Super-efficient surfactant for stabilizing water-in-carbon dioxide microemulsions.
Super-efficient surfactant for stabilizing water-in-carbon dioxide microemulsions.
复制标题
DOI：
10.1021/la104990c
复制
发表时间：
2011-04
期刊：
影响因子：
--
通讯作者：
Masanobu Sagisaka;Shuho Iwama;S. Hasegawa;A. Yoshizawa;A. Mohamed;Stephen Cummings;S. Rogers;R. Heenan;J. Eastoe
中科院分区：
文献类型：
--
作者：
Masanobu Sagisaka;Shuho Iwama;S. Hasegawa;A. Yoshizawa;A. Mohamed;Stephen Cummings;S. Rogers;R. Heenan;J. Eastoe
研究了含氟双尾戊二酸盐阴离子表面活性剂1，5-双[（1H，1H，2 H，2 H-全氟癸基）氧基]-1，5-二氧戊环-2-磺酸钠（8 FG（EO）（2））在高水/表面活性剂摩尔比（W（0））下对超临界CO2微乳液的稳定作用。研究在这里进行，以获得详细的信息，通过使用高压紫外可见染料探针和小角中子散射（SANS）测量的微乳液的相稳定性和纳米结构。用甲基橙子作为报告染料的紫外-可见光谱表明在45和75 °C下最大可达到的W（0）为60，并且SANS曲线表明规则的液滴溶胀，其中水核纳米液滴半径与W（0）之间具有线性关系。这代表了迄今为止报道的任何CO（2）包水微乳液的最高水增溶。SANS数据的进一步分析表明，8 FG（EO）（2）在微乳液界面处的临界填充参数>1.34，约为同等条件下庚烷包水微乳液中常见气溶胶-OT值的1.1倍。
The fluorinated double-tailed glutarate anionic surfactant, sodium 1,5-bis[(1H,1H,2H,2H-perfluorodecyl)oxy]-1,5-dioxopentane-2-sulfonate (8FG(EO)(2)), was found to stabilize water-in-supercritical CO(2) microemulsions with high water-to-surfactant molar ratios (W(0)). Studies were carried out here to obtain detailed information on the phase stability and nanostructure of the microemulsions by using a high-pressure UV-vis dye probe and small-angle neutron scattering (SANS) measurements. The UV-vis spectra, with methyl orange as a reporter dye, indicated a maximum attainable W(0) of 60 at 45 and 75 °C, and SANS profiles indicated regular droplet swelling with a linear relationship between the water core nanodroplet radius and W(0). This represents the highest water solubilization reported to date for any water-in-CO(2) microemulsion. Further analysis of the SANS data indicated critical packing parameters for 8FG(EO)(2) at the microemulsion interface >1.34, representing approximately 1.1 times the value for common aerosol-OT in water-in-heptane microemulsions under equivalent conditions.