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Sharma V, Fessler F, Thalmann F, Marques CM, Stocco A. Rotational and translational drags of a Janus particle close to a wall and a lipid membrane. J Colloid Interface Sci 2023; 652:2159-2166. [PMID: 37713952 DOI: 10.1016/j.jcis.2023.09.026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 04/20/2023] [Revised: 09/01/2023] [Accepted: 09/04/2023] [Indexed: 09/17/2023]
Abstract
HYPOTHESIS Measuring rotational and translational Brownian motion of single spherical particles reveals dissipations due to the interaction between the particle and the environment. EXPERIMENTS In this article, we show experiments where the in-plane translational and the two rotational drag coefficients of a single spherical Brownian particle can be measured. These particle drags are functions of the particle size and of the particle-wall distance, and of the viscous dissipations at play. We measure drag coefficients for Janus particles close to a solid wall and close to a lipid bilayer membrane. FINDINGS For a particle close to a wall, we show that according to hydrodynamic models, particle-wall distance and particle size can be determined. For a particle partially wrapped by lipid membranes, in absence of strong binding interactions, translational and rotational drags are significantly larger than the ones of non-wrapped particles. Beside the effect of the membrane viscosity, we show that dissipations in the deformed membrane cap region strongly contribute to the drag coefficients.
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Affiliation(s)
- Vaibhav Sharma
- Institut Charles Sadron, CNRS UPR22-University of Strasbourg, 23 rue du Loess, Strasbourg 67034, France
| | - Florent Fessler
- Institut Charles Sadron, CNRS UPR22-University of Strasbourg, 23 rue du Loess, Strasbourg 67034, France
| | - Fabrice Thalmann
- Institut Charles Sadron, CNRS UPR22-University of Strasbourg, 23 rue du Loess, Strasbourg 67034, France
| | - Carlos M Marques
- ENS Lyon, CNRS, Université Lyon 1, Laboratoire de Chimie UMR 5182, F-69342 Lyon, France
| | - Antonio Stocco
- Institut Charles Sadron, CNRS UPR22-University of Strasbourg, 23 rue du Loess, Strasbourg 67034, France.
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Fessler F, Sharma V, Muller P, Stocco A. Entry of microparticles into giant lipid vesicles by optical tweezers. Phys Rev E 2023; 107:L052601. [PMID: 37328973 DOI: 10.1103/physreve.107.l052601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2023] [Accepted: 04/20/2023] [Indexed: 06/18/2023]
Abstract
Entry of micro- or nanosized objects into cells or vesicles made of lipid membranes occurs in many processes such as entry of viruses into host cells, microplastics pollution, drug delivery, or biomedical imaging. Here we investigate the microparticle crossing of lipid membranes in giant unilamellar vesicles in the absence of strong binding interactions (e.g., streptavidin-biotin binding). In these conditions, we observe that organic and inorganic particles can always penetrate inside the vesicles provided an external piconewton force is applied and for relatively low membrane tensions. In the limit of vanishing adhesion, we identify the role of the membrane area reservoir and show that a force minimum exists when the particle size is comparable to the bendocapillary length.
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Affiliation(s)
- Florent Fessler
- Institut Charles Sadron, UPR No. 22, CNRS, 23 Rue du Loess, 67200 Strasbourg, France
| | - Vaibhav Sharma
- Institut Charles Sadron, UPR No. 22, CNRS, 23 Rue du Loess, 67200 Strasbourg, France
| | - Pierre Muller
- Institut Charles Sadron, UPR No. 22, CNRS, 23 Rue du Loess, 67200 Strasbourg, France
| | - Antonio Stocco
- Institut Charles Sadron, UPR No. 22, CNRS, 23 Rue du Loess, 67200 Strasbourg, France
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3
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Villa S, Larobina D, Stocco A, Blanc C, Villone MM, D'Avino G, Nobili M. Dynamics of prolate spheroids in the vicinity of an air-water interface. Soft Matter 2023; 19:2646-2653. [PMID: 36967649 DOI: 10.1039/d2sm01665f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
In this article, we present the mobilities of prolate ellipsoidal micrometric particles close to an air-water interface measured by dual wave reflection interference microscopy. Particle's position and orientation with respect to the interface are simultaneously measured as a function of time. From the measured mean square displacement, five particle mobilities (3 translational and 2 rotational) and two translational-rotational cross-correlations are extracted. The fluid dynamics governing equations are solved by the finite element method to numerically evaluate the same mobilities, imposing either slip and no-slip boundary conditions to the flow at the air-water interface. The comparison between experiments and simulations reveals an agreement with no-slip boundary conditions prediction for the translation normal to the interface and the out-of-plane rotation, and with slip ones for parallel translations and in-plane rotation. We rationalize these evidences in the framework of surface incompressibility at the interface.
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Affiliation(s)
- Stefano Villa
- Max Planck Institute for Dynamics and Self-Organization, 37077 Göttingen, Germany.
| | - Domenico Larobina
- Institute of Polymers, Composites, and Biomaterials, National Research Council of Italy, Naples, 80055 Portici, Italy
| | - Antonio Stocco
- Institut Charles Sadron, CNRS UPR22, University of Strasbourg, Strasbourg, France
| | - Christophe Blanc
- Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-Université de Montpellier, Montpellier, France.
| | - Massimiliano M Villone
- Department of Chemical, Materials and Production Engineering, University of Naples Federico II, P.le Tecchio 80, 80125 Naples, Italy
| | - Gaetano D'Avino
- Department of Chemical, Materials and Production Engineering, University of Naples Federico II, P.le Tecchio 80, 80125 Naples, Italy
| | - Maurizio Nobili
- Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-Université de Montpellier, Montpellier, France.
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Villa S, Blanc C, Daddi-Moussa-Ider A, Stocco A, Nobili M. Microparticle Brownian motion near an air-water interface governed by direction-dependent boundary conditions. J Colloid Interface Sci 2023; 629:917-927. [PMID: 36208604 DOI: 10.1016/j.jcis.2022.09.099] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [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: 06/29/2022] [Revised: 09/13/2022] [Accepted: 09/19/2022] [Indexed: 11/26/2022]
Abstract
HYPOTHESIS Although the dynamics of colloids in the vicinity of a solid interface has been widely characterized in the past, experimental studies of Brownian diffusion close to an air-water interface are rare and limited to particle-interface gap distances larger than the particle size. At the still unexplored lower distances, the dynamics is expected to be extremely sensitive to boundary conditions at the air-water interface. There, ad hoc experiments would provide a quantitative validation of predictions. EXPERIMENTS Using a specially designed dual wave interferometric setup, the 3D dynamics of 9 μm diameter particles at a few hundreds of nanometers from an air-water interface is here measured in thermal equilibrium. FINDINGS Intriguingly, while the measured dynamics parallel to the interface approaches expected predictions for slip boundary conditions, the Brownian motion normal to the interface is very close to the predictions for no-slip boundary conditions. These puzzling results are rationalized considering current models of incompressible interfacial flow and deepened developing an ad hoc model which considers the contribution of tiny concentrations of surface active particles at the interface. We argue that such condition governs the particle dynamics in a large spectrum of systems ranging from biofilm formation to flotation process.
