Issue 38, 2022

Monitoring MgCl2 hydrate formation from aqueous solutions using terahertz time-domain spectroscopy

Abstract

The interaction of MgCl2 with H2O is heavily involved in biological and chemical processes. In this work, freezing-induced hydrate formation from MgCl2 aqueous solution was monitored using terahertz time-domain spectroscopy. At low temperatures, two phase transitions from brine to hydrate formation could be clearly observed, and the formation of hydrate was accompanied by the emergence of new THz fingerprint peaks at 1.02, 1.56, and 1.84 THz, respectively. Integrating XRD and quantum chemical calculations, we attributed the absorption peaks to the vibrational modes of the formed MgCl2·12H2O. This demonstrates the potential of THz spectroscopy for application in the detection of biological processes in low-temperature environments, such as cell freezing.

Graphical abstract: Monitoring MgCl2 hydrate formation from aqueous solutions using terahertz time-domain spectroscopy

Article information

Article type
Paper
Submitted
14 Jul 2022
Accepted
25 Aug 2022
First published
21 Sep 2022

Phys. Chem. Chem. Phys., 2022,24, 23490-23496

Monitoring MgCl2 hydrate formation from aqueous solutions using terahertz time-domain spectroscopy

Y. Yan, J. Zhang, G. Ren, L. Zhou, L. Liu, X. Zhang, L. Chen, C. Ouyang and J. Han, Phys. Chem. Chem. Phys., 2022, 24, 23490 DOI: 10.1039/D2CP03231G

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