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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >The Structure of Monododecyl Pentaethylene Glycol Monolayers with and without Added Dodecane at the Air/Solution Interface: A Neutron Reflection Study
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The Structure of Monododecyl Pentaethylene Glycol Monolayers with and without Added Dodecane at the Air/Solution Interface: A Neutron Reflection Study

机译：在空气/溶液界面处添加和不添加十二烷的单十二烷基五乙二醇单层结构：中子反射研究

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摘要

Neutron reflectometry and surface tensiometry have been used to study the composition and structure of a mixed monolayer of dodecane and the nonionic surfactant pentaethylene glycol monododecyl ether (C_(12)E_5) and the structure of the C_(12)E_5 on its own at the surface of aqueous solutions of C_(12)E_5. Partially labeling of the surfactant with deuterium gave the surface normal distributions of the ethylene glycol and hydrocarbon chains of the surfactant and of the water, and these results are compared with those from other members of the C_(12)E_m series. The C_(12)E_5 layer has a higher capacity for oil than that of the comparable hydrocarbon chain length cationic surfactant, dodecyl trimethylammonium bromide (C_(12)TAB), and the structure of the composite layer is also different. The separation of the centers of the surfactant chain and dodecane distributions is only 3 A in the C_(12)E_5 system in comparison with 6.5 A for C_(12)TAB. In this respect, the C_(12)E_5/dodecane system more closely resembles the sodium dodecyl sulfate/dodecanol system, and this is attributed to a favorable interaction between the dodecane and the ethylene glycol chain, which encourages a closer approach of the oil to the water surface. The hydrocarbon chain in the C_(12)E_m series where m is 6 or less is tilted at about 40 ° away from the surface normal. Upon incorporation of dodecane into the C_(12)E_t layer, the hydrocarbon chain changes to an almost perpendicular orientation.
机译：中子反射法和表面张力法已用于研究十二烷和非离子表面活性剂五乙二醇单十二烷基醚（C_（12）E_5）的混合单层的组成和结构以及C_（12）E_5单独的结构C_（12）E_5水溶液的表面。用氘部分标记表面活性剂可得到表面活性剂和水的乙二醇和烃链的表面正态分布，并将这些结果与C_（12）E_m系列其他成员的结果进行了比较。 C_（12）E_5层的油容量比同类烃链长阳离子表面活性剂十二烷基三甲基溴化铵（C_（12）TAB）高，并且复合层的结构也不同。在C_（12）E_5系统中，表面活性剂链和十二烷分布中心的间距仅为3 A，而C_（12）TAB为6.5A。在这方面，C_（12）E_5 /十二烷体系更类似于十二烷基硫酸钠/十二烷醇体系，这归因于十二烷与乙二醇链之间的良好相互作用，这促使油更紧密地接近水面。 m等于或小于6的C_（12）E_m系列烃链从表面法线倾斜约40°。在将十二烷结合到C_（12）E_t层中后，烃链改变为几乎垂直的方向。

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