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首页> 外文期刊>Colloids and Interfaces >Salt Effects on Formation and Stability of Colloidal Gas Aphrons Produced by Anionic and Zwitterionic Surfactants in Xanthan Gum Solution
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Salt Effects on Formation and Stability of Colloidal Gas Aphrons Produced by Anionic and Zwitterionic Surfactants in Xanthan Gum Solution

机译：阴离子胶溶液中阴离子和两性离子表面活性剂产生的胶体气体蚜的形成与稳定性

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This work is devoted to the influence of NaCl salt concentration on the formation and stability of colloidal gas aphrons (CGA) produced by the anionic surfactant sodium dodecyl sulfate (SDS) and zwitterionic surfactant coco amido propyl betaine (CAPB) in the presence of xanthan gum (XG) as a stabilizer. Dynamic surface tension measurements as well as volume and half-life time of the produced foams are considered for stability analysis. A sharp decrease of the half-life time and volume of the CGAs at NaCl concentrations larger than 20,000 ppm was observed, which was attributed to the precipitation of SDS in the solution. The mentioned SDS precipitation altered the dynamic surface tension behavior, dilational surface elasticity, and turbidity of the solution. The main reason for the precipitation of SDS is the increased Krafft point caused by the addition of salt. However, for the zwitterionic surfactant CAPB, the effects of added NaCl on the interfacial properties required for CGAs production was negligible due to the simultaneous effects on the cationic and anionic head groups in the CAPB leading to negligible changes in the net repulsion forces. Yet, an overall reduction in the half-life time of CGAs with increasing salt concentration, even when we have no precipitation, was observed for both surfactants, which could be explained by the reduction in the ability of XG to increase the viscosity with increasing salt concentration.
机译：该作品致力于NaCl盐浓度对由阴离子表面活性剂十二烷基硫酸钠（SDS）和两性离子表面活性剂可可在黄原胶中产生的阴离子表面活性剂十二烷基硫酸钠（SDS）和两性离子表面活性剂可可的形成和稳定性的影响（XG）作为稳定剂。用于稳定性分析，考虑动态表面张力测量以及产生的泡沫的体积和半衰期时间。观察到大于20,000ppm的NaCl浓度的半衰期和CGA的半衰期和体积的急剧下降，其归因于溶液中SDS的沉淀。所述SDS沉淀改变了溶液的动态表面张力行为，膨胀表面弹性和浊度。 SDS沉淀的主要原因是由加入盐引起的KRAFFT点增加。然而，对于两性离子表面活性剂载体，添加NaCl对CGA生产所需的界面性能的影响是可以忽略不计的，因为载波中阳离子和阴离子头部的同时效果导致净排斥力的变化可忽略不计。然而，对于两种表面活性剂，观察到CGA的半衰期随着盐浓度的增加，也可以通过XG增加粘度增加粘度的能力来解释浓度。

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