Monitoring MgCl<sub>2</sub> hydrate formation from aqueous solutions using terahertz time-domain spectroscopy

Ion hydration plays a crucial role in numerous fundamental processes. Various spectroscopic methods are employed to investigate the slowing down of hydration bond dynamics in the proximity of both anions and cations. To date, most of these studies have primarily focused on the properties of binary systems. However, in comparison to ion–water binary systems, ternary systems that involve ions, water, and organic matter are more prevalent in nature and provide more realistic insights into biological processes. This study focuses on ion hydration in water and alcohol mixture using terahertz spectroscopy and x-ray diffraction (XRD). The results reveal a distinct behavior depending on the type of alcohol used. Specifically, the presence of both methanol and ethanol results in the disappearance of absorption peaks associated with NaCl hydrate at low temperatures. In contrast, tert-butanol does not exhibit such an effect, and isopropanol demonstrates a more complex response. By combining these terahertz spectroscopic findings with low-temperature XRD data, we gain insights into the formation, or lack thereof, of NaCl · 2H2O hydrate crystals. Crucially, our observations suggest a dominant correlation between the polarity of the alcohol molecules and its impact on the Na+ hydration. Strongly polar alcohols preferentially solvating the Na+ ion lead to the failure of hydrate formation, while weakly polar alcohols do not have this effect.

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

Abstract: Freezing-induced hydrate formation from MgCl2 aqueous solution was monitored using terahertz time-domain spectroscopy.

Cited by 4 publications

References 51 publications

Interactions between ions and water-DMSO mixed solvent

Interactions between ions and water-DMSO mixed solvent

Detecting the phase transitions of tert-butanol hydrate by terahertz spectroscopy

Terahertz fingerprint reveals the effect of alcohols on sodium ions hydration shell

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

Abstract: Freezing-induced hydrate formation from MgCl2 aqueous solution was monitored using terahertz time-domain spectroscopy.

Cited by 4 publications

References 51 publications

Interactions between ions and water-DMSO mixed solvent

Interactions between ions and water-DMSO mixed solvent

Detecting the phase transitions of tert-butanol hydrate by terahertz spectroscopy

Terahertz fingerprint reveals the effect of alcohols on sodium ions hydration shell

Contact Info

Product

Resources

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