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首页> 外文期刊>RSC Advances >Simultaneous neutron reflectometry and infrared reflection absorption spectroscopy (IRRAS) study of mixed monolayer reactions at the air-water interface
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Simultaneous neutron reflectometry and infrared reflection absorption spectroscopy (IRRAS) study of mixed monolayer reactions at the air-water interface

机译：同时中子反射测量和红外反射吸收光谱（IRRAS）在空气 - 水界面处的混合单层反应研究

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摘要

The simultaneous application of neutron reflectometry (NR) and infrared reflection absorption spectroscopy (IRRAS) to the study of the oxidation kinetics of organic monolayers at the air-water interface is described for the first time. This advance was possible thanks to the development of a new sample environment that includes a gas-delivery system and is compatible with in situ application of the two techniques within the constraints of short-term neutron beam-line access. We studied the oxidation of monolayers of the mono-molecular film palmitoleic acid and of a binary mixture of oleic (OA) and stearic (SA) acids by gas-phase ozone. We contrast the two highly complementary techniques and demonstrate that IRRAS provides key additional insight into the alignment of surfactant molecules at the air-water interface. We highlight the potential of the more economical and widely available IRRAS technique to complement NR studies. We also found an apparent increase of the NR signal upon oxidation of a mixed SA/OA monolayer, as well as evidence of slow intensity fluctuations of the SAgenerated IRRAS signal. We demonstrate how simultaneous NR-IRRAS substantially enhances future studies of increasingly complex surfactant mixtures and their atmospheric surface reactions.
机译：第一次描述了中子反射测量（NR）和红外反射吸收光谱（IRRAS）和红外反射吸收光谱（IRRAS）对有机单层的氧化动力学研究的研究。由于包括燃气输送系统的新样本环境的开发，这一进步是可能的，并且与短期中子束线路的约束内的两种技术的原位应用兼容。我们研究了通过气相臭氧的单分子薄膜棕榈药酸和油（OA）和硬脂酸（SA）酸的二元混合物的单层氧化。我们对比两种高度互补的技术进行了对比，并证明了Irras提供了对空气界面处的表面活性剂分子的对准的关键额外洞察。我们突出了更经济和广泛可用的IRRAC技术来补充NR研究的潜力。我们还发现在混合的SA / OA单层氧化时NR信号的表观增加，以及Sagenerated InRAS信号的缓慢强度波动的证据。我们展示了如何同时NR-Irras基本上提高了对越来越复杂的表面活性剂混合物及其大气表面反应的未来研究。

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  • 来源
    《RSC Advances》 |2017年第54期|共7页
  • 作者

    Skoda Maximilian W. A.; Thomas Benjamin; Hagreen Matthew; Sebastiani Federica; Pfrang Christian;

  • 作者单位

    Sci &

    Technol Facil Council Rutherford Appleton Lab ISIS Pulsed Neutron &

    Muon Source Harwell OX11 OQX Oxon England;

    Sci &

    Technol Facil Council Rutherford Appleton Lab ISIS Pulsed Neutron &

    Muon Source Harwell OX11 OQX Oxon England;

    Univ Reading Dept Chem POB 224 Reading RG6 6AD Berks England;

    Univ Reading Dept Chem POB 224 Reading RG6 6AD Berks England;

    Univ Reading Dept Chem POB 224 Reading RG6 6AD Berks England;

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  • 正文语种 eng
  • 中图分类 化学;
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