Niss Kristine, Gundermann Ditte, Christensen Tage, Dyre Jeppe C
DNRF Centre Glass and Time, IMFUFA, Department of Sciences, Roskilde University, Postbox 260, DK-4000 Roskilde, Denmark.
Phys Rev E Stat Nonlin Soft Matter Phys. 2012 Apr;85(4 Pt 1):041501. doi: 10.1103/PhysRevE.85.041501. Epub 2012 Apr 9.
Based on previous works on polymers by Bauer et al. [Phys. Rev. E 61, 1755 (2000)], this paper describes a capacitative method for measuring the dynamical expansion coefficient of a viscous liquid. Data are presented for the glass-forming liquid tetramethyl tetraphenyl trisiloxane (DC704) in the ultraviscous regime. Compared to the method of Bauer et al., the dynamical range has been extended by making time-domain experiments and by making very small and fast temperature steps. The modeling of the experiment presented in this paper includes the situation in which the capacitor is not full because the liquid contracts when cooling from room temperature down to around the glass-transition temperature, which is relevant when measuring on a molecular liquid rather than a polymer.
基于鲍尔等人之前关于聚合物的研究工作[《物理评论E》61, 1755 (2000)]，本文描述了一种用于测量粘性液体动态膨胀系数的电容法。给出了超粘性状态下玻璃形成液体四甲基四苯基三硅氧烷（DC704）的数据。与鲍尔等人的方法相比，通过进行时域实验以及采取非常小且快速的温度步长，动态范围得到了扩展。本文所呈现实验的建模涵盖了这样一种情况，即由于液体从室温冷却至接近玻璃化转变温度时会收缩，导致电容器未充满，这种情况在测量分子液体而非聚合物时是相关的。
