Solution pH and oligoamine molecular weight dependence of the transition from monolayer to multilayer adsorption at the air-water interface from sodium dodecyl sulfate/oligoamine mixtures.

Solution pH and oligoamine molecular weight dependence of the transition from monolayer to multilayer adsorption at the air-water interface from sodium dodecyl sulfate/oligoamine mixtures.
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十二烷基硫酸钠/低聚胺混合物在空气-水界面处从单层吸附到多层吸附转变的溶液 pH 值和低聚胺分子量依赖性。

DOI:
10.1021/la400929z
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发表时间:
2013
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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利用中子反射率和表面张力研究了十二烷基硫酸钠(SDS)/低聚胺混合物在空气-水界面吸附时溶液pH和低聚胺分子量的依赖关系。对于二乙烯三胺、三胺或三乙烯四胺、毒胺与SDS混合,在pH为7和10时发生单层吸附,在pH为3时发生多层吸附。对于分子量稍高的四乙基戊二胺、五胺和五乙基戊二胺,在pH值为3时以单层形式吸附,在pH值为7和10时以多层形式吸附。因此,有一个由pH驱动的从单层到多层吸附的转变,当低聚胺分子量从毒鼠胺到五胺增加时,从低pH到高pH的转变。这是由于SDS与胺氮基团之间的静电吸引力相对平衡,随着电荷密度的增加而降低,胺氮与硫酸SDS基团之间的离子偶极相互作用在高pH下占主导地位,结合SDS分子之间的疏水烷基间链相互作用随着低聚胺分子量的变化而变化。
Neutron reflectivity and surface tension have been used to investigate the solution pH and oligoamine molecular weight dependence of the adsorption of sodium dodecyl sulfate (SDS)/oligoamine mixtures at the air–water interface. For diethylenetriamine, triamine, or triethylenetetramine, tetramine mixed with SDS, there is monolayer adsorption at pH 7 and 10, and multilayer adsorption at pH 3. For the slightly higher molecular weight tetraethylenepentamine, pentamine, and pentaethylenehexamine, hexamine, the adsorption is in the form of a monolayer at pH 3 and multilayers at pH 7 and 10. Hence, there is a pH driven transition from monolayer to multilayer adsorption, which shifts from low pH to higher pH as the oligoamine molecular weight increases from tetramine to pentamine. This results from the relative balance between the electrostatic attraction between the SDS and amine nitrogen group which decreases as the charge density decreases with increasing pH, the ion–dipole interaction between the amine nitrogen and SDS sulfate group which is dominant at higher pH, and the hydrophobic interalkyl chain interaction between bound SDS molecules which changes with oligoamine molecular weight.
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