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Fameau AL, Bordes R, Evenäs L, Stubenrauch C. Liquid foams as sensors for the detection of biomarkers. J Colloid Interface Sci 2023; 651:987-991. [PMID: 37586153 DOI: 10.1016/j.jcis.2023.08.061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Revised: 08/08/2023] [Accepted: 08/09/2023] [Indexed: 08/18/2023]
Abstract
Bioassays are widely used in healthcare to detect and quantify biomarkers, such as molecules or enzymes, which are crucial in monitoring diseases and health conditions. In developed countries, healthcare professionals use specialized reagents and equipment's to perform these bioassays. However, in less-industrialized countries, the creation of low cost, fast, and technically simple bioassays is required. Herein, we propose a simple approach for detecting biochemical markers using host-guest complexes containing a surfactant. When the biochemical marker is present, the host-guest complex is disrupted, releasing the surfactant and producing foam. The read-out mechanism relies on the change of foam volume as function of biomarker concentration. This change is quantifiable by the naked eye and can be measured with a simple ruler. We claim that the use of foams as sensing tool is an attractive, inexpensive, fast, and easy to handle on-site detection method.
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Affiliation(s)
- Anne-Laure Fameau
- INRAe, University Lille, CNRS, Centrale Lille, UMET, 59000 Lille, France.
| | - Romain Bordes
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Göteborg, Sweden
| | - Lars Evenäs
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Göteborg, Sweden
| | - Cosima Stubenrauch
- Institut für Physikalische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany.
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2
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Braun L, Hohenschutz M, Diat O, von Klitzing R, Bauduin P. Repulsive, but sticky - Insights into the non-ionic foam stabilization mechanism by superchaotropic nano-ions. J Colloid Interface Sci 2023; 641:437-448. [PMID: 36948099 DOI: 10.1016/j.jcis.2023.03.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Revised: 02/28/2023] [Accepted: 03/03/2023] [Indexed: 03/11/2023]
Abstract
HYPOTHESIS The superchaotropic Keggin polyoxometalate α-SiW12O404- (SiW) was recently shown to stabilize non-ionic surfactant (C18:1E10) foams owing to electrostatic repulsion that arises from the adsorption of SiW-ions to the foam interfaces. The precise mechanism of foam stabilization by SiW however remained unsolved. EXPERIMENTS Imaging and conductimetry were used on macroscopic foams to monitor the foam collapse under free drainage and small angle neutron scattering (SANS) at a given foam height allowed for the tracking of the evolution of film thickness under quasi-stationary conditions. Thin film pressure balance (TFPB) measurements enabled to quantify the resistance of single foam films to external pressure and to identify intra-film forces. FINDINGS At low SiW/surfactant ratios, the adsorption of SiW induces electrostatic repulsion within foam films. Above a concentration threshold corresponding to an adsorption saturation, excess of SiW screens the electrostatic repulsion that leads to thinner foam films. Despite screened electrostatics, the foam and single foam films remain very stable caused by an additional steric stabilizing force consistent with the presence of trapped micelles inside the foam films that bridge between the interfaces. These trapped micelles can serve as a surfactant reservoir, which promotes self-healing of the interface leading to much more resilient foam films in comparison to bare surfactant foams/films.
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Affiliation(s)
- Larissa Braun
- Soft Matter at Interfaces, Department of Physics, Technische Universität Darmstadt, Darmstadt, Germany
| | - Max Hohenschutz
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Marcoule, France; RWTH Aachen University, Institute of Physical Chemistry, Landoltweg 2, 52074 Aachen, Germany
| | - Olivier Diat
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Marcoule, France
| | - Regine von Klitzing
- Soft Matter at Interfaces, Department of Physics, Technische Universität Darmstadt, Darmstadt, Germany.
| | - Pierre Bauduin
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Marcoule, France.
