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Hydrogen bond dynamics and water structure in glucose-water solutions by depolarized Rayleigh scattering and low-frequency Raman spectroscopy
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10.1063/1.2748405
/content/aip/journal/jcp/127/2/10.1063/1.2748405
http://aip.metastore.ingenta.com/content/aip/journal/jcp/127/2/10.1063/1.2748405
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

DRS spectrum of water at (gray line) together with the best fit result (thick black line) with the instrumental function (dashed line) and the two Lorentzian components (thin black lines).

Image of FIG. 2.
FIG. 2.

Comparison of the relaxation time characterizing the main relaxation process detected in different DRS experiments. The average relaxation time obtained by the OKE measurements of Torre et al. (Ref. 55) is also reported. A mean relaxation time value is calculated as considering the and parameters obtained by the authors using a stretched exponential function to reproduce the nuclear Kerr response (Ref. 55).

Image of FIG. 3.
FIG. 3.

Arrhenius plot of the experimental H-bond time constant (circles) together with theoretical values reported in different MD studies: Teixeira et al. (Ref. 43) (empty squares), Chowdhuri and Chandra (Ref. 60) with an angle definition threshold (up triangles) and (down triangles), Starr et al. (Ref. 59) (filled squares). Corresponding activation energies are between 9.3 and .

Image of FIG. 4.
FIG. 4.

DRS spectra of glucose-water solutions measured at different solute molar fractions and . The spectra are rescaled to the higher frequency tail of the DRS signal around .

Image of FIG. 5.
FIG. 5.

DRS spectrum of a glucose-water solution, and (gray line) together with the best fit result (thick black line) with the three Lorentzian components (thin black lines).

Image of FIG. 6.
FIG. 6.

The water relaxation time in glucose-water solutions obtained at different glucose molar ratio with the corresponding linear fit (dashed line). A linear dependence is found until and leads to a slope of 12.

Image of FIG. 7.
FIG. 7.

Temperature dependence of the of the dynamical susceptibility of pure water from . The spectra are normalized on the maximum of the band. The inset shows the frequency region in more detail. The two main components are assigned to the bending and stretching intermolecular modes. Arrows indicate the direction of spectral variations observed with temperature rising. Changes around essentially depends on the water relaxation process.

Image of FIG. 8.
FIG. 8.

(A) The dynamical susceptibility of pure water and glucose-water solutions at different molar ratios and . The spectra are normalized on the maximum of the band. (B) Detail of the spectral region assigned to the water contributions. Arrows indicate the direction of spectral variations observed at higher glucose concentrations.

Image of FIG. 9.
FIG. 9.

The dynamical susceptibility of pure water at is compared with that of a glucose-water solution at corresponding to a glucose molar ratio . The spectra are normalized on the maximum of the band.

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/content/aip/journal/jcp/127/2/10.1063/1.2748405
2007-07-12
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Hydrogen bond dynamics and water structure in glucose-water solutions by depolarized Rayleigh scattering and low-frequency Raman spectroscopy
http://aip.metastore.ingenta.com/content/aip/journal/jcp/127/2/10.1063/1.2748405
10.1063/1.2748405
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