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Lamellar/Disorder Phase Transition in a Mixture of Water/2,6-Dimethylpyridine/Antagonistic Salt

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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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Acknowledgments

The authors are grateful to Prof. Onuki and Dr. Inoue at Kyoto University for valuable discussions. This work was supported by a Grant-in-Aid for Young Scientists B (Grant No. 23750031) and Scientific Research A (Grant No. 23244088) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan.

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Authors and Affiliations

  1. Department of Physics, Ritsumeikan University, Noji-Higashi 1-1-1, Kusatsu, 525-8577, Japan

    K. Sadakane

  2. KENS & CMRC, Institute of Materials Structure Science, High Energy Accelerator Research Organization, 203-1 Shirakata, Tokai, 319-1106, Japan

    H. Endo & H. Seto

  3. Institute for Chemical Research, Kyoto University, Uji, Kyoto, 611-0011, Japan

    K. Nishida

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  1. K. Sadakane
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  2. H. Endo
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  3. K. Nishida
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  4. H. Seto
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Corresponding author

Correspondence to K. Sadakane.

Additional information

The SANS experiments were performed under the approval of the Neutron Program Advisory Committee of Japan (Proposal No. 10622).

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Sadakane, K., Endo, H., Nishida, K. et al. Lamellar/Disorder Phase Transition in a Mixture of Water/2,6-Dimethylpyridine/Antagonistic Salt. J Solution Chem 43, 1722–1731 (2014). https://doi.org/10.1007/s10953-014-0240-x

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  • DOI: https://doi.org/10.1007/s10953-014-0240-x

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