Effect of architecture on the formation of surface multilayer structures at the air-solution interface from mixtures of surfactant with small poly(ethyleneimine)s.

Effect of architecture on the formation of surface multilayer structures at the air-solution interface from mixtures of surfactant with small poly(ethyleneimine)s.
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结构对表面活性剂与小聚(乙烯亚胺)混合物在空气-溶液界面形成表面多层结构的影响。

DOI:
10.1021/la3003977
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发表时间:
2012
期刊:
the ACS journal of surfaces and colloids
影响因子:
--
通讯作者:
Halacheva SS
Halacheva SS
中科院分区:
--
文献类型:
--
作者:
Halacheva SS

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通过表面张力(ST)和中子反射率(NR)研究了乙烯亚胺结构对小聚亚胺和低聚亚胺(OEIs)与阴离子表面活性剂十二烷基硫酸钠(SDS)在气-液界面吸附行为的影响。OEI和SDS之间强烈的表面相互作用产生了复杂的表面张力行为,这种行为具有明显的pH依赖性。NR数据提供了更直接的表面结构,并表明ST行为模式与大量OEI/SDS吸附和表面多层结构的自发形成相关。表面形成多层的区域取决于SDS和OEI浓度、溶液pH和OEI结构(线性或分支)。对于具有SDS的线性OEI(辛乙基亚胺、线性聚(乙基亚胺)或LPEI8和十乙基亚胺,LPEI10),在pH值为7时,在OEI和SDS浓度范围内,表面会形成多层吸附,在pH值为10时,表面的多层吸附程度要小得多,而在pH值为3时,只发生单层吸附。而对于支链OEI bpei8和bpei10,在pH为3和7的OEI和SDS浓度范围内,表面形成多层吸附,在pH为10时,吸附主要以单层形式存在。该结果为OEI结构和pH值如何控制和操纵OEI/表面活性剂吸附性质提供了重要的见解。
The impact of ethyleneimine architecture on the adsorption behavior of mixtures of small poly(ethyleneimines) and oligoethyleneimines (OEIs) with the anionic surfactant sodium dodecylsulfate (SDS) at the air–solution interface has been studied by surface tension (ST) and neutron reflectivity (NR). The strong surface interaction between OEI and SDS gives rise to complex surface tension behavior that has a pronounced pH dependence. The NR data provide more direct access to the surface structure and show that the patterns of ST behavior are correlated with substantial OEI/SDS adsorption and the spontaneous formation of surface multilayer structures. The regions of surface multilayer formation depend upon SDS and OEI concentrations, on the solution pH, and on the OEI architecture, linear or branched. For the linear OEIs (octaethyleneimine, linear poly(ethyleneimine) or LPEI8, and decaethyleneimine, LPEI10) with SDS, surface multilayer formation occurs over a range of OEI and SDS concentrations at pH 7 and to a much lesser extent at pH 10, whereas at pH 3 only monolayer adsorption occurs. In contrast, for branched OEIs BPEI8and BPEI10surface multilayer formation occurs over a wide range of OEI and SDS concentrations at pH 3 and 7, and at pH 10, the adsorption is mainly in the form of a monolayer. The results provide important insight into how the OEI architecture and pH can be used to control and manipulate the nature of the OEI/surfactant adsorption.
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