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Affiliation(s)
- Stefano Villa
- Max Planck Institute for Dynamics and Self-Organization, Göttingen, Germany
| | - Christophe Blanc
- Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-Université de Montpellier, France
| | | | - Antonio Stocco
- Institut Charles Sadron, CNRS UPR22, University of Strasbourg, France
| | - Maurizio Nobili
- Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-Université de Montpellier, France.
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Poirier A, Banc A, Kapel R, In M, Stocco A, Ramos L. Impact of structural flexibility in the adsorption of wheat and sunflower proteins at an air/water interface. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Abstract
Living or artificial self-propelled colloidal particles show original dynamics when they interact with other objects like passive particles, interfaces or membranes. These active colloids can transport small cargos or can be guided by passive objects, performing simple tasks that could be implemented in more complex systems. Here, we present an experimental investigation at the single particle level of the interaction between isolated active colloids and giant unilamellar lipid vesicles. We observed a persistent orbital motion of the active particle around the vesicle, which is independent of both the particle and the vesicle sizes. Force and torque transfers between the active particle and the vesicle is also described. These results differ in many aspects from recent theoretical and experimental reports on active particles interacting with solid spheres or liquid drops, and may be relevant for the study of swimming particles interacting with cells in biology or with microplastics in environmental science.
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Affiliation(s)
- Vaibhav Sharma
- Institut Charles Sadron, CNRS UPR22-University of Strasbourg, 23 rue du Loess, Strasbourg, 67034, France.
| | - Elise Azar
- Institut Charles Sadron, CNRS UPR22-University of Strasbourg, 23 rue du Loess, Strasbourg, 67034, France.
| | - Andre P Schroder
- Institut Charles Sadron, CNRS UPR22-University of Strasbourg, 23 rue du Loess, Strasbourg, 67034, France.
| | - Carlos M Marques
- Institut Charles Sadron, CNRS UPR22-University of Strasbourg, 23 rue du Loess, Strasbourg, 67034, France.
| | - Antonio Stocco
- Institut Charles Sadron, CNRS UPR22-University of Strasbourg, 23 rue du Loess, Strasbourg, 67034, France.
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Abstract
The adsorption of a sunflower protein extract at two air-water and oil-water interfaces is investigated using tensiometry, dilational viscoelasticity, and ellipsometry. For both interfaces, a three step mechanism was evidenced thanks to master curve representations of the data taken at different aging times and protein concentrations. At short times, a diffusion limited adsorption of proteins at interfaces is demonstrated. First, a two-dimensional protein film is formed with a partition of the polypeptide chains in the two phases that depends strongly on the nature of the hydrophobic phase: most of the film is in the aqueous phase at the air-water interface, while it is mostly in the organic phase at the oil-water interface. Then a three-dimensional saturated monolayer of proteins is formed. At short times, adsorption mechanisms are analogous to those found with typical globular proteins, while strong divergences are observed at longer adsorption times. Following the saturation step, a thick layer expands in the aqueous phase and appears associated with the release of large objects in the bulk. The kinetic evolution of this second layer is compatible with a diffusion limited adsorption of the minor population of polymeric complexes with hydrodynamic radius RH ∼ 80 nm, evidenced in equilibrium with hexameric globulins (RH ∼ 6 nm) in solution. These complexes could result from the presence of residual polyphenols in the extract and raise the question of the role of these compounds in the interfacial properties of plant protein extracts.
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Affiliation(s)
- Alexandre Poirier
- Laboratoire Charles Coulomb (L2C), Univ. Montpellier, CNRS, Montpellier, France
| | - Antonio Stocco
- Laboratoire Charles Coulomb (L2C), Univ. Montpellier, CNRS, Montpellier, France
- Institut Charles Sadron (ICS), CNRS-UPR22, 23 rue du Loess BP 84047, 67034 Cedex 2 Strasbourg, France
| | - Romain Kapel
- Site Plateforme Sciences du Vivant et de la Santé, Laboratoire Réactions et Génie des Procédés (LRGP), 54500 Vandoeuvre-les-Nancy, France
| | - Martin In
- Laboratoire Charles Coulomb (L2C), Univ. Montpellier, CNRS, Montpellier, France
| | - Laurence Ramos
- Laboratoire Charles Coulomb (L2C), Univ. Montpellier, CNRS, Montpellier, France
| | - Amélie Banc
- Laboratoire Charles Coulomb (L2C), Univ. Montpellier, CNRS, Montpellier, France
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8
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Villa S, Boniello G, Stocco A, Nobili M. Motion of micro- and nano- particles interacting with a fluid interface. Adv Colloid Interface Sci 2020; 284:102262. [PMID: 32956958 DOI: 10.1016/j.cis.2020.102262] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Revised: 09/02/2020] [Accepted: 09/02/2020] [Indexed: 11/17/2022]
Abstract
In this article, we review both theoretical models and experimental results on the motion of micro- and nano- particles that are close to a fluid interface or move in between two fluids. Viscous drags together with dissipations due to fluctuations of the fluid interface and its physicochemical properties affect strongly the translational and rotational drags of colloidal particles, which are subjected to Brownian motion in thermal equilibrium. Even if many theoretical and experimental investigations have been carried out, additional scientific efforts in hydrodynamics, statistical physics, wetting and colloid science are still needed to explain unexpected experimental results and to measure particle motion in time and space scales, which are not accessible so far.
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Affiliation(s)
- Stefano Villa
- Dipartimento di Biotecnologie Mediche e Medicina Traslazionale, Università degli Studi di Milano, 20090 Segrate, Italy
| | - Giuseppe Boniello
- Surface du Verre et Interfaces (SVI), UMR 125 CNRS/Saint-Gobain Recherche, 93303 Aubervilliers, France
| | - Antonio Stocco
- Institut Charles Sadron (ICS), CNRS, University of Strasbourg, Strasbourg, France.
| | - Maurizio Nobili
- Laboratoire Charles Coulomb (L2C), CNRS, University of Montpellier, Montpellier, France
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9
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Villa S, Stocco A, Blanc C, Nobili M. Multistable interaction between a spherical Brownian particle and an air-water interface. Soft Matter 2020; 16:960-969. [PMID: 31845955 DOI: 10.1039/c9sm01472a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We report the measurement of the interaction energy between a charged Brownian polystyrene particle and an air-water interface. The interaction potential is obtained from the Boltzmann equation by tracking particle interface distance with a specifically designed Dual-Wave Reflection Interference Microscopy (DW-RIM) setup. The particle has two equilibrium positions located at few hundreds of nanometers from the interface. The farthest position is well accounted by a DLVO model complemented by gravity. The closest one, not predicted by current models, more frequently appears in water solutions at relatively high ions concentrations, when electrostatic interaction is screened out. It is accompanied by a frozen rotational diffusion dynamics that suggests an interacting potential dependent on particle orientation and stresses the decisive role played by particle surface heterogeneities. Building up on both such experimental results, the important role of air nanobubbles pinned on the particle interface is discussed.
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Affiliation(s)
- Stefano Villa
- Laboratoire Charles Coulomb (L2C), University of Montpellier, CNRS, Montpellier, France.
| | - Antonio Stocco
- Institut Charles Sadron (ICS), University of Strasbourg, CNRS, Strasbourg, France
| | - Christophe Blanc
- Laboratoire Charles Coulomb (L2C), University of Montpellier, CNRS, Montpellier, France.
| | - Maurizio Nobili
- Laboratoire Charles Coulomb (L2C), University of Montpellier, CNRS, Montpellier, France.
