AI Article Synopsis
- The paper examines how temperature affects relaxation dynamics in glassy and supercooled liquid states of eutectic mixtures made from lidocaine and prilocaine, including their hydrochloride salts.
- Key findings highlight that electrostatic interactions greatly influence the dielectric and mechanical properties, leading to the discovery of an extra β-relaxation mode in certain glassy mixtures due to ion pair interactions.
- It was observed that as temperature rises beyond a specific point, both the fragility of the materials and the scale of dynamic heterogeneity consistently decrease, while proton transport becomes decoupled from structural dynamics, although its efficiency declines with increasing temperature.
Article Abstract
In this paper, we investigate the temperature-dependent relaxation dynamics in the glassy and supercooled liquid state of dipolar and ionic eutectic mixtures made of two anesthetic agents (lidocaine and prilocaine) and their hydrochloride salts, respectively. In addition to eutectic phases containing 1:1 and 4:1 mol/mol of LD/PRL and LD-HCl/PRL-HCl, respectively, the relaxation properties of non-eutectic compositions and parent compounds are also studied. We found that electrostatic long-range forces determine strongly the dielectric and mechanical response of eutectic material. As a result of Coulomb interactions between ion pairs, an additional β-relaxation mode was found in the dielectric spectra of glassy LD-HCl/PRL-HCl mixtures. On the other hand, the studies of relaxation dynamics of ionic and non-ionic mixtures at T > T revealed a continuous decrease of both fragility m and the length scale of dynamic heterogeneity N(T), with simultaneous growth of T, when the electrostatics forces appear. At the same time, we found the charge transport being decoupled from structural dynamics in all studied ionic binary mixtures that is due to the fast proton hopping. However, the efficiency of proton transport is dropping down with an increase of T.
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| http://dx.doi.org/10.1016/j.ejps.2019.04.014 | DOI Listing |
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