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  The Role of Electrostatic Repulsion on Increasing Surface Activity of Anionic Surfactants in the Presence of Hydrophilic Silica Nanoparticles

Vatanparast, H., Shahabi, F., Bahramian, A., Javadi, A., & Miller, R. (2018). The Role of Electrostatic Repulsion on Increasing Surface Activity of Anionic Surfactants in the Presence of Hydrophilic Silica Nanoparticles. Scientific Reports, 8(1): 7251. doi:10.1038/s41598-018-25493-7.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-5053-7 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-5054-6
Genre: Journal Article

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Vatanparast, Hamid, Author
Shahabi, Farshid, Author
Bahramian, Alireza, Author
Javadi, Aliyar, Author
Miller, Reinhard1, Author              
Affiliations:
1Reinhard Miller, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863501              

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Free keywords: Open Access
 Abstract: Hydrophilic silica nanoparticles alone are not surface active. They, however, develop a strong electrostatic interaction with ionic surfactants and consequently affect their surface behavior. We report the interfacial behavior of n-heptane/anionic-surfactant-solutions in the presence of hydrophilic silica nanoparticles. The surfactants are sodium dodecyl sulfate (SDS) and dodecyl benzene sulfonic acid (DBSA), and the diameters of the used particles are 9 and 30 nm. Using experimental tensiometry, we show that nanoparticles retain their non-surface-active nature in the presence of surfactants and the surface activity of surfactant directly increases with the concentration of nanoparticles. This fact was attributed to the electrostatic repulsive interaction between the negatively charged nanoparticles and the anionic surfactant molecules. The role of electrostatic repulsion on increasing surface activity of the surfactant has been discussed. Further investigations have been performed for screening the double layer charge of the nanoparticles in the presence of salt. Moreover, the hydrolysis of SDS molecules in the presence of silica nanoparticles and the interaction of nanoparticles with SDS inherent impurities have been studied. According to our experimental observations, silica nanoparticles alleviate the effects of dodecanol, formed by SDS hydrolysis, on the interfacial properties of SDS solution.

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 Dates: 2018
 Publication Status: Published in print
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 Identifiers: DOI: 10.1038/s41598-018-25493-7
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Title: Scientific Reports
  Abbreviation : Sci. Rep.
Source Genre: Journal
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Publ. Info: London, UK : Nature Publishing Group
Pages: - Volume / Issue: 8 (1) Sequence Number: 7251 Start / End Page: - Identifier: ISSN: 2045-2322