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3
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Braun L, von Klitzing R. When Bulk Matters: Disentanglement of the Role of Polyelectrolyte/Surfactant Complexes at Surfaces and in the Bulk of Foam Films. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:111-118. [PMID: 36525629 DOI: 10.1021/acs.langmuir.2c02260] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Foam films display exciting systems as on one hand they dictate the performance of macroscopic foams and on the other hand they allow studies of surface forces. With regard to surface forces, we attempt to disentangle the effect of the foam film surfaces and the foam film bulk. For that, we study the influence of salt (LiBr) on foam films formed by mixtures of oppositely charged polyelectrolyte and surfactant: anionic monosulfonated polyphenylene sulfone (sPSO2-220) and cationic tetradecyltrimethylammonium bromide (C14TAB). Adding a small amount of salt (≤10-3 M) decreases the foam film stability due to a weakened electrostatic net repulsion. In contrast, a large amount of salt (10-2 M) unexpectedly increases the foam film stability. Disjoining pressure isotherms reveal that the increased stability is due to an additional steric stabilization, which is attributed to sPSO2-220/C14TAB complexes in the film bulk. These bulk complexes also contribute to the measured apparent surface potential between the two air/water interfaces. We find, for the first time, the formation of Newton black films for mixtures of anionic polyelectrolytes and cationic surfactants.
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Affiliation(s)
- Larissa Braun
- Soft Matter at Interfaces, Department of Physics, Technische Universität Darmstadt, Hochschulstraße 8, 64289Darmstadt, Germany
| | - Regine von Klitzing
- Soft Matter at Interfaces, Department of Physics, Technische Universität Darmstadt, Hochschulstraße 8, 64289Darmstadt, Germany
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4
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Czakaj A, Chatzigiannakis E, Vermant J, Krzan M, Warszyński P. The Influence of the Surface Chemistry of Cellulose Nanocrystals on Ethyl Lauroyl Arginate Foam Stability. Polymers (Basel) 2022; 14:5402. [PMID: 36559768 PMCID: PMC9785919 DOI: 10.3390/polym14245402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Revised: 11/30/2022] [Accepted: 12/05/2022] [Indexed: 12/14/2022] Open
Abstract
Guanidine-based surfactant ethyl lauroyl arginate (LAE) and cellulose nanocrystals (CNCs) form complexes of enhanced surface activity when compared to pure surfactants. The LAE-CNC mixtures show enhanced foaming properties. The dynamic thin-film balance technique (DTFB) was used to study the morphology, drainage and rupture of LAE-CNC thin liquid films under constant driving pressure. A total of three concentrations of surfactant and the corresponding mixtures of LAE with sulfated (sCNC) and carboxylated (cCNC) cellulose nanocrystals were studied. The sCNC and cCNC suspension with LAE formed thin films, with stability increasing with surfactant concentration and with complex rheological properties. In the presence of LAE, the aggregation of CNC was observed. While the sCNC aggregates were preferentially present in the film volume with a small fraction at the surface, the cCNC aggregates, due to their higher hydrophobicity, were preferentially located at film interfaces, forming compact layers. The presence of both types of aggregates decreased the stability of the thin liquid film compared to the one for the LAE solution with the same concentration. The addition of CNC to LAE was critical for foam formation, and foam stability was in qualitative agreement with the thin films' lifetimes. The foam volume increased with the LAE concentration. However, there was an optimum surfactant concentration to achieve stable foam. In particular, the very resistant foam was obtained with cCNC suspensions that formed the interfaces with a complex structure and rheology. On the other hand, at high LAE concentrations, the aggregates of CNC may exhibit antifoaming properties.
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Affiliation(s)
- Agnieszka Czakaj
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, ul. Niezapominajek 8, 30-239 Krakow, Poland
| | - Emmanouil Chatzigiannakis
- Polymer Technology Group, Department of Mechanical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Jan Vermant
- Department of Materials, ETH Zürich, Vladimir-Prelog-Weg 5, 8093 Zürich, Switzerland
| | - Marcel Krzan
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, ul. Niezapominajek 8, 30-239 Krakow, Poland
| | - Piotr Warszyński
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, ul. Niezapominajek 8, 30-239 Krakow, Poland
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5
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Kühnhammer M, Braun L, Ludwig M, Soltwedel O, Chiappisi L, von Klitzing R. A new model to describe small-angle neutron scattering from foams. J Appl Crystallogr 2022; 55:758-768. [PMID: 35974727 PMCID: PMC9348883 DOI: 10.1107/s1600576722004691] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Accepted: 05/02/2022] [Indexed: 12/01/2022] Open
Abstract
The modelling of scattering data from foams is very challenging due to the complex structure of foams and is therefore often reduced to the fitting of single peak positions or feature mimicking. This article presents a more elaborate model to describe the small-angle neutron scattering (SANS) data from foams. The model takes into account the geometry of the foam bubbles and is based on an incoherent superposition of the reflectivity curves arising from the foam films and the small-angle scattering (SAS) contribution from the plateau borders. The model is capable of describing the complete scattering curve of a foam stabilized by the standard cationic surfactant tetradecyltrimethylammonium bromide (C14TAB) with different water contents, i.e. different drainage states, and provides information on the thickness distribution of liquid films inside the foam. The mean film thickness decreases with decreasing water content because of drainage, from 28 to 22 nm, while the polydispersity increases. These results are in good agreement with the film thicknesses of individual horizontal foam films studied with a thin-film pressure balance.
