Total Internal Reflectance-Infrared Structural Studies on Tensile Water Formation during Evaporation from Nanopores

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• 作者：Nadine Szabó ; Christian T&ouml ; tzke ; Helmut Tributsch
• 刊名：Journal of Physical Chemistry C
• 出版年：2008
• 出版时间：April 24, 2008
• 年：2008
• 卷：112
• 期：16
• 页码：6313 - 6318
• 全文大小：182K
• 年卷期：v.112,no.16(April 24, 2008)
• ISSN：1932-7455

文摘

Attenuated total reflectance (ATR) infrared spectroscopy of water evaporating from within a TiO₂ nanolayerwith pores of a mean diameter of 23 nm is applied to detect the transition to the tensile state where watermolecules are stretched. It is seen how the concentration of the strongly H-bonded (network) water population,measured within the OH-stretching band, is strongly increasing at the expense of the medium (intermediate)H-bonded population. This observation suggests that water molecules exposed to tensile stress (innanoenvironments) get involved in additional H-bonding, generating a sigmoid (autocatalytic) growth of thenetwork water population. Such a feedback mechanism is related to known molecular electronic propertiesand to irreversible thermodynamic concepts of water. Reference is made to the solar powered water ascentin trees, where this phenomenon of tensile water has evolved into a working technology.