Add time:07/11/2019         Source:sciencedirect.com

The rotational re-orientations times of the 3-(1,3-benzothiazol-2-yl)-7-(diethylamino) chromen-2-one (3-BDC) dye molecule have been examined in ethanol and octanol solvents when macroscopic solvent viscosity parameter is varied by varying the temperature, by employing the steady-state fluorescence depolarisation and Time-Correlated Single Photon Counting (TCSPC) techniques. Experimental observation shows that 3-BDC probe is experiencing higher friction in octanol compared to ethanol and rotates slower by a factor of range 3.5–5.93. The hydrodynamic Stokes Einstein's Debye theory (SED) with a stick, slip boundary conditions parameters, Quasi-hydrodynamic models (Dote-Kivelson-Schwartz and Geirer-Wirtz) were used to determine mechanical friction and found an interesting towards super slip trend. The Dielectric frictional theories of point dipole, Nee-Zwanzig and van der Zwan-Hynes both models fail to describe experimentally observe dielectric friction trends. Evidently, both hydrodynamic and dielectric models failed to explain the examined behavior, even in the qualitative way in alcohols.

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