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Thermogravimetric analysis for rapid assessment of moisture diffusivity in polydisperse powder and thin film matrices

Author:
Thirunathan, Praveena, Arnz, Patrik, Husny, Joeska, Gianfrancesco, Alessandro, Perdana, Jimmy
Source:
Food chemistry 2018 v.242 pp. 519-526
ISSN:
0308-8146
Subject:
diffusivity, prediction, rapid methods, temperature, thermogravimetry
Abstract:
Accurate description of moisture diffusivity is key to precisely understand and predict moisture transfer behaviour in a matrix. Unfortunately, measuring moisture diffusivity is not trivial, especially at low moisture values and/or elevated temperatures. This paper presents a novel experimental procedure to accurately measure moisture diffusivity based on thermogravimetric approach. The procedure is capable to measure diffusivity even at elevated temperatures (>70°C) and low moisture values (>1%). Diffusivity was extracted from experimental data based on “regular regime approach”. The approach was tailored to determine diffusivity from thin film and from poly-dispersed powdered samples. Subsequently, measured diffusivity was validated by comparing to available literature data, showing good agreement. Ability of this approach to accurately measure diffusivity at a wider range of temperatures provides better insight on temperature dependency of diffusivity. Thus, this approach can be crucial to ensure good accuracy of moisture transfer description/prediction especially when involving elevated temperatures.
Agid:
5824450