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Updated: Jun 15, 2026

Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy
Published on: May 27, 2018
High frequency spectroscopic study of the bound state of water in PEG-H2O system during heating from frozen state
Takaya Takei1, Yoshinori Sugitani
1Department of Chemistry, Faculty of Science, Kanagawa University, 2946 Tsuchiya, Hiratsuka 259-1293, Japan. takaya@kanagawa-u.ac.jp
Abstract:
The bound state of water in PEG (polyethylene glycol)-H(2)O systems was studied by using HFS and DSC methods. Samples with the mixing ratios EO:H(2)O = 1:1 (a) and 1:10 (b), where EO indicates the ethylene oxide units in PEG chain, were heated from frozen state to melt state. Sample (a) gave an HFS peak corresponding to the weakly bound water, while sample (b) gave the peaks of both the bound and free water. DSC measurements gave quite similar patterns to those of HFS measurements, but with additional peaks corresponding to cold crystallization. The difference between the two measurements was reasonably interpreted by considering the origin of the cold crystallization.
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