Static and transport properties of alkyltrimethylammonium cation-based room-temperature ionic liquids.
We have measured physicochemical properties of five alkyltrimethylammonium cation-based room-temperature ionic liquids and compared them with those obtained from computational methods. We have found that static properties (density and refractive index) and transport properties (ionic conductivity, self-diffusion coefficient, and viscosity) of these ionic liquids show close relations with the length of the alkyl chain. In particular, static properties obtained by experimental methods exhibit a trend complementary to that by computational methods (refractive index ∝ [polarizability/molar volume]). Moreover, the self-diffusion coefficient obtained by molecular dynamics (MD) simulation was consistent with the data obtained by the pulsed-gradient spin-echo nuclear magnetic resonance technique, which suggests that computational methods can be supplemental tools to predict physicochemical properties of room-temperature ionic liquids.
Materials Science Research Laboratory, Central Research Institute of Electric Power Industry (CRIEPI) , 2-11-1, Iwado-kita, Komae, Tokyo 201-8511, Japan.
Shiro
S
Seki
Seiji
S
Tsuzuki
Kikuko
K
Hayamizu
Nobuyuki
N
Serizawa
Shimpei
S
Ono
Katsuhito
K
Takei
Hiroyuki
H
Doi
Yasuhiro
Y
Umebayashi