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Isabettini S, Böni LJ, Baumgartner M, Saito K, Kuster S, Fischer P, Lutz-Bueno V. Higher Salt Hydrophobicity Lengthens Ionic Wormlike Micelles and Stabilizes Them upon Heating. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:132-138. [PMID: 33356307 DOI: 10.1021/acs.langmuir.0c02608] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Tuning the rheological properties of surfactant solutions by charge screening is a convenient formulation tool in cosmetic, household, oil recovery, drag-reduction, and thickening applications. Surfactants self-assemble in water, and upon charge screening and core shielding, they grow into long wormlike micelles (WLMs). These are valuable model systems for soft matter physics, and the most explored formulation is hexadecyl-trimethylammonium bromide (CTAB) and sodium salicylate (NaSal). Replacing NaSal with aromatic salts of altered hydrophobicity results in different penetration of the additive in the CTAB micellar core. This altered penetration depth will determine the anisotropic micellar growth that tailors the viscoelastic response. Sodium 4-methylsalicylate (mNaSal) is a higher hydrophobicity alternative to NaSal, requiring less additive to induce strong changes in the viscoelastic properties. Herein, we provide a comparative study of the mNaSal/CTAB system with the reference NaSal/CTAB over a range of temperatures and salt concentrations. The findings from the well-known NaSal/CTAB pair are transferred to the mNaSal/CTAB system, revealing the origins of the WLM solution's viscoelastic properties by discerning contributions from charge screening and micellar core shielding upon small differences in hydrophobicity.
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Affiliation(s)
- Stephane Isabettini
- Institute of Food, Nutrition and Health, ETH Zurich, 8092 Zurich, Switzerland
| | - Lukas J Böni
- Institute of Food, Nutrition and Health, ETH Zurich, 8092 Zurich, Switzerland
| | - Mirjam Baumgartner
- Institute of Food, Nutrition and Health, ETH Zurich, 8092 Zurich, Switzerland
| | - Keita Saito
- Heat and Fluid Engineering Group, Department of Mechanical Engineering, Nagaoka University of Technology, 940-2188 Nagaoka, Japan
| | - Simon Kuster
- Institute of Food, Nutrition and Health, ETH Zurich, 8092 Zurich, Switzerland
| | - Peter Fischer
- Institute of Food, Nutrition and Health, ETH Zurich, 8092 Zurich, Switzerland
| | - Viviane Lutz-Bueno
- Institute of Food, Nutrition and Health, ETH Zurich, 8092 Zurich, Switzerland
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Tammaro D, Pasquino R, Villone MM, D'Avino G, Ferraro V, Di Maio E, Langella A, Grizzuti N, Maffettone PL. Elasticity in Bubble Rupture. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:5646-5654. [PMID: 29664652 DOI: 10.1021/acs.langmuir.8b00520] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
When a Newtonian bubble ruptures, the film retraction dynamics is controlled by the interplay of surface, inertial, and viscous forces. In case a viscoelastic liquid is considered, the scenario is enriched by the appearance of a new significant contribution, namely, the elastic force. In this paper, we investigate experimentally the retraction of viscoelastic bubbles inflated at different blowing rates, showing that the amount of elastic energy stored by the liquid film enclosing the bubble depends on the inflation history and in turn affects the velocity of film retraction when the bubble is punctured. Several viscoelastic liquids are considered. We also perform direct numerical simulations to support the experimental findings. Finally, we develop a simple heuristic model able to interpret the physical mechanism underlying the process.
