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Born P, Braibanti M, Cristofolini L, Cohen-Addad S, Durian DJ, Egelhaaf SU, Escobedo-Sánchez MA, Höhler R, Karapantsios TD, Langevin D, Liggieri L, Pasquet M, Rio E, Salonen A, Schröter M, Sperl M, Sütterlin R, Zuccolotto-Bernez AB. Soft matter dynamics: A versatile microgravity platform to study dynamics in soft matter. Rev Sci Instrum 2021; 92:124503. [PMID: 34972443 DOI: 10.1063/5.0062946] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Accepted: 11/23/2021] [Indexed: 06/14/2023]
Abstract
We describe an experiment container with light scattering and imaging diagnostics for experiments on soft matter aboard the International Space Station (ISS). The suite of measurement capabilities can be used to study different materials in exchangeable sample cell units. The currently available sample cell units and future possibilities for foams, granular media, and emulsions are presented in addition to an overview of the design and the diagnostics of the experiment container. First results from measurements performed on ground and during the commissioning aboard the ISS highlight the capabilities of the experiment container to study the different materials.
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Affiliation(s)
- P Born
- Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR), 51170 Köln, Germany
| | - M Braibanti
- HE Space Operations BV for ESA, NL-2200AG Noordwijk, The Netherlands
| | - L Cristofolini
- CNR - Institute of Condensed Matter Chemistry and Technologies for Energy Unit of Genoa, 16149 Genova, Italy
| | - S Cohen-Addad
- Sorbonne Universités, UPMC Univ Paris 06, CNRS-UMR 7588, Institut des NanoSciences de Paris, 4 place Jussieu, 75005 Paris, France
| | - D J Durian
- Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - S U Egelhaaf
- Condensed Matter Physics Laboratory, Heinrich Heine University, 40225 Düsseldorf, Germany
| | - M A Escobedo-Sánchez
- Condensed Matter Physics Laboratory, Heinrich Heine University, 40225 Düsseldorf, Germany
| | - R Höhler
- Sorbonne Universités, UPMC Univ Paris 06, CNRS-UMR 7588, Institut des NanoSciences de Paris, 4 place Jussieu, 75005 Paris, France
| | - T D Karapantsios
- Department of Chemical Technology, School of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
| | - D Langevin
- Laboratoire de Physique des Solides, CNRS UMR 8502, Université de Paris Saclay, 91405 Orsay, France
| | - L Liggieri
- CNR - Institute of Condensed Matter Chemistry and Technologies for Energy Unit of Genoa, 16149 Genova, Italy
| | - M Pasquet
- Laboratoire de Physique des Solides, CNRS UMR 8502, Université de Paris Saclay, 91405 Orsay, France
| | - E Rio
- Laboratoire de Physique des Solides, CNRS UMR 8502, Université de Paris Saclay, 91405 Orsay, France
| | - A Salonen
- Laboratoire de Physique des Solides, CNRS UMR 8502, Université de Paris Saclay, 91405 Orsay, France
| | - M Schröter
- Max Planck Institute for Dynamics and Self-Organization, 37077 Göttingen, Germany
| | - M Sperl
- Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR), 51170 Köln, Germany
| | - R Sütterlin
- Department TESXS Science Systems Engineering, Airbus Defence and Space, Claude Dornier Str., 88090 Immenstaad, Germany
| | - A B Zuccolotto-Bernez
- Condensed Matter Physics Laboratory, Heinrich Heine University, 40225 Düsseldorf, Germany
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Langevin D. Light scattering by liquid surfaces, new developments. Adv Colloid Interface Sci 2021; 289:102368. [PMID: 33561568 DOI: 10.1016/j.cis.2021.102368] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Revised: 01/19/2021] [Accepted: 01/20/2021] [Indexed: 11/25/2022]
Abstract
The surface light scattering technique is presented, highlighting recent technical improvements and describing studies of various types of surfaces. The technique is non-invasive, but delicate to handle and no commercial instruments are available yet. The technique gives however interesting information difficult to obtain otherwise, for instance on out-of-equilibrium surfaces, surfaces of very low tension, or systems close to solidification. Many studies were performed with monolayers of surface-active molecules at the surface of water. In this case, surface viscoelastic parameters can be determined at high frequencies (10 kHz- 1 MHz), complementing usefully the data obtained at lower frequencies with other techniques. As with these other techniques, inconsistencies such as negative surface viscosities are sometimes reported. The origin of these anomalies is not yet fully clarified. The problem deserves further work, in order to achieve a satisfactory description of the motion of surfactant or polymer-laden surfaces.
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Abstract
Diffusing wave spectroscopy (DWS) was used to determine the size and volume fraction of nanoparticles within a foam taken as an example of a turbid media.
