エレクトロスプレーの原理を利用したダイナミックな界面反応測定

概要

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The air/water interface plays ubiquitous and fundamental roles in atmospheric chemistry and biochemistry involving reactive gas uptake on aerosol/seawater surface and natural defense mechanism by epithelial lining fluids that protects our lungs from the attack of air pollution. Previous studies partly revealed unexpected features of gas-liquid interactions including enhanced reactivity, presence of surface complexes or enhanced anion concentration. Molecular dynamics simulations and surface-sensitive spectroscopic studies show a progress for molecular-level understanding of gas-liquid interface. Here, we review a recent development of novel application of electrospray ionization that could directly monitor chemical reactions at the air/water interface, in which the aerial interface of liquid microjet sprayed into reactive gas is monitored via electrospray mass spectrometry. Because the ions are ultimately ejected from the topmost layers of initial liquid microjet, the change of chemical compositions at the air/water interface can be selectively measured. This novel technique is demonstrated to be a powerful tool in investigating rapid interfacial reactions that could be used for various scientific fields.