Viscoelasticity enhancement induced by salts for highly concentrated oil-in-water (O/W) emulsions | |
Department | 清洁能源化学与材料实验室 |
Fu, Yanxu1; Liang, Dong1; Aibu Abdunaibe1; Li HG(李洪光)2; Yan, Hao3; Wang, Hong3; Li HG(李洪光) | |
The second department | 固体润滑国家重点实验室 |
2017 | |
Source Publication | Colloids and Surfaces A: Physicochemical and Engineering Aspects |
ISSN | 0927-7757 |
Volume | 513Pages:280-286 |
Abstract | Highly concentrated viscoelastic paraffin oil-in-water emulsions were prepared by using tetradecyltrimethylammonium laurate (TTAL) as the emulsifier at a water percentage of 10%. The influences of four different inorganic salts, i.e., NaCl, NaBr, CaCl2 and MgSO4, on the structures and rheological properties of the emulsions have been investigated. It was found that the addition of salt eventually induces macroscopic phase separation of the emulsions and the influence following the order of NaCl < NaBr < CaCl2 < MgSO4. At intermediate salt concentrations, the introduction of salt leads to obvious viscoelasticity enhancement of the emulsions. The ability of the salt to induce the viscoelasticity enhancement approximately follows an opposite order to that found in phase separation, which is 100 folds at 500 mmol L−1 NaCl (potentially not reach the maximum), 400 folds at 300 mmol L−1 NaBr, 10 folds at 50 mmol L−1 CaCl2 and 6 folds at 15 mmol L−1 MgSO4, respectively. It is speculated that the adsorption of the inorganic cation and anion onto the charged surfactant monolayer at the oil/water interface changes the properties of the emulsion droplets, accounting for this unusual viscoelasticity enhancement. By conductivity measurements, it is also evidenced that the dissociation and mobility of the adsorbed ions can be hardly influenced by temperature, which leads to pronounced stability of the emulsions at elevated temperatures. The salt-induced structural transitions have been monitored by optical microscopy and confocal fluorescence microscopy observations, both of which show the presence of large oil droplets surrounded by hierarchically-organized smaller ones. |
Keyword | Viscoelastic Paraffin Oil Emulsion Salt Gelation |
Subject Area | 材料科学与物理化学 |
DOI | 10.1016/j.colsurfa.2016.10.055 |
Funding Organization | National Natural Science Foundation of China (no. 61474124;no. 21402215);the Hundred Talents Program of Chinese Academy of Sciences(Y20245YBR1);the CNOOC Research Center, State Key Laboratory of Offshore Oil Exploitation (CCL2013RCPS0243GNN) |
Indexed By | SCI |
If | 2.714 |
Language | 英语 |
Funding Project | 柔性有机太阳能电池研究组 |
compositor | 第二作者单位 |
Citation statistics | |
Document Type | 期刊论文 |
Identifier | http://ir.licp.cn/handle/362003/21211 |
Collection | 清洁能源化学与材料实验室 固体润滑国家重点实验室(LSL) |
Corresponding Author | Wang, Hong; Li HG(李洪光) |
Affiliation | 1.Key Laboratory of Colloid and Interface Chemistry & Key Laboratory of Special Aggregated Materials, Shandong University, Ministry of Education, Jinan, 250100, China 2.State Key Laboratory of Solid Lubrication & Laboratory of Clean Energy Chemistry and Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China 3.College of Materials Sciences and Engineering, School of Chemistry and Chemical Engineering, Beijing University of Chemical Technology, Beijing, 100029, China |
Recommended Citation GB/T 7714 | Fu, Yanxu,Liang, Dong,Aibu Abdunaibe,et al. Viscoelasticity enhancement induced by salts for highly concentrated oil-in-water (O/W) emulsions[J]. Colloids and Surfaces A: Physicochemical and Engineering Aspects,2017,513:280-286. |
APA | Fu, Yanxu.,Liang, Dong.,Aibu Abdunaibe.,Li HG.,Yan, Hao.,...&李洪光.(2017).Viscoelasticity enhancement induced by salts for highly concentrated oil-in-water (O/W) emulsions.Colloids and Surfaces A: Physicochemical and Engineering Aspects,513,280-286. |
MLA | Fu, Yanxu,et al."Viscoelasticity enhancement induced by salts for highly concentrated oil-in-water (O/W) emulsions".Colloids and Surfaces A: Physicochemical and Engineering Aspects 513(2017):280-286. |
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