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Affiliation(s)
- A. Mikhailovskaya
- Laboratoire de Physique des Solides
- UMR 8502 Université Paris-Saclay
- 91405 Orsay cedex
- France
| | - J. Crassous
- Institut de Physique de Rennes
- UMR 6251
- Université de Rennes 1
- 35042 Rennes Cedex
- France
| | - A. Salonen
- Laboratoire de Physique des Solides
- UMR 8502 Université Paris-Saclay
- 91405 Orsay cedex
- France
| | - D. Langevin
- Laboratoire de Physique des Solides
- UMR 8502 Université Paris-Saclay
- 91405 Orsay cedex
- France
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Saulnier L, Drenckhan W, Larré PE, Anglade C, Langevin D, Janiaud E, Rio E. In situ measurement of the permeability of foam films using quasi-two-dimensional foams. Colloids Surf A Physicochem Eng Asp 2015. [DOI: 10.1016/j.colsurfa.2015.01.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Catapano ER, Lillo MP, García Rodríguez C, Natale P, Langevin D, Monroy F, López-Montero I. Thermomechanical transitions of egg-ceramide monolayers. Langmuir 2015; 31:3912-3918. [PMID: 25763506 DOI: 10.1021/acs.langmuir.5b00229] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Ceramides have unique biophysical properties. Their high melting temperature and their ability to form lateral domains have converted ceramides into the paradigm of rigid lipids. Here, using shear surface rheology of egg-ceramide Langmuir monolayers, a solid to fluid transition was evidenced as a vanishing shear rigidity at lower temperatures than the lipid melting temperature. Such a mechanical transition, which depends on the lipid lateral pressure, was found in a broad range temperature (40-50 °C). The solid to fluid transition was correlated to a LC to LC+LE phase transition, as confirmed by BAM experiments. Interestingly, together with the softening transition, a supercooling process compatible with a glassy behavior was found upon freezing. A new phase scenario is then depicted that broadens the mechanical behavior of natural ceramides. The phase diversity of ceramides might have important implications in their physiological roles.
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Affiliation(s)
- Elisa R Catapano
- †Departamento de Química Física I, Universidad Complutense, Ciudad Universitaria s/n, 28040 Madrid, Spain
- ‡Instituto de Investigación Hospital 12 de Octubre (i+12), Avda. de Córdoba s/n, 28041 Madrid, Spain
| | - M P Lillo
- §Grupo de Biofísica Molecular, Instituto Química Física Rocasolano, CSIC, Serrano 119, 28006 Madrid, Spain
| | - C García Rodríguez
- §Grupo de Biofísica Molecular, Instituto Química Física Rocasolano, CSIC, Serrano 119, 28006 Madrid, Spain
| | - P Natale
- †Departamento de Química Física I, Universidad Complutense, Ciudad Universitaria s/n, 28040 Madrid, Spain
- ‡Instituto de Investigación Hospital 12 de Octubre (i+12), Avda. de Córdoba s/n, 28041 Madrid, Spain
| | - D Langevin
- ∥Laboratoire de Physique des Solides, Université Paris-Sud, Rue Nicolas Appert Bâtiment 510, 91405 Orsay, France
| | - F Monroy
- †Departamento de Química Física I, Universidad Complutense, Ciudad Universitaria s/n, 28040 Madrid, Spain
- ‡Instituto de Investigación Hospital 12 de Octubre (i+12), Avda. de Córdoba s/n, 28041 Madrid, Spain
| | - I López-Montero
- †Departamento de Química Física I, Universidad Complutense, Ciudad Universitaria s/n, 28040 Madrid, Spain
- ‡Instituto de Investigación Hospital 12 de Octubre (i+12), Avda. de Córdoba s/n, 28041 Madrid, Spain
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Astafyeva K, Somaglino L, Desgranges S, Berti R, Patinote C, Langevin D, Lazeyras F, Salomir R, Polidori A, Contino-Pépin C, Urbach W, Taulier N. Perfluorocarbon nanodroplets stabilized by fluorinated surfactants: characterization and potentiality as theranostic agents. J Mater Chem B 2015; 3:2892-2907. [DOI: 10.1039/c4tb01578a] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
We aim to produce emulsions that can act as contrast agents and drug carriers for cancer imaging and therapy.
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Dahi A, Fatyeyeva K, Chappey C, Langevin D, Rogalsky SP, Tarasyuk OP, Marais S. Water sorption properties of room-temperature ionic liquids over the whole range of water activity and molecular states of water in these media. RSC Adv 2015. [DOI: 10.1039/c5ra14066h] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The water sorption behavior for various RTILs ([C4C1im][BF4], [C4C1im][PF6], [C6C1im][PF6], [C4im][DBP], [C4im][BEHP] and [Et3HN][CF3SO3]) was studied over the whole range of water activity using a continuous gravimetric method and ATR-IR measurements.
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Affiliation(s)
- A. Dahi
- Normandie Univ
- France
- Université de Rouen
- Laboratoire Polymères, Biopolymères, Surfaces
- 76821 Mont Saint Aignan cedex
| | - K. Fatyeyeva
- Normandie Univ
- France
- Université de Rouen
- Laboratoire Polymères, Biopolymères, Surfaces
- 76821 Mont Saint Aignan cedex
| | - C. Chappey
- Normandie Univ
- France
- Université de Rouen
- Laboratoire Polymères, Biopolymères, Surfaces
- 76821 Mont Saint Aignan cedex
| | - D. Langevin
- Normandie Univ
- France
- Université de Rouen
- Laboratoire Polymères, Biopolymères, Surfaces
- 76821 Mont Saint Aignan cedex
| | - S. P. Rogalsky
- Institute of Bioorganic Chemistry and Petrochemistry
- National Academy of Sciences of Ukraine
- 02160 Kyiv
- Ukraine
| | - O. P. Tarasyuk
- Institute of Bioorganic Chemistry and Petrochemistry
- National Academy of Sciences of Ukraine
- 02160 Kyiv
- Ukraine
| | - S. Marais
- Normandie Univ
- France
- Université de Rouen
- Laboratoire Polymères, Biopolymères, Surfaces
- 76821 Mont Saint Aignan cedex
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Caps H, Delon G, Vandewalle N, Guillermic R, Pitois O, Biance A, Saulnier L, Yazhgur P, Rio E, Salonen A, Langevin D. Does water foam exist in microgravity? ACTA ACUST UNITED AC 2014. [DOI: 10.1051/epn/2014303] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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Langevin D. Surface shear rheology of monolayers at the surface of water. Adv Colloid Interface Sci 2014; 207:121-30. [PMID: 24321860 DOI: 10.1016/j.cis.2013.10.030] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2013] [Revised: 10/25/2013] [Accepted: 10/29/2013] [Indexed: 11/18/2022]
Abstract
The knowledge of surface shear rheology is important to understand and model flow in systems where interfaces are present: multiphase flow, wetting, foaming and others. The topic has been investigated for more than 100 years, but the knowledge accumulated is still partial. The experimental devices used for the measurement of the viscoelastic parameters are delicate to operate and the response of the monolayers is complex, usually non-linear and time dependent. Furthermore, it is difficult to decouple from the response of the bulk liquid. Important discrepancies between microscopic and macroscopic methods were reported and remain to be clarified. The knowledge of shear properties does not suffice in general to achieve proper descriptions of the flow behavior and measurements of compression properties are needed as well. This paper presents examples taken from the literature and discusses the current level of understanding.
