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  Effect of temperature on the dynamic properties of mixed surfactant adsorbed layers at the water/hexane interface under low-gravity conditions

Kovalchuk, V. I., Loglio, G., Bykov, A. G., Ferrari, M., Krägel, J., Liggieri, L., et al. (2020). Effect of temperature on the dynamic properties of mixed surfactant adsorbed layers at the water/hexane interface under low-gravity conditions. Colloids and Interfaces, 4(3): 27. doi:10.3390/colloids4030027.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0007-5382-8 Version Permalink: http://hdl.handle.net/21.11116/0000-0007-5383-7
Genre: Journal Article

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Kovalchuk, Volodymyr I., Author
Loglio, Giuseppe, Author
Bykov, Alexey G., Author
Ferrari, Michele, Author
Krägel, Jürgen1, Author              
Liggieri, Libero, Author
Miller, Reinhard1, Author              
Milyaeva, Olga Yu., Author
Noskov, Boris A., Author
Ravera, Francesca, Author
Santini, Eva, Author
Schneck, Emanuel2, Author              
Affiliations:
1Reinhard Miller, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863501              
2Emanuel Schneck, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_2074300              

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Free keywords: interfacial dilational viscoelasticity; mixed surfactant adsorption layer; water/hexane interface; drop oscillations; capillary pressure tensiometry; effect of temperature; microgravity
 Abstract: An increase in temperature typically leads to a decrease in the interfacial tension of a water/oil interface. The addition of surfactants to the system can complicate the situation significantly, i.e., the interfacial tension can increase or decrease with an increasing temperature. For most concentrations of the two studied surfactants, the cationic tetradecyl trimethyl ammonium bromide (TTAB) and the nonionic tridecyl dimethyl phosphine oxide (C13DMPO), the measured interfacial tension of the aqueous mixed surfactant solutions against hexane increases when the temperature decreases between 30°C and 20°C. However, with a further temperature decrease between 20°C and 15°C, the reverse effect has also been observed at some concentrations, i.e., a decrease of interfacial tension. Additionally, the corresponding dilational interfacial visco-elasticity shows some discrepant temperature effects, depending on the bulk concentration and oscillation frequency. The experiments have been performed with a capillary pressure tensiometer under the conditions of micro-gravity. The reason for the positive and negative interfacial tension and visco-elasticity gradients, respectively, within certain ranges of the temperature, concentration and mixing ratios, are discussed on the basis of all available parameters, such as the solubility and partitioning of the surfactants in the two liquid phases and the oscillation frequency.

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Language(s): eng - English
 Dates: 2020
 Publication Status: Published in print
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 Rev. Type: -
 Identifiers: DOI: 10.3390/colloids4030027
BibTex Citekey: colloids4030027
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Title: Colloids and Interfaces
Source Genre: Journal
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Publ. Info: Basel : MDPI
Pages: - Volume / Issue: 4 (3) Sequence Number: 27 Start / End Page: - Identifier: ISSN: 2504-5377