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  Interfacial dilational viscoelasticity of adsorption layers at the hydrocarbon/water interface : the fractional Maxwell model

Loglio, G., Kovalchuk, V. I., Bykov, A. G., Ferrari, M., Krägel, J., Liggieri, L., et al. (2019). Interfacial dilational viscoelasticity of adsorption layers at the hydrocarbon/water interface: the fractional Maxwell model. Colloids and Interfaces, 3(4): 66. doi:10.3390/colloids3040066.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-6441-1 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-6442-0
Genre: Journal Article

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 Creators:
Loglio, Giuseppe, Author
Kovalchuk, Volodymyr I., Author
Bykov, Alexey G., Author
Ferrari, Michele, Author
Krägel, Jürgen1, Author              
Liggieri, Libero, Author
Miller, Reinhard1, Author              
Noskov, Boris A., Author
Pandolfini, Piero, Author
Ravera, Francesca, Author
Santini, Eva, Author
Affiliations:
1Reinhard Miller, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863501              

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Free keywords: fractional Maxwell model; interfacial dilational viscoelasticity; mixed surfactant adsorption layer; water/paraffin-oil and water/hexane interface; drop oscillations; capillary pressure tensiometry; microgravity
 Abstract: In this communication, the single element version of the fractional Maxwell model (single-FMM or Scottndash;Blair model) is adopted to quantify the observed behavior of the linear interfacial dilational viscoelasticity. This mathematical tool is applied to the results obtained by capillary pressure experiments under low-gravity conditions aboard the International Space Station, for adsorption layers at the hydrocarbon/water interface. Two specific experimental sets of steady-state harmonic oscillations of interfacial area are reported, respectively: a drop of pure water into a Span-80 surfactant/paraffin-oil matrix and a pure n-hexane drop into a C13DMPO/TTAB mixed surfactants/aqueous-solution matrix. The fractional constitutive single-FMM is demonstrated to embrace the standard Maxwell model (MM) and the Lucassenndash;van-den-Tempel model (Lndash;vdT), as particular cases. The single-FMM adequately fits the Span-80/paraffin-oil observed results, correctly predicting the frequency dependence of the complex viscoelastic modulus and the inherent phase-shift angle. In contrast, the single-FMM appears as a scarcely adequate tool to fit the observed behavior of the mixed-adsorption surfactants for the C13DMPO/TTAB/aqueous solution matrix (despite the single-FMM satisfactorily comparing to the phenomenology of the sole complex viscoelastic modulus). Further speculations are envisaged in order to devise combined FMM as rational guidance to interpret the properties and the interfacial structure of complex mixed surfactant adsorption systems.

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Language(s): eng - English
 Dates: 2019-12-102019
 Publication Status: Published in print
 Pages: -
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 Identifiers: DOI: 10.3390/colloids3040066
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Title: Colloids and Interfaces
  Alternative Title : J. Phys. Chem. Lett.
Source Genre: Journal
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Publ. Info: Basel : MDPI
Pages: - Volume / Issue: 3 (4) Sequence Number: 66 Start / End Page: - Identifier: ISSN: 2504-5377