Intermolecular Interactions at the Interface Quantified by Surface-Sensitive Second-Order Fermi Resonant Signals

Intermolecular Interactions at the Interface Quantified by Surface-Sensitive Second-Order Fermi Resonant Signals
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通过表面敏感的二阶费米共振信号量化界面处的分子间相互作用

DOI:
10.1021/acs.jpcc.5b03204
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发表时间:
2015-07
影响因子:
3.7
通讯作者:
Yi Luo
Yi Luo
中科院分区:
化学3区
文献类型:
--
作者:
Kangzhen Tian;Baixiong Zhang;Shuji Ye;Yi Luo

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准确测定表面和界面的分子间相互作用力对于确定界面现象的性质(如吸收、界面组装和特定离子效应)至关重要,但它仍然是一个重大的技术挑战。在这项研究中,我们提出了一种新的方法来推断界面相互作用力通过使用表面敏感的二阶费米共振信号,产生的和频振动光谱(SFG-VS)。通过研究脂链长度和分子间距离对磷脂单层在空气/CaF 2表面和空气/水界面处的费米共振信号的影响,发现费米共振强度比与脂单层中的主要相互作用之间存在线性相关关系.这表明强度比的振幅可以作为一个有效的原位振动光学标尺来表征表面和表面的总分子间相互作用力。
Accurate determination of intermolecular interaction forces at the surface and the interface is essential to identify the nature of interfacial phenomena such as absorption, interfacial assembly, and specific ion effect, but it still represents a major technical challenge. In this study, we proposed a novel method to deduce the interfacial interaction forces by using surface-sensitive second-order Fermi resonant signals, generated in sum frequency generation vibrational spectroscopy (SFG-VS). By investigating the influence of lipid chain length and intermolecular distance on the Fermi resonant signals of phospholipid monolayer at the air/CaF2 surface and the air/water interface, a linear correlation between the Fermi resonant intensity ratio and the dominated interactions in the lipid monolayer has been observed. It implies that the amplitude of the intensity ratio can be used as an effective in situ vibrational optical ruler to characterize the total intermolecular interaction forces at the surface and t...
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