期刊
NANOSCALE ADVANCES
卷 3, 期 17, 页码 4973-4978出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1na00452b
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资金
- Russian Science Foundation [19-13-00071]
- Russian Science Foundation [19-13-00071] Funding Source: Russian Science Foundation
Recent studies have shown intriguing heterogeneities and nanostructural reorganizations in glassy ionic liquids, with alkyl chains playing a key role. Similar manifestations have been observed in common non-IL glasses containing molecules with alkyl chains, but the development of anomalies is hindered by lower glass transition temperatures.
Intriguing heterogeneities and nanostructural reorganizations of glassy ionic liquids (ILs) have recently been found using electron paramagnetic resonance (EPR) spectroscopy. Alkyl chains of IL cations play the key role in such phenomena and govern the anomalous temperature dependence of local density and molecular mobility. In this paper we evidence and study similar manifestations in a variety of common non-IL glasses, which also contain molecules with alkyl chains. A series of phthalates clearly demonstrates very similar behavior to imidazolium-based ILs with the same length of alkyl chain. Glasses of alkyl alcohols and alkyl benzenes show only some similarities to the corresponding ILs, mainly due to a lower glass transition temperature hindering the development of the anomaly. Therefore, we demonstrate the general nature and broad scope of nanoscale structural anomalies in organic glasses based on alkyl-chain compounds. The 'roadmap' for their occurrence is provided, which aids in understanding and future applications of these anomalous nanoheterogeneities.
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