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Erschienen in: Colloid and Polymer Science 7/2017

10.05.2017 | Original Contribution

Palmitoylated amino acids as low-molecular-weight gelators for ionic liquids

verfasst von: Witta Kartika Restu, Yuki Nishida, Toshikazu Kataoka, Masahiro Morimoto, Kenji Ishida, Minoru Mizuhata, Tatsuo Maruyama

Erschienen in: Colloid and Polymer Science | Ausgabe 7/2017

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Abstract

We report palmitoylated amino acids (glycine, l-valine, l-isoleucine, l-aspartic acid, l-glutamic acid, l-methionine, l-phenylalanine, l-lysine) as low-molecular-weight gelators for ionic liquids (ILs). The palmitoylated amino acids gelate ammonium- and imidazolium-based ILs, at gelation concentrations of 0.3–1.6 wt.%, despite their simple molecular structures. Eight types of gelators are synthesized, with palmitoylated methionine (Pal-Met) and palmitoylated phenylalanine (Pal-Phe) exhibiting high gelation ability toward the tested ILs. Scanning electron microscopy and confocal laser scanning microscopy observations suggest that the gelator molecules self-assemble into nanofibers within the ILs, which leads to gelation. The ionogels exhibit reversible thermal transition and viscoelastic properties, which are typical of gels. Fourier-transform infrared spectra recorded at various temperatures reveal that hydrogen bonding and van der Waals interactions between gelator molecules are important in the self-assembly. Incorporating gelators of varying concentrations do not affect the intrinsic conductivities of the ILs.

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Metadaten
Titel
Palmitoylated amino acids as low-molecular-weight gelators for ionic liquids
verfasst von
Witta Kartika Restu
Yuki Nishida
Toshikazu Kataoka
Masahiro Morimoto
Kenji Ishida
Minoru Mizuhata
Tatsuo Maruyama
Publikationsdatum
10.05.2017
Verlag
Springer Berlin Heidelberg
Erschienen in
Colloid and Polymer Science / Ausgabe 7/2017
Print ISSN: 0303-402X
Elektronische ISSN: 1435-1536
DOI
https://doi.org/10.1007/s00396-017-4093-x

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