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Affiliation(s)
- Daniele Tammaro
- Department of Chemical, Materials, and Manufacturing Engineering , University of Napoli Federico II , P.le Tecchio 80 , 80125 Napoli , Italy
| | - Rossana Pasquino
- Department of Chemical, Materials, and Manufacturing Engineering , University of Napoli Federico II , P.le Tecchio 80 , 80125 Napoli , Italy
| | - Massimiliano Maria Villone
- Department of Chemical, Materials, and Manufacturing Engineering , University of Napoli Federico II , P.le Tecchio 80 , 80125 Napoli , Italy
| | - Gaetano D'Avino
- Department of Chemical, Materials, and Manufacturing Engineering , University of Napoli Federico II , P.le Tecchio 80 , 80125 Napoli , Italy
- Institute of Applied Science and Intelligent Systems , National Research Council of Italy , Via Campi Flegrei 34 , 80078 Pozzuoli , Naples , Italy
| | - Vincenzo Ferraro
- Department of Chemical, Materials, and Manufacturing Engineering , University of Napoli Federico II , P.le Tecchio 80 , 80125 Napoli , Italy
| | - Ernesto Di Maio
- Department of Chemical, Materials, and Manufacturing Engineering , University of Napoli Federico II , P.le Tecchio 80 , 80125 Napoli , Italy
- Institute of Applied Science and Intelligent Systems , National Research Council of Italy , Via Campi Flegrei 34 , 80078 Pozzuoli , Naples , Italy
| | - Antonio Langella
- Department of Chemical, Materials, and Manufacturing Engineering , University of Napoli Federico II , P.le Tecchio 80 , 80125 Napoli , Italy
| | - Nino Grizzuti
- Department of Chemical, Materials, and Manufacturing Engineering , University of Napoli Federico II , P.le Tecchio 80 , 80125 Napoli , Italy
| | - Pier Luca Maffettone
- Department of Chemical, Materials, and Manufacturing Engineering , University of Napoli Federico II , P.le Tecchio 80 , 80125 Napoli , Italy
- Institute of Applied Science and Intelligent Systems , National Research Council of Italy , Via Campi Flegrei 34 , 80078 Pozzuoli , Naples , Italy
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Gaudino D, Pasquino R, Kriegs H, Szekely N, Pyckhout-Hintzen W, Lettinga MP, Grizzuti N. Effect of the salt-induced micellar microstructure on the nonlinear shear flow behavior of ionic cetylpyridinium chloride surfactant solutions. Phys Rev E 2017; 95:032603. [PMID: 28415244 DOI: 10.1103/physreve.95.032603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2016] [Indexed: 06/07/2023]
Abstract
The shear flow dynamics of linear and branched wormlike micellar systems based on cetylpyridinium chloride and sodium salicylate in brine solution is investigated through rheometric and scattering techniques. In particular, the flow and the structural flow response are explored via velocimetry measurements and rheological and rheometric small-angle neutron scattering (SANS) experiments, respectively. Although all micellar solutions display a similar shear thinning behavior in the nonlinear regime, the experimental results show that shear banding sets in only when the micelle contour length L[over ¯] is sufficiently long, independent of the nature of the micellar connections (either linear or branched micelles). Using rheometric SANS, we observe that the shear banding systems both show very similar orientational ordering as a function of Weissenberg number, while the short branched micelles manifest an unexpected increase of ordering at very low Weissenberg numbers. This suggests the presence of an additional flow-induced relaxation process that is peculiar for branched systems.
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Affiliation(s)
- D Gaudino
- Dipartimento di Ingegneria Chimica, dei Materiali d della Produzione Industriale, Università degli Studi di Napoli Federico II, Piazzale Vincenzo Tecchio 80, 80125 Napoli, Italy
| | - R Pasquino
- Dipartimento di Ingegneria Chimica, dei Materiali d della Produzione Industriale, Università degli Studi di Napoli Federico II, Piazzale Vincenzo Tecchio 80, 80125 Napoli, Italy
| | - H Kriegs
- Institute for Complex Systems, Forschungszentrum Jülich, 52425 Jülich, Germany
| | - N Szekely
- Jülich Centre for Neutron Science Outstation at MLZ, Lichtenbergstrasse 1, 85747 Garching, Germany
| | - W Pyckhout-Hintzen
- Jülich Centre for Neutron Science, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
| | - M P Lettinga
- Institute for Complex Systems, Forschungszentrum Jülich, 52425 Jülich, Germany
- Laboratory for Soft Matter and Biophysics, KU Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium
| | - N Grizzuti
- Dipartimento di Ingegneria Chimica, dei Materiali d della Produzione Industriale, Università degli Studi di Napoli Federico II, Piazzale Vincenzo Tecchio 80, 80125 Napoli, Italy
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