期刊
SENSORS
卷 23, 期 4, 页码 -出版社
MDPI
DOI: 10.3390/s23042292
关键词
THz sensing; ellipsometry; water solutions; hydrogen bonding
Using a customized time-domain ellipsometer operating in the THz range, the molecular dynamics of a liquid binary solution based on water and isopropyl alcohol (2-propanol) is investigated. The setup can detect small changes in the optical properties of the mixture in a single measurement. The complex dielectric response of samples with different concentrations is studied through direct measurement of the ellipsometric parameters. The deviations between experimental data and theoretical expectations at an intermediate volume percentage of 2-propanol in water are attributed to competing effects: the creation/destruction of hydrogen bonding and the presence of cluster/aggregation between water and alcohol molecules.
Using a customized time-domain ellipsometer operating in the THz range, the molecular dynamics of a liquid binary solution based on water and isopropyl alcohol (2-propanol) is investigated. The setup is capable of detecting small changes in the optical properties of the mixture within a single measurement. The complex dielectric response of samples with different concentrations is studied through the direct measurement of the ellipsometric parameters. The results are described using an effective Debye model, from which the relaxation parameters associated with different activation energies can be consistently extracted. Significant deviations between experimental data and the theoretical expectations at an intermediate volume percentage of 2-propanol in water are observed and interpreted as produced by competing effects: the creation/destruction of hydrogen bonding on the one hand, and the presence of cluster/aggregation between water and alcohol molecules on the other.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据