Low fluorine content CO2-philic surfactants.
Low fluorine content CO2-philic surfactants.
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DOI：
10.1021/la2021885
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发表时间：
2011-08
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影响因子：
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通讯作者：
A. Mohamed;Masanobu Sagisaka;F. Guittard;Stephen Cummings;A. Paul;S. Rogers;R. Heenan;R. Dyer;J. Eastoe
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文献类型：
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作者：
A. Mohamed;Masanobu Sagisaka;F. Guittard;Stephen Cummings;A. Paul;S. Rogers;R. Heenan;R. Dyer;J. Eastoe
本文解决了 CO(2) 科学技术领域中一个重要且尚未解决的问题：获得亲 CO(2) 表面活性剂所需的最低氟含量是多少？先前的出版物 (Langmuir 2002, 18, 3014) 建议应该有一个理想的氟化水平：为了优化 CO(2) 中可能的工艺应用，重要的是确定需要多少 F 才能使表面活性剂具有亲 CO(2) 特性。在这里，通过对基于双链磺基琥珀酸盐的亲CO(2)亲表面活性剂设计的系统研究，确定了CO(2)包水(w/c)微乳液稳定的最佳化学结构。 CO(2) 中反胶束形成的高压小角中子散射 (HP-SANS) 测量表明，任何给定表面活性剂的 F 含量与 CO(2) 相容性之间存在明确的关系。有趣的是，高氟含量表面活性剂具有较低的极限水表面张力 γ(cmc)，在 CO(2) 中也具有更好的性能，如较低的浊点压力 P(trans) 所示。该结果对于亲 CO(2) 表面活性剂的合理设计具有重要意义，有助于为新兴的基于 CO(2) 的流体技术确定最经济、最有效的化合物。
The article addresses an important, and still unresolved question in the field of CO(2) science and technology: what is the minimum fluorine content necessary to obtain a CO(2)-philic surfactant? A previous publication (Langmuir 2002, 18, 3014) suggested there should be an ideal fluorination level: for optimization of possible process applications in CO(2), it is important to establish just how little F is needed to render a surfactant CO(2)-philic. Here, optimum chemical structures for water-in-CO(2) (w/c) microemulsion stabilization are identified through a systematic study of CO(2)-philic surfactant design based on dichain sulfosuccinates. High pressure small-angle neutron scattering (HP-SANS) measurements of reversed micelle formation in CO(2) show a clear relationship between F content and CO(2) compatibility of any given surfactant. Interestingly, high F content surfactants, having lower limiting aqueous surface tensions, γ(cmc), also have better performance in CO(2), as indicated by lower cloud point pressures, P(trans). The results have important implications for the rational design of CO(2)-philic surfactants helping to identify the most economic and efficient compounds for emerging CO(2) based fluid technologies.