Changes in Phase Behavior from the Substitution of Ethylene Oxide with Carbon Dioxide in the Head Group of Nonionic Surfactants.,ChemSusChem

当前位置： X-MOL 学术 › ChemSusChem › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Changes in Phase Behavior from the Substitution of Ethylene Oxide with Carbon Dioxide in the Head Group of Nonionic Surfactants.
ChemSusChem ( IF 7.5 ) Pub Date : 2019-12-30 , DOI: 10.1002/cssc.201902855
Vivian J Spiering ₁ , Aurora Ciapetti ₁ , Michelle Tupinamba Lima ₂ , Dominic W Hayward ₁ , Laurence Noirez ₃ , Marie-Sousai Appavou ₄ , Reinhard Schomäcker ₂ , Michael Gradzielski ₁

Affiliation

Nonionic ethylene oxide (EO)-based surfactants are widely employed in commercial applications and normally form gel-like liquid crystalline phases at higher concentrations, rendering their handling under such conditions difficult. By incorporating CO2 units in their hydrophilic head groups, the consumption of the petrochemical EO was reduced, and the tendency to form liquid crystals was suppressed completely. This surprising behavior was characterized by rheology and studied with respect to its structural origin by means of small-angle neutron scattering (SANS). These experiments showed a strongly reduced repulsive interaction between the micellar aggregates, attributed to a reduced hydration and enhanced interpenetration of the head groups owing to the presence of the CO2 units. In addition, with increasing CO2 content the surfactants became more efficient and effective with respect to their surface activity. These findings are important because the renewable resource CO2 is used, and the CO2 -containing surfactants allow handling at very high concentrations, an aspect of enormous practical importance.

中文翻译：

非离子表面活性剂头基中环氧乙烷被二氧化碳取代导致相行为的变化。

基于非离子环氧乙烷（EO）的表面活性剂广泛用于商业应用，通常在较高浓度下形成凝胶状液晶相，使得它们在这种条件下的处理变得困难。通过在其亲水性头基中引入CO2单元，减少了石化EO的消耗，并完全抑制了形成液晶的趋势。这种令人惊讶的行为以流变学为特征，并通过小角中子散射（SANS）对其结构起源进行了研究。这些实验表明，胶束聚集体之间的排斥相互作用大大减少，这是由于 CO2 单元的存在导致水合作用减少和头部基团的相互渗透增强。此外，随着二氧化碳含量的增加，表面活性剂的表面活性变得更加高效和有效。这些发现很重要，因为使用了可再生资源二氧化碳，并且含二氧化碳表面活性剂允许以非常高的浓度进行处理，这是具有巨大实际重要性的一个方面。

更新日期：2019-12-30

点击分享查看原文

点击收藏

公开下载

阅读更多本刊新发论文本刊介绍/投稿指南