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10
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Renard C, Leclercq L, Stocco A, Cottet H. Superhydrophobic capillary coatings: Elaboration, characterization and application to electrophoretic separations. J Chromatogr A 2019; 1603:361-370. [DOI: 10.1016/j.chroma.2019.06.035] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2019] [Revised: 06/10/2019] [Accepted: 06/12/2019] [Indexed: 11/25/2022]
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11
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Stocco A, Chollet B, Wang X, Blanc C, Nobili M. Rotational diffusion of partially wetted colloids at fluid interfaces. J Colloid Interface Sci 2019; 542:363-369. [PMID: 30769259 DOI: 10.1016/j.jcis.2019.02.017] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2018] [Revised: 02/04/2019] [Accepted: 02/05/2019] [Indexed: 01/16/2023]
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12
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Affiliation(s)
- Xibo Yan
- Université Lyon, INSA, CNRS, Ingénierie des Matériaux Polymères , F-69003 Lyon , France
| | - Antonio Stocco
- Université Strasbourg, CNRS, Institut Charles Sadron , F-67000 Strasbourg , France
| | - Julien Bernard
- Université Lyon, INSA, CNRS, Ingénierie des Matériaux Polymères , F-69003 Lyon , France
| | - François Ganachaud
- Université Lyon, INSA, CNRS, Ingénierie des Matériaux Polymères , F-69003 Lyon , France
- University of Pennsylvania, CNRS, Solvay, Complex Assemblies Soft Matter Lab , 350 Patterson Boulevard , Bristol , Pennsylvania 19007 , United States
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13
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Poirier A, Banc A, Stocco A, In M, Ramos L. Multistep building of a soft plant protein film at the air-water interface. J Colloid Interface Sci 2018; 526:337-346. [DOI: 10.1016/j.jcis.2018.04.087] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Revised: 04/22/2018] [Accepted: 04/23/2018] [Indexed: 01/24/2023]
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14
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Striolo A, Kim J, Liz-Marzán L, Tadiello L, Pauly M, Murphy C, Roig A, Gracias D, Xia Y, Reguera J, Mueller A, Critchley K, Brust M, Scarabelli L, Mayer M, Thiele M, Buzza M, Deák A, Bago Rodriguez AM, Kuttner C, Wolf H, Kay E, Stocco A, Portehault D, Mattoussi H, Heatley K, Kumacheva E, González G, Hanske C, Tong W, Tahir MN, Abécassis B, Granick S, Duguet E, Synytska A, Velikov K. Janus and patchy nanoparticles: general discussion. Faraday Discuss 2018; 191:117-139. [PMID: 27711897 DOI: 10.1039/c6fd90048h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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15
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Marina PF, Cheng C, Sedev R, Stocco A, Binks BP, Wang D. Van der Waals Emulsions: Emulsions Stabilized by Surface-Inactive, Hydrophilic Particles via van der Waals Attraction. Angew Chem Int Ed Engl 2018; 57:9510-9514. [DOI: 10.1002/anie.201805410] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Indexed: 11/10/2022]
Affiliation(s)
- Paula Facal Marina
- Future Industries Institute; University of South Australia; Mawson Lakes SA 5095 Australia
| | - Chongling Cheng
- State Key Laboratory for Inorganic Synthesis and Preparative Chemistry; College of Chemistry; Jilin University; Changchun 130012 China
| | - Rossen Sedev
- Future Industries Institute; University of South Australia; Mawson Lakes SA 5095 Australia
| | - Antonio Stocco
- Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-; University of Montpellier; 34095 Montpellier France
| | - Bernard P. Binks
- School of Mathematics and Physical Sciences; University of Hull; Hull HU6 7RX UK
| | - Dayang Wang
- State Key Laboratory for Inorganic Synthesis and Preparative Chemistry; College of Chemistry; Jilin University; Changchun 130012 China
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16
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Marina PF, Cheng C, Sedev R, Stocco A, Binks BP, Wang D. Van der Waals Emulsions: Emulsions Stabilized by Surface-Inactive, Hydrophilic Particles via van der Waals Attraction. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201805410] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Paula Facal Marina
- Future Industries Institute; University of South Australia; Mawson Lakes SA 5095 Australia
| | - Chongling Cheng
- State Key Laboratory for Inorganic Synthesis and Preparative Chemistry; College of Chemistry; Jilin University; Changchun 130012 China
| | - Rossen Sedev
- Future Industries Institute; University of South Australia; Mawson Lakes SA 5095 Australia
| | - Antonio Stocco
- Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-; University of Montpellier; 34095 Montpellier France
| | - Bernard P. Binks
- School of Mathematics and Physical Sciences; University of Hull; Hull HU6 7RX UK
| | - Dayang Wang
- State Key Laboratory for Inorganic Synthesis and Preparative Chemistry; College of Chemistry; Jilin University; Changchun 130012 China
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17
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Yan X, Delgado M, Aubry J, Gribelin O, Stocco A, Boisson-Da Cruz F, Bernard J, Ganachaud F. Central Role of Bicarbonate Anions in Charging Water/Hydrophobic Interfaces. J Phys Chem Lett 2018; 9:96-103. [PMID: 29239612 DOI: 10.1021/acs.jpclett.7b02993] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Aqueous interfaces are ubiquitous in Nature and play a fundamental role in environmental or biological processes or modern nanotechnologies. These interfaces are negatively charged, and despite several decades of research, the rationale behind this phenomenon is still under debate. Two main controversial schools of thought argue on this issue; the first relies on the adsorption of hydroxide anions on hydrophobic surfaces, whereas the second one supports a self-rearrangement of water molecules at the interface bearing hydronium ions. Here, we report on two series of independent experimental studies (nanoprecipitation and interfacial tension measurements) that demonstrate that in the pH 5-10 range the negative interfacial charge of the colloids mostly stems from bicarbonate ions, whereas at lower and higher pH, protons and hydroxide ions contribute, with bicarbonate ions, to the interfacial charging. This new interpretation complies with previous studies and opens new perspectives to this striking physical chemical issue.
