Microwave Dielectric Study of an Oligomeric Electrolyte Gelator by Time Domain Reflectometry

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• 作者：Shyamal Kumar Kundu ; Shin Yagihara ; Masaru Yoshida ; Mitsuhiro Shibayama
• 刊名：Journal of Physical Chemistry B
• 出版年：2009
• 出版时间：July 30, 2009
• 年：2009
• 卷：113
• 期：30
• 页码：10112-10116
• 全文大小：153K
• 年卷期：v.113,no.30(July 30, 2009)
• ISSN：1520-5207

文摘

The dynamics of water molecules in aqueous solutions of an oligomeric electrolyte gelator, poly[pyridinium-1,4-diyliminocarbonyl-1,4-phenylene-methylene chloride] (1-Cl) was characterized by microwave dielectric measurements using the time domain reflectometry method. The dielectric dispersion and absorption curves related to the orientational motion of water molecules were described by the Cole−Cole equation. Discontinuities were observed in the concentration dependence of the dielectric relaxation strength, Δε_h, as well as in the Cole−Cole parameter, β_h. These discontinuities were observed between the samples with concentrations of 6 and 7 g/L 1-Cl/water, which correspond to a change in the transparency. Such a discontinuity corresponds to the observation of the critical concentration of gelation. The interaction between water and 1-Cl molecules was discussed from the τ_h−β_h diagram. As 1-Cl carries an amide group, it could be expected that 1-Cl may interact hydrophilically with water, but the present result suggests that 1-Cl interact hydrophobically with water.