Entropic nature of the adsorption of sodium dodecylbenzenesulfonate on nanoparticles of aluminum and iron oxides in aqueous medium
- 作者: Mansurov R.1, Safronov A.1,2, Lakiza N.1
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隶属关系:
- Ural Federal University
- Institute of Electrophysics, Ural Branch
- 期: 卷 90, 编号 6 (2016)
- 页面: 1200-1205
- 栏目: Physical Chemistry of Nanoclusters and Nanomaterials
- URL: https://journals.rcsi.science/0036-0244/article/view/168325
- DOI: https://doi.org/10.1134/S0036024416060121
- ID: 168325
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详细
The adsorption of anionic surfactant sodium dodecylbenzenesulfonate (SDBS) from aqueous solution on the hydrophilic surfaces of aluminum oxide and iron oxide nanoparticles is studied via UV spectrophotometry, electrophoretic light scattering, and isothermal microcalorimetry. It is shown that the isotherms of the adsorption of SDBS on the surfaces of both oxides in the area of concentrations up to 0.6 mmol/L is linear. It is found that the positive zeta potential of the surfaces of the particles falls to zero and shifts toward the range of negative values due to adsorption. The adsorption of SDBS is characterized by positive enthalpy values over the investigated range of concentrations, while the loss of energy during adsorption indicates it is of an entropic nature. It is concluded that the probable cause of the increase in entropy is the dehydration of SDBS molecules during on surface adsorption. The obtained results are discussed in terms of the formation of hemimicelles of surfactant on the hydrophilic surfaces of metal oxide nanoparticles in an aqueous medium.
作者简介
R. Mansurov
Ural Federal University
编辑信件的主要联系方式.
Email: renat.mans@gmail.com
俄罗斯联邦, Yekaterinburg, 620002
A. Safronov
Ural Federal University; Institute of Electrophysics, Ural Branch
Email: renat.mans@gmail.com
俄罗斯联邦, Yekaterinburg, 620002; Yekaterinburg, 620016
N. Lakiza
Ural Federal University
Email: renat.mans@gmail.com
俄罗斯联邦, Yekaterinburg, 620002