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Affiliation(s)
- Xibo Yan
- Université de Lyon, INSA Lyon, CNRS UMR 5223, Ingénierie des Matériaux Polymères , F-69621 Villeurbanne, France
| | - Marco Delgado
- Université de Lyon, INSA Lyon, CNRS UMR 5223, Ingénierie des Matériaux Polymères , F-69621 Villeurbanne, France
- Institut Charles Gerhardt Montpellier UMR 5253 - CNRS, Université Montpellier, ENSCM , 8 rue de l'Ecole Normale, 34296 Montpellier, France
| | - Julien Aubry
- Institut Charles Gerhardt Montpellier UMR 5253 - CNRS, Université Montpellier, ENSCM , 8 rue de l'Ecole Normale, 34296 Montpellier, France
| | - Olivier Gribelin
- Université de Lyon, INSA Lyon, CNRS UMR 5223, Ingénierie des Matériaux Polymères , F-69621 Villeurbanne, France
| | - Antonio Stocco
- Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-Université Montpellier , Montpellier F-34095, France
| | - Fernande Boisson-Da Cruz
- Université de Lyon, INSA Lyon, CNRS UMR 5223, Ingénierie des Matériaux Polymères , F-69621 Villeurbanne, France
| | - Julien Bernard
- Université de Lyon, INSA Lyon, CNRS UMR 5223, Ingénierie des Matériaux Polymères , F-69621 Villeurbanne, France
| | - François Ganachaud
- Université de Lyon, INSA Lyon, CNRS UMR 5223, Ingénierie des Matériaux Polymères , F-69621 Villeurbanne, France
- Institut Charles Gerhardt Montpellier UMR 5253 - CNRS, Université Montpellier, ENSCM , 8 rue de l'Ecole Normale, 34296 Montpellier, France
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18
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Abstract
Biological or artificial microswimmers move performing trajectories of different kinds such as rectilinear, circular, or spiral ones. Here, we report on circular trajectories observed for active Janus colloids trapped at the air-water interface. Circular motion is due to asymmetric and nonuniform surface properties of the particles caused by fabrication. Motion persistence is enhanced by the partial wetted state of the Janus particles actively moving in two dimensions at the air-water interface. The slowing down of in-plane and out-of-plane rotational diffusions is described and discussed.
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Affiliation(s)
- Xiaolu Wang
- Laboratoire Charles Coulomb (L2C), Université de Montpellier, CNRS , 34095 Montpellier, France
| | - Martin In
- Laboratoire Charles Coulomb (L2C), Université de Montpellier, CNRS , 34095 Montpellier, France
| | - Christophe Blanc
- Laboratoire Charles Coulomb (L2C), Université de Montpellier, CNRS , 34095 Montpellier, France
| | - Alois Würger
- Laboratoire Ondes et Matière d'Aquitaine, Université de Bordeaux, CNRS , 33405 Talence, France
| | - Maurizio Nobili
- Laboratoire Charles Coulomb (L2C), Université de Montpellier, CNRS , 34095 Montpellier, France
| | - Antonio Stocco
- Laboratoire Charles Coulomb (L2C), Université de Montpellier, CNRS , 34095 Montpellier, France
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19
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Bhandary R, Alauzun JG, Hesemann P, Stocco A, In M, Mutin PH. Phase transfer of TiO 2 nanoparticles from water to ionic liquid triggered by phosphonic acid grafting. Soft Matter 2017; 13:8023-8026. [PMID: 29057996 DOI: 10.1039/c7sm01424d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Controlling the interface between TiO2 nanocrystals and ionic liquids is of high fundamental and applied interest for energy storage and conversion devices. Phase transfer of nanoparticles from a synthesis medium to a processing or an application medium plays a significant role in nanotechnology. Here we demonstrate that surface modification with phosphonic acids bearing cationic end-groups can trigger the phase transfer of TiO2 nanoparticles from an aqueous sol to a typical water-immiscible ionic liquid, [Emim][NTf2]. The transfer involves both the grafting of the phosphonic acid moiety and the exchange of the counter ion of the cationic end-group by NTf2 anions, as demonstrated by solid-state NMR, elemental analysis and independent grafting and ion exchange experiments. Furthermore, the colloidal stability of the TiO2 sols in [Emim][NTf2] strongly depends on the hydrophobic character of the cationic end-groups.
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Affiliation(s)
- R Bhandary
- Institut Charles Gerhardt Montpellier, UMR 5253, Université de Montpellier, CNRS, ENSCM, Montpellier, France.
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Stocco A, Nobili M. A comparison between liquid drops and solid particles in partial wetting. Adv Colloid Interface Sci 2017; 247:223-233. [PMID: 28728667 DOI: 10.1016/j.cis.2017.06.014] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2017] [Revised: 05/19/2017] [Accepted: 06/30/2017] [Indexed: 01/06/2023]
Abstract
In this critical review we compare two geometries in partial wetting: a liquid drop on a planar substrate and a spherical particle at a planar liquid interface. We show that this comparison is far from being trivial even if the same physical interactions are at play in both geometries. Similarities and differences in terms of free energies and frictions will be discussed. Contact angle hysteresis, the impact of surface roughness and line pinning on wetting will be described and compared to selected experimental findings.
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21
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Boniello G, Stocco A, Blanc C, Nobili M. Comment on "Brownian diffusion of a particle at an air/liquid interface: elastic (not viscous) response of the surface". Phys Chem Chem Phys 2017; 19:22592-22593. [PMID: 28799596 DOI: 10.1039/c7cp02970e] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
In a recent article Toro-Mendoza et al. considered an elastic response of an interface in order to explain the enhanced lateral drag of solid particles straddling fluid interfaces we recently measured.
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Affiliation(s)
- G Boniello
- Ecole Normale Supérieure-PSL Research University, Dpt Chimie, Sorbonne Universités - UPMC Univ. Paris 06, CNRS UMR 8640, 24 rue Lhomond, 75005 Paris, France
| | - A Stocco
- Laboratoire Charles Coulomb - Université Montpellier/CNRS UMR 5221, Pl. E. Bataillon, 3409 Montpellier, France.
| | - C Blanc
- Laboratoire Charles Coulomb - Université Montpellier/CNRS UMR 5221, Pl. E. Bataillon, 3409 Montpellier, France.
| | - M Nobili
- Laboratoire Charles Coulomb - Université Montpellier/CNRS UMR 5221, Pl. E. Bataillon, 3409 Montpellier, France.
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22
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Boubekri R, Gross M, In M, Diat O, Nobili M, Möhwald H, Stocco A. MHz Ultrasound Induced Roughness of Fluid Interfaces. Langmuir 2016; 32:10177-10183. [PMID: 27635785 DOI: 10.1021/acs.langmuir.6b02167] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The interface between two fluids is never flat at the nanoscale, and this is important for transport across interfaces. In the absence of any external field, the surface roughness is due to thermally excited capillary waves possessing subnanometric amplitudes in the case of simple liquids. Here, we investigate the effect of ultrasound on the surface roughness of liquid-gas and liquid-liquid interfaces. Megahertz (MHz) frequency ultrasound was applied normal to the interface at relatively low ultrasonic pressures (<0.6 MPa), and the amplitudes of surface fluctuations have been measured by light reflectivity and ellipsometry. We found a dramatic enhancement of surface roughness, roughly linear with intensity, with vertical displacements of the interface as high as 50-100 nm. As a consequence, the effective contact area between two fluids can be increased by ultrasound. This result has a clear impact for enhancing interface based processes such as mass or heat transfer.
