Superadaptability of Water Molecules to Hydrophobic Nanoenvironments
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.
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