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Lamellar/Disorder Phase Transition in a Mixture of Water/2,6-Dimethylpyridine/Antagonistic Salt
Authors:K Sadakane  H Endo  K Nishida  H Seto
Institution:1. Department of Physics, Ritsumeikan University, Noji-Higashi 1-1-1, Kusatsu, 525-8577, Japan
2. KENS & CMRC, Institute of Materials Structure Science, High Energy Accelerator Research Organization, 203-1 Shirakata, Tokai, 319-1106, Japan
3. Institute for Chemical Research, Kyoto University, Uji, Kyoto, 611-0011, Japan
Abstract:The effects of adding an antagonistic salt, sodium tetraphenylborate ( \(\hbox {NaBPh}_4\) ), to a binary mixture of deuterated water and 2,6-dimethylpyridine were investigated by visual inspection, optical microscopy, and small-angle neutron scattering. With increasing salt concentration, the two-phase region shrinks. When the concentration of \(\hbox {NaBPh}_4\) is \(85\hbox { mmol}{\cdot} \hbox {L}^{-1}\) , a temperature-induced lamellar/disorder phase transition is observed at 338 K. These trends are similar to those observed for a mixture of water/3-methylpyridine/ \(\hbox {NaBPh}_4\) (Sadakane et al., Phys. Rev. Lett. 103, 167803 (2009)).
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