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Affiliation(s)
- Rym Boubekri
- Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-Univ. Montpellier, Montpellier F-34095, France
- Institut de Chimie Séparative de Marcoule, UMR 5257 (CEA, CNRS, UM, ENSCM), BP 17171, 30207 Cedex Bagnols-sur-Cèze, France
| | - Michel Gross
- Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-Univ. Montpellier, Montpellier F-34095, France
| | - Martin In
- Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-Univ. Montpellier, Montpellier F-34095, France
| | - Olivier Diat
- Institut de Chimie Séparative de Marcoule, UMR 5257 (CEA, CNRS, UM, ENSCM), BP 17171, 30207 Cedex Bagnols-sur-Cèze, France
| | - Maurizio Nobili
- Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-Univ. Montpellier, Montpellier F-34095, France
| | - Helmuth Möhwald
- Max-Planck-Institute of Colloids and Interfaces , Am Mühlenberg, 14476 Potsdam, Germany
| | - Antonio Stocco
- Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-Univ. Montpellier, Montpellier F-34095, France
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Boniello G, Stocco A, Gross M, In M, Blanc C, Nobili M. Translational viscous drags of an ellipsoid straddling an interface between two fluids. Phys Rev E 2016; 94:012602. [PMID: 27575174 DOI: 10.1103/physreve.94.012602] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2016] [Indexed: 11/07/2022]
Abstract
We study the dynamics of individual polystyrene ellipsoids of different aspect ratios trapped at the air-water interface. Using particle tracking and in situ vertical scanning interferometry techniques we are able to measure translational drags and the protrusion in air of the ellipsoids. We report that translational drags on the ellipsoid are unexpectedly enhanced: despite the fact that a noticeable part of the ellipsoid is in air, drags are found larger than the bulk one in water.
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Affiliation(s)
- Giuseppe Boniello
- Laboratoire Charles Coulomb (L2C), UMR 5221 Centre National de la Recherche Scientifique, Université de Montpellier, Montpellier, France
| | - Antonio Stocco
- Laboratoire Charles Coulomb (L2C), UMR 5221 Centre National de la Recherche Scientifique, Université de Montpellier, Montpellier, France
| | - Michel Gross
- Laboratoire Charles Coulomb (L2C), UMR 5221 Centre National de la Recherche Scientifique, Université de Montpellier, Montpellier, France
| | - Martin In
- Laboratoire Charles Coulomb (L2C), UMR 5221 Centre National de la Recherche Scientifique, Université de Montpellier, Montpellier, France
| | - Christophe Blanc
- Laboratoire Charles Coulomb (L2C), UMR 5221 Centre National de la Recherche Scientifique, Université de Montpellier, Montpellier, France
| | - Maurizio Nobili
- Laboratoire Charles Coulomb (L2C), UMR 5221 Centre National de la Recherche Scientifique, Université de Montpellier, Montpellier, France
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Avendano C, Brun N, Fontaine O, In M, Mehdi A, Stocco A, Vioux A. Multiwalled Carbon Nanotube/Cellulose Composite: From Aqueous Dispersions to Pickering Emulsions. Langmuir 2016; 32:3907-3916. [PMID: 27052957 DOI: 10.1021/acs.langmuir.6b00380] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A mild and simple way to prepare stable aqueous colloidal suspensions of composite particles made of a cellulosic material (Sigmacell cellulose) and multiwalled carbon nanotubes (MWCNTs) is reported. These suspensions can be dried and redispersed in water at pH 10.5. Starting with rather crude initial materials, commercial Sigmacell cellulose and MWCNTs, a significant fraction of composite dispersed in water could be obtained. The solid composites and their colloidal suspensions were characterized by electronic microscopy, thermal analyses, FTIR and Raman spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and light scattering. The composite particles consist of tenuous aggregates of CNTs and cellulose, several hundred nanometers large, and are composed of 55 wt % cellulose and 45 wt % CNTs. Such particles were shown to stabilize cyclohexane-in-water emulsions. The adsorption and the elasticity of the layer they form at interface were characterized by the pendant drop method. The stability of the oil-in-water emulsions was attributed to the formation of an elastic network of composite particles at interface. Cyclohexane droplet diameters could be tuned from 20 to 100 μm by adjusting the concentration of composite particles. This behavior was attributed to the limited coalescence phenomenon, just as expected for Pickering emulsions. Interestingly, cyclohexane droplets were stable over time and sustained pH modifications over a wide range, although acidic pH induced accelerated creaming. This study points out the possibility of combining crude cellulose and MWCNTs through a simple process to obtain colloidal systems of interest for the design of functional conductive materials.
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Affiliation(s)
- Carlos Avendano
- Institut Charles Gerhardt de Montpellier, UMR 5253, CNRS-ENSCM-UM, Université de Montpellier, CC 1701, Place Eugène Bataillon, 34095 Montpellier, France
| | - Nicolas Brun
- Institut Charles Gerhardt de Montpellier, UMR 5253, CNRS-ENSCM-UM, Université de Montpellier, CC 1701, Place Eugène Bataillon, 34095 Montpellier, France
| | - Olivier Fontaine
- Institut Charles Gerhardt de Montpellier, UMR 5253, CNRS-ENSCM-UM, Université de Montpellier, CC 1701, Place Eugène Bataillon, 34095 Montpellier, France
| | - Martin In
- Laboratoire Charles Coulomb, UMR 5221, CNRS-UM, Université de Montpellier, CC069, Place Eugène Bataillon, 34095 Montpellier, France
| | - Ahmad Mehdi
- Institut Charles Gerhardt de Montpellier, UMR 5253, CNRS-ENSCM-UM, Université de Montpellier, CC 1701, Place Eugène Bataillon, 34095 Montpellier, France
| | - Antonio Stocco
- Laboratoire Charles Coulomb, UMR 5221, CNRS-UM, Université de Montpellier, CC069, Place Eugène Bataillon, 34095 Montpellier, France
| | - André Vioux
- Institut Charles Gerhardt de Montpellier, UMR 5253, CNRS-ENSCM-UM, Université de Montpellier, CC 1701, Place Eugène Bataillon, 34095 Montpellier, France
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Wang X, In M, Blanc C, Malgaretti P, Nobili M, Stocco A. Wetting and orientation of catalytic Janus colloids at the surface of water. Faraday Discuss 2016; 191:305-324. [DOI: 10.1039/c6fd00025h] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [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
Janus colloidal particles show remarkable properties in terms of surface activity, self-assembly and wetting. Moreover they can perform autonomous motion if they can chemically react with the liquid in which they are immersed. In order to understand the self-propelled motion of catalytic Janus colloids at the air–water interface, wetting and the orientation of the catalytic surface are important properties to be investigated. Wetting plays a central role in active motion since it determines the contact between the fuel and the catalytic surface as well as the efficiency of the transduction of the chemical reaction into motion. Active motion is not expected to occur either when the catalytic face is completely out of the aqueous phase or when the Janus boundaries are parallel to the interfacial plane. The design of a Janus colloid possessing two hydrophilic faces is required to allow the catalytic face to react with the fuel (e.g. H2O2 for platinum) in water and to permit some rotational freedom of the Janus colloid in order to generate propulsion parallel to the interfacial plane. Here, we discuss some theoretical aspects that should be accounted for when studying Janus colloids at the surface of water. The free energy of ideal Janus colloidal particles at the interface is modeled as a function of the immersion depth and the particle orientation. Analytical expressions of the energy profiles are established. Energetic aspects are then discussed in relation to the particle’s ability to rotate at the interface. By introducing contact angle hysteresis we describe how the effects of contact line pinning modifies the scenario described in the ideal case. Experimental observations of the contact angle hysteresis of Janus colloids at the interface reveal the effect of pinning; and orientations of silica particles half covered with a platinum layer at the interface do not comply with the ideal scenarios. Experimental observations suggest that Janus colloids at the fluid interface behave as a kinetically driven system, where the contact line motion over the defects decorating the Janus faces rules the orientation and rotational diffusion of the particle.
