Water rotational relaxation time measurement by shortwave infrared micro spectroscopy(SWIR) at sub-zero temperatures.

Kawai, Kosei; Shirakashi, Ryo

Kawai, Kosei; Shirakashi, Ryo.

Afiliación

Kawai K; Department of Mechanical Engineering, Graduate School of Engineering, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Japan. Electronic address: kkawai@iis.u-tokyo.ac.jp.
Shirakashi R; Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Japan. Electronic address: aa21150@iis.u-tokyo.ac.jp.

Spectrochim Acta A Mol Biomol Spectrosc ; 322: 124707, 2024 Dec 05.

Article en En | MEDLINE | ID: mdl-38964024

ABSTRACT

ABSTRACT

The shortwave infrared spectroscopy (SWIR) is the noble method which allows to evaluate the rotational relaxation time of water (RRTW) in a sample. Because SWIR requires the reference sample of pure water, the measurement temperature is limited only at above 0 °C. In this study, we expanded this temperature limitation of SWIR by using alternative reference solutions with freezing points below 0 °C, including sugar and glycerol solutions. The results showed that some reference sample solutions are useable for evaluating RRTW in samples below 0 °C. It was found that RRTW in solution measured by newly proposed SWIR agrees with RRTW measured by dielectric spectroscopy in 10% accuracy when it is shorter than 100psec.

Palabras clave

Cryopreservation; Dielectric spectroscopy; Hydrogen bonding energy; IR spectrum; Short-wave infrared micro spectroscopy; Water rotational relaxation time

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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Spectrochim Acta A Mol Biomol Spectrosc Asunto de la revista: BIOLOGIA MOLECULAR Año: 2024 Tipo del documento: Article Pais de publicación: Reino Unido

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