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Affiliation(s)
- D Langevin
- Laboratoire de Physique des Solides, Université Paris Sud 11, Bâtiment 510, 91405 Orsay, France
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11
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Langevin D, Vignes-Adler M. Microgravity studies of aqueous wet foams. Eur Phys J E Soft Matter 2014; 37:16. [PMID: 24652241 DOI: 10.1140/epje/i2014-14016-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2013] [Revised: 02/13/2014] [Accepted: 02/17/2014] [Indexed: 06/03/2023]
Abstract
Foams and foaming pose important questions and problems for both fundamental research and practical applications. Despite the fact that foams have been extensively studied, many aspects of foam physics and chemistry still remain unclear. Experiments on foams performed under microgravity can be extended far beyond their counterpart where gravity is fully present (i.e. most experiments on Earth). They allow, in particular, observation of the wet foams obtained during the foaming process; on Earth, foams at this stage evolve too quickly due to gravity drainage and cannot be studied. This paper reviews the existing studies of foams under microgravity, which include studies in parabolic flights, in sounding rockets and in the International Space Station.
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Affiliation(s)
- D Langevin
- Laboratoire de Physique des Solides, Université Paris Sud 11, Bâtiment 510, 91405, Orsay, France,
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12
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Heitkam S, Yoshitake Y, Toquet F, Langevin D, Salonen A. Speeding up of sedimentation under confinement. Phys Rev Lett 2013; 110:178302. [PMID: 23679787 DOI: 10.1103/physrevlett.110.178302] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2013] [Indexed: 06/02/2023]
Abstract
We show an increase of the sedimentation velocity as small particles are confined in circular capillaries. In general, confinement slows down sedimentation. But, we show that at low Reynolds numbers and in 1D confinement this is not the case. Particle sedimentation velocity is not homogeneous, which can lead to the formation of structures. These structures are enhanced and stabilized in the presence of walls and in the absence of other dissipative mechanisms. As a consequence, it is possible to achieve sedimentation velocities that even exceed the Stokes velocity. The segregation at critical capillary diameters has been directly observed using a large scale model. These simple experiments offer a new insight into the old problem of sedimentation under confinement.
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Affiliation(s)
- S Heitkam
- Laboratoire de Physique des Solides, UMR 8502, Université Paris Sud, 91405 Orsay, France
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13
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Testouri A, Arriaga L, Honorez C, Ranft M, Rodrigues J, van der Net A, Lecchi A, Salonen A, Rio E, Guillermic RM, Langevin D, Drenckhan W. Generation of porous solids with well-controlled morphologies by combining foaming and flow chemistry on a Lab-on-a-Chip. Colloids Surf A Physicochem Eng Asp 2012. [DOI: 10.1016/j.colsurfa.2012.02.048] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Vandewalle N, Caps H, Delon G, Saint-Jalmes A, Rio E, Saulnier L, Adler M, Biance AL, Pitois O, Addad SC, Hohler R, Weaire D, Hutzler S, Langevin D. Foam stability in microgravity. ACTA ACUST UNITED AC 2011. [DOI: 10.1088/1742-6596/327/1/012024] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Langevin D, Marquez-Beltran C, Delacotte J. Surface force measurements on freely suspended liquid films. Adv Colloid Interface Sci 2011; 168:124-34. [PMID: 21561596 DOI: 10.1016/j.cis.2011.03.007] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2010] [Revised: 03/15/2011] [Accepted: 03/21/2011] [Indexed: 10/18/2022]
Abstract
This paper reviews existing studies of freely suspended liquid films, focusing on the role of the forces between surfaces. The important role of kinetics phenomena is discussed. Examples of studies making use of solutions containing surfactants, proteins and particles are compared. The different aspects of film lifetime are discussed, from film formation to film rupture. A comparison with the few existing theories is also made.
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Zhou C, Langevin D, Guillot S. Internal organisation in polyelectrolytes/oppositely charged surfactants colloidal complexes anticipating precipitated nanostructures. Eur Phys J E Soft Matter 2011; 34:70. [PMID: 21809184 DOI: 10.1140/epje/i2011-11070-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2011] [Revised: 06/06/2011] [Accepted: 06/14/2011] [Indexed: 05/31/2023]
Abstract
In this paper, we relate the periodic nanostructures found in the colloidal complexes and the concentrated phases obtained with polyelectrolyte/surfactant aqueous solutions. We present small-angle X-ray scattering studies of the self-organisation of the anionic polymer carboxymethylcellulose with three cationic quaternary ammonium surfactants with different head and tail groups: hexadecyl trimethyl, hexadecyl ethyl dimethyl and didodecyl dimethyl ammonium bromides. We investigated the mesophases obtained above a precipitation threshold. The mixed solutions with the double-chained surfactant led to lamellar phases, in which the repeat distance only depends on the surfactant/carboxyl charge molar ratio. We show that an internal lamellar organisation already takes place in the dilute phase containing colloidal complexes found below the precipitation threshold.
