title: Structural change of water with solutes and temperature up to 100 degrees C in aqueous solutions as revealed by attenuated total reflectance infrared spectroscopy.
abstract: The attenuated total reflectance infrared (ATR-IR) spectra of several aqueous solutions have been measured by using a newly developed heatable rod-type ATR cell. The OH stretching bands showed systematic change with increasing solute concentrations and these changes can be explained by four different OH components based on curve-fitting results. NaCl solutions show longer H-bond distance character, while carbonate solutions present shorter ones. The Na2CO3 1 M solution conserves this shorter H-bond nature up to 100 degrees C. On the other hand, the loose nature of NaCl solutions becomes less pronounced at higher temperatures because of the dissociation of pure water clusters. These in situ observations of water structures are generally in agreement with the expected nature of fluids within the earth.
authors.affiliation: Interactive Research Center of Science, Tokyo Institute of Technology, O-okayama 2-12-1, Meguro, Tokyo 152-8551, Japan.
authors.forename: Kaori
authors.initials: K
authors.lastname: Masuda
authors.forename: Taishiro
authors.initials: T
authors.lastname: Haramaki
authors.forename: Satoru
authors.initials: S
authors.lastname: Nakashima
authors.forename: Bertrand
authors.initials: B
authors.lastname: Habert
authors.forename: Isabelle
authors.initials: I
authors.lastname: Martinez
authors.forename: Seiichi
authors.initials: S
authors.lastname: Kashiwabara
mesh_terms: D002254:Carbonates / Q000737:chemistry*; D006358:Hot Temperature; D008968:Molecular Conformation; D012542:Scattering, Radiation; D017693:Sodium Bicarbonate / Q000737:chemistry*; D012965:Sodium Chloride / Q000737:chemistry*; D012995:Solubility; D012996:Solutions; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods*; D014867:Water / Q000737:chemistry*
chemical_list: D002254:Carbonates; D012996:Solutions; D014867:Water; D012965:Sodium Chloride; C005686:sodium carbonate; D017693:Sodium Bicarbonate