Measurement of non-equilibrium dynamical heat capacity by utilizin laser excited temperature wave

利用激光激发温度波测量非平衡动态热容

• 批准号: 04640360
• 负责人: KOJIMA Seiji
• 金额: $ 1.6万
• 依托单位: Institute of Aplied Physics, University of Tsukuba
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04640360/
• 关键词: glass transition; fragile liquid; dielectric relaxation; glycerol; propylene glycol; enthalpy relaxation; propanol; dynamical heat capacity; レーザー; 緩和; フォーゲル・ファルチャー則; 温度波; フラジル.リキッド; コール・コールプロット; 構造緩和

In this research the new method to measure the frequency dependence of dynamical heat capacity has been developed by utilizing the laser excited temperature waves at first. Secondly this method has been applied to investigate slow relaxation process in the liquid-glass transition of fragile liquids.In order to determine the frequency dependence of dynamical heat capacity the experimental setup was carefully designed as follows. The temperature waves were accurately excited on the surface of a sample by the stabilized semiconductor laser of which intensity was accurately modulated by the special electric circuit. The sample chamber was inserted in a vacuum vessel to avoid an acoustic noise and vibration. The liquid glass transitions of glycerol propylene glycol and propanol, which are typical materials of fragile liquid, were studied by the use of the experimental setup described above. The temperature dependences of the relaxation frequency and the distribution of relaxation time were accurately determined as a function of temperature. The dielectric dispersion was measured for the comparison. Furthermore Raman scattering was also measured to make clear the atomic motion. From these results the dynamical properties of liquid-glass transition was discussed.

本研究首次提出了利用激光激发温度波测量动态热容频率依赖性的新方法。其次，将该方法应用于脆性液体玻璃化转变的慢弛豫过程的研究。为了确定动态热容的频率依赖性，我们设计了如下实验装置。利用经特殊电路精确调制强度的稳频半导体激光器在样品表面精确激发温度波。将样品室插入真空容器中以避免声学噪声和振动。利用上述实验装置研究了甘油、丙二醇和丙醇这三种典型脆性液体的玻璃化转变。的弛豫频率和弛豫时间的分布的温度依赖性被准确地确定为温度的函数。测量介电色散用于比较。此外，还测量了拉曼散射以清楚原子的运动。根据这些结果讨论了液-玻璃转变的动力学性质。

项目成果

S.Kojima: ""Raman Scattering Sudy of Boson Peak of Glass"" Jpn.J.Appl.Phys.32. 2223-2226 (1993)

S.Kojima：“玻璃玻色子峰的拉曼散射研究”Jpn.J.Appl.Phys.32。

小島誠治: "Anomalous Behavior of O-H Stretching Vibrational Mode in Glycerol." J.Mol.Struc.294. 193-196 (1993)

Seiji Kojima：“甘油中 O-H 拉伸振动模式的异常行为。”J.Mol.Struc.294（1993）。

小島誠治: "ガラス転移における低波数ラマン散乱" 物性研究. 59. 601-606 (1993)

Seiji Kojima：“玻璃化转变中的低波数拉曼散射”凝聚态物质研究 59. 601-606 (1993)。

谷津明生.小島誠治.鈴木哲郎: "Study of glasstransition of propanol by photoacoustic method" Jpn.J.Appl.Phys. (発表予定). (1994)

Akio Yatsu. Seiji Kojima。Tetsuro Suzuki：“通过光声方法研究丙醇的玻璃化转变”（Jpn.J.Appl.Phys）（即将发表）。

小島誠治.比企能夫.木暮嘉明: "非平衡、不均一系の熱物性-動的感受率と緩和現象-" 熱物性. 7. 57-62 (1993)

Seiji Kojima、Yoshio Hiki 和 Yoshiaki Kogure：“非平衡、异质系统的热物理性质 - 动态磁化率和弛豫现象 -”热物理性质 7. 57-62 (1993)。