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Article Dans Une Revue Thermochimica Acta Année : 2011

Influence of water vapor pressure on the induction period during Li2SO4*H2O single crystals dehydration

Résumé

The dehydration of Li2SO4*H2O single crystals at 80 °C has been studied by means of both isothermal thermogravimetry at 2.6, 3.6 and 4.6 hPa of water vapor and environmental scanning electron microscope. Thermogravimetric experiments allowed the determination of induction periods. Distributions of these isoconversion induction periods for a large number of single crystals showed that increasing the water vapor pressure produced a longer induction period. Moreover, the shape of the distributions of the induction periods over a large number of single crystals changed from one mode at 2.6 hPa to two modes at 3.6 and 4.6 hPa. Using an environmental scanning electron microscope, this result could be attributed to differences in nucleation rates at edges and faces of the single crystals. Highlights ► We study nucleation process during thermal decomposition of solid. ► 2 nucleation modes are considered as nuclei appear on crystal edges and faces. ► Nucleation on the edges is faster than on the faces. ► When the water vapor pressure is increased, nucleation on faces is delayed. ► Nucleation on edges withdraws when water vapor pressure is increased.
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Dates et versions

hal-00603689 , version 1 (27-06-2011)

Identifiants

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Loïc Favergeon, Michèle Pijolat. Influence of water vapor pressure on the induction period during Li2SO4*H2O single crystals dehydration. Thermochimica Acta, 2011, 521 (1-2), pp.155-160. ⟨10.1016/j.tca.2011.04.018⟩. ⟨hal-00603689⟩
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