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Affiliation(s)
- Matthias Kühnhammer
- Institut für Physik Kondensierter Materie, Technische Universität Darmstadt, Hochschulstraße 8, 64289 Darmstadt, Germany
| | - Larissa Braun
- Institut für Physik Kondensierter Materie, Technische Universität Darmstadt, Hochschulstraße 8, 64289 Darmstadt, Germany
| | - Michael Ludwig
- Institut für Physik Kondensierter Materie, Technische Universität Darmstadt, Hochschulstraße 8, 64289 Darmstadt, Germany
| | - Olaf Soltwedel
- Institut für Physik Kondensierter Materie, Technische Universität Darmstadt, Hochschulstraße 8, 64289 Darmstadt, Germany
| | | | - Regine von Klitzing
- Institut für Physik Kondensierter Materie, Technische Universität Darmstadt, Hochschulstraße 8, 64289 Darmstadt, Germany
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6
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Fauvel M, Trybala A, Tseluiko D, Starov VM, Bandulasena HCH. Stability of Two-Dimensional Liquid Foams under Externally Applied Electric Fields. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:6305-6321. [PMID: 35546544 PMCID: PMC9134501 DOI: 10.1021/acs.langmuir.2c00026] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Revised: 04/26/2022] [Indexed: 06/15/2023]
Abstract
Liquid foams are highly complex systems consisting of gas bubbles trapped within a solution of surfactant. Electroosmotic effects may be employed to induce fluid flows within the foam structure and impact its stability. The impact of external electric fields on the stability of a horizontally oriented monolayer of foam (2D foam) composed of anionic, cationic, non-ionic, and zwitterionic surfactants was investigated, probing the effects of changing the gas-liquid and solid-liquid interfaces. Time-lapse recordings were analyzed to investigate the evolution of foam over time subject to varying electric field strengths. Numerical simulations of electroosmotic flow of the same system were performed using the finite element method. Foam stability was affected by the presence of an external electric field in all cases and depended on the surfactant type, strength of the electric field, and the solid material used to construct the foam cell. For the myristyltrimethylammonium bromide (MTAB) foam in a glass cell, the time to collapse 50% of the foam was increased from ∼25 min under no electric field to ∼85 min under an electric field strength of 2000 V/m. In comparison, all other surfactants trialed exhibited faster foam collapse under external electric fields. Numerical simulations provided insight as to how different zeta potentials at the gas-liquid and solid-liquid interfaces affect fluid flow in different elements of the foam structure under external electric fields, leading to a more stable or unstable foam.
