UR1268 Biopolymères Interactions Assemblages, INRA, équipe Interfaces et Systèmes Dispersés, F-44316 Nantes, France.
Langmuir. 2010 Jul 6;26(13):11397-400. doi: 10.1021/la100885e.
It is presently shown that long chain (C14, C16, and C18) alkanoic (saturated fatty) acids can form magnetically oriented hexagonal phases in aqueous concentrated solutions in mixtures with tetrabutylammonium (TBAOH) as the counterion. The hexagonal phase occurred for a molar ratio, alkanoic acid/TBAOH, higher than 1, i.e., for an excess of fatty acid. The hexagonal phase melted to an isotropic phase (micelles) upon heating at a given temperature depending on the alkyl chain length. The self-orientation of the hexagonal phase occurred upon cooling from the "high-temperature" isotropic phase within the magnetic field. The long axis of the hexagonal phase was shown to self-orient parallel to the magnetic field as evidenced by deuterium solid-state NMR. This finding is expected to be of interest in the field of structural biology and materials chemistry for the synthesis of oriented materials.
目前已经表明，长链（C14、C16 和 C18）烷酸（饱和脂肪酸）可以在与四丁基氢氧化铵（TBAOH）作为抗衡离子的混合水溶液中形成具有磁各向异性的六角相。对于摩尔比，烷酸/TBAOH，大于 1，即脂肪酸过量，出现六角相。在给定温度下加热时，六角相熔化成各向同性相（胶束），这取决于烷基链的长度。在磁场中从“高温”各向同性相冷却时，会发生六角相的自取向。通过氘固态 NMR 证实，六角相的长轴平行于磁场自取向。这一发现有望在结构生物学和材料化学领域引起关注，用于合成各向异性材料。
