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题名: A Trimeric Surfactant: Surface Micelles, Hydration-Lubrication, and Formation of a Stable, Charged Hydrophobic Monolayer
作者: Kampf, Nir1; Wu, Chunxian2; Wang, Yilin2; Klein, Jacob1
刊名: LANGMUIR
发表日期: 2016-11-15
卷: 32, 期:45, 页:11754-11762
收录类别: SCI
英文摘要: The surface structure of the trimeric surfactant tri(dodecyldimethylammonioacetoxy)diethyltriamine trichloride (DTAD) on mica and the interactions between two such DTAD-coated surfaces were determined using atomic force microscopy and a surface force balance. In an aqueous solution of 3 mM, 5 times the critical aggregation concentration (CAC), the surfaces are coated with wormlike micelles or hemimicelles and larger (similar to 80 nm) bilayer vesicles. Repulsive normal interactions between the surfaces indicate a net surface charge and a solution concentration of ions close to that expected from the CAC. Moreover, this surface coating is strongly lubricating up to some tens of atmospheres, attributed to the hydration lubrication mechanism acting at the exposed, highly hydrated surfactant headgroups. Upon replacement of the DTAD solution with surfactant-free water, the surface structures have changed on the DTAD monolayers, which then jump into adhesive contact on approach, both in water and following, addition of 0.1 M NaNO3. This trimeric surfactant monolayer, which is highly hydrophobic, is found to be positively charged, which is evident from the attraction between the DTAD monolayer and negatively charged bare mica across water. These monolayers are stable over days even under a salt solution. The stability is attributed to the several stabilization pathways available to DTAD on the mica surface.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.iccas.ac.cn/handle/121111/35727
Appears in Collections:胶体、界面与化学热力学实验室_期刊论文

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作者单位: 1.Weizmann Inst Sci, Dept Mat & Interfaces, IL-76100 Rehovot, Israel
2.Chinese Acad Sci, Key Lab Colloid & Interface Sci, BNLMS, Inst Chem, Beijing 100190, Peoples R China
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