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Affiliation(s)
- C Zhou
- Centre de Recherche sur la Matière Divisée, UMR 6619, Université d'Orléans-CNRS, 1b rue de la Férollerie, 45071 Orléans Cedex 2, France
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Zang D, Rio E, Delon G, Langevin D, Wei B, Binks B. Influence of the contact angle of silica nanoparticles at the air–water interface on the mechanical properties of the layers composed of these particles. Mol Phys 2011. [DOI: 10.1080/00268976.2010.542778] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Affiliation(s)
- A. Testouri
- Laboratoire de Physique des Solides, Université Paris-Sud, UMR8502 Orsay, France
| | - C. Honorez
- Laboratoire de Physique des Solides, Université Paris-Sud, UMR8502 Orsay, France
| | - A. Barillec
- Laboratoire de Physique des Solides, Université Paris-Sud, UMR8502 Orsay, France
| | - D. Langevin
- Laboratoire de Physique des Solides, Université Paris-Sud, UMR8502 Orsay, France
| | - W. Drenckhan
- Laboratoire de Physique des Solides, Université Paris-Sud, UMR8502 Orsay, France
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Alexandre B, Colasse L, Langevin D, Médéric P, Aubry T, Chappey C, Marais S. Transport Mechanisms of Small Molecules through Polyamide 12/Montmorillonite Nanocomposites. J Phys Chem B 2010; 114:8827-37. [DOI: 10.1021/jp911666b] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- B. Alexandre
- Université de Rouen, Laboratoire Polymères, Biopolymères, Surfaces, UMR6270 CNRS & FR 3038, 76821 Mont-Saint-Aignan Cedex, France, and Equipe Rhéologie du LIMATB EA4250, Université de Bretagne Occidentale, 6 Av. Le Gorgeu, C.S. 93837, 29238 Brest Cedex 3, France
| | - L. Colasse
- Université de Rouen, Laboratoire Polymères, Biopolymères, Surfaces, UMR6270 CNRS & FR 3038, 76821 Mont-Saint-Aignan Cedex, France, and Equipe Rhéologie du LIMATB EA4250, Université de Bretagne Occidentale, 6 Av. Le Gorgeu, C.S. 93837, 29238 Brest Cedex 3, France
| | - D. Langevin
- Université de Rouen, Laboratoire Polymères, Biopolymères, Surfaces, UMR6270 CNRS & FR 3038, 76821 Mont-Saint-Aignan Cedex, France, and Equipe Rhéologie du LIMATB EA4250, Université de Bretagne Occidentale, 6 Av. Le Gorgeu, C.S. 93837, 29238 Brest Cedex 3, France
| | - P. Médéric
- Université de Rouen, Laboratoire Polymères, Biopolymères, Surfaces, UMR6270 CNRS & FR 3038, 76821 Mont-Saint-Aignan Cedex, France, and Equipe Rhéologie du LIMATB EA4250, Université de Bretagne Occidentale, 6 Av. Le Gorgeu, C.S. 93837, 29238 Brest Cedex 3, France
| | - T. Aubry
- Université de Rouen, Laboratoire Polymères, Biopolymères, Surfaces, UMR6270 CNRS & FR 3038, 76821 Mont-Saint-Aignan Cedex, France, and Equipe Rhéologie du LIMATB EA4250, Université de Bretagne Occidentale, 6 Av. Le Gorgeu, C.S. 93837, 29238 Brest Cedex 3, France
| | - C. Chappey
- Université de Rouen, Laboratoire Polymères, Biopolymères, Surfaces, UMR6270 CNRS & FR 3038, 76821 Mont-Saint-Aignan Cedex, France, and Equipe Rhéologie du LIMATB EA4250, Université de Bretagne Occidentale, 6 Av. Le Gorgeu, C.S. 93837, 29238 Brest Cedex 3, France
| | - S. Marais
- Université de Rouen, Laboratoire Polymères, Biopolymères, Surfaces, UMR6270 CNRS & FR 3038, 76821 Mont-Saint-Aignan Cedex, France, and Equipe Rhéologie du LIMATB EA4250, Université de Bretagne Occidentale, 6 Av. Le Gorgeu, C.S. 93837, 29238 Brest Cedex 3, France
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Chatenay D, Langevin D, Meunier J, Bourbon D, Lalanne P, Bellocq A. MEASUREMENTOF LOW INTERFACIALTENSION, COMPARISONBETWEENALIGHTSCATTERINGTECHNIQUEAND THESPINNING DROP TECHNIQUE. J DISPER SCI TECHNOL 2010. [DOI: 10.1080/01932698208943640] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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von Klitzing R, Thormann E, Nylander T, Langevin D, Stubenrauch C. Confinement of linear polymers, surfactants, and particles between interfaces. Adv Colloid Interface Sci 2010; 155:19-31. [PMID: 20206329 DOI: 10.1016/j.cis.2010.02.003] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2009] [Revised: 02/02/2010] [Accepted: 02/03/2010] [Indexed: 11/27/2022]
Abstract
The review addresses the effect of geometrical confinement on the structure formation of colloidal dispersions like particle suspensions, (non)micellar surfactant solutions, polyelectrolyte solutions and mixed dispersions. The dispersions are entrapped either between two fluid interfaces (foam film) in a Thin Film Pressure Balance (TFPB) or between two solid interfaces in a Colloidal Probe Atomic Force Microscope (Colloidal Probe AFM) or a Surface Force Apparatus (SFA). The oscillating concentration profile in front of the surface leads to an oscillating force during film thinning. It is shown that the characteristic lengths like the distance between particles, the distance between micelles, or the mesh size of the polymer network remain the same during the confining process. The influence of different parameters like ionic strength, molecular structure, and the properties of the outer surfaces on the structure formation are reported. The confinement of mixed dispersions might lead to phase separation and capillary condensation, which in turn causes a pronounced attraction between the two opposing film surfaces.
