Abstract
From isothermal thermogravimetric analysis, the dehydration behaviour of different particle size fractions of trehalose dihydrate was investigated between 40 and 90°C. The dehydration rate increased with temperature in accord with the Arrhenius relationship between 40 and 60°C enabling activation energies ( E a) for the dehydration to be calculated for the three particle size fractions studied. The activation energy was found to decrease with particle size with a <45 μm particle size fraction having an E a approximately 13 kJ/mol lower than a >425 μm sample. It is suggested that the smaller particles contain more lattice defects enabling the water to be released more easily, accounting for the lower E a. Between 70 and 90°C, the dehydration data showed a non-Arrhenius type behaviour suggesting the mechanism of dehydration changed over this temperature range, in agreement with previous studies.
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