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Comparative Study of Conventional/Ethoxylated/Extended n-Alkylsulfate Surfactants
Langmuir ( IF 3.7 ) Pub Date : 2019-02-13 00:00:00 , DOI: 10.1021/acs.langmuir.8b04022
Ji Chen 1 , Xue-yi Hu 1 , Yun Fang 1 , Huan-huan Liu 1 , Yong-mei Xia 1
Affiliation  

A series of novel anionic e-surfactants n-CcPpS was molecular designed and synthesized from long-chain fatty alcohols by polypropoxylation and sulfation followed by neutralization. Excellent all-round performance of extended surfactants (e-surfactants) interests us how a simple polypropylene oxide (PPO) spacer has great effects on properties. By a comparative study of conventional/ethoxylated/extended n-alkylsulfate surfactants, we were surprised to find that e-surfactants are in an obvious rugby shape at the air/water surface according to molecular surface area (am), and it comes down to the intramolecular PPO spacer coiling and surface-induced collapse. On the basis of the interfacial properties of the e-surfactants, it is found that the PPO spacer can provide both hydrophilic and lipophilic contributions to an e-surfactant molecule. The synergism between PPO spacers and alkyl chains indicates that a certain PPO spacer can adjust the contributions in view of different alkyl chain lengths. Therefore, it is both the rugby-shaped molecular geometry of e-surfactants and the dynamic amphipathicity of a PPO spacer that makes e-surfactants behave with excellent interfacial and solution properties for household cleaning. Therefore, this work gives us a hint that the molecular geometry of surfactants plays a vital role in interfacial and solution properties similar to molecular amphipathicity.

中文翻译:

常规/乙氧基/扩展烷基硫酸盐表面活性剂的比较研究

分子设计了一系列新型阴离子电子表面活性剂n -C c P p S,由长链脂肪醇通过聚丙氧基化和硫酸化然后中和而合成。扩展表面活性剂(电子表面活性剂)出色的全方位性能使我们感兴趣的是,简单的聚环氧丙烷(PPO)间隔物如何对性能产生重大影响。通过常规/乙氧基化/扩展进行了比较研究Ñ -alkylsulfate表面活性剂,我们惊奇地发现,电子表面活性剂是在空气/水表面的明显的橄榄球形状根据分子表面积(一个),然后下降到分子内PPO间隔物盘绕和表面诱导的塌陷。基于电子表面活性剂的界面性质,发现PPO间隔基可以为电子表面活性剂分子提供亲水和亲脂性贡献。PPO间隔基和烷基链之间的协同作用表明,鉴于不同的烷基链长度,某个PPO间隔基可以调节作用。因此,电子表面活性剂的橄榄球状分子几何形状和PPO间隔基的动态两亲性都使电子表面活性剂表现出出色的界面和溶液特性,可用于家庭清洁。因此,这项工作给我们一个暗示,即表面活性剂的分子几何形状在类似于分子两亲性的界面和溶液性质中起着至关重要的作用。
更新日期:2019-02-13
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