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Article

Effect of Temperature on the Dynamic Properties of Mixed Surfactant Adsorbed Layers at the Water/Hexane Interface under Low-Gravity Conditions

1
Institute of Biocolloid Chemistry, 03142 Kyiv (Kiev), Ukraine
2
Institute of Condensed Matter Chemistry and Technologies for Energy, Unit of Genoa, 16149 Genoa, Italy
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Department of Colloid Chemistry, St. Petersburg State University, 198504 St. Petersburg, Russia
4
Max Planck Institute of Colloids and Interface, 14424 Potsdam, Germany
5
Physics Department, Technical University Darmstadt, 64289 Darmstadt, Germany
*
Authors to whom correspondence should be addressed.
Colloids Interfaces 2020, 4(3), 27; https://doi.org/10.3390/colloids4030027
Received: 4 June 2020 / Revised: 26 June 2020 / Accepted: 28 June 2020 / Published: 2 July 2020
(This article belongs to the Special Issue Outstanding Scientists in Colloids and Interfaces: Emil Chibowski)
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. View Full-Text
Keywords: interfacial dilational viscoelasticity; mixed surfactant adsorption layer; water/hexane interface; drop oscillations; capillary pressure tensiometry; effect of temperature; microgravity interfacial dilational viscoelasticity; mixed surfactant adsorption layer; water/hexane interface; drop oscillations; capillary pressure tensiometry; effect of temperature; microgravity
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MDPI and ACS Style

Kovalchuk, V.I.; Loglio, G.; Bykov, A.G.; Ferrari, M.; Krägel, J.; Liggieri, L.; Miller, R.; Milyaeva, O.Y.; Noskov, B.A.; Ravera, F.; Santini, E.; Schneck, E. Effect of Temperature on the Dynamic Properties of Mixed Surfactant Adsorbed Layers at the Water/Hexane Interface under Low-Gravity Conditions. Colloids Interfaces 2020, 4, 27. https://doi.org/10.3390/colloids4030027

AMA Style

Kovalchuk VI, Loglio G, Bykov AG, Ferrari M, Krägel J, Liggieri L, Miller R, Milyaeva OY, Noskov BA, Ravera F, Santini E, Schneck E. Effect of Temperature on the Dynamic Properties of Mixed Surfactant Adsorbed Layers at the Water/Hexane Interface under Low-Gravity Conditions. Colloids and Interfaces. 2020; 4(3):27. https://doi.org/10.3390/colloids4030027

Chicago/Turabian Style

Kovalchuk, Volodymyr I., Giuseppe Loglio, Alexey G. Bykov, Michele Ferrari, Jürgen Krägel, Libero Liggieri, Reinhard Miller, Olga Y. Milyaeva, Boris A. Noskov, Francesca Ravera, Eva Santini, and Emanuel Schneck. 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, no. 3: 27. https://doi.org/10.3390/colloids4030027

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