两性离子-离子表面活性剂混合物对界面水结构的协同作用（通过和频发生振动光谱法揭示）,Langmuir

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两性离子-离子表面活性剂混合物对界面水结构的协同作用（通过和频发生振动光谱法揭示）
Langmuir ( IF 3.7 ) Pub Date : 2018-04-19 00:00:00 , DOI: 10.1021/acs.langmuir.8b00178
Xuecong Pan _{1,

2} , Fangyuan Yang ₁ , Shunli Chen ₁ , Xuefeng Zhu ₁ , Chuanyi Wang ₁

Affiliation

通过总频率产生振动光谱法（SFG-VS）研究了一系列等摩尔的两性两性离子-离子表面活性剂混合物对空气-水界面的界面水结构的协同作用。对于两性离子表面活性剂棕榈基磺基甜菜碱（SNC ₁₆），阴离子表面活性剂十六烷基硫酸钠（SHS）和具有相同烷基链长度的阳离子表面活性剂十六烷基三甲基溴化铵（CTAB），两性离子-阴离子表面活性剂的界面水分子的排列显着增强。混合物SNC ₁₆ -SHS，表明SNC ₁₆相互作用更强与SHS比用CTAB因为强烈的首基，头部基团的静电引力的用于SNC ₁₆–SHS。同时，使用甲基和亚甲基对称拉伸模式的SFG振幅比来验证SNC ₁₆与SHS之间的较强相互作用。构象次序指示从0.64增加了SNC ₁₆至7.17 SNC ₁₆ -SHS但只有0.94 SNC ₁₆ -CTAB。此外，还引入了另一种阴离子表面活性剂十二烷基硫酸钠（SDS）来研究链间相互作用的影响。SNC ₁₆的界面水分子的SFG振幅降低–观察到SDS。因此，表面活性剂的头基-头基静电相互作用和链-链范德华力的吸引力相互作用在增强界面水分子的有序化方面起着重要作用。研究结果为表面活性剂的实际应用提供了实验和理论依据。

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Cooperative Effects of Zwitterionic–Ionic Surfactant Mixtures on the Interfacial Water Structure Revealed by Sum Frequency Generation Vibrational Spectroscopy

Cooperative effects of a series of equimolar binary zwitterionic–ionic surfactant mixtures on the interfacial water structure at the air–water interfaces have been studied by sum frequency generation vibrational spectroscopy (SFG-VS). For zwitterionic surfactant palmityl sulfobetaine (SNC₁₆), anionic surfactant sodium hexadecyl sulfate (SHS), and cationic surfactant cetyltrimethylammonium bromide (CTAB) with the same length of alkyl chain, significantly enhanced ordering of interfacial water molecules was observed for the zwitterionic–anionic surfactant mixtures SNC₁₆–SHS, indicating that SNC₁₆ interacts more strongly with SHS than with CTAB because of the strong headgroup–headgroup electrostatic attraction for SNC₁₆–SHS. Meanwhile, the SFG amplitude ratio of methyl and methylene symmetric stretching modes was used to verify the stronger interaction between SNC₁₆ and SHS. The conformational order indicator increased from 0.64 for SNC₁₆ to 7.17 for SNC₁₆–SHS but only 0.94 for SNC₁₆–CTAB. In addition, another anionic surfactant sodium dodecyl sulfate (SDS) was introduced to study the influence of chain–chain interaction. Decreased SFG amplitude of interfacial water molecules for SNC₁₆–SDS was observed. Therefore, both the headgroup–headgroup electrostatic interaction and chain–chain van der Waals attractive interaction of the surfactants play an important role in enhancing the ordering of interfacial water molecules. The results provided experimental and theoretical bases for practical applications of the surfactants.

更新日期：2018-04-19

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