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Titre :
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Physical gelation under shear for gelatin gels
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Auteurs :
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W. De Carvalho ;
M. Djabourov ;
CNRS PARIS LABORATOIRE DE PHYSIQUE ET MECANIQUE DES MILIEUX HETEROGENES
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Type de document :
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article/chapitre/communication
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Année de publication :
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1997
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Format :
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p. 591-609
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Langues:
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= Anglais
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Catégories :
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CHIMIE
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Mots-clés:
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POLYMERE
;
TECHNIQUE DE SEPARATION
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Résumé :
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This investigation defines the flowing conditions which either allow or impede gel formation. In particular, a critical shear rate related to the gelation temperature and gelatin concentration, is identified which separates the two regimes. A microscopoc model is proposed, based on the analysis of flow curves and dynamic measurements which describes the structure of the gelling solution : microgel particles grow to a maximum size which depends on the flow. When the volume fraction of particles is high enough, percolation between particles occurs suddenly and a yield stress fluid is formed (particulate gel). The differences between gels made in quiescent conditions and gels made under flow are underlined.
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Source :
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Rheologica acta, vol. 36, n°6
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