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Affiliation(s)
- Matthieu Fauvel
- Department
of Chemical Engineering, Loughborough University, Loughborough, Leicestershire, LE11 3TU, United Kingdom
| | - Anna Trybala
- Department
of Chemical Engineering, Loughborough University, Loughborough, Leicestershire, LE11 3TU, United Kingdom
| | - Dmitri Tseluiko
- Department
of Mathematics, Loughborough University, Loughborough, Leicestershire, LE11 3TU, United Kingdom
| | - Victor Mikhilovich Starov
- Department
of Chemical Engineering, Loughborough University, Loughborough, Leicestershire, LE11 3TU, United Kingdom
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7
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Suleymani M, Ashoori S, Ghotbi C, Moghadasi J, Kharrat R. Static and dynamic behavior of foam stabilized by modified nanoparticles: Theoretical and experimental aspects. Chem Eng Res Des 2020. [DOI: 10.1016/j.cherd.2020.04.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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8
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Suleymani M, Ghotbi C, Ashoori S, Moghadasi J, Kharrat R. Theoretical and experimental study of foam stability mechanism by nanoparticles: Interfacial, bulk, and porous media behavior. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.112739] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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9
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Blanc B, Bonhomme O, Brevet PF, Benichou E, Ybert C, Biance AL. Electroosmosis near surfactant laden liquid-air interfaces. SOFT MATTER 2018; 14:2604-2609. [PMID: 29492490 DOI: 10.1039/c7sm02508d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Generation of an electroosmostic (EO) flow near a liquid-gas interface covered with ionic surfactants is experimentally investigated. A combination of microscopic flow measurements with a molecular characterization of the interface by second harmonic generation (SHG) shows that under an electrical forcing, although a liquid flow is generated below the free surface, the surfactants remain immobile. The zeta potential was then determined and compared to the surfactant surface coverage. This combination of experimental techniques opens the route to simultaneously probe the liquid flow near a soapy interface and the corresponding surfactant repartition affecting the hydrodynamic boundary condition.
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Affiliation(s)
- Baptiste Blanc
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, Villeurbanne, F-69622, France.
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10
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Zheng J, Li Y, Zhao J, Wei T, Yang X, Chai J. Aggregation behavior and adsorption properties of salt-free catanionic surfactant mixtures containing tetradecyltrimethyl ammonium salts. J DISPER SCI TECHNOL 2018. [DOI: 10.1080/01932691.2018.1452756] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Jialin Zheng
- Key Laboratory of Fine Chemicals (Shandong Province), Qilu University of Technology, Ji’nan, China
| | - Yan Li
- Key Laboratory of Fine Chemicals (Shandong Province), Qilu University of Technology, Ji’nan, China
- College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Shandong Normal University, Ji’nan, China
| | - Jing Zhao
- Key Laboratory of Fine Chemicals (Shandong Province), Qilu University of Technology, Ji’nan, China
| | - Tao Wei
- Key Laboratory of Fine Chemicals (Shandong Province), Qilu University of Technology, Ji’nan, China
| | - Xiaodeng Yang
- Key Laboratory of Fine Chemicals (Shandong Province), Qilu University of Technology, Ji’nan, China
| | - Jinling Chai
- College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Shandong Normal University, Ji’nan, China
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11
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Streubel S, Schulze-Zachau F, Weißenborn E, Braunschweig B. Ion Pairing and Adsorption of Azo Dye/C 16TAB Surfactants at the Air-Water Interface. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2017; 121:27992-28000. [PMID: 29285205 PMCID: PMC5742476 DOI: 10.1021/acs.jpcc.7b08924] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Revised: 10/29/2017] [Indexed: 06/01/2023]
Abstract
Mixed layers of 6-hydroxy-5-[(4-sulfophenyl)azo]-2-naphthalenesulfonate (Sunset Yellow, SSY) and cetyltrimethylammonium bromide (C16TAB) at the air-water interface were studied using vibrational sum-frequency generation (SFG) and dynamic surface tension measurements. In the bulk, addition of C16TAB to SSY aqueous solution causes substantial changes in UV/vis absorption spectra, which originate from strong electrostatic interactions between the anionic SSY azo dye with the cationic C16TAB surfactant. These interactions are a driving force for the formation of SSY/C16TAB ion pairs. The latter are found to be highly surface active while free SSY molecules show no surface activity. Dynamic SFG as well as surface tension measurements at low SSY concentrations reveal that free C16TAB surfactants adsorb at the air-water interface on time scales <1 s where they initially form the dominating surface species, but on longer time scales free C16TAB is exchanged by SSY/C16TAB ion pairs. This causes a dramatic reduction of the surface tension to 35 mN/m but also in foam stability. These changes are accompanied by a substantial loss in SFG intensity from O-H stretching bands around 3200 and 3450 cm-1, which we relate to a decrease in surface charging due to adsorption of ion pairs with no or negligible net charges. For SSY/C16TAB molar ratios >0.5, the O-H bands in SFG spectra are reduced to very low intensities and are indicative to electrically neutral SSY/C16TAB ion pairs. This conclusion is corroborated by an analysis of macroscopic foams, which become highly instable in the presence of neutral SSY/C16TAB ion pairs. From an analysis of SFG spectra of air-water interfaces, we show that the electrostatic repulsion forces inside the ubiquitous foam films are reduced and thus remove the major stabilization mechanism within macroscopic foam.
