Physicochemical and solution properties of quaternary-ammonium-salt-type amphiphilic trimeric ionic liquids

2019 ◽  
Vol 21 (45) ◽  
pp. 25065-25071 ◽  
Author(s):  
Risa Kawai ◽  
Shiho Yada ◽  
Tomokazu Yoshimura
Keyword(s):  
Ionic Liquids ◽  
Melting Point ◽  
Ammonium Salt ◽  
Quaternary Ammonium ◽  
Quaternary Ammonium Salt ◽  
Solution Properties

The amphiphilic linear- and star-type trimeric ionic liquids show different melting point behaviours.

Ionic Liquids Based upon Metal Halide/Substituted Quaternary Ammonium Salt Mixtures

2004 ◽  
Vol 43 (11) ◽  
pp. 3447-3452 ◽  
Author(s):  
Andrew P. Abbott ◽  
Glen Capper ◽  
David L. Davies ◽  
Raymond Rasheed
Keyword(s):  
Ionic Liquids ◽  
Ammonium Salt ◽  
Quaternary Ammonium ◽  
Quaternary Ammonium Salt ◽  
Metal Halide ◽  
Salt Mixtures

scholarly journals Surface Adsorption Properties and Layer Structures of Homogeneous Polyoxyethylene-Type Nonionic Surfactants in Quaternary-Ammonium-Salt-Type Amphiphilic Gemini Ionic Liquids with Oxygen- or Nitrogen-Containing Spacers

Molecules ◽  
2020 ◽  
Vol 25 (21) ◽  
pp. 4881
Author(s):  
Risa Kawai ◽  
Maiko Niki ◽  
Shiho Yada ◽  
Tomokazu Yoshimura
Keyword(s):  
Surface Tension ◽  
Ionic Liquids ◽  
Ammonium Salt ◽  
Quaternary Ammonium ◽  
Quaternary Ammonium Salt ◽  
Nonionic Surfactants ◽  
Alkyl Chain ◽  
Surface Adsorption ◽  
X Ray ◽  
Layer Structures

The amphiphilic ionic liquids containing an alkyl chain in molecules form nano-structure in the bulk, although they also show surface activity and form aggregates in aqueous solutions. Although insights into the layer structures of ionic liquids were obtained using X-ray and neutron scattering techniques, the nanostructures of ionic liquids remain unclear. Herein, the surface adsorption and bulk properties of homogeneous polyoxyethylene (EO)-type nonionic surfactants (CxEO6; x = 8, 12, or 16) were elucidated in quaternary-ammonium-salt-type amphiphilic gemini ionic liquids with oxygen or nitrogen-containing spacers [2Cn(Spacer) NTf2; (Spacer) = (2-O-2), (2-O-2-O-2), (2-N-2), (2/2-N-2), (3), (5), or (6); n = 10, 12, or 14 for (2-O-2) and n = 12 for all other spacers] by surface tension, small- and wide-angle X-ray scattering, cryogenic transmission electron microscopy, and viscosity measurements. The surface tension of C12EO6 in 2Cn(Spacer) NTf2 with oxygen-containing spacers increased with increasing concentration of C12EO6, becoming close to that of C12EO6 alone, indicating that the amphiphilic ionic liquid adsorbed at the interface was replaced with CxEO6. In contrast, both 2Cn(Spacer) NTf2 with nitrogen-containing spacers and nonionic surfactants remained adsorbed at the interface at high concentrations. In the bulk, it was found that 2Cn(Spacer) NTf2 formed layer structures, in which the spacing depended on the alkyl chain length of CxEO6. These insights are expected to advance the practical applications of amphiphilic ionic liquids such as ion permeation, drug solubilization, and energy delivery systems.

Quaternary-Ammonium-Salt-Type Amphiphilic Ionic Liquids

2020 ◽  
Vol 93 (3) ◽  
pp. 91-98
Author(s):  
Risa KAWAI ◽  
Shiho YADA ◽  
Tomokazu YOSHIMURA
Keyword(s):  
Ionic Liquids ◽  
Ammonium Salt ◽  
Quaternary Ammonium ◽  
Quaternary Ammonium Salt
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