从复杂的介电容量测量结果预测玻璃成形液体的密度缩放指数
Marian Paluch1, Beibei Yao1, Jurgen Pionteck2
1August Chełkowski Institute of Physics, The University of Silesia in Katowice, 75 Pulku Piechoty 1a, 41-500 Chorzow, Poland.
Physical review letters
|September 8, 2023
概括
研究人员发现了一种新的方法,可以将玻璃形成液体中的分子间相互作用和分子动力学联系起来. 这种方法使用了另一种密度缩放方法来分析放松动态,简化了液态玻璃过渡的研究.
科学领域:
- 材料科学 材料科学 材料科学
- 物理化学 物理化学
- 凝聚物质物理学 凝聚物质物理学
背景情况:
- 了解液态玻璃过渡对于材料科学至关重要.
- 将分子间相互作用与分子动力学联系起来仍然是一个挑战.
- 密度缩放推进了对粘度和放松时间等动态量的研究.
研究的目的:
- 在玻璃成型器中建立分子间相互作用和分子动力学之间的直接联系.
- 探索一种替代的密度缩放概念来分析放松动态.
- 从实验数据中确定缩放指数 γ.
主要方法:
- 研究了范德瓦尔斯和H结合玻璃成型器的放松动态.
- 使用了另一个缩放方法:logτ_{α} vs T(Δε_{s}T) ^{-γ}.
- 从结构放松时间 (τ_{α}) 和介电放松强度 (Δε) 的温度和压力演变中确定了缩放指数 γ.
主要成果:
- 证明了范德瓦尔斯和H结合玻璃形成器的放松动态满足了替代的缩放定律.
- 基克伍德因子 (g_{K}) 是一个同态不变量,对这种缩放有意义.
- 缩放指数 γ 可以从单个介电实验中确定.
结论:
- 替代密度缩放提供了一种新的方法,用于将玻璃成型器中的分子间力量和分子动力学联系起来.
- 这种方法简化了缩放指数 γ 的确定.
- 该方法适用于广泛的玻璃成型液体,促进未来的研究.
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