Anisotropic ionogels of sodium laurate in a room-temperature ionic liquid Article

Jiang, W, Hao, J, Wu, Z. (2008). Anisotropic ionogels of sodium laurate in a room-temperature ionic liquid . 24(7), 3150-3156. 10.1021/la703632g



cited authors

  • Jiang, W; Hao, J; Wu, Z

fiu authors

abstract

  • Anisotropic thermally reversible ionogels of sodium laurate (SL) were prepared in the first discovered roomtemperature ionic liquid (RTIL), ethylammonium nitrate (EAN). Polarized optical microscope images indicate that the gels are birefringent, illuminating the presence of anisotropic structures. Small-angle X-ray scattering results reveal that SL and lauric acid (LA) molecules are arranged to form lamellar structures, but no SL crystallites were confirmed by the X-ray diffraction measurements. With an increase of the SL concentration, the interlayer distance decreases. Rheological measurements indicate that the anisotropic ionogels are highly viscoelastic and the storage modulus (G′) increases with an increase of the SL concentration in EAN. Electrochemical measurements indicate that the anisotropic ionogels may have potential applications in electrochemical fields. The intermolecular hydrogen bond as well as the solvatophobic interaction of SL and LA formed by a chemical reaction, CH3(CH2) 10COONa + CH 3CH2NH3NO3→ CH 3CH2NH2↑ + NaNO3↓ + CH3(CH2) 10COOH, can play a role in the formation of three-dimensional networks having lamellar structures which are responsible for the anisotropic ionogels. The formation of anisotropic ionogels by surfactants in RTILs could be a new phenomenon, but this is not a very classic case of organogels. © 2008 American Chemical Society.

publication date

  • April 1, 2008

Digital Object Identifier (DOI)

start page

  • 3150

end page

  • 3156

volume

  • 24

issue

  • 7