Abstract
We report the use of UV-Vis absorbance spectroscopy in determining
thermodynamic properties of materials based on their absorbance in the
visible region of the electromagnetic spectrum. Rhodamine B (RhB) dye
which has always been considered to be a non-volatile material, was
chosen for the validation of this method because of its well-defined and
strong absorbance in this region. Continuous films of RhB suitable for
absorbance spectroscopic study were prepared by spin coating in a 0.2 M
ethanol solution to determine the sublimation rates and the activation
energy of RhB in the temperature range 65-100 A degrees C. For
comparison, the same thermodynamic parameters of powder RhB were also
determined using thermogravimetric analysis, at higher temperatures
(100-180 A degrees C). The sublimation of RhB was determined to be a
first-order process by both methods. The activation energies of
sublimation calculated by both techniques are in very good agreement.
However, the sublimation rates c
| Original language | English |
|---|---|
| Pages (from-to) | 519-523 |
| Journal | Journal of Thermal Analysis and Calorimetry |
| State | Published - Aug 2013 |
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Hikal, W. M., Paden, J. T., Bhattacharia, S., & Weeks, B. (2013). Thermodynamic parameters of Rhodamine B in powder and nanofilms forms. Journal of Thermal Analysis and Calorimetry, 519-523.