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Assembly of small molecule surfactants at highly dynamic air–water interfaces
Soft Matter ( IF 2.9 ) Pub Date : 2017-11-10 00:00:00 , DOI: 10.1039/c7sm01914a Omar T. Mansour 1, 2, 3, 4, 5 , Beatrice Cattoz 1, 2, 3, 4, 5 , Manon Beaube 1, 2, 3, 4, 5 , Morganne Montagnon 1, 2, 3, 4, 5 , Richard K. Heenan 6, 7, 8, 9 , Ralf Schweins 10, 11, 12, 13, 14 , Marie-Sousai Appavou 15, 16, 17, 18, 19 , Peter C. Griffiths 1, 2, 3, 4, 5
Soft Matter ( IF 2.9 ) Pub Date : 2017-11-10 00:00:00 , DOI: 10.1039/c7sm01914a Omar T. Mansour 1, 2, 3, 4, 5 , Beatrice Cattoz 1, 2, 3, 4, 5 , Manon Beaube 1, 2, 3, 4, 5 , Morganne Montagnon 1, 2, 3, 4, 5 , Richard K. Heenan 6, 7, 8, 9 , Ralf Schweins 10, 11, 12, 13, 14 , Marie-Sousai Appavou 15, 16, 17, 18, 19 , Peter C. Griffiths 1, 2, 3, 4, 5
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Small-angle neutron scattering has been used to probe the interfacial structure of foams stabilised by small molecule surfactants at concentrations well below their critical micelle concentration. The data for wet foams showed a pronounced Q−4 dependence at low Q and noticeable inflexions over the mid Q range. These features were found to be dependent on the surfactant structure (mainly the alkyl chain length) with various inflexions across the measured Q range as a function of the chain length but independent of factors such as concentration and foam age/height. By contrast, foam stability (for C < CMC) was significantly different at this experimental range. Drained foams showed different yet equally characteristic features, including additional peaks attributed to the formation of classical micellar structures. Together, these features suggest the dynamic air–water interface is not as simple as often depicted, indeed the data have been successfully described by a model consisting paracrystalline stacks (multilayer) of adsorbed surfactant layers; a structure that we believe is induced by the dynamic nature of the air–water interface in a foam.
中文翻译：
小分子表面活性剂在高度动态的空气-水界面处的组装
小角中子散射已用于探测由小分子表面活性剂稳定的泡沫的界面结构，其浓度远低于其临界胶束浓度。湿泡沫的数据显示出在低Q时明显的Q -4依赖性，在中Q范围内出现明显的弯曲。发现这些特征取决于表面活性剂的结构（主要是烷基链长），在测得的Q值上有各种弯曲范围取决于链长，但不受浓度和泡沫年龄/高度等因素的影响。相比之下，在此实验范围内，泡沫稳定性（对于C <CMC）显着不同。排干的泡沫显示出不同但均等的特征，包括归因于经典胶束结构形成的其他峰。总之，这些特征表明动态的空气-水界面并不像通常所描绘的那样简单，实际上，数据已成功地由吸附表面活性剂层的多晶叠层（多层）组成的模型描述。我们认为，这种结构是由泡沫中空气-水界面的动态特性引起的。
更新日期：2017-11-15
中文翻译：
小分子表面活性剂在高度动态的空气-水界面处的组装
小角中子散射已用于探测由小分子表面活性剂稳定的泡沫的界面结构，其浓度远低于其临界胶束浓度。湿泡沫的数据显示出在低Q时明显的Q -4依赖性，在中Q范围内出现明显的弯曲。发现这些特征取决于表面活性剂的结构（主要是烷基链长），在测得的Q值上有各种弯曲范围取决于链长，但不受浓度和泡沫年龄/高度等因素的影响。相比之下，在此实验范围内，泡沫稳定性（对于C <CMC）显着不同。排干的泡沫显示出不同但均等的特征，包括归因于经典胶束结构形成的其他峰。总之，这些特征表明动态的空气-水界面并不像通常所描绘的那样简单，实际上，数据已成功地由吸附表面活性剂层的多晶叠层（多层）组成的模型描述。我们认为，这种结构是由泡沫中空气-水界面的动态特性引起的。
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