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Affiliation(s)
- Xiaolu Wang
- Laboratoire Charles Coulomb (L2C)
- UMR 5221 CNRS-Univ. Montpellier
- Montpellier F-34095
- France
| | - Martin In
- Laboratoire Charles Coulomb (L2C)
- UMR 5221 CNRS-Univ. Montpellier
- Montpellier F-34095
- France
| | - Christophe Blanc
- Laboratoire Charles Coulomb (L2C)
- UMR 5221 CNRS-Univ. Montpellier
- Montpellier F-34095
- France
| | - Paolo Malgaretti
- Max Planck Institüt für Intelligente Systeme
- D-70569 Stuttgart
- Germany
- IV Institüt für Theoretische Physik
- Universität Stuttgart
| | - Maurizio Nobili
- Laboratoire Charles Coulomb (L2C)
- UMR 5221 CNRS-Univ. Montpellier
- Montpellier F-34095
- France
| | - Antonio Stocco
- Laboratoire Charles Coulomb (L2C)
- UMR 5221 CNRS-Univ. Montpellier
- Montpellier F-34095
- France
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26
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Avendano C, Brun N, Mourad E, Fontaine O, Sarroste CL, Baccour M, In M, Mehdi A, Stocco A, Vioux A. Nanocomposites with both structural and porous hierarchy synthesized from Pickering emulsions. NEW J CHEM 2016. [DOI: 10.1039/c5nj03248b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [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]
Abstract
Templating polycondensation of furfural and phloroglucinol by O/W emulsions stabilized by CNT-carboxymethylcellulose composite particles allowed preparing conductive and magnetic microcapsules.
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Affiliation(s)
- Carlos Avendano
- Institut Charles Gerhardt de Montpellier
- UMR 5253
- CNRS-ENSCM-UM
- Université de Montpellier
- 34095 Montpellier
| | - Nicolas Brun
- Institut Charles Gerhardt de Montpellier
- UMR 5253
- CNRS-ENSCM-UM
- Université de Montpellier
- 34095 Montpellier
| | - Eléonore Mourad
- Institut Charles Gerhardt de Montpellier
- UMR 5253
- CNRS-ENSCM-UM
- Université de Montpellier
- 34095 Montpellier
| | - Olivier Fontaine
- Institut Charles Gerhardt de Montpellier
- UMR 5253
- CNRS-ENSCM-UM
- Université de Montpellier
- 34095 Montpellier
| | | | - Mohamed Baccour
- Institut Charles Gerhardt de Montpellier
- UMR 5253
- CNRS-ENSCM-UM
- Université de Montpellier
- 34095 Montpellier
| | - Martin In
- Laboratoire Charles Coulomb
- UMR 5221
- CNRS-UM
- Université de Montpellier
- 34095 Montpellier
| | - Ahmad Mehdi
- Institut Charles Gerhardt de Montpellier
- UMR 5253
- CNRS-ENSCM-UM
- Université de Montpellier
- 34095 Montpellier
| | - Antonio Stocco
- Laboratoire Charles Coulomb
- UMR 5221
- CNRS-UM
- Université de Montpellier
- 34095 Montpellier
| | - André Vioux
- Institut Charles Gerhardt de Montpellier
- UMR 5253
- CNRS-ENSCM-UM
- Université de Montpellier
- 34095 Montpellier
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Striolo A, Kim J, Murphy C, Liz-Marzán L, Lahann J, Reguera J, Zhou Y, Brust M, Thill A, Scarabelli L, König TAF, Buzza M, Kuttner C, Gonzalez Solveyra E, Wolf H, Vermant J, Pauly M, Harvie A, Pasquato L, Stocco A, Mattoussi H, Kumacheva E, Heatley K, Hanske C, Faller R, French D, Honciuc A, Binks B, Sicard F. Particles at interfaces: general discussion. Faraday Discuss 2016; 191:407-434. [DOI: 10.1039/c6fd90050j] [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: 11/21/2022]
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Abstract
For a droplet or a bubble of dimensions below 100 nm, long-range surface forces such as long-range van der Waals forces can compete with capillarity, which leads to a size dependence of the contact angle. This is discussed in this work, where we also show that the effect cannot simply be described by a normalized line tension. We calculate interfacial profiles for typical values of van der Waals forces and discuss the role of long-range surface forces on the contact angle of nanobubbles and nanodrops.
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Affiliation(s)
- Antonio Stocco
- Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-University of Montpellier , Montpellier F-34095, France
- DWI - Leibniz-Institut für Interaktive Materialien , Aachen 52056, Germany
| | - Helmuth Möhwald
- Max Planck Institute of Colloids and Interfaces , Potsdam 14476, Germany
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Abstract
We have investigated the active motion of self-propelled colloids confined at the air-water interface and explored the possibility of enhancing the directional motion of self-propelled Janus colloids by slowing down their rotational diffusion. The two dimensional motion of micron-sized silica-platinum Janus colloids has been experimentally measured by particle tracking video-microscopy at increasing concentrations of the catalytic fuel, i.e. H2O2. Compared to the motion in the bulk, a dramatic enhancement of both the persistence length of trajectories and the speed has been observed. The interplay of colloid self-propulsion, due to an asymmetric catalytic reaction occurring on the colloid, surface properties and interfacial frictions controls the enhancement of the directional movement. The slowing down of the rotational diffusion at the interface, also measured experimentally, plays a pivotal role in the control and enhancement of active motion.
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Affiliation(s)
- Xiaolu Wang
- Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-University of Montpellier, Montpellier F-34095, France.
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Boniello G, Blanc C, Fedorenko D, Medfai M, Mbarek NB, In M, Gross M, Stocco A, Nobili M. Brownian diffusion of a partially wetted colloid. Nat Mater 2015; 14:908-11. [PMID: 26147846 DOI: 10.1038/nmat4348] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2014] [Accepted: 06/03/2015] [Indexed: 05/21/2023]
Abstract
The dynamics of colloidal particles at interfaces between two fluids plays a central role in microrheology, encapsulation, emulsification, biofilm formation, water remediation and the interface-driven assembly of materials. Common intuition corroborated by hydrodynamic theories suggests that such dynamics is governed by a viscous force lower than that observed in the more viscous fluid. Here, we show experimentally that a particle straddling an air/water interface feels a large viscous drag that is unexpectedly larger than that measured in the bulk. We suggest that such a result arises from thermally activated fluctuations of the interface at the solid/air/liquid triple line and their coupling to the particle drag through the fluctuation-dissipation theorem. Our findings should inform approaches for improved control of the kinetically driven assembly of anisotropic particles with a large triple-line-length/particle-size ratio, and help to understand the formation and structure of such arrested materials.