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Bain C, Claesson P, Langevin D, Meszaros R, Nylander T, Stubenrauch C, Titmuss S, von Klitzing R. Complexes of surfactants with oppositely charged polymers at surfaces and in bulk. Adv Colloid Interface Sci 2010; 155:32-49. [PMID: 20167304 DOI: 10.1016/j.cis.2010.01.007] [Citation(s) in RCA: 184] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2009] [Revised: 01/14/2010] [Accepted: 01/15/2010] [Indexed: 11/28/2022]
Abstract
Addition of surfactants to aqueous solutions of polyelectrolytes carrying an opposite charge causes the spontaneous formation of complexes in the bulk phase in certain concentration ranges. Under some conditions, compact monodisperse multichain complexes are obtained in the bulk. The size of these complexes depends on the mixing procedure and it can be varied in a controlled way from nanometers up to micrometers. The complexes exhibit microstructures analogous to those of the precipitates formed at higher concentrations. In other cases, however, the bulk complexes are large, soft and polydisperse. In most cases, the dispersions are only kinetically stable and exhibit pronounced non-equilibrium features. Association at air-water interfaces readily occurs, even at very small concentrations. When the surfactant concentration is small, the surface complexes are usually made of a surfactant monolayer to which the polymer binds and adsorbs in a flat-like configuration. However, under some conditions, thicker layers can be found, with bulk complexes sticking to the surface. The association at solid-water interfaces is more complex and depends on the specific interactions between surfactants, polymers and the surface. However, the behaviour can be understood if distinctions between hydrophilic surfaces and hydrophobic surfaces are made. Note that the behaviour at air-water interfaces is closer to that of hydrophobic than that of hydrophilic solid surfaces. The relation between bulk and surface complexation will be discussed in this review. The emphasis will be given to the results obtained by the teams of the EC-funded Marie Curie RTN "SOCON".
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Zang DY, Rio E, Langevin D, Wei B, Binks BP. Viscoelastic properties of silica nanoparticle monolayers at the air-water interface. Eur Phys J E Soft Matter 2010; 31:125-134. [PMID: 20151313 DOI: 10.1140/epje/i2010-10565-7] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2009] [Revised: 12/04/2009] [Indexed: 05/28/2023]
Abstract
We have investigated the rheological behaviour of silica nanoparticle layers at the air-water interface. Both compressed and deposited layers have been studied in Langmuir troughs and with a bicone rheometer. The compressed layers are more homogeneous and rigid, and the elastic response to continuous, step and oscillatory compression are similar, provided the compression is fast enough and relaxation is prevented. The deposited layers are less rigid and more viscoelastic. Their shear moduli deduced from the oscillatory uniaxial compression are much smaller than those deduced from pure shear deformation suggesting that the effective shear rate is smaller than expected in the compression measurements.
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Affiliation(s)
- D Y Zang
- Laboratoire de Physique des Solides, Université Paris-Sud, UMR CNRS 8502, Bâtiment 510, 91405, Orsay cedex, France
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Maestro A, Langevin D, Monroy F. Amorphous freezing in two dimensions: from soft coils to rigid particles. Eur Phys J E Soft Matter 2010; 31:89-94. [PMID: 20101518 DOI: 10.1140/epje/i2010-10554-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2009] [Revised: 11/17/2009] [Accepted: 12/10/2009] [Indexed: 05/28/2023]
Abstract
The topic of the gel transition in two dimensions is revisited by considering data on the shear elasticity of Langmuir monolayers of different spherical objects. Amorphous freezing can be associated to structural percolation in a lattice able to resist shear stresses. The shear modulus and its dependence on the packing fraction are found to strongly depend on the details of the interaction potential and largely differ from expectations for entropic networks. This behaviour can be interpreted in terms of more elaborated percolation theories including central forces and bond-bending forces.
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Affiliation(s)
- A Maestro
- Departamento de Química Física I, Universidad Complutense, Madrid, Spain
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Ben Hamouda S, Langevin D, Roudesli S. Elaboration of novel polymeric blends with in-situ formation of metallic nanoparticles: water vapour transport properties. ACTA ACUST UNITED AC 2009. [DOI: 10.1016/j.phpro.2009.11.017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Alvarez G, Jestin J, Argillier JF, Langevin D. Small-angle neutron scattering study of crude oil emulsions: structure of the oil-water interfaces. Langmuir 2009; 25:3985-3990. [PMID: 19714887 DOI: 10.1021/la802736c] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We have used SANS techniques to study in situ interfaces between crude oil and water in emulsions. These emulsions were stabilized by asphaltenes, which are natural surface-active molecules in viscous crude oils. By combining SANS and UV-vis spectrometry, we measured both the interfacial thickness and the adsorbed amount as well as the size of the asphaltene aggregates in the oil phase. We found that this size is comparable to the interfacial thickness, suggesting that the interface is covered by adsorbed aggregates. The thickness is a minimum at the pH at which the charge of asphaltenes in contact with water is zero (IEP). This suggests that asphaltene layers in contact with water are swollen and stretched at both low and high pH. The effect of salt addition on the interfacial characteristics is minor at the IEP, but a clear swelling is seen at high pH for 0.1 M salt, an effect that remains to be understood. Emulsion stability was found to correlate well with large interfacial thicknesses.
