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:
影响因子:
--
通讯作者:
Halacheva SS
中科院分区:
文献类型:
--
作者:
Halacheva SS
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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DOI:
10.1021/la8024843
发表时间:
2009
期刊:
the ACS journal of surfaces and colloids
影响因子:
--
作者:
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通讯作者:
Penfold J
影响因子:
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作者:
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通讯作者:
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DOI:
--
发表时间:
2003
期刊:
影响因子:
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