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Probing NaCl hydrate formation from aqueous solutions by Terahertz Time-Domain Spectroscopy
Chen, Ligang Ren, Guanhua Liu, Liyuan Guo, Pan Wang, Endong Zhu, Zhongjie Yang, Jinrong Shen, Jianxiong Zhang, Zongchang Zhou, Lu
Chen, Ligang
Ren, Guanhua
Liu, Liyuan
Guo, Pan
Wang, Endong
Zhu, Zhongjie
Yang, Jinrong
Shen, Jianxiong
Zhang, Zongchang
Zhou, Lu
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Publication Date
2020-06-16
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Abstract
The cooling-induced formation of hydrate in aqueous NaCl solutions was probed using terahertz time-domain spectroscopy (THz-TDS). It was found that the NaCl hydrate formation is accompanied with emergence of four new absorption peaks at 1.60, 2.43, 3.34 and 3.78 THz. Combining the X-ray diffraction measurement with the solid-state based density functional theory (DFT) calculations, we assign the observed terahertz absorption peaks to the vibrational modes of the formed NaCl⋅2H2O hydrate during cooling. This work dedicates THz-TDS based analysis great potential in studying ionic hydrate and the newly revealed collective vibrational modes could be the sensitive indicators to achieve quantitative analysis in phase transitions and lattice dynamics.
Citation
Chen, L., Ren, G., Liu, L., Guo, P., Wang, E., Zhu, Z., Yang, J., Shen, J., Zhang, Z., Zhou, L., Zhang, J., Yang, B., Zhang, W., Gao, Y., Zhao, H., & Han, J. (2020). Probing NaCl hydrate formation from aqueous solutions by terahertz time-domain spectroscopy. Physical Chemistry Chemical Physics, 22, 17791-17797. DOI https://doi.org/10.1039/D0CP01571G
Publisher
Royal Society of Chemistry
Journal
Physical Chemistry Chemical Physics
Research Unit
DOI
10.1039/D0CP01571G
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PubMed Central ID
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Article
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ISSN
EISSN
1463-9084