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Molecular Dynamics Study of the Foam Stability of a Mixed Surfactant/Water System with and without Calcium Ions
Yang, Wenhong; Yang, Xiaozhen
2011-04-28
Source PublicationJOURNAL OF PHYSICAL CHEMISTRY B
ISSN1520-6106
Volume115Issue:16Pages:4645-4653
AbstractThe foam stability performance of a mixture surfactant system with and without calcium ions, including linear alkylbenzenesulfonate (LAS) and sodium dodecyl sulfate (SDS), has been studied by molecular dynamics. Microscopic interaction analysis reveals that the average binding number (ABN) indicates the population of interaction configurations at short distance (similar to 1.23 nm), ABN=0.88 for the mixture system that is larger than that of SDS (0.08) and smaller than that of LAS (1.00). ABN of the mixture 0.88 in between is consistent with experimental observations; the performance of the mixture becomes worse than that of LAS and better than that of SDS on the foam stability influenced by calcium ions. In the present anionic system, the fraction of free calcium ions, X(b) in the film system was obtained. If X(b) is in the high calcium ion zone (X(f) > 0.5), the foam stability performance appears to be considerably impacted by calcium ions. In the present study, we validated the variable of tail mass out of water film, W, is an indicator of foam stability in a system without Ca(2+). LAS+SDS mixture system has lower W value than the LAS single system, corresponding to its experimental observation on more stable foam film. Results show that a maximum of W value occurs before reaching the critical thickness for each investigated system. This was probably due to structural transition of the surfactant film system.
DOI10.1021/jp108433k
Indexed BySCI
Language英语
WOS IDWOS:000289697300011
PublisherAMER CHEMICAL SOC
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Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/71888
Collection中国科学院化学研究所
Corresponding AuthorYang, Xiaozhen
AffiliationChinese Acad Sci, BNLMS, State Key Lab Polymer Sci & Engn, Joint Lab Polymer Sci & Mat,Inst Chem, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Yang, Wenhong,Yang, Xiaozhen. Molecular Dynamics Study of the Foam Stability of a Mixed Surfactant/Water System with and without Calcium Ions[J]. JOURNAL OF PHYSICAL CHEMISTRY B,2011,115(16):4645-4653.
APA Yang, Wenhong,&Yang, Xiaozhen.(2011).Molecular Dynamics Study of the Foam Stability of a Mixed Surfactant/Water System with and without Calcium Ions.JOURNAL OF PHYSICAL CHEMISTRY B,115(16),4645-4653.
MLA Yang, Wenhong,et al."Molecular Dynamics Study of the Foam Stability of a Mixed Surfactant/Water System with and without Calcium Ions".JOURNAL OF PHYSICAL CHEMISTRY B 115.16(2011):4645-4653.
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