(46e) Superadaptability of Water Molecules to Hydrophobic Nanoenvironments

Superadaptability of Water Molecules to Hydrophobic Nanoenvironments

Katsumi Kaneko

Center for Energy and Environmental Science, Shinshu University, Nagano, 380-8553, Japan

The interaction of water with solid surfaces is one of importance research issues from fundamental science and technology, although it has been studied for a long time. When we drop a water droplet on the compressed disk plate of hydrophobic carbons having nanoscale pores, the water droplet forms a stable hemisphere. This indicates that the porous carbon-packed surface is rather hydrophobic. It is well-known that water vapor begins to be adsorbed suddenly on nanoporous carbons of fewer amounts of surface oxygen groups and hydrophobic zeolites such as AlPO₄-5. The behavior can be phenomenologically described by the transformation of hydrophobic surface to hydrophilic surface¹; we need to understand that water molecules can adapt to chemically unfavorable nanoenvironments through varying the intermolecular structure biomimically[1-3].  However, this quasi transformation does not occur on carbon aerogels having large mesopores[4-6]. The dependence of this quasi transformation on the pore size may be studied. Also we need to understand the contribution of edge carbons to water adsorption[7].

References

[1] Miyawaki, J.,  Kanda, T.,  Kaneko, K. 2001 Langmuir, 17 (2001) 664.

[2] Ohba, T., Kanoh, H., Kaneko, K. 2004  J. Am. Chem. Soc. 126, 1560.

[3] Kaneko,K. 2015,  Nature Chem. 7, 194.

[4] Hanzawa, Y., Kaneko, K. 1997 Langmuir13 (1997) 5802.

[5] Thommes, M., Morell, J., Cychosz, K.A., Fröba, M., 2013 Langmuir29, 14893.

[6] Zoraida Pina-Salazar, E., Kaneko, K. Colloid Interface Sci. Comm. To be submitted.

[7] Asai, M., Ohba, T., Iwanaga, T., Kanoh, H., Endo, M., Campos-Delgado, J.,  Terrones, M., Nakai, K.,Kaneko, K. 2011 J. Am. Chem. Soc. 133,14880.