植松 祐輝 博士（九州大学 化学科）平成30年12月19日
Kochi University of Technology
Unified Quantum Device Laboratory Seminar
⭐Speaker: Dr. Yuki Uematsu (Chemical Physics and Biophysics Group, Kyushu University)
⭐Date&Time : 12 /19 /2018 (Wed) 14:40-16:10
⭐Place: Kami Campus, B108
⭐Title: Jones-Ray effect and the negative zeta potential of the air-water interface
The surface tension of electrolytes exhibits a characteristic minimum at the concentration of approximately 1mM, which is known as the Jones-Ray effect. The reason for the Jones-Ray effect has not been fully understood, and we propose that charged impurities induce the Jones-Ray effect. We show that the thermodynamical model quantitatively reproduces the minima of the previous experiments using different levels of water purity . We also perform the experiment of intentional addition of ionic surfactants, and the agreement of theory and experiment is perfect . In the end, we discuss the relation between the negative zeta potential of hydrophobic surfaces and the impurity effect .
. YU, D.J. Bonthuis, R.R. Netz, J. Phys. Chem. Lett. 9, 189–193 (2018).
. YU, K. Chida, H. Matsubara, Colloid and Interfacial Science Communications 27, 45-48 (2018).
. YU, D.J. Bonthuis, R.R. Netz, Current Opinion in Electrochemistry (2018).
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