Zielińska Katarzyna, Wilk Kazimiera A, Jezierski Adam, Jesionowski Teofil
Department of Chemistry, Wrocław University of Technology, Wrocław, Poland.
J Colloid Interface Sci. 2008 May 15;321(2):408-17. doi: 10.1016/j.jcis.2008.02.016. Epub 2008 Feb 15.
Significant efforts were undertaken to characterize the microstructure and structural properties of water-in-oil (w/o), oil-in-water (o/w), and bicontinuous (bc) microemulsions composed of N-alkyl-N-methylgluconamides (n-alkyl = n-C(12)H(25), n-C(14)H(29), n-C(16)H(33)) and n-alcohols (ethanol, n-propanol, n-butanol) or iso-alcohols (iso-propanol, iso-butanol) as cosurfactants, as well as iso-octane and water. The internal structure of so created four-component system was elucidated by means of an analysis of isotropic area magnitudes in phase diagrams and conductivity measurements. Dynamic light scattering (DLS) measurements provided the microemulsion size and polydispersity. Polarity and viscosity of microemulsion microenvironment were acquired by means of electron paramagnetic resonance (EPR), UV-vis absorption spectroscopy (in the case of w/o droplets), and steady-state fluorescence (SSF) (in the case of o/w droplets). The results show that both the surfactant and the cosurfactant types affect the shape and extent of microemulsions. The size of droplets depends strongly on the type of examined microemulsion and the type of cosurfactant (linear or brunched) but is almost independent of the length of the surfactant alkyl chain. The size of microemulsion droplets ranges from 8.1 to 22.6 nm and from 3.7 to 14.3 nm respectively, for o/w and o/w microemulsions, making them good candidates for both template-based reactions and household components solubilizing media.
人们付出了巨大努力来表征由N-烷基-N-甲基葡糖酰胺（正烷基 = 正-C(12)H(25)、正-C(14)H(29)、正-C(16)H(33)）和正醇（乙醇、正丙醇、正丁醇）或异醇（异丙醇、异丁醇）作为助表面活性剂，以及异辛烷和水组成的油包水（w/o）、水包油（o/w）和双连续（bc）微乳液的微观结构和结构性质。通过分析相图中的各向同性区域大小和电导率测量来阐明如此形成的四组分体系的内部结构。动态光散射（DLS）测量提供了微乳液的尺寸和多分散性。通过电子顺磁共振（EPR）、紫外可见吸收光谱（对于w/o液滴）和稳态荧光（SSF）（对于o/w液滴）获得微乳液微环境的极性和粘度。结果表明，表面活性剂和助表面活性剂的类型都会影响微乳液的形状和范围。液滴的大小强烈取决于所研究的微乳液类型和助表面活性剂的类型（直链或支链），但几乎与表面活性剂烷基链的长度无关。对于o/w和w/o微乳液，微乳液液滴的大小分别在8.1至22.6 nm和3.7至14.3 nm范围内，这使得它们成为基于模板的反应和家用成分增溶介质的良好候选者。