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Affiliation(s)
- G Alvarez
- Institut Français du Pétrole, 1-4 avenue de Bois Préau, 92852 Rueil-Malmaison Cedex, France
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Kundu S, Langevin D, Lee LT. Neutron reflectivity study of the complexation of DNA with lipids and surfactants at the surface of water. Langmuir 2008; 24:12347-12353. [PMID: 18828609 DOI: 10.1021/la801465p] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Complexation of lipids and surfactants with short DNA fragments at the air-water interface has been studied by neutron reflectivity. Complexation with zwitterionic lipids occurs in the presence of divalent cations, and ion specificity has been demonstrated (binding is less effective with Ba2+ than with Mg2+ or Ca2+). One and two DNA layers have been observed for dilute and more compact lipid monolayers, respectively. Two DNA layers have also been found with the soluble cationic surfactant dodecyltrimethylammonium bromide (DTAB), except close to the precipitation boundary. This result is opposite to that found in ellipsometry where very thick layers are found in this region. It is possible that the ellipsometry signal is due to highly hydrated bulk complexes adsorbing at the surface, not seen by neutrons because of unfavorable contrast conditions. Long DNA was found to be less keen to form surface complexes than short DNA fragments.
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Affiliation(s)
- S Kundu
- Laboratoire de Physique des Solides, Université Paris Sud, CNRS, UMR, Orsay, France
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Cervantes Martinez A, Rio E, Delon G, Saint-Jalmes A, Langevin D, Binks BP. On the origin of the remarkable stability of aqueous foams stabilised by nanoparticles: link with microscopic surface properties. Soft Matter 2008; 4:1531-1535. [PMID: 32907121 DOI: 10.1039/b804177f] [Citation(s) in RCA: 95] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
We have performed a quantitative study of the coarsening of foams stabilised by partially hydrophobic silica nanoparticles. We have used a variety of techniques: optical and electron microscopy, microfluidics, and multiple light scattering. Using earlier studies of planar particle monolayers, we have been able to correlate the interfacial properties and the macroscopic temporal evolution of the foam. This has shed light on the origin of the absence of coarsening of particle-stabilised foams. Such particle-stabilised foams appear to be the only known foam system where coarsening is inhibited by surface elasticity.
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Affiliation(s)
- A Cervantes Martinez
- Laboratoire de Physique des Solides, UMR CNRS 8502, Université Paris Sud, 91405, Orsay, France
| | - E Rio
- Laboratoire de Physique des Solides, UMR CNRS 8502, Université Paris Sud, 91405, Orsay, France
| | - G Delon
- Laboratoire de Physique des Solides, UMR CNRS 8502, Université Paris Sud, 91405, Orsay, France
| | - A Saint-Jalmes
- Institut de Physique de Rennes, UMR 6251, Université Rennes 1, Rennes, 35042, France
| | - D Langevin
- Laboratoire de Physique des Solides, UMR CNRS 8502, Université Paris Sud, 91405, Orsay, France
| | - B P Binks
- Surfactant & Colloid Group, Department of Chemistry, University of Hull, Hull, HU6 7RX, UK
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Abstract
Functionalized polydomain chiral elastomers were obtained by cross-linking side-chain liquid crystalline polysiloxanes bearing acid functions. Sorption experiments were performed by the use of an electronic microbalance, in the presence of one enantiomer of a chiral amine molecule, able to interact with the acid groups. The results showed that Fick's diffusion law is not valid anymore as soon as an interaction between the material and the molecule is present. Moreover, it was demonstrated that the grafting of interacting groups on a chiral elastomer enhanced both the capacity and selectivity toward one enantiomer.
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Affiliation(s)
- G Palaprat
- Laboratoire Interactions Moléculaires et Réactivité Chimique et Photochimique, Université de Toulouse (Paul Sabatier), IMRCP UMR CNRS 5623, 31062 Toulouse cedex 9, France
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Safouane M, Langevin D, Binks BP. Effect of particle hydrophobicity on the properties of silica particle layers at the air-water interface. Langmuir 2007; 23:11546-11553. [PMID: 17918972 DOI: 10.1021/la700800a] [Citation(s) in RCA: 97] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
This article describes a study of fumed silica particle layers adsorbed at the air-water interface. We have performed surface pressure, ellipsometry, and Brewster angle microscopy measurements. These determinations were complemented by surface viscoelasticity studies, using capillary waves to measure the compression moduli and an oscillating disc to measure the shear moduli. Our results show a strong influence of the particle hydrophobicity and surface density on the properties of the layers. Under compression-expansion, the particle layers rearrange quasi-instantaneously, and at high density, they buckle and/or collapse. Shear measurements show a transition from viscous to elastic behavior for particles with contact angles close to 90 degrees. The surface compression moduli are quite small and most likely not related to the stability of the foams made with these particles, in contrast to the case of more common surfactant foams.
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Affiliation(s)
- M Safouane
- Laboratoire de Physique des Solides, Université Paris 11, 91405 Orsay, France
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Palaprat G, Marty JD, Langevin D, Finkelmann H, Mauzac M. Enantioselective Absorption of Chirally Doped Liquid Crystalline Networks Studied by the Use of an Electronic Microbalance. J Phys Chem B 2007; 111:9239-43. [PMID: 17636978 DOI: 10.1021/jp071711n] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A polydomain cholesteric elastomer was obtained by cross-linking a nematic side-chain polysiloxane in the presence of a chiral dopant. After extraction of the chiral dopant, sorption experiments were performed, by the use of an electronic microbalance, in the presence of each enantiomer of a chiral amine molecule. The sorption kinetics corresponds to a Fickian diffusion behavior. They allowed us to determine the diffusion coefficients and to show that the doped polymer has a more pronounced affinity toward one of the enantiomers.
