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Dynamic Viscosity, Surface Tension and Wetting Behavior Studies of Paraffin–in–Water Nano–Emulsions

Author

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  • David Cabaleiro

    (Université Rennes 1, LGCGM, EA3913, F-35704 Rennes, France
    Institute of Construction Technologies, National Research Council, I–35127 Padova, Italy
    Departamento de Física Aplicada, Universidade de Vigo, E–36310 Vigo, Spain)

  • Samah Hamze

    (Université Rennes 1, LGCGM, EA3913, F-35704 Rennes, France)

  • Filippo Agresti

    (Institute of Condensed Matter Chemistry and Technologies for Energy, National Research Council, I–35127 Padova, Italy)

  • Patrice Estellé

    (Université Rennes 1, LGCGM, EA3913, F-35704 Rennes, France)

  • Simona Barison

    (Institute of Condensed Matter Chemistry and Technologies for Energy, National Research Council, I–35127 Padova, Italy)

  • Laura Fedele

    (Institute of Construction Technologies, National Research Council, I–35127 Padova, Italy)

  • Sergio Bobbo

    (Institute of Construction Technologies, National Research Council, I–35127 Padova, Italy)

Abstract

This work analyzes the dynamic viscosity, surface tension and wetting behavior of phase change material nano–emulsions (PCMEs) formulated at dispersed phase concentrations of 2, 4 and 10 wt.%. Paraffin–in–water samples were produced using a solvent–assisted route, starting from RT21HC technical grade paraffin with a nominal melting point at ~293–294 K. In order to evaluate the possible effect of paraffinic nucleating agents on those three properties, a nano–emulsion with 3.6% of RT21HC and 0.4% of RT55 (a paraffin wax with melting temperature at ~328 K) was also investigated. Dynamic viscosity strongly rose with increasing dispersed phase concentration, showing a maximum increase of 151% for the sample containing 10 wt.% of paraffin at 278 K. For that same nano–emulsion, a melting temperature of ~292.4 K and a recrystallization temperature of ~283.7 K (which agree with previous calorimetric results of that emulsion) were determined from rheological temperature sweeps. Nano–emulsions exhibited surface tensions considerably lower than those of water. Nevertheless, at some concentrations and temperatures, PCME values are slightly higher than surface tensions obtained for the corresponding water+SDS mixtures used to produce the nano–emulsions. This may be attributed to the fact that a portion of the surfactant is taking part of the interface between dispersed and continuous phase. Finally, although RT21HC–emulsions exhibited contact angles considerably inferior than those of distilled water, PCME sessile droplets did not rapidly spread as it happened for water+SDS with similar surfactant contents or for bulk–RT21HC.

Suggested Citation

  • David Cabaleiro & Samah Hamze & Filippo Agresti & Patrice Estellé & Simona Barison & Laura Fedele & Sergio Bobbo, 2019. "Dynamic Viscosity, Surface Tension and Wetting Behavior Studies of Paraffin–in–Water Nano–Emulsions," Energies, MDPI, vol. 12(17), pages 1-19, August.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:17:p:3334-:d:262144
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    References listed on IDEAS

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    1. Cabaleiro, D. & Agresti, F. & Fedele, L. & Barison, S. & Hermida-Merino, C. & Losada-Barreiro, S. & Bobbo, S. & Piñeiro, M.M., 2022. "Review on phase change material emulsions for advanced thermal management: Design, characterization and thermal performance," Renewable and Sustainable Energy Reviews, Elsevier, vol. 159(C).
    2. Patrice Estellé & Leonor Hernández López & Matthias H. Buschmann, 2020. "Special Issue of the 1st International Conference on Nanofluids (ICNf19)," Energies, MDPI, vol. 13(9), pages 1-4, May.
    3. Nur Çobanoğlu & Ziya Haktan Karadeniz & Patrice Estellé & Raul Martínez-Cuenca & Matthias H. Buschmann, 2019. "Prediction of Contact Angle of Nanofluids by Single-Phase Approaches," Energies, MDPI, vol. 12(23), pages 1-16, November.

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