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Affiliation(s)
- Saskia Streubel
- Institute of Physical Chemistry, Westfälische Wilhelms-Universität Münster, Corrensstrasse 28/30, 48149 Münster, Germany
| | - Felix Schulze-Zachau
- Institute of Physical Chemistry, Westfälische Wilhelms-Universität Münster, Corrensstrasse 28/30, 48149 Münster, Germany
| | - Eric Weißenborn
- Institute of Physical Chemistry, Westfälische Wilhelms-Universität Münster, Corrensstrasse 28/30, 48149 Münster, Germany
| | - Björn Braunschweig
- Institute of Physical Chemistry, Westfälische Wilhelms-Universität Münster, Corrensstrasse 28/30, 48149 Münster, Germany
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12
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Bonhomme O, Blanc B, Joly L, Ybert C, Biance AL. Electrokinetic transport in liquid foams. Adv Colloid Interface Sci 2017; 247:477-490. [PMID: 28662766 DOI: 10.1016/j.cis.2017.06.005] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2016] [Revised: 05/22/2017] [Accepted: 06/06/2017] [Indexed: 11/25/2022]
Abstract
Investigating electrokinetic transport in a liquid foam is at the confluence of two well developed research areas. On one hand, the study of electrokinetic flows (i.e. surface-driven flows generated close to a charged interface) is fairly well understood in regards the solid/liquid interface. On the other hand, the flow of liquid in a 3D deformable network, i.e a foam, under a volume force such as gravity has been thoroughly studied over the past decade. The overlapping zone of these two frameworks is of great interest for both communities as it gives rise to challenging new questions such as: what is the importance of the nature of the charged interface, created by mobile and soluble surfactants in the case of foam, on electrokinetic transport? How does a foam behave when submitted to a surface-driven flow? Can we compensate a volume-driven flow, i.e. gravity, by a surface-driven flow, i.e. electroosmosis? In this review, we will explore these questions on three different scales: a surfactant laden interface, a foam film and a macroscopic foam.
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13
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Briceño-Ahumada Z, Langevin D. On the influence of surfactant on the coarsening of aqueous foams. Adv Colloid Interface Sci 2017; 244:124-131. [PMID: 26687804 DOI: 10.1016/j.cis.2015.11.005] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2015] [Revised: 11/20/2015] [Accepted: 11/22/2015] [Indexed: 10/22/2022]
Abstract
We review the coarsening process of foams made with various surfactants and gases, focusing on physico-chemical aspects. Several parameters strongly affect coarsening: foam liquid fraction and foam film permeability, this permeability depending on the surfactant used. Both parameters may evolve with time: the liquid fraction, due to gravity drainage, and the film permeability, due to the decrease of capillary pressure during bubble growth, and to the subsequent increase in film thickness. Bubble coalescence may enhance the bubble's growth rate, in which case the bubble polydispersity increases. The differences found between the experiments reported in the literature and between experiments and theories are discussed.
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14
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Forces between silica particles in the presence of multivalent cations. J Colloid Interface Sci 2016; 472:108-15. [DOI: 10.1016/j.jcis.2016.03.043] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2016] [Revised: 03/11/2016] [Accepted: 03/18/2016] [Indexed: 11/22/2022]
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15
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Trefalt G, Behrens SH, Borkovec M. Charge Regulation in the Electrical Double Layer: Ion Adsorption and Surface Interactions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:380-400. [PMID: 26599980 DOI: 10.1021/acs.langmuir.5b03611] [Citation(s) in RCA: 168] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Charge regulation in the electrical double layer has important implications for ion adsorption, interparticle forces, colloidal stability, and deposition phenomena. Although charge regulation generally receives little attention, its consequences can be major, especially when considering interactions between unequally charged surfaces. The present article discusses common approaches to quantify such phenomena, especially within classical Poisson-Boltzmann theory, and pinpoints numerous situations where a consideration of charge regulation is essential. For the interpretation of interaction energy profiles, we advocate the use of the constant regulation approximation, which summarizes the surface properties in terms of two quantities, namely, the diffuse layer potential and the regulation parameter. This description also captures some pronounced regulation effects observed in the presence of multivalent ions.
