregation behavior of alkyltrimethylammonium bromides, alkylpyridiniums bromides and Triton X-100 in ethyl ammonium nitrate (Evans et al, 1982;Evans et al, 1983). More recently, premicellar aggregation in 1-butyl-3-methylimidazolium chloride and hexafluorophosphate was detected using inverse gas chromatography (Anderson et al, 2003).…”

“…(Dupont et al, 2002;Ranke et al, 2007) Lastly, corresponding to structured polar medium, RTILs can be also exploited to investigate molecular aggregation. Some authors have described in the past few years the ability of ILs to form various aggregates such as micelles, (Patrascu et al, 2006;Gayet et al, 2010b) vesicles, (Kimizuka and Nakashima, 2001;Nakashima and Kimizuka, 2002;Hao et al, 2005;Gayet et al, 2010a) non aqueous microemulsions (Gao et al, 2004;Eastoe et al, 2005;Gayet et al, 2009) or lyotropic phases (Evans et al, 1983;Wang et al, 2004;Araos and Warr, 2005). This gives access to new applications in green chemistry and opens new research directions towards micellar catalysis in IL media, solvatation enhancement for apolar entities, biocatalysis, nanomaterials synthesis, etc.…”