AI Article Synopsis
- This study investigates how the length of alkyl chains in alkyltriethylammonium-based ionic liquids affects both dynamic heterogeneity and dynamic behavior during transitions.
- The researchers used techniques like differential scanning calorimetry and broadband dielectric spectroscopy to show that these ionic liquids are great at forming glass and have good ionic conductivity at room temperature.
- Results indicate that as the alkyl chain length increases, the number of correlated molecules at the glass transition decreases and the temperature where complex dynamics begin also rises.
Article Abstract
This study explores the impact of alkyl chain length on dynamic heterogeneity and dynamic crossover in alkyltriethylammonium-based ionic liquids ([TEA-R][TFSI]) with varying alkyl chain lengths (R = C6, C8, and C10). Using differential scanning calorimetry and broadband dielectric spectroscopy, we observed that these ionic liquids are excellent glassformers with notable ionic conductivity at room temperature. Furthermore, the number of dynamically correlated molecules at the glass transition temperature, reflecting the dynamic heterogeneity, is exceptionally small for TEA-R ILs and becomes more reduced with longer alkyl chains. Moreover, the temperature dependence of conductivity requires two Vogel-Fulcher-Tammann equations with distinct sets of fitting parameters for an accurate description. The crossover temperature , indicating the transition to complex dynamics, increases with the alkyl chain length.
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| http://dx.doi.org/10.1021/acs.jpcb.4c05070 | DOI Listing |
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