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Prise en compte des propriétés d'interface dans la prédiction de structure de mousses élaborées par battage en continu : Etude de produits modèles

Abstract : The objective of this work was to quantify and model the individual impact of surface properties aside from the equilibrium surface tension on the bubble size of foam produced in an industrial device: surface tension kinetics and viscoelastic interface properties. Interactions with foaming pressure and mixing rate have also been studied. To do so we formulated a range of model products presenting different levels for these interface properties by using various surface active agents. Six surface active agents have been used: whey protein isolate, sodium caseinate, saponin, sucrose ester, potassium cetyl phosphate and SDS. Their concentration have been varied from 0.1% to 1.0% in a solution of glucose syrup. The size, molecular weight and structure differences between these molecules as well as their distinct interactions with the glucose syrup led to products covering a wide range of interface properties in terms of surface tension kinetics and interface rigidity. The bubble sizes obtained after whipping on an instrumented pilot line were linked to the above mentioned bulk properties and the operating conditions. Results highlighted the effect of surface tension kinetics and interface rheology. By using dimensional modelling, we have been able to quantify more precisely their impact. High surface tension rates leed to small bubbles, due to the sharper decrease of surface tension, which facilitates bubble rupture. High interface moduli generate smaller bubbles, which could be due to a lower deformation capacity under strain, and thus a higher propensity to rupture.
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Submitted on : Tuesday, March 29, 2022 - 5:29:54 PM
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  • HAL Id : tel-03623549, version 1

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Eugénie Seguineau de Preval. Prise en compte des propriétés d'interface dans la prédiction de structure de mousses élaborées par battage en continu : Etude de produits modèles. Ingénierie des aliments. AgroParisTech, 2014. Français. ⟨NNT : 2014AGPT0051⟩. ⟨tel-03623549⟩

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