Controlled self-assembly of amphiphiles in ionic liquids and the formation of ionogels by molecular tuning of cohesive energies

Takuya Nakashima, Nobuo Kimizuka

    Research output: Contribution to journalArticlepeer-review

    23 Citations (Scopus)

    Abstract

    In this paper, the self-assembling characteristics of a series of L-glutamate-based ammonium amphiphiles are studied in ionic liquids (ILs). These cationic amphiphiles are dispersible in imidazolium ILs with bis((trifluoromethyl)sulfonyl)amide (TFSA) anion. Amphiphiles-containing didodecyl ester or short dioctyl amide groups were molecularly dispersed in conventional 1-butyl-3-methylimidazolium TFSA, whereas they formed bilayer membranes when they were dispersed in polar, ether linkage-introduced IL. Thus, the modification of ILs exerts a crucial influence on amphiphilic self-assembly. Enhancement of the intermolecular interactions of L-glutamate amphiphiles is achieved by introducing multiple amide bonds and longer alkyl chains, which leads to better self-assembling properties. These amide-enriched amphiphiles form fibrous bilayer assemblies even in conventional ILs with low cohesive energy densities. These observations confirm that the formation of bilayer membranes in ILs is a general phenomenon when the solute molecules have the appropriate ionophilic/ionophobic nature.

    Original languageEnglish
    Pages (from-to)665-671
    Number of pages7
    JournalPolymer Journal
    Volume44
    Issue number6
    DOIs
    Publication statusPublished - Jun 2012

    All Science Journal Classification (ASJC) codes

    • Polymers and Plastics
    • Materials Chemistry

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