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Affiliation(s)
- Gregor Trefalt
- Department of Inorganic and Analytical Chemistry, University of Geneva , Sciences II, 30 Quai Ernest-Ansermet, 1205 Geneva, Switzerland
| | - Sven Holger Behrens
- School of Chemical and Biomolecular Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332-0100, United States
| | - Michal Borkovec
- Department of Inorganic and Analytical Chemistry, University of Geneva , Sciences II, 30 Quai Ernest-Ansermet, 1205 Geneva, Switzerland
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16
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Fauser H, Uhlig M, Miller R, Klitzing RV. Surface Adsorption of Oppositely Charged SDS:C12TAB Mixtures and the Relation to Foam Film Formation and Stability. J Phys Chem B 2015; 119:12877-86. [DOI: 10.1021/acs.jpcb.5b06231] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Heiko Fauser
- Stranski-Laboratorium,
Department of Chemistry, Technische Universitaet Berlin, Strasse des 17.Juni
124, 10623 Berlin, Germany
| | - Martin Uhlig
- Stranski-Laboratorium,
Department of Chemistry, Technische Universitaet Berlin, Strasse des 17.Juni
124, 10623 Berlin, Germany
| | - Reinhard Miller
- Max Planck Institute of Colloids and Interfaces, Am Muehlenberg 1, 14424 Potsdam, Germany
| | - Regine von Klitzing
- Stranski-Laboratorium,
Department of Chemistry, Technische Universitaet Berlin, Strasse des 17.Juni
124, 10623 Berlin, Germany
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17
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Angarska JK, Ivanova DS, Manev ED. Drainage of foam films stabilized by nonionic, ionic surfactants and their mixtures. Colloids Surf A Physicochem Eng Asp 2015. [DOI: 10.1016/j.colsurfa.2015.04.043] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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18
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Bonhomme O, Mounier A, Simon G, Biance AL. Surface conductivity measurements in nanometric to micrometric foam films. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2015; 27:194118. [PMID: 25923979 DOI: 10.1088/0953-8984/27/19/194118] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Foam films (a liquid lamella in air covered by surfactants) are tools of choice for nanofluidic characterization as they are intrinsically nanometric. Their size is indeed fixed by a balance between external pressure and particular molecular interactions in the vicinity of interfaces. To probe the exact nature of these interfaces, different characterizations can be performed. Among them, conductivity in confined systems is a direct probe of the electrostatic environment in the vicinity of the surface. Therefore, we designed a dedicated experiment to measure this conductivity in a cylindrical bubble coupled to interferometry for film thickness characterization. We then show that this conductivity depends on the surfactant nature. These conductivity measurements have been performed in an extremely confined system, the so called Newton black foam films. Unexpectedly in this case, a conductivity close to surface conductivity is recovered.
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Affiliation(s)
- Oriane Bonhomme
- Institut Lumière Matière ILM, University Lyon 1-CNRS, UMR 5586, Domaine Scientifique de la Doua, Bâtiment Léon Brillouin 43 Boulevard du 11 Novembre 1918, 69622 Villeurbanne, France
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19
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Lee J, Nikolov A, Wasan D. Foam stability: The importance of film size and the micellar structuring phenomenon. CAN J CHEM ENG 2014. [DOI: 10.1002/cjce.22071] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Jongju Lee
- Department of Chemical and Biological Engineering; Illinois Institute of Technology; Chicago Illinois 60616
| | - Alex Nikolov
- Department of Chemical and Biological Engineering; Illinois Institute of Technology; Chicago Illinois 60616
| | - Darsh Wasan
- Department of Chemical and Biological Engineering; Illinois Institute of Technology; Chicago Illinois 60616
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20
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Schelero N, Miller R, von Klitzing R. Effect of oppositely charged hydrophobic additives (alkanoates) on the stability of C14TAB foam films. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2014.03.091] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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21
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Kessler A, Menéndez-Aguirre O, Hinrichs J, Stubenrauch C, Weiss J. Properties of an αs-casein-rich casein fraction: Influence of dialysis on surface properties, miscibility, and micelle formation. J Dairy Sci 2013; 96:5575-90. [DOI: 10.3168/jds.2013-6788] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2013] [Accepted: 06/08/2013] [Indexed: 11/19/2022]
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22
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Carey E, Patil SR, Stubenrauch C. Conductivity Measurements as a Method for Studying Ionic Technical Grade Surfactants. TENSIDE SURFACT DET 2013. [DOI: 10.3139/113.100368] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