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Affiliation(s)
- G Palaprat
- Laboratoire Interactions Moléculaires et Réactivité Chimique et Photochimique, UMR CNRS 5623, Université Paul Sabatier, 31062 Toulouse cedex 9, France
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Trabelsi S, Guillot S, Ritacco H, Boué F, Langevin D. Nanostructures of colloidal complexes formed in oppositely charged polyelectrolyte/surfactant dilute aqueous solutions. Eur Phys J E Soft Matter 2007; 23:305-11. [PMID: 17687512 DOI: 10.1140/epje/i2006-10192-y] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2006] [Accepted: 06/12/2007] [Indexed: 05/16/2023]
Abstract
Small-angle neutron scattering measurements were performed on dilute solutions of carboxymethylcellulose/DTAB complexes in water in order to determine their size, shape and internal structures. At low polymer content, the complexes are spherical, rather monodisperse and probably made of polymer chains intercalated between surfactant micelles. Moreover, we show that these micelles have a similar cubic arrangement than found in polymer/surfactant precipitates formed at higher surfactant concentrations. At larger polymer content, in the semi-dilute polyelectrolyte regime, the complexes are larger, softer and polydisperse. However, they possess a similar internal structure in both regimes. Carboxymethylcellulose/CTAB complexes are also large, soft and polydisperse but do not seem to exhibit well-defined internal structures.
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Affiliation(s)
- S Trabelsi
- Laboratoire de Physique des Solides, Université Paris-Sud, Bâtiment 510, 91405 Orsay Cedex, France
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36
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Maldonado A, Ober R, Gulik-Krzywicki T, Urbach W, Langevin D. The sponge phase of a mixed surfactant system. J Colloid Interface Sci 2007; 308:485-90. [PMID: 17266977 DOI: 10.1016/j.jcis.2007.01.012] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2006] [Revised: 01/05/2007] [Accepted: 01/06/2007] [Indexed: 11/25/2022]
Abstract
We study the sponge phase of the mixed non-ionic/ionic surfactant system C14DMAO-TTAB-hexanol-brine. Our aim is to determine if this phase exists in this mixed system and if it preserves or changes its structure when the relative amount of the charged surfactant is increased in the mixture. SAXS, FFEM, and conductivity results show that for the same bilayer volume fraction the sponge phase preserves its global structure. We propose a method to determine the geometrical obstruction factor from electrical conductivity measurements in ionic sponge phases. Analysis of lamellar phases in the same system shows that the bilayer thickness increases when the ionic surfactant concentration is increased.
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Affiliation(s)
- A Maldonado
- Departamento de Física, Universidad de Sonora, Apdo. Postal 1626, 83000 Hermosillo, Sonora, Mexico.
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37
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Saint-Jalmes A, Marze S, Ritacco H, Langevin D, Bail S, Dubail J, Guingot L, Roux G, Sung P, Tosini L. Diffusive liquid propagation in porous and elastic materials: the case of foams under microgravity conditions. Phys Rev Lett 2007; 98:058303. [PMID: 17358910 DOI: 10.1103/physrevlett.98.058303] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2006] [Indexed: 05/14/2023]
Abstract
We report the results of fluid transport experiments in aqueous foams under microgravity. Using optical and electrical methods, the capillary motion of the foam fluid and the local liquid fractions are monitored. We show that foams can be continuously wetted up to high liquid fractions ( approximately 0.3), without any bubble motion instabilities. Data are compared to drainage models: For liquid fractions above 0.2, discrepancies are found and identified. These new results on foam hydrodynamics and structure can be useful for other poroelastic materials, such as plants and biological tissues.
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Affiliation(s)
- A Saint-Jalmes
- Groupe Matière Condensée et Matériaux, Université Rennes 1, Rennes, France
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Abstract
We investigated the interaction between an anionic polyelectrolyte (carboxymethylcellulose) and cationic surfactants (DTAB, TTAB, and CTAB) at the air/water interface, using surface tension, ellipsometry, and Brewster angle microscopy techniques. At low surfactant concentration, a synergistic phenomenon is observed due to the co-adsorption of polyelectrolyte/surfactant complexes at the interface, which decreases the surface tension. When the surfactant critical aggregation concentration (cac) is reached, the adsorption saturates and the thickness of the adsorbed monolayer remains constant until another characteristic surfactant concentration, C0, is reached, at which all the polymer charges are bound to surfactant in bulk. Above C0, the absorbed monolayer becomes much thicker, suggesting adsorption of bulk aggregates, which have become more hydrophobic due to charge neutralization.
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Affiliation(s)
- S Trabelsi
- Laboratoire de Physique des Solides, Université Paris Sud, Bâtiment 510, 91405 Orsay, France
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40
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Langevin D, Asnacios A, Argillier JF, Bergeron V. Anionic Polyelectrolyte-Cationic Surfactant Interactions in Aqueous Solutions and Foam Films Stability. ACTA ACUST UNITED AC 2006. [DOI: 10.2516/ogst:1997012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Maurdev G, Saint-Jalmes A, Langevin D. Bubble motion measurements during foam drainage and coarsening. J Colloid Interface Sci 2006; 300:735-43. [PMID: 16677666 DOI: 10.1016/j.jcis.2006.03.079] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2005] [Revised: 03/27/2006] [Accepted: 03/31/2006] [Indexed: 10/24/2022]
Abstract
We have studied bubble motion within a column of foam allowed to undergo free drainage. We have measured bubble motion upward with time and as a function of their initial positions. Depending on the gas used, which sets the coarsening and drainage rates, different bubble upward motion types have been identified (constant speed, acceleration or deceleration) and explained in relation with liquid downward flows. The proofs of the consistency between bubble upward motion and liquid downward flow are obtained both by comparing the bubble motion curves to the liquid drainage ones, and by comparing the time variations of the liquid fraction extracted from bubble motion to direct liquid fraction measurements by electrical conductimetry. The agreement between bubble position tracking and electrical conductivity shows in particular that it is possible to determine the drainage regime from such simple bubble motion measurements. This work also allowed us to demonstrate a special case of foam coarsening and expansion, occurring when the foam gas is less soluble than the outside one, caused by diffusion of this external gas into the foam. All these results allow us to build a picture of drainage and coarsening seen from the bubble point of view.
