• Are water-xylitol mixtures heterogeneous? An investigation employing composition and temperature dependent dielectric relaxation and time-resolved fluorescence measurements

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      https://www.ias.ac.in/article/fulltext/jcsc/131/05/0043

    • Keywords

       

      Xylitol; water; heterogeneity; dielectric relaxation; fluorescence

    • Abstract

       

      Aqueous xylitol solutions at six different concentrations were studied employing dielectric relaxation (DR) and time-resolved fluorescence (TRF) measurements in the temperature range 295–323 K. The focus was to explore the solution heterogeneity aspect via monitoring the viscosity coupling of the average relaxation rates at various temperatures. TRF measurements were done using both hydrophobic and hydrophilic probes to explore the preferences, if any, for solute locations in these binary mixtures. Energy-selective population excitations and the corresponding fluorescence emissions did not suggest any significant spatial heterogeneity in solution structure within the lifetimes of these probes. DRmeasurements and TRF experiments indicated mild deviations from the hydrodynamic viscosity dependence of themeasured relaxation rates. All these suggestmild spatiotemporal heterogeneity for these water-xylitol mixtures in the temperature range considered. In addition, DRtimescales appear to originate from reorientational and H-bond relaxation dynamics, excluding the possibilityof full molecular rotations

    • Author Affiliations

       

      EJAJ TARIF1 KALLOL MUKHERJEE1 ANJAN BARMAN2 RANJIT BISWAS1

      1. Chemical, Biological and Macromolecular Sciences (CBMS), S N Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata 700 106, West Bengal, India
      2. Condensed Matter Physics and Materials Science, S N Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata 700 106, West Bengal, India
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