Dynamic properties of the polyethylene glycol molecules on the oscillating solid-liquid interface

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• 作者：Minoru Yoshimoto^a ; ^{myoshi@ibe.kagoshima-u.ac.jp} ; Yukiko Yuda^a ; Hidenobu Aizawa^b ; Hiroaki Sato^b ; Shigeru Kurosawa^b
• 关键词：Quartz crystal microbalance ; Polyethylene glycol ; Solid&ndash ; liquid interface ; Resonant length
• 刊名：Analytica Chimica Acta
• 出版年：2012
• 期刊代码：2_00032670
• 类别：ch
• 出版时间：20 June, 2012
• 卷：731
• 期：Complete
• 页码：82-87
• 文件大小：501 K

摘要

The dynamic properties of polyethylene glycol (PEG) molecules on the solid-liquid interface oscillating at MHz were investigated using the quartz crystal microbalance (QCM). The number-average molecular weights (M_n) of the PEG molecules were systematically varied over 4 orders of magnitude. This study makes it clear that the series-resonant frequency shift, 螖F, of the QCM against the square root of the density-viscosity product of the PEG solution is linear and has the intercept. Moreover, systematical analysis reveals that the 螖F slope rapidly decreases with M_n and that the 螖F intercept becomes constant above 4.0 脳 10³ g mol^鈭?. As a result, those reveal that the resonant length of the PEG molecule moving with the oscillating plate of 9 MHz is 54.2 脜. We also find that the behaviors of 螖F due to M_n are mainly caused by the length of the PEG molecule.