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Interfacial interactions between oleic acid and betaine molecules at decane-water interface: A study of dilational rheology
Journal of Molecular Liquids ( IF 6 ) Pub Date : 2020-07-10 , DOI: 10.1016/j.molliq.2020.113784
Huan-Quan Sun , Zhao-Yang Guo , Xu-Long Cao , Yang-Wen Zhu , Bin-Lin Pan , Miao Liu , Lei Zhang , Lu Zhang

The interfacial interactions between organic acid and betaine molecules play an important role in reducing interfacial tension (IFT). To deeply detect the arrangements of organic acid and betaine molecules at the interface, the dilational rheological properties of mixed adsorption films formed by oleic acid and octadecyl carboxyl betaine (18PC) or octadecyl sulfobetaine (18PS) were investigated using drop shape analysis method at the decane-water interface. The influences of aging time, oscillation frequency and surfactants concentration were detected. The experimental results show that the properties of 18PC and 18PS adsorption film are controlled by both the fast diffusion-exchange process between the bulk and the interface and the slow re-arrangement process in the interface. 18PC film is tighter than that of 18PS because the size of carboxyl is small than sulfonyl. Oleic acid and betaine surfactants can form mixed adsorption films with less strength caused by the rapid transfer of oleic acid between the bulk and the interface, but more elastic due to the enhancement of the intermolecular interaction. In this case, the oleic acid molecules are easier to insert into the spaces between 18PS molecules on the interface, which results in a more tight mixed film than oleic acid/18PC film.



中文翻译:

癸烷-水界面上油酸与甜菜碱分子之间的界面相互作用:膨胀流变学研究

有机酸和甜菜碱分子之间的界面相互作用在降低界面张力(IFT)中起着重要作用。为了深入检测界面上有机酸和甜菜碱分子的排列,在癸烷上使用液滴形状分析方法研究了油酸和十八烷基羧基甜菜碱(18PC)或十八烷基磺基甜菜碱(18PS)形成的混合吸附膜的膨胀流变性能。 -水界面。考察了老化时间,振荡频率和表面活性剂浓度的影响。实验结果表明,18PC和18PS吸附膜的性能受本体与界面之间的快速扩散交换过程和界面中缓慢的重排过程控制。18PC膜比18PS膜更紧密,因为羧基的尺寸比磺酰基小。油酸和甜菜碱表面活性剂可以形成混合的吸附膜,其强度较低,这是由于油酸在本体和界面之间的快速转移引起的,但由于分子间相互作用的增强,弹性更大。在这种情况下,油酸分子更容易插入界面上18PS分子之间的空间中,与油酸/ 18PC膜相比,混合膜更紧密。

更新日期:2020-07-30
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