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Testing density scaling in nanopore-confinement for hydrogen-bonded liquid dipropylene glycol

机译:纳米孔限制氢键合液二丙二醇的纳米池凝固密度缩放

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摘要

Recently, it has been demonstrated that the glassy dynamics of the molecular liquids and polymers confined at the nanoscale level might satisfy the density scaling law (rho(gamma)/T) with the same value of the scaling exponent, gamma, as that determined from the high-pressure studies of the bulk material. In this work, we have tested the validity of this interesting experimental finding for strongly hydrogen-bonded molecular liquid, dipropylene glycol (DPG), which is known to violate the rho(gamma)/T scaling rule in the supercooled liquid bulk state. The results of the independent dielectric relaxation studies carried out on increased pressure and in nanopores, have led to an important finding that when the density change induced by geometrical confinement is not very large, DPG can still obey the density scaling law with the same value of the scaling exponent as that found for the bulk sample. In this way, we confirm that the information obtained from the universal density scaling approach applied to nanoscale confined systems is somehow consistent with the macroscopic ones and that in both cases the same fundamental rules governs the glass-transition dynamics.
机译:最近,已经证明,在纳米级水平上限制的分子液体和聚合物的玻璃状动态可以满足密度缩放法(rho(γ)/ t)具有相同的缩放指数,伽玛的值,如此散装材料的高压研究。在这项工作中,我们已经测试了这种有趣的实验发现对强氢键合的分子液,二丙二醇(DPG)的有效性的有效性,已知侵犯过冷液体散装状态的RHO(γ)/ T缩放规则。在增加压力和纳米孔中进行的独立介电松弛研究的结果导致了一个重要的发现,当几何限制引起的密度变化不是很大时,DPG仍然可以使用相同的值遵守密度缩放法缩放指数,如批量样本。以这种方式,我们确认从应用于纳米级狭窄系统的通用密度缩放方法获得的信息以某种方式与宏观的方式一致,并且在这两种情况下,相同的基本规则管理玻璃转换动态。

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  • 来源
    《RSC Advances》 |2019年第36期|共9页
  • 作者单位

    Univ Silesia Inst Phys 75 Pulku Piechoty 1 PL-41500 Chorzow Poland;

    Univ Silesia Inst Phys 75 Pulku Piechoty 1 PL-41500 Chorzow Poland;

    Univ Silesia Inst Phys 75 Pulku Piechoty 1 PL-41500 Chorzow Poland;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

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