Analysis of network formation and long-term stability in silica nanoparticle stabilized emulsions†,Soft Matter

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Analysis of network formation and long-term stability in silica nanoparticle stabilized emulsions†
Soft Matter ( IF 2.9 ) Pub Date : 2018-02-26 00:00:00 , DOI: 10.1039/c7sm02457f
Maziar Derakhshandeh _{1,

2,

3} , Brandy K Pilapil _{1,

2,

3} , Ben Workman _{1,

2,

3} , Milana Trifkovic _{1,

2,

3} , Steven L Bryant _{1,

2,

3}

Affiliation

Emulsions are widely used in industrial applications, including in food sciences, cosmetics, and enhanced oil recovery. For these industries, an in depth understanding of the stability and rheological properties of emulsions under both static and dynamic conditions is vital to their successful application. Presented here is a thorough assessment of a model nanoparticle (NP) stabilized dodecane-in-water emulsion as a route to improved understanding of the relationship between NP properties, microstructure and droplet–droplet interactions on the stability and rheological properties of emulsions. Emulsions are obtained here with low NP loadings without the need for added electrolyte through the use of an optimized silica NP (SNP) surface modification procedure. The prepared emulsions were characterized via optical microscopy, cryo-scanning electron microscopy (cryo-SEM), zeta potential analysis and laser scanning confocal microscopy (LSCM), enabling quantification of the emulsion droplet size, SNP interfacial coverage/morphology and surface charge. The correlation of these properties with the rheology of the emulsions is investigated through small amplitude oscillatory shear experiments which provide significant insight into the origins of the emulsions’ rheological behavior and their stability. In addition, long-term stability, droplet–droplet network formation and microstructural evolution are found to be readily detectable shortly after preparation through measured progression of the emulsion's rheological properties.

中文翻译：

二氧化硅纳米粒子稳定的乳液的网络形成和长期稳定性分析†

乳液广泛用于工业应用，包括食品科学，化妆品和提高采油率。对于这些行业，深入了解乳液在静态和动态条件下的稳定性和流变特性对它们的成功应用至关重要。这里介绍的是对模型纳米颗粒（NP）稳定的十二烷在水中的乳液的全面评估，以此为增进对NP性能，微观结构以及液滴与液滴相互作用对乳液稳定性和流变性能之间关系的理解的途径。在这里，通过使用优化的二氧化硅NP（SNP）表面改性程序，可以以较低的NP含量获得乳液，而无需添加电解质。制备的乳液通过光学显微镜，低温扫描电子显微镜（cryo-SEM），ζ电位分析和激光扫描共聚焦显微镜（LSCM），可对乳剂液滴尺寸，SNP界面覆盖/形态和表面电荷进行定量分析。通过小振幅振荡剪切实验研究了这些性质与乳液的流变性的相关性，这些实验为乳液的流变行为的起源及其稳定性提供了重要的见识。另外，在制备后不久，通过测量乳液的流变特性进展，可以很容易地检测到长期稳定性，液滴-液滴网络的形成和微观结构的演变。

更新日期：2018-02-26

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