Quantitative analysis of the packing of alkyl glycosides: a comparison of linear and branched alkyl chains

Alkyl-imidazolium glycosides: non-ionic—cationic hybrid surfactants from renewable resources

“…This substantially exceeds a value of below 40 Å 2 , reported for APG analog 7b and its homologs. 51,52 In fact, the value gets near the 63 Å 2 , found for octyl b-glucoside in a hexagonal lyotropic phase, 53 and is in line with the exclusive formation of curved assembly structures for sugar-based Y-shape surfactants, for, which similar molecular surface areas were reported. 54 It is assumed that the expansion of the hydrophilic domain by the hydrated imidazolium ion and repulsive charge interactions are responsible for the increased surface area and the related disappearance of the lamellar phase for the AIGs 6.…”

Thermotropic and lyotropic liquid crystalline phases of Guerbet branched-chain -D-glucosides

“…For certain Guerbet glycolipids, (e.g. maltoside with C 20 and C 24 ), a more complex polymorphism was observed, with an L α -Q -H II phase sequence [31,37]. Thermotropic polymorphism in amphitropic compounds such as glycolipids is rather uncommon, but has been previously observed in certain systems [38], and there are other branchedchain glycolipids whose behaviour has been extensively studied [38][39][40][41][42][43].…”

Carbohydrate liquid crystals: Synthesis and characterisation of the methyl-6-O-(n-acyl)-α-d-glucopyranosides

“…Establishing the empirical relationships between molecular structure and thermotropic phase behaviour has been at the centre of much of this research, although such materials also often exhibit lyotropic mesophases. Of particular interest has been the relationship between liquid crystalline behaviour and the length and structure of the alkyl chain or chains; for some recent examples see (Singh et al, 2008(Singh et al, , 2010Milkereit et al, 2005a,b,c;Nguan et al, 2010;Liao et al, 2006). In general, for short alkyl chains, liquid crystallinity is either not observed or is monotropic in nature.…”