Picosecond dynamics and microheterogenity of water+dioxane mixtures.
Dielectric spectra from 200 MHz up to 3 THz were determined to study the fast dynamics of dilute water+1,4-dioxane. epsilon(nu) could be fitted by a collision induced oscillator at high frequencies plus two Debye relaxations in the microwave region. Isotope substitution was used to assign water and dioxane modes. The presence of the cooperative hydrogen-bond network relaxation down to a water mole fraction of 0.005 suggests a microheterogeneous structure of the mixtures even at low water content. The collision mode of dioxane at approximately 2 THz grows upon water addition, revealing the presence of H2O molecules in dioxane-rich domains.
Schrödle
Simon
S
Institute of Physical and Theoretical Chemistry, Universität Regensburg, D-93040 Regensburg, Germany.
Fischer
Bernd
B
Helm
Hanspeter
H
Buchner
Richard
R
D004146:Dioxanes / Q000737:chemistry*; D004583:Electrons; D007201:Indicator Dilution Techniques; D012996:Solutions; D013057:Spectrum Analysis; D013696:Temperature; D013997:Time Factors; D014867:Water / Q000737:chemistry*
D004146:Dioxanes; D012996:Solutions; D014867:Water; C025223:1,4-dioxane