The critical micellar concentrations (cmc) of cationic alkyltrimethylammonium bromides (C10TAB – C16TAB) and of anionic alkyl sulfates (SDS, technical grade Sulfopon 12G and Sulfopon 1214G) were determined using specific conductivity and surface tension measurements. While the cationic surfactants were purified, the anionic surfactants were used as received. In the former case, surface tension and conductivity measurements lead to the same cmc values. In the latter case, measuring the specific conductivities (bulk property) proved to be superior compared to measuring the surface tensions (surface property) because the presence of highly surface active impurities creates a pronounced minimum in the surface tension isotherm, which makes it impossible to determine an accurate value for the cmc. On the other hand, these impurities do not influence the conductivities, i. e. that the conductivities can be used to determine cmc values of impure and technical grade ionic surfactants, respectively. Moreover, an evaluation of the specific conductivities allows for the determination of the degree of micelle ionization (α) of the ionic surfactant solutions and thus provides additional useful information.
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23
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Li X, Karakashev SI, Evans GM, Stevenson P. Effect of environmental humidity on static foam stability. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:4060-4068. [PMID: 22303917 DOI: 10.1021/la205101d] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The quality of foaming products (such as beer and shampoo) and the performance of industrial processes that harness foam (such as the froth flotation of minerals or the foam fractionation of proteins) depend upon foam stability. In this study, experiments are performed to study the effect of environmental humidity on the collapse of static foams. The dependency of the rate at which a foam collapses upon humidity is demonstrated, and we propose a hypothesis for bubble bursting due to Marangoni instability induced by nonuniform evaporation to help explain the dependency. This hypothesis is supported by direct experimental observations of the bursting process of isolated bubbles by high speed video recording and the thinning of isolated foam films under different values of humidity and temperature by microinterferometric methods.
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Affiliation(s)
- Xueliang Li
- Centre for Advanced Particle Processing, University of Newcastle, Callaghan, NSW 2308, Australia
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24
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Kristen-Hochrein N, Laschewsky A, Miller R, von Klitzing R. Stability of Foam Films of Oppositely Charged Polyelectrolyte/Surfactant Mixtures: Effect of Isoelectric Point. J Phys Chem B 2011; 115:14475-83. [DOI: 10.1021/jp206964k] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Nora Kristen-Hochrein
- Stranski-Laboratorium, Insitut für Chemie, Technische Universität Berlin, Strasse des 17.Juni 124, 10623 Berlin, Germany
| | - André Laschewsky
- Institut für Chemie, Universität Potsdam, Karl-Liebknecht-Straße 24-25, 14476 Potsdam-Golm, Germany
| | - Reinhard Miller
- Max-Planck-Institut für Kolloid- und Grenzflächenforschung, Am Mühlenberg 1, 14476 Postdam-Golm, Germany
| | - Regine von Klitzing
- Stranski-Laboratorium, Insitut für Chemie, Technische Universität Berlin, Strasse des 17.Juni 124, 10623 Berlin, Germany
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25
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Foam films from mixed solutions of bovine serum albumin and n-dodecyl-β-d-maltoside. Colloids Surf A Physicochem Eng Asp 2011. [DOI: 10.1016/j.colsurfa.2011.01.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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26
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Ivanova D, Angarska Z, Karakashev S, Manev E. Drainage of foam films stabilized by n-dodecyl-β-d-maltoside or dodecyl trimethylammonium bromide and their mixtures. Colloids Surf A Physicochem Eng Asp 2011. [DOI: 10.1016/j.colsurfa.2011.01.058] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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27
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28
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Andersson G, Carey E, Stubenrauch C. Disjoining pressure study of formamide foam films stabilized by surfactants. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:7752-7760. [PMID: 20218554 DOI: 10.1021/la100586h] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A thin film pressure balance was used to investigate the disjoining pressure Pi as a function of the film thickness h of surfactant-stabilized formamide foam films. Nonionic (alkylpoly(ethylene glycol)s) and cationic surfactant (alkyltrimethylammonium bromides (C(n)TAB) with n = 14 and 16) solutions were studied in the absence and presence of electrolyte. The resulting Pi-h curves were fitted with the DLVO theory from which we extracted surface charge densities q(0) and surface potentials Psi(0). Investigating formamide foam films is of interest for studying the electrostatic component of the stabilizing forces in foam films. We know that the aqueous foam films are stabilized via electrostatic forces. In this case the self-dissociation of water contributes to the charges in the foam film. As formamide has a dissociation constant which is about 2 orders of magnitude lower than that of water, the number of charges in the solution due to self-dissociation is much smaller, which, in turn, should lead to lower electrostatic forces. Indeed, we found that formamide solutions of nonionic surfactants did not form stable foam films at concentrations below the critical micelle concentration. Regarding the cationic surfactants, the main difference between the formamide and the aqueous foam films is the fact that the concentration of ionic surfactants to form stable foam films is about 2 orders of magnitude higher compared to water. Consequently, the screening length for the electrostatic interaction and thus the film thickness are much smaller compared to films formed by the respective aqueous solutions.
