Thermal Properties and Ionic Conductivities of Confined LiBF4 Dimethyl Carbonate Solutions

作者: Christopher M. Burba , Eric D. Butson , Justin R. Atchley , Mioto Sato Johnson

DOI: 10.1021/JP409243B

关键词: ElectrolyteElectron paramagnetic resonanceConductivityAnalytical chemistryIonic bondingInorganic chemistryMelting pointChemistryDimethyl carbonateLithium tetrafluoroborateMesoporous silica

摘要: Solutions of lithium tetrafluoroborate dissolved in dimethyl carbonate (DMC) are confined within MCM-41, a mesoporous silica matrix. Thermal measurements indicate that the melting points pure DMC and solutions significantly reduced when pores MCM-41 compared to unconfined samples; this is an observation consistent with Gibbs–Thomson equation. The point onsets slightly lower than DMC, suggesting salts impact phase-transition temperature silica. Rotational dynamics explored by doping small quantities Tempone, electron paramagnetic resonance (EPR)-active spin probe. Tempone rotational correlation times order magnitude slower for liquids solutions. Temperature-dependent conductivity composite materials suggest liquid electrolyte solution dis...

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