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Affiliation(s)
- G Maurdev
- Laboratoire de Physique des Solides, Université Paris-Sud, 91405 Orsay Cedex, France
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44
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Safouane M, Saint-Jalmes A, Bergeron V, Langevin D. Viscosity effects in foam drainage: Newtonian and non-newtonian foaming fluids. Eur Phys J E Soft Matter 2006; 19:195-202. [PMID: 16505946 DOI: 10.1140/epje/e2006-00025-4] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2005] [Indexed: 05/06/2023]
Abstract
We have studied the drainage of foams made from Newtonian and non-Newtonian solutions of different viscosities. Forced-drainage experiments first show that the behavior of Newtonian solutions and of shear-thinning ones (foaming solutions containing either Carbopol or Xanthan) are identical, provided one considers the actual viscosity corresponding to the shear rate found inside the foam. Second, for these fluids, a drainage regime transition occurs as the bulk viscosity is increased, illustrating a coupling between surface and bulk flow in the channels between bubbles. The properties of this transition appear different from the ones observed in previous works in which the interfacial viscoelasticity was varied. Finally, we show that foams made of solutions containing long flexible PolyEthylene Oxide (PEO) molecules counter-intuitively drain faster than foams made with Newtonian solutions of the same viscosity. Complementary experiments made with fluids having all the same viscosity but different responses to elongational stresses (PEO-based Boger fluids) suggest an important role of the elastic properties of the PEO solutions on the faster drainage.
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Affiliation(s)
- M Safouane
- Laboratoire de Physique des Solides, Université Paris-Sud, 91405, Orsay, France
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46
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Abstract
We studied the dynamics of two different types of domain shape relaxation in a stratifying foam film composed of an anionic polymer and cationic surfactant. Those films thin in stepwise fashion: circular domains of lower film thickness are formed, expand and coalesce until they cover the whole film surface. We found that the shape relaxation of coalescing domains is governed only by 2D dissipation, and the measurement of the time scales allows to determine the ratio between the driving force (line tension) and local film viscosity. Further, we analyzed the withdrawal of stripes and modeled it by a moving disc pulled by an external force. Here, 3D dissipation can not be neglected (Stokes paradox) and the equilibrium velocity depends logarithmically on the viscosity of the surrounding 3D air. The evaluation of both kinds of relaxation events yields the orders of magnitude of film viscosity and line tension. For the investigated system we found that the film viscosity is at least 30 times larger than the bulk viscosity, which can be explained by the local molecular ordering and strong interactions with film surfaces.
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Affiliation(s)
- P Heinig
- Laboratoire de Physique des Solides, UMR 8502, Université Paris-Sud, Bât. 510, 91405 Orsay, France.
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47
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Saint-Jalmes A, Peugeot ML, Ferraz H, Langevin D. Differences between protein and surfactant foams: Microscopic properties, stability and coarsening. Colloids Surf A Physicochem Eng Asp 2005. [DOI: 10.1016/j.colsurfa.2005.02.002] [Citation(s) in RCA: 128] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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McLoughlin D, Dias R, Lindman B, Cardenas M, Nylander T, Dawson K, Miguel M, Langevin D. Surface complexation of DNA with insoluble monolayers. Influence of divalent counterions. Langmuir 2005; 21:1900-1907. [PMID: 15723487 DOI: 10.1021/la047700s] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
DNA interacts with insoluble monolayers made of cationic amphiphiles as well as with monolayers of zwitterionic lipids in the presence of divalent ions. Binding to dioctadecyldimethylammonium bromide (DODAB) or distearoyl-sn-glycero-3-phosphocholine (DSPC) monolayers in the presence of calcium is accompanied by monolayer expansion. For the positively charged DODAB monolayer, this causes a decrease of surface potential, while an increase is observed for the DSPC monolayers. Binding to dipalmitoyl-sn-glycero-3-phosphocholine preserves most of the liquid expanded-liquid condensed coexistence region. The liquid condensed domains adopt an elongated morphology in the presence of DNA, especially in the presence of calcium. The interaction of DNA with phospholipid monolayers is ion specific: the presence of calcium leads to a stronger interaction than magnesium and barium. These results were confirmed by bulk complexation studies.
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Affiliation(s)
- D McLoughlin
- Laboratoire de Physique des Solides, Université Paris Sud, 91405 Orsay, France
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Abstract
We have performed forced drainage experiments on aqueous foams of bubble diameters D varying from 0.18 to 8 mm, and made with different surfactant and protein solutions (providing different surface viscoelastic properties). Changing bubble size or surface properties allows to evolve between two drainage regimes, the respective dimensionless permeabilities also varying with these parameters. We show that the bubble size and surface properties can be incorporated into a single surface mobility parameter that controls the transition between the two drainage regimes. The permeability measurements indicate how do the hydrodynamic resistances of the foam channels and nodes depend on surface mobility. Taking advantage of the large range of experimental conditions, leading to a variation of the mobility parameter over more than 3 decades, a simple and consistent description of both the drainage regimes and the transition in between them is obtained. For the smallest bubbles (D < 0.5 mm) anomalous behaviors are observed and discussed.
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Affiliation(s)
- A Saint-Jalmes
- Laboratoire de Physique des Solides, Université Paris-Sud, 91405 Orsay, France.
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