Moisture Uptake Behavior, Antibacterial Property, and Heat of Sorption of Nano Silver-Loaded Calcium Alginate Films

Abstract

This work describes preparation, characterization, and a moisture uptake study of silver nanoparticle-loaded calcium alginate films. The equilibrium uptake data was interpreted by various isotherm models. In the lower moisture content range of 0.02 to 0.06, the enthalpy of sorption (ΔH) and differential entropy (ΔS) were 25.25 to 4.82 kJ/mol and 0.07521 to 0.01371 kJ/mol/K, respectively. There was fair correlation between ΔH and ΔS values. Finally, the higher value of isokinetic temperature, T_B (i.e., 336.77), as compared to the harmonic mean temperature, T_m (i.e., 302.05), indicated that moisture uptake mechanism was enthalpy driven.

Keywords:

• Alginate
• E. coli
• GAB isotherm
• halsey model
• oswin model
• silver nanoparticles

Acknowledgment

The authors would like to thank Dr. O. P. Sharma, Head of the Chemistry Department, Govt. Model Science College, Jabalpur, India, for providing experimental facilities.