Yield Stress Dependent Foaming of Edible Crystal-Melt Suspensions,Crystal Growth & Design

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Yield Stress Dependent Foaming of Edible Crystal-Melt Suspensions
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2020-01-16 , DOI: 10.1021/acs.cgd.9b01558
Kim Mishra ₁ , Damien Dufour ₁ , Erich J. Windhab ₁

Affiliation

Crystal-melt suspensions (CMSs) are yield stress shear thinning fluids in which crystal network formation is responsible for the appearance of a yield stress. This study investigates the influence of crystal concentration and morphology on the yield stress of CMSs made from palm kernel oil (PKO) and aims to understand gas bubble stabilization in such systems. Crystallization in laminar flow depends on shear; thus, different shear rates were applied to produce PKO CMSs. With increasing shear rate, a higher yield stress at a constant crystal content was found. This behavior is expected to originate from the increased aspect ratio and/or smaller size of crystals or crystal agglomerates formed at higher shear rates. The related influence of crystal network formation on gas bubble stabilization was investigated. Normalized bubble diameters of PKO CMS foams were shown to decrease for an increasing Bingham number approaching a value of 1. We demonstrate hereby that gas bubbles are best stabilized within fat melts by crystal network formation resulting in stable fat microfoams with an adjustable structure–rheology relationship through tailored crystallization and low dissipation membrane microfoaming.

中文翻译：

可食用结晶熔体悬浮液的屈服应力依赖性发泡

晶体熔体悬浮液（CMS）是屈服应力剪切稀化流体，其中晶体网络的形成负责产生屈服应力。这项研究调查了晶体浓度和形态对棕榈仁油（PKO）制成的CMS屈服应力的影响，旨在了解此类系统中的气泡稳定性。层流中的结晶取决于剪切力。因此，采用了不同的剪切速率来生产PKO CMS。随着剪切速率的增加，在恒定的晶体含量下发现了更高的屈服应力。预期该行为源自纵横比增加和/或以较高剪切速率形成的晶体或晶体附聚物的尺寸较小。研究了晶体网络形成对气泡稳定化的相关影响。

更新日期：2020-01-16

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