Turton, D.A. and Hunger, J. and Stoppa, A. and Thoman, A. and Candelaresi, G. and Hefter, Glenn and Walther, M. and Buchner, Richard and Wynne, K. (2011) Rattling the cage: Micro- to mesoscopic structure in liquids as simple as argon and as complicated as water. Journal of Molecular Liquids 159 (1), pp. 2-8.
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A review. The water mol. has the convenient property that its mol. polarizability tensor is nearly isotropic while its dipole moment is large. As a result, the low-frequency anisotropic Raman spectrum of liq. water is mostly collision-induced and therefore reports primarily translational motions while the far-IR (terahertz) and dielec. spectrum is dominated by rotational modes. Atomic and globular-mol. liqs. have a zero dipole moment as well as an isotropic polarizability tensor. These spectrum-simplifying properties were exploited in a study of a no. of liqs. and solns. using ultrafast optical Kerr-effect (OKE) spectroscopy combined with dielec. relaxation spectroscopy (DRS), terahertz time-domain spectroscopy (THz-TDS), and terahertz field-induced second-harmonic generation (TFISH) spectroscopy. For room-temp. ionic liqs. (RTILs), liq. water, aq. salt solns., noble gas liqs., and globular-mol. liqs. it was found that, in each case, surprising structure and/or inhomogeneity is obsd., ranging from mesoscopic clustering in RTILs to stretched-exponential dynamics in the noble gas liqs. For aq. electrolyte solns. it is shown that the viscosity, normally described by the Jones-Dole expression, can be explained in terms of a jamming transition, a concept borrowed from soft condensed matter studies of glass transitions in colloidal suspensions.
|Institutions:||Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > PD Dr. Richard Buchner|
|Keywords:||argon water microscopic mesoscopic structure review|
|Subjects:||500 Science > 540 Chemistry & allied sciences|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||08 Jun 2012 13:00|
|Last Modified:||08 Jun 2012 13:00|
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