Dramatic change in viscosities of pure ionic liquids upon addition of molecular solvents

TitleDramatic change in viscosities of pure ionic liquids upon addition of molecular solvents
Publication TypeJournal Article
Year of Publication2009
AuthorsKhupse, ND, Kumar, A
JournalJournal of Solution Chemistry
Volume38
Issue5
Pagination589-600
Date PublishedMAY
ISSN0095-9782
Keywordsionic liquids, Molecular solvents, VFT equations, viscosity
Abstract

Viscosities of binary mixtures of pyridinium based ionic liquids (1-butyl pyridinium tetrafluoroborate, [BP][BF(4)], 1-butyl 3-methyl pyridinium tetrafluoroborate [3-MBP][BF(4)], 1-butyl 4-methyl pyridinium tetrafluoroborate, [4-MBP][BF(4)]), and phosphonium based ionic liquids, (tetrabutyl phosphonium alaninate, [TBP][Ala]; tetrabutyl phosphonium valinate, [TBP][Val]) with the molecular solvents, water, methanol and dichloromethane, have been measured at 298.15 K. A Brookfield ultra-rheometer was employed to measure the reported viscosities. The drop in viscosity in the close vicinity of pure ionic liquid is more prominent in polar solvents like water compared to less polar solvents. The temperature dependence of this observation was also studied for binary mixtures of [4-MBP][BF(4)] with water in range of 298.15-323.15 K. The Vogel-Fulcher-Tamman (VFT) equation was employed to investigate the temperature dependence of the viscosities of pure pyridinium-based ionic liquids in the temperature range from 298.15-323.15 K.

DOI10.1007/s10953-009-9390-7
Type of Journal (Indian or Foreign)Foreign
Impact Factor (IF)1.335
Divison category: 
Physical and Materials Chemistry