饱和微胶囊网络:相分离和纳米乳化能力

Tatiana G. Slavova, Gergana M. Radulova, K. Danov
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引用次数: 0

摘要

不同的油类可以均匀地分散在分离的双连续胶束相的网络交界处。稀释后,这些分散体会自发形成纳米乳液。研究了在二价和一价盐存在下,三种阴离子和两种齐聚物表面活性剂混合物形成胶束海绵相的可能性。使用带有 1 个环氧乙烷基团的月桂醇醚硫酸钠(SLES-1EO)和椰油酰胺丙基甜菜碱(CAPB)或 N,N-二甲基十二烷基胺 N-氧化物(DDAO),并加入适量的氯化镁和氯化钙,可获得最佳效果。在高盐度的氯化钠溶液中也能产生双连续胶束相。这些相的体积特性与从中分离出来的初始溶液的浓度无关,其牛顿粘度在 0.3 Pa-s 至 0.8 Pa-s 之间。含 8 wt% CAPB 和 DDAO 的海绵相均可吞噬高达 10 wt% 的柠檬烯,并在稀释后自发形成纳米乳液,液滴大小为 110-120 nm。维生素 E 只能均匀地分散在含 CAPB 的饱和胶束网络中,稀释后,这些分散液会自发形成纳米乳液,对于维生素 E 的 8 种非对映异构体和 2 种非对映异构体混合物,液滴尺寸均较小,为 66 nm。
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Saturated Micellar Networks: Phase Separation and Nanoemulsification Capacity
Different oils can be homogeneously dispersed in the network junctions of the separated bicontinuous micellar phases. Upon dilution, these dispersions spontaneously form nanoemulsions. The possibility of a micellar sponge phase formation in the case of mixtures with three anionic and two zwitterionic surfactants in the presence of divalent and monovalent salts is studied. The best results are obtained using sodium lauryl ether sulfate with 1 ethylene oxide group (SLES-1EO) and both cocamidopropyl betaine (CAPB) or N,N-dimethyldodecylamine N-oxide (DDAO) in the presence of an appropriate small amount of MgCl2 and CaCl2. Bicontinuous micellar phases can be produced also in high-salinity NaCl solutions. The bulk properties of these phases are independent of the concentration of the initial solutions from which they are separated, and their Newtonian viscosities are in the range from 0.3 Pa·s to 0.8 Pa·s. Both 8 wt% CAPB- and DDAO-containing sponge phases engulf up to 10 wt% limonene and spontaneously form nanoemulsion upon dilution with droplet sizes of 110–120 nm. Vitamin E can be homogeneously dispersed only in CAPB-containing saturated micellar network, and upon dilution, these dispersions spontaneously form nanoemulsions with smaller droplet sizes of 66 nm for both 8 diastereomers and 2 diastereomers mixtures of vitamin E.
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