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Affiliation(s)
- Giuseppe Boniello
- Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-Université de Montpellier, 34000 Montpellier, France
| | - Christophe Blanc
- Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-Université de Montpellier, 34000 Montpellier, France
| | - Denys Fedorenko
- Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-Université de Montpellier, 34000 Montpellier, France
| | - Mayssa Medfai
- Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-Université de Montpellier, 34000 Montpellier, France
| | - Nadia Ben Mbarek
- Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-Université de Montpellier, 34000 Montpellier, France
| | - Martin In
- Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-Université de Montpellier, 34000 Montpellier, France
| | - Michel Gross
- Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-Université de Montpellier, 34000 Montpellier, France
| | - Antonio Stocco
- Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-Université de Montpellier, 34000 Montpellier, France
| | - Maurizio Nobili
- Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-Université de Montpellier, 34000 Montpellier, France
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Stocco A, Su G, Nobili M, In M, Wang D. In situ assessment of the contact angles of nanoparticles adsorbed at fluid interfaces by multiple angle of incidence ellipsometry. Soft Matter 2014; 10:6999-7007. [PMID: 24910076 DOI: 10.1039/c4sm00482e] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Here multiple angle of incidence ellipsometry was successfully applied to in situ assess the contact angle and surface coverage of gold nanoparticles as small as 18 nm, coated with stimuli-responsive polymers, at water-oil and water-air interfaces in the presence of NaCl and NaOH, respectively. The interfacial adsorption of the nanoparticles was found to be very slow and took days to reach a fairly low surface coverage. For water-oil interfaces, in situ nanoparticle contact angles agree with the macroscopic equilibrium contact angles of planar gold surfaces with the same polymer coatings, whilst for water-air interfaces, significant differences have been observed.
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Affiliation(s)
- Antonio Stocco
- Université Montpellier 2, Laboratoire Charles Coulomb UMR 5221, F-34095, Montpellier, France.
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Stocco A, Chanana M, Su G, Cernoch P, Binks BP, Wang D. Bidirectional Nanoparticle Crossing of Oil-Water Interfaces Induced by Different Stimuli: Insight into Phase Transfer. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201203493] [Citation(s) in RCA: 8] [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: 11/10/2022]
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Stocco A, Chanana M, Su G, Cernoch P, Binks BP, Wang D. Bidirectional Nanoparticle Crossing of Oil-Water Interfaces Induced by Different Stimuli: Insight into Phase Transfer. Angew Chem Int Ed Engl 2012; 51:9647-51. [DOI: 10.1002/anie.201203493] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2012] [Revised: 07/12/2012] [Indexed: 11/10/2022]
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Ramírez P, Stocco A, Muñoz J, Miller R. Interfacial rheology and conformations of triblock copolymers adsorbed onto the water-oil interface. J Colloid Interface Sci 2012; 378:135-43. [PMID: 22575779 DOI: 10.1016/j.jcis.2012.04.033] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2012] [Revised: 04/11/2012] [Accepted: 04/12/2012] [Indexed: 01/03/2023]
Abstract
The conformation and the dilatational properties of three non-ionic triblock PEO-PPO-PEO (where PEO is polyethyleneoxide and PPO is polypropyleneoxide) copolymers of different hydrophobicity and molecular weight were investigated at the water-hexane interface. The interfacial behavior of the copolymers was studied by combining dilatational rheology using the oscillating drop method and ellipsometry. From the dilatational rheology measurements the limiting elasticity values, E(0), of the Pluronics as function of surface pressure, Π, and adsorption time were obtained, i.e. E(0)(t) and E(0)(Π). Here, it is shown that E(0)(t) depends on the number of PEO units and on the bulk concentration, showing maximum and minimum surface elasticity values which indicate conformational changes in the interfacial layer. Furthermore, in the framework of the polymer scaling law theory, conformational transitions were discussed in E(0) vs. Π plots. In a dilute regime (Π<14 mN m(-1)) at the water-hexane interface, E(0)=2Π fits well all the data, which indicates a two-dimensional "stretched chain" conformation. Increasing Π, two other interfacial transitions could take place. The different behavior of Pluronic copolymers could be also described by the local minima of E(0), which depends on the hydrophobicity of the copolymers. Conformational transitions observed by interfacial rheology were compared to ellipsometric data. Experimental results were discussed and explained on the basis of two- and three-dimensional copolymer structure taking into account that PPO chains could be partially immersed in hexane and water.
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Affiliation(s)
- Pablo Ramírez
- Departamento de Ingeniería Química, Facultad de Química, Universidad de Sevilla, Sevilla, Spain.
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35
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Sharipova A, Aidarova S, Fainerman V, Stocco A, Cernoch P, Miller R. Dynamics of adsorption of polyallylamine hydrochloride/sodium dodecyl sulphate at water/air and water/hexane interfaces. Colloids Surf A Physicochem Eng Asp 2011. [DOI: 10.1016/j.colsurfa.2011.02.052] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [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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36
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Stocco A, Mokhtari T, Haseloff G, Erbe A, Sigel R. Evanescent-wave dynamic light scattering at an oil-water interface: diffusion of interface-adsorbed colloids. Phys Rev E Stat Nonlin Soft Matter Phys 2011; 83:011601. [PMID: 21405697 DOI: 10.1103/physreve.83.011601] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2009] [Revised: 08/30/2010] [Indexed: 05/21/2023]
Abstract
A light-scattering goniometer for evanescent-wave dynamic light scattering (EWDLS) measurements at a liquid-fluid interface is introduced, and used for measurements on two charge-stabilized polystyrene colloid systems adsorbed to alkane-water interfaces. The goniometer allows an independent variation of the penetration depth and the scattering vector components parallel and perpendicular to a liquid-fluid interface. The possible illumination geometries are compared. Ellipsometry at the liquid-fluid interface is implemented as a complementary tool. In EWDLS measurements, the absence of diffusive motion perpendicular to the interface is demonstrated, which confirms the adsorption of the particles. The two-step decay of the autocorrelation function is interpreted in terms of diffusion within a two-dimensional interface lattice of colloidal particles, stabilized by repulsive electrostatic interactions, and a desorption process. A significant slowing down of the in-plane diffusion of the colloids as compared to the bulk diffusion is observed.
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Affiliation(s)
- Antonio Stocco
- Max Planck Institute of Colloids and Interfaces, Golm, Germany
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Stocco A, Crassous J, Salonen A, Saint-Jalmes A, Langevin D. Two-mode dynamics in dispersed systems: the case of particle-stabilized foams studied by diffusing wave spectroscopy. Phys Chem Chem Phys 2011; 13:3064-72. [DOI: 10.1039/c0cp01152e] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Stocco A, Tauer K, Pispas S, Sigel R. Dynamics of amphiphilic diblock copolymers at the air-water interface. J Colloid Interface Sci 2010; 355:172-8. [PMID: 21194709 DOI: 10.1016/j.jcis.2010.11.049] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2010] [Revised: 11/17/2010] [Accepted: 11/17/2010] [Indexed: 11/30/2022]
Abstract
Two polyisoprene-polyethyleneoxide diblock copolymers with different block length ratios adsorbed to the water surface were investigated by multiple angle of incidence ellipsometry, evanescent wave light scattering, and surface tension experiments. In a semidilute interfacial regime, the transition from a two-dimensional to a "mushroom" regime, in which polymer chains form loops and tails in the subphase, was discussed. A diffusion mechanism parallel to the interface was probed by evanescent wave dynamic light scattering. At intermediate concentrations, the interfacial diffusion coefficient D(∥) scales with the surface concentration Γ, as D(∥) ~ Γ(0.77) in agreement with the scaling observed for polymer solutions in a semidilute regime. At relatively high concentrations a decreasing of D(∥) is discussed in terms of increasing friction due to interactions between polyisoprene chains.
