Enthalpy relaxation of glassy glycerol prepared by rapid liquid quenching 1 Contribution No. 146 fro
Enthalpy relaxation of glassy glycerol prepared by rapid liquid quenching 1 Contribution No. 146 fro
复制标题
快速液体淬火制备玻璃态甘油的焓弛豫 1 贡献号 146
DOI：
10.1016/s0022-3093(98)00513-4
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发表时间：
1998
影响因子：
3.5
通讯作者：
T. Matsuo
中科院分区：
文献类型：
--
作者：
O. Yamamuro;Y. Oishi;M. Nishizawa;T. Matsuo
在自行研制的上加载式绝热量热计上，研究了玻璃态甘油的热焓弛豫。通过将样品池插入液氮中来制备玻璃状样品。冷却速率为5 K s-1，比普通绝热量热计的速率快100倍。快速淬火玻璃（RQG）的热容与正常淬火玻璃（NQG）的热容仅略有不同。RQG比NQG释放更大的焓，并且在比NQG的玻璃化转变温度低得多的温度下开始弛豫。我们根据亚当-吉布斯理论分析了这些数据。我们表明，松弛加速较大的构型熵（突出的结构无序）。
We have studied the enthalpy relaxation of glassy glycerol prepared by quenching of the liquid in a top-loading type adiabatic calorimeter developed by our group. The glassy sample was prepared by plunging the sample cell into liquid nitrogen. The cooling rate, 5 K s−1, was about 100 times faster than the rate available in ordinary adiabatic calorimeters. The heat capacity of the rapidly quenched glass (RQG) was only slightly different from that of the normally quenched glass (NQG). RQG released much larger enthalpy than NQG and the relaxations started at a much lower temperature than the glass transition temperatures of NQG. We analyzed these data in terms of the Adam–Gibbs theory. We demonstrate that the relaxation is accelerated by the larger configurational entropy (prominent structural disorder).