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Rheology of water-in-water emulsions: Caseinate-pectin and caseinate-alginate systems.
Carbohydrate Polymers ( IF 11.2 ) Pub Date : 2020-07-23 , DOI: 10.1016/j.carbpol.2020.116799
Alicia Maestro 1 , José M Gutiérrez 1 , Esther Santamaría 1 , Carmen González 1
Affiliation  

Conventional models developed for oil-water emulsions do not fit viscosity of caseinate-pectin and caseinate-alginate water-in-water emulsions, which is always lower than predicted, except for high viscosities of disperse phase. These models do not consider strong deformations, prevented by the high interfacial tension of oil-water interphases. The ultra-low interfacial tension of water-in-water emulsions facilitates the creation of interphase and very elongated droplets. Capron model considers interfacial tension, fitting results when the dispersed phase is the most viscous, but, for other cases, lower experimental values are obtained related to the shear-induced stratification. Even values below the stratification model are observed for some samples, related to the influence of the interphase in the viscosity of the emulsion. A model that takes into account the presence of a relatively thick interphase poor in both polymers is proposed. Intermediate structures between highly elongated and stratified fluids, with influence of interphase viscosity could explain results.



中文翻译:

水包水乳液的流变学:酪蛋白酸酯-果胶和酪蛋白酸酯-海藻酸酯体系。

针对油水乳液开发的常规模型不适合酪蛋白酸盐-果胶和酪蛋白酸盐-藻酸盐水包水乳液的粘度,该粘度始终低于预期值,但分散相的粘度较高。这些模型没有考虑由油水界面的高界面张力阻止的强烈变形。水包水乳液的超低界面张力有助于形成相间和非常细长的液滴。Capron模型考虑了界面张力,在分散相最粘稠时拟合结果,但在其他情况下,与剪切诱导分层相关的实验值较低。对于一些样品,甚至观察到低于分层模型的值,这与相间对乳液粘度的影响有关。提出了一种模型,该模型考虑了两种聚合物中相对较厚的相差的存在。高度伸长和分层流体之间的中间结构,受相间粘度的影响,可以解释结果。

更新日期:2020-07-31
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