Effect of droplet charge density on stabilization of oil-in-dispersion emulsions co-stabilized by binary mixed surfactants and nanoparticles

IF 1.6 4区 工程技术 Q3 CHEMISTRY, APPLIED
Wanqing Zhang, Jianzhong Jiang, Zhenggang Cui
{"title":"Effect of droplet charge density on stabilization of oil-in-dispersion emulsions co-stabilized by binary mixed surfactants and nanoparticles","authors":"Wanqing Zhang,&nbsp;Jianzhong Jiang,&nbsp;Zhenggang Cui","doi":"10.1002/jsde.12810","DOIUrl":null,"url":null,"abstract":"<p>Ionic surfactant and similarly charged nanoparticles can co-stabilize oil-in-dispersion (OID) emulsions at extremely low concentrations (0.001 cmc/0.001 wt%), in which particles do not adsorb at the oil/water interface but distribute in the aqueous phase forming a dispersion. In this paper, the effect of droplet charge density on stabilization of the <i>n</i>-decane-in-water OID emulsion was examined by using a cetyl trimethyl ammonium bromide (CTAB)/C<sub>12</sub>B (dodecyl dimethyl carboxyl betaine) binary mixture at a low fixed total concentration (0.01 mM) with varying molar fractions of CTAB. A model based on the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory is proposed to calculate interaction energies between droplets and between droplets and particles. It is found that the droplet charge density can be well compensated by particle concentration along the stabilization boundary, and the OID emulsion still follows the DLVO stabilization. Particles tend to surround droplets at large distances but may form a monolayer between approaching droplets at shorter distances, which significantly reduces the van der Waals attraction between droplets. In addition, the induced auxiliary droplet–particle repulsion is proportional to the number of particles per unit area of droplet surfaces, which together with the droplet–droplet repulsion ensures a large total repulsion preventing droplets from flocculation and coalescence. This work explains quantitatively the stabilization of OID emulsions, which have potential applications in emulsion products such as foods, cosmetics, pesticides, and various industrial emulsion systems. Moreover, the development of the OID emulsions represents an important advancement in green chemistry as it substantially reduces the required amounts of emulsifiers and their environmental impact after use.</p>","PeriodicalId":17083,"journal":{"name":"Journal of Surfactants and Detergents","volume":"28 2","pages":"373-387"},"PeriodicalIF":1.6000,"publicationDate":"2024-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Surfactants and Detergents","FirstCategoryId":"5","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/jsde.12810","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"CHEMISTRY, APPLIED","Score":null,"Total":0}
引用次数: 0

Abstract

Ionic surfactant and similarly charged nanoparticles can co-stabilize oil-in-dispersion (OID) emulsions at extremely low concentrations (0.001 cmc/0.001 wt%), in which particles do not adsorb at the oil/water interface but distribute in the aqueous phase forming a dispersion. In this paper, the effect of droplet charge density on stabilization of the n-decane-in-water OID emulsion was examined by using a cetyl trimethyl ammonium bromide (CTAB)/C12B (dodecyl dimethyl carboxyl betaine) binary mixture at a low fixed total concentration (0.01 mM) with varying molar fractions of CTAB. A model based on the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory is proposed to calculate interaction energies between droplets and between droplets and particles. It is found that the droplet charge density can be well compensated by particle concentration along the stabilization boundary, and the OID emulsion still follows the DLVO stabilization. Particles tend to surround droplets at large distances but may form a monolayer between approaching droplets at shorter distances, which significantly reduces the van der Waals attraction between droplets. In addition, the induced auxiliary droplet–particle repulsion is proportional to the number of particles per unit area of droplet surfaces, which together with the droplet–droplet repulsion ensures a large total repulsion preventing droplets from flocculation and coalescence. This work explains quantitatively the stabilization of OID emulsions, which have potential applications in emulsion products such as foods, cosmetics, pesticides, and various industrial emulsion systems. Moreover, the development of the OID emulsions represents an important advancement in green chemistry as it substantially reduces the required amounts of emulsifiers and their environmental impact after use.

液滴电荷密度对二元混合表面活性剂和纳米颗粒共稳定油分散乳状液稳定性的影响
离子表面活性剂和类似带电的纳米颗粒可以在极低浓度(0.001 cmc/0.001 wt%)下共稳定分散型油(OID)乳液,其中颗粒不吸附在油/水界面上,而是分布在水相中形成分散体。本文以十六烷基三甲基溴化铵(CTAB)/十二烷基二甲基甜菜碱(C12B)二元混合物为原料,在低固定总浓度(0.01 mM)和不同摩尔分数的CTAB条件下,研究了液滴电荷密度对正癸烷水包型乳液稳定性的影响。提出了一种基于Derjaguin-Landau-Verwey-Overbeek (DLVO)理论的液滴间和液滴与粒子间相互作用能计算模型。研究发现,沿稳定边界的粒子浓度可以很好地补偿液滴电荷密度,并且OID乳液仍然遵循DLVO稳定。粒子倾向于在较远的距离上围绕液滴,但在较近的距离上,粒子可能在接近的液滴之间形成单层,这大大降低了液滴之间的范德华吸引力。此外,诱导的辅助液滴斥力与液滴表面单位面积的粒子数成正比,与液滴斥力共同保证了较大的总斥力,防止了液滴的絮凝和聚并。这项工作定量地解释了OID乳液的稳定性,它在乳液产品如食品、化妆品、农药和各种工业乳液体系中有潜在的应用。此外,OID乳剂的开发代表了绿色化学的重要进步,因为它大大减少了乳化剂的需求量及其使用后对环境的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
Journal of Surfactants and Detergents
Journal of Surfactants and Detergents 工程技术-工程:化工
CiteScore
3.80
自引率
6.20%
发文量
68
审稿时长
4 months
期刊介绍: Journal of Surfactants and Detergents, a journal of the American Oil Chemists’ Society (AOCS) publishes scientific contributions in the surfactants and detergents area. This includes the basic and applied science of petrochemical and oleochemical surfactants, the development and performance of surfactants in all applications, as well as the development and manufacture of detergent ingredients and their formulation into finished products.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:604180095
Book学术官方微信