Thermodynamic parameters of Rhodamine B in powder and nanofilms forms

Rapid Estimation of Thermodynamic Parameters and Vapor Pressures of Volatile Materials at Nanoscale

“…These values agree with the values determined isothermally (E a = 99.6 AE 5 kJmol À1 and Log f = 16.57). [11] In addition, the activation energy of sublimation is in agreement with the values determined isothermally using QCM [8] and the Knudsen effusion method. [24] This, again, confirmed the high efficiency and the ability of absorbance spectroscopy to estimate these thermodynamic parameters non-isothermally, yielding accurate results without the need for modeling.…”

“…The decrease in absorbance is not significant before 50 8C, as it has been the case in a previously reported isothermal study. [11] Three different films of the same thickness, as indicated by their initial absorbance at room temperature, were used to collect different data sets. Excellent agreement in the behavior (similar to that shown in Figure 4) of the three films was also observed.…”

“…[11][12][13] This method was shown to be the simplest and most accurate model-free method in determining thermodynamic parameters at nanoscale to date. [11][12][13] This method was shown to be the simplest and most accurate model-free method in determining thermodynamic parameters at nanoscale to date.…”

“…We have recently reported the first use of optical absorbance spectroscopy in determining Arrhenius parameters as well as vapor pressures of nanofilms of materials isothermally. [11][12][13] This method was shown to be the simplest and most accurate model-free method in determining thermodynamic parameters at nanoscale to date. However, in spite of being much faster than other techniques (up to hours), isothermal absorbance spectroscopy is still a time-consuming method and a relatively faster procedure would be of great impact.…”