Vitrification, relaxation and free volume in glycerol-water binary liquid mixture: Spin probe ESR studies
Vitrification, relaxation and free volume in glycerol-water binary liquid mixture: Spin probe ESR studies
复制标题
甘油-水二元液体混合物中的玻璃化、弛豫和自由体积： 自旋探针 ESR 研究
DOI：
10.1016/j.jnoncrysol.2009.08.045
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发表时间：
2009-12-01
影响因子：
3.5
通讯作者：
Bhat, S. V.
中科院分区：
文献类型：
--
作者：
Banerjee, Debamalya;Bhat, S. V.
用高灵敏的电子自旋共振（ESR）技术研究了甘油-水（G-W）二元混合物体系在5- 85mol%甘油浓度范围内的玻璃化转变和弛豫。对于富含水的混合物，由溶解的自旋探针感测的玻璃化转变来自二元系统的玻璃化介观部分。玻璃化转变温度的浓度依赖性表现出密切相关的分子水平的系统中的协同性。在40摩尔%的临界浓度的系统的介观结构的急剧变化被确认的自旋探针有效体积的估计在示踪剂的重定向强烈耦合到系统动力学的温度范围内。(C)2009 Elsevier B. V.保留所有权利。
Glass transition and relaxation of the glycerol-water (G-W) binary mixture system have been studied over the glycerol concentration range of 5-85 mol% by using the highly sensitive technique of electron spin resonance (ESR). For the water rich mixture the glass transition, sensed by the dissolved spin probe, arises from the vitrified mesoscopic portion of the binary system. The concentration dependence of the glass transition temperature manifests a closely related molecular level cooperativity in the system. A drastic change in the mesoscopic structure of the system at the critical concentration of 40 mol% is confirmed by an estimation of the spin probe effective volume in a temperature range where the tracer reorientation is strongly coupled to the system dynamics. (C) 2009 Elsevier B.V. All rights reserved.