Activation energies of water vaporization from the bulk and from laponite, montmorillonite, and chitosan powders

作者：Prado J Rachel; Vyazovkin Sergey^*

来源：Thermochimica Acta, 2011, 524(1-2): 197-201.

DOI：10.1016/j.tca.2011.06.005

• Activation energy
• Kinetics
• Vaporization

DSC has been employed to measure the vaporization kinetics of water from the bulk and from powders of laponite, Na-montmorillonite, and chitosan. The application of isoconversional kinetic analysis to the vaporization rate data has yielded the following average effective activation energies: 43.80 +/- 0.03,47.9 +/- 0.4, 52.6 +/- 0.9,and 56.2 +/- 0.2 kJ mol(-1) for vaporization from the bulk, laponite, sodium montmorillonite, and chitosan, respectively. A moderate increase in the activation energy is comparable to the hydrogen bond energy and can be explained by interaction between water and solid surfaces.

• 出版日期2011-9-20