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In situ Raman and X-ray scattering of a single supersaturated aqueous Mg(NO3)2 droplet ultrasonically levitated

In situ Raman and X-ray scattering of a single supersaturated aqueous Mg(NO3)2 droplet... A single liquid droplet in the air generated by ultrasonic levitation provides such analytical advantages as a small sample volume (~ μL) for expensive proteins, container-free condition for deeply supercooling and supersaturation, time-dependent observation, and homogeneous rapid mixing. The investigation of the properties and structure of a droplet at a molecular level is highly needed for understanding the physicochemical behaviors of a droplet and an underlying mechanism of processes in the droplet. We develop in situ Raman and synchrotron X-ray scattering methods of a single liquid droplet of ~ 1 mm size ultrasonically levitated. The composition of a supersaturated Mg(NO3)2 droplet and speciation in the droplet are determined by analyzing the nitrate N–O and the water O–H stretching vibrational Raman bands. The X-ray interference function of an supersaturated Mg(NO3)2 droplet is subjected to an empirical potential structure refinement modeling to reveal the ion solvation, association, and solvent water structure. Furthermore, crystallization of Mg(NO3)2⋅nH2O from a saturated droplet is observed and identified.Graphical abstract[graphic not available: see fulltext] http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Analytical Sciences Springer Journals

In situ Raman and X-ray scattering of a single supersaturated aqueous Mg(NO3)2 droplet ultrasonically levitated

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Publisher
Springer Journals
Copyright
Copyright © The Author(s), under exclusive licence to The Japan Society for Analytical Chemistry 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
ISSN
0910-6340
eISSN
1348-2246
DOI
10.1007/s44211-023-00306-8
Publisher site
See Article on Publisher Site

Abstract

A single liquid droplet in the air generated by ultrasonic levitation provides such analytical advantages as a small sample volume (~ μL) for expensive proteins, container-free condition for deeply supercooling and supersaturation, time-dependent observation, and homogeneous rapid mixing. The investigation of the properties and structure of a droplet at a molecular level is highly needed for understanding the physicochemical behaviors of a droplet and an underlying mechanism of processes in the droplet. We develop in situ Raman and synchrotron X-ray scattering methods of a single liquid droplet of ~ 1 mm size ultrasonically levitated. The composition of a supersaturated Mg(NO3)2 droplet and speciation in the droplet are determined by analyzing the nitrate N–O and the water O–H stretching vibrational Raman bands. The X-ray interference function of an supersaturated Mg(NO3)2 droplet is subjected to an empirical potential structure refinement modeling to reveal the ion solvation, association, and solvent water structure. Furthermore, crystallization of Mg(NO3)2⋅nH2O from a saturated droplet is observed and identified.Graphical abstract[graphic not available: see fulltext]

Journal

Analytical Sciences – Springer Journals

Published: Jun 1, 2023

Keywords: Liquid droplet; Structure; Ion solvation; Crystallization; X-ray scattering; Raman scattering

References