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首页> 外文期刊>Bulletin of the American Physical Society >APS -APS March Meeting 2017 - Event - Mechanism of Selective Adsorption of Ions to Aqueous Interfaces: Graphene/Water vs. Air/Water
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APS -APS March Meeting 2017 - Event - Mechanism of Selective Adsorption of Ions to Aqueous Interfaces: Graphene/Water vs. Air/Water

机译：APS -APS 2017年3月会议-活动-离子对水界面的选择性吸附机理：石墨烯/水与空气/水

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The behavior of ions at aqueous interfaces has been a subject of much controversy for over a century. By exploiting the strong charge-transfer-to-solvent (CTTS) resonances of selected anions in aqueous electrolytes, their adsorption properties have measured by deep UV-SHG spectroscopy methods for both air/water and graphene/water interfaces. Temperature and concentration dependences determined by both experiment and computer simulations for the air/water case reveal that the strong interfacial adsorption observed for weakly hydrated ions is enthalpically driven by hydration forces and impeded by a novel entropy effect(capillary wave suppression). Extension of this approach to the water-graphene interface reveals a surprising similarity to the air-water case, albiet with different mechanistic details. Our recent development of a broadband deep UV SFG spectroscopy technique has produced detailed CTTS spectra of interfacial ions, for which comparisons with bulk CTTS spectra provide additional new insights. D.E. Otten, P. Shaffer, P. Geissler, R.J. Saykally, extit{Elucidating the Mechanism of Selective Ion Adsorption to the Liquid Water Surface}, PNAS extbf{109}, 701(2012).
机译：一个多世纪以来，离子在水界面的行为一直是许多争议的主题。通过利用选定阴离子在水性电解质中的强电荷转移至溶剂（CTTS）共振，可以通过深UV-SHG光谱法测量空气/水和石墨烯/水界面的吸附性能。通过对空气/水情况的实验和计算机模拟确定的温度和浓度依赖性表明，观察到的弱水合离子的强界面吸附受水合力的驱动，并受到新的熵效应（毛细管波抑制）的阻碍。将此方法扩展到水-石墨烯界面显示出与空气-水情况惊人的相似性，不同的机械细节也不同。我们最近对宽带深紫外SFG光谱技术的开发已产生了界面离子的详细CTTS光谱，为此，与大量CTTS光谱的比较提供了新的见解。 Otten，P.Shaffer，P.Geissler，R.J。 Saykally，extit {阐明选择性离子吸附到液态水表面的机理}，PNAS extbf {109}，701（2012）。

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