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Affiliation(s)
- Antonio Stocco
- Max Planck Institute of Colloids and Interfaces, 14476 Potsdam-Golm, Germany.
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Abstract
We report a dramatic increase in foam stability for catanionic mixtures (myristic acid and cetyl trimethylammonium bromide, CTABr) with respect to that of CTABr solutions. This increase was related to the low surface tension, high surface concentration, and high viscoelastic compression moduli, as measured with rising bubble experiments and ellipsometry. Dialysis of the catanionic mixtures has been used to decrease the concentration of free surfactant ions (CTA(+)). The equilibrium surface tension is reached faster for nondialyzed samples because of the presence of these free ions. As a consequence, the foamability of the dialyzed solutions is lower. Foam coarsening has been studied using multiple light scattering: it is similar for dialyzed and nondialyzed samples and much slower than for pure CTABr foams.
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Affiliation(s)
- Antonio Stocco
- Laboratoire de Physique des Solides, Université Paris-Sud, UMR CNRS 8502, 91405 Orsay Cedex, France
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Stocco A, Tauer K. High-resolution ellipsometric studies on fluid interfaces. Eur Phys J E Soft Matter 2009; 30:431-438. [PMID: 20012666 DOI: 10.1140/epje/i2009-10544-1] [Citation(s) in RCA: 7] [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: 08/13/2009] [Accepted: 11/13/2009] [Indexed: 05/28/2023]
Abstract
In this article, highly accurate experimental results reveal the interfacial profile between different macroscopic fluid phases. The deviation from a step profile, quantified by the ellipsometric quantity J(1), shows a strong correlation with the cohesive energy quantified by the Gordon parameter G . Surprisingly, at high values of G , J (1)( < 0) deviates significantly from any predictions. Findings for water and water-like interfaces can be interpreted in terms of the strength of hydrogen bonding at the surface.
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Affiliation(s)
- A Stocco
- Max Planck Institute of Colloids and Interfaces, 14476, Golm, Germany.
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Stocco A, Ferris JL, Anderson JR. Associative and temporal interference affect distinct prefrontal regions during memory retrieval. Neuroimage 2009. [DOI: 10.1016/s1053-8119(09)70173-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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Stocco A, Tauer K, Pispas S, Sigel R. Dynamics at the air-water interface revealed by evanescent wave light scattering. Eur Phys J E Soft Matter 2009; 29:95-105. [PMID: 19430825 DOI: 10.1140/epje/i2009-10455-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2008] [Revised: 12/23/2008] [Accepted: 03/25/2009] [Indexed: 05/27/2023]
Abstract
A new tool to study surface phenomena by evanescent wave light scattering is employed for an investigation of an aqueous surface through the water phase. When the angle of incidence passes the critical angle of total internal reflection, a high and narrow scattering peak is observed. It is discussed as an enhancement of scattering at critical angle illumination. Peak width and height are affected by the interfacial profile and the focusing of the beam. In addition, the propagation of capillary waves was studied at the surface of pure water and in the presence of latex particles and amphiphilic diblock copolymers. The range of the scattering vectors where propagating surface waves were detected is by far wider than standard surface quasi-elastic light scattering (SQELS) and comparable with those of X-ray photon correlation spectroscopy (XPCS).
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Affiliation(s)
- A Stocco
- Max Planck Institute of Colloids and Interfaces, 14476, Golm, Germany.
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Zang D, Stocco A, Langevin D, Wei B, Binks BP. An ellipsometry study of silica nanoparticle layers at the water surface. Phys Chem Chem Phys 2009; 11:9522-9. [DOI: 10.1039/b907903c] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Russo A, Dorigo E, Stocco A, Majone F. Persistence of chromosomal lesions induced in mouse bone marrow cells by mitomycin C, as evaluated by SCE analysis. Mutat Res 1993; 287:275-82. [PMID: 7685487 DOI: 10.1016/0027-5107(93)90020-g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [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: 01/26/2023]
Abstract
The frequency of sister-chromatid exchanges (SCE) was evaluated in mouse bone marrow cells at different time intervals (from 19 h to 10 days) after treatment i.p. with mitomycin C (MMC; 1 and 2 mg/kg body weight). Significantly higher frequencies of SCE were found during the first week after treatment, at both doses tested. This result confirms that chromosomal lesions induced by MMC in the mouse may persist in bone marrow cells, in agreement with previous evidence based on chromosomal aberration analysis in the same cell population. In addition, the observation of a unimodal distribution of SCE/cell frequencies at each time tested indicates that the bone marrow cell population on the whole is affected by increased SCE frequency, i.e., that persistent chromosomal lesions may be transmitted along with cell proliferation.
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Affiliation(s)
- A Russo
- Department of Biology, University of Padua, Italy
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Abstract
The persistence of chromosomal lesions induced in vivo by mitomycin C (MMC) was evaluated by cytogenetic analysis of mouse bone marrow cells. Chromosome aberration (CA) and micronucleus (MN) frequencies were estimated at different times after treatment, up to 42 days. The frequency of CA per cell decreased in the first 3 days after treatment, but a secondary peak appeared on the 4th day, followed by a stabilization around 0.03 CA per cell (significantly different from the control value), which persisted up to 17 days. At the next time intervals tested (28 and 42 days), the CA frequency returned to the control level. In disagreement with these data obtained directly on metaphases, the MN frequency, as evaluated in polychromatic erythrocytes, decreased quickly after treatment, reaching the control value on the 5th day. We attempted to enhance the sensitivity of the MN test by using CREST antibodies and indirect immunofluorescence. However, higher proportions of CREST- MN in treated than in control animals were observed only at short time intervals, confirming the results obtained with the conventional MN assay.
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Affiliation(s)
- A Russo
- Department of Biology, University of Padova, Italy
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Abstract
A methodology for the characterization of kinetochore-containing (CREST+) micronuclei (MN), based on the use of antikinetochore antibodies (derived from CREST patients) and indirect immunofluorescence, was applied to mouse bone marrow erythrocytes. The proposed protocol allows us to obtain fluorescent signals of good quality and highly reproducible data. The clastogenic agent mitomycin C (MMC; 1 mg/kg body wt) and the two aneugenic compounds chloral hydrate (CH; 200 mg/kg body wt) and colchicine (COL; 1 mg/kg body wt) were used to verify the sensitivity of this approach to chemicals with different mechanisms of action. These compounds were tested at a 20 h time interval from treatment and all of them were able to significantly increase (P less than 0.001) the frequency of MN in polychromatic erythrocytes. Of the MN observed in preparations from control animals, 45% were CREST+ and this percentage increased significantly (P less than 0.001) after treatment with CH or COL. On the contrary, only 22% CREST+ MN were found after treatment with MMC (statistical comparison with the control value: P less than 0.001). The CREST characterization of MN induced in vivo in mouse bone marrow allows us to infer the origin of MN formation, thus contributing to the identification of aneugenic agents.
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Affiliation(s)
- A Russo
- Department of Biology, University of Padova, Italy
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