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Water Vapor Adsorption Isotherms of Agar‐Based Nanocomposite Films
Author(s) -
Rhim JongWhan
Publication year - 2011
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1750-3841.2011.02378.x
Subject(s) - montmorillonite , nanocomposite , adsorption , monolayer , materials science , chemical engineering , water vapor , agar , polymer chemistry , composite material , chemistry , nanotechnology , organic chemistry , geology , paleontology , bacteria , engineering
Adsorption isotherms of agar and agar/clay nanocomposite films prepared with different types of nanoclays, that is, a natural montmorillonite (Cloisite Na + ) and 2 organically modified montmorillonites (Cloisite 30B and Cloisite 20A), were determined at 3 different temperatures (10, 25, and 40 °C). The water vapor adsorption behavior of the nanocomposite films was found to be greatly influenced with the type of clay. The Guggenheim–Anderson–de Boer (GAB) isotherm model parameters were estimated by using both polynomial regression and nonlinear regression methods and it was found that the GAB model fitted adequately for describing experimental adsorption isotherm data for the film samples. The monolayer moisture content ( m o ) of the film samples was also greatly affected by the type of nanoclay used, that is, m o of nanocomposite films was significantly lower than that of the neat agar film. Nanocomposite films prepared with hydrophobic nanoclays (Cloisite 30B and Cloisite 20A) exhibited lower m o values than those prepared with hydrophilic nanoclay (Cloisite Na + ).