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Affiliation(s)
- G Andersson
- School of Chemistry, Physics and Earth Science, Flinders University, Adelaide, Australia
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29
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Carey E, Stubenrauch C. A disjoining pressure study of foam films stabilized by mixtures of a nonionic (C12DMPO) and an ionic surfactant (C12TAB). J Colloid Interface Sci 2010; 343:314-23. [DOI: 10.1016/j.jcis.2009.11.026] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2009] [Revised: 09/18/2009] [Accepted: 11/11/2009] [Indexed: 10/20/2022]
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30
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31
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Stubenrauch C, Langevin D, Exerowa D, Manev E, Claesson PM, Boinovich LB, Klitzing RV. Comment on "Hydrophobic forces in the foam films stabilized by sodium dodecyl sulfate: effect of electrolyte" and subsequent criticism. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:12457-12460. [PMID: 17967038 DOI: 10.1021/la701208g] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Affiliation(s)
- Cosima Stubenrauch
- School of Chemical and Bioprocess Engineering, University College Dublin, Belfield, Dublin 4, Ireland.
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32
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Schulze-Schlarmann J, Stubenrauch C. Die Träume von den Schäumen. Detergenzien und Tenside. CHEM UNSERER ZEIT 2007. [DOI: 10.1002/ciuz.200700407] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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33
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Buchavzov N, Stubenrauch C. A disjoining pressure study of foam films stabilized by mixtures of nonionic and ionic surfactants. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:5315-23. [PMID: 17402764 DOI: 10.1021/la063642u] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Studying the disjoining pressure Pi as a function of the film thickness h (Pi-h curves) of foam films stabilized by ionic and nonionic surfactants, one finds that the surface charge density q0 of films stabilized by ionic surfactants increases with increasing surfactant concentration, while the opposite holds true for nonionic surfactants. Thus, it should be possible to tune the surface charge density with mixtures of nonionic and ionic surfactants. To address this question, we studied foam films stabilized by aqueous solutions of surfactant mixtures. The mixtures consisted of the nonionic beta-dodecylmaltoside (beta-C12G2) and the cationic dodecyl trimethylammonium bromide (C12TAB) with mixing ratios of beta-C12G2/C12TAB = 1:0, 50:1, 1:1, 1:50, 0:1. The addition of small amounts of C12TAB to beta-C12G2 first neutralizes the negative surface charge of the beta-C12G2 films and finally leads to a charge reversal from negatively to positively charged surfaces. On the other hand, by adding small amounts of beta-C12G2 to C12TAB, one observes the formation of stable CBFs which was also observed for the pure C12TAB. However, in contrast to the pure C12TAB, the resulting Pi-h curves for the mixtures cannot be described with the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory; the slope of the curves is too steep, and it barely changes with changing electrolyte concentration. A possible explanation for this observation will be given and discussed.
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Affiliation(s)
- Natalie Buchavzov
- Institut für Physikalische Chemie, Universität zu Köln, Luxemburger Str. 116, D-50939 Köln, Germany
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