Exploring effects of polymeric stabiliser molecular weight and concentration on emulsion production via stirred cell membrane emulsification
Exploring effects of polymeric stabiliser molecular weight and concentration on emulsion production via stirred cell membrane emulsification
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探索聚合物稳定剂分子量和浓度对搅拌细胞膜乳化乳液生产的影响
DOI：
10.1039/d3py00948c
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发表时间：
2023
影响因子：
4.6
通讯作者：
Manga M
中科院分区：
文献类型：
--
作者：
Manga M
聚合物乳化剂扩散速率和液滴形成动力学的影响是膜乳化过程中有效控制乳滴大小和稳定性的关键。由于乳液形成机理的低能性质，以及膜乳化体系固有的乳化剂扩散的依赖性，预计聚合物稳定剂的相对分子质量将在所生成的乳液中发挥重要作用。通过不同浓度和不同相对分子质量的聚乙烯醇聚合物的膜乳化，在水乳状液中形成十二烷。随着时间的推移，通过激光衍射和光学显微镜对乳剂的属性进行了量化。然后，通过悬滴张力计，将这些数据与不同浓度下不同分子量的聚合物的扩散时间相关联。研究发现，聚合物稳定剂的相对分子质量和随后向界面的扩散对液滴的尺寸、分散性和稳定性有显著影响。较大的聚合物稳定剂扩散到界面的速度较慢，导致高度稳定的较大液滴，而较小的聚合物迅速吸附到界面上，但提供有限的空间稳定，从而导致显著的液滴合并。观察到将高分子聚合物和低分子聚合物组合作为稳定剂，可以得到分散度低、大小可控的乳液，以满足极低聚合物浓度的要求。
The impact of polymer emulsifier diffusion rates and droplet formation kinetics are critical for effective control of emulsion droplet size and stability during the membrane emulsification process. It is expected that the molecular weight of a polymer stabiliser will play a significant role in the resultant emulsion due to the low energy nature of the emulsion formation mechanism and dependence on emulsifier diffusion inherent in a membrane emulsification system. Dodecane in water emulsions were formed via membrane emulsification at various concentrations and molecular weights of a polyvinyl alcohol polymer. Emulsion attributes were quantified via laser diffraction and optical microscopy over time. These data were then related to the diffusion time of polymers of different molecular weight at various concentrations via pendent droplet tensiometry. It was found that molecular weight of a polymeric stabiliser and subsequent diffusion to the interface have a significant impact on droplet size, dispersity and stability. Larger polymeric stabilisers were slower to diffuse to the interface, resulting in highly stable larger droplets, while smaller polymers quickly adsorbed to the interface but offered limited steric stabilisation and thus resulted in significant droplet coalescence. Combination of both high and low molecular weight polymers as stabilisers was observed to result in emulsions of low dispersity and controllable sizes for extremely low concentration of polymer.
膜乳化过程中传质和界面膨胀速率对液滴尺寸的影响
DOI：
--
发表时间：
2005
期刊：
影响因子：
--
作者：
M. Rayner;G. Trägårdh;C. Trägårdh
通讯作者：
C. Trägårdh
疏水化金属膜的油包水乳液及膜乳化中动态界面张力的表征
DOI：
--
发表时间：
2017
期刊：
影响因子：
--
作者：
P. S. Silva;S. Morelli;M. Dragosavac;V. Starov;R. Holdich
通讯作者：
R. Holdich
影响因子：
4.2
作者：
Kosvintsev, SR;Gasparini, G;Stillwell, MT
通讯作者：
Stillwell, MT