1
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Giubertoni G, Feng L, Klein K, Giannetti G, Rutten L, Choi Y, van der Net A, Castro-Linares G, Caporaletti F, Micha D, Hunger J, Deblais A, Bonn D, Sommerdijk N, Šarić A, Ilie IM, Koenderink GH, Woutersen S. Elucidating the role of water in collagen self-assembly by isotopically modulating collagen hydration. Proc Natl Acad Sci U S A 2024; 121:e2313162121. [PMID: 38451946 PMCID: PMC10945838 DOI: 10.1073/pnas.2313162121] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2023] [Accepted: 12/30/2023] [Indexed: 03/09/2024] Open
Abstract
Water is known to play an important role in collagen self-assembly, but it is still largely unclear how water-collagen interactions influence the assembly process and determine the fibril network properties. Here, we use the H[Formula: see text]O/D[Formula: see text]O isotope effect on the hydrogen-bond strength in water to investigate the role of hydration in collagen self-assembly. We dissolve collagen in H[Formula: see text]O and D[Formula: see text]O and compare the growth kinetics and the structure of the collagen assemblies formed in these water isotopomers. Surprisingly, collagen assembly occurs ten times faster in D[Formula: see text]O than in H[Formula: see text]O, and collagen in D[Formula: see text]O self-assembles into much thinner fibrils, that form a more inhomogeneous and softer network, with a fourfold reduction in elastic modulus when compared to H[Formula: see text]O. Combining spectroscopic measurements with atomistic simulations, we show that collagen in D[Formula: see text]O is less hydrated than in H[Formula: see text]O. This partial dehydration lowers the enthalpic penalty for water removal and reorganization at the collagen-water interface, increasing the self-assembly rate and the number of nucleation centers, leading to thinner fibrils and a softer network. Coarse-grained simulations show that the acceleration in the initial nucleation rate can be reproduced by the enhancement of electrostatic interactions. These results show that water acts as a mediator between collagen monomers, by modulating their interactions so as to optimize the assembly process and, thus, the final network properties. We believe that isotopically modulating the hydration of proteins can be a valuable method to investigate the role of water in protein structural dynamics and protein self-assembly.
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Affiliation(s)
- Giulia Giubertoni
- Van ’t Hoff Institute for Molecular Sciences, Department of Molecular Photonics, University of Amsterdam, Amsterdam1090 GD, The Netherlands
| | - Liru Feng
- Van ’t Hoff Institute for Molecular Sciences, Department of Molecular Photonics, University of Amsterdam, Amsterdam1090 GD, The Netherlands
| | - Kevin Klein
- Institute of Science and Technology Austria, Division of Mathematical and Physical Sciences, Klosterneuburg3400, Austria
- University College London, Division of Physics and Astronomy, LondonWC1E 6BT, United Kingdom
| | - Guido Giannetti
- Van ’t Hoff Institute for Molecular Sciences, Department of Molecular Photonics, University of Amsterdam, Amsterdam1090 GD, The Netherlands
| | - Luco Rutten
- Electron Microscopy Center, Radboud Technology Center Microscopy, Department of Medical BioSciences, Radboud University Medical Center, Nijmegen6525 GA, The Netherlands
| | - Yeji Choi
- Max Planck Institute for Polymer Research, Molecular Spectroscopy Department, Mainz55128, Germany
| | - Anouk van der Net
- Department of Bionanoscience, Kavli Institute of Nanoscience Delft, Delft University of Technology, Delft2628 HZ, The Netherlands
| | - Gerard Castro-Linares
- Department of Bionanoscience, Kavli Institute of Nanoscience Delft, Delft University of Technology, Delft2628 HZ, The Netherlands
| | - Federico Caporaletti
- Van ’t Hoff Institute for Molecular Sciences, Department of Molecular Photonics, University of Amsterdam, Amsterdam1090 GD, The Netherlands
- Van der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, Amsterdam1090 GL, The Netherlands
| | - Dimitra Micha
- Amsterdam University Medical Centers, Human Genetics Department, Vrije Universiteit, Amsterdam1007 MB, The Netherlands
| | - Johannes Hunger
- Max Planck Institute for Polymer Research, Molecular Spectroscopy Department, Mainz55128, Germany
| | - Antoine Deblais
- Van der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, Amsterdam1090 GL, The Netherlands
| | - Daniel Bonn
- Van der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, Amsterdam1090 GL, The Netherlands
| | - Nico Sommerdijk
- Electron Microscopy Center, Radboud Technology Center Microscopy, Department of Medical BioSciences, Radboud University Medical Center, Nijmegen6525 GA, The Netherlands
| | - Andela Šarić
- Institute of Science and Technology Austria, Division of Mathematical and Physical Sciences, Klosterneuburg3400, Austria
| | - Ioana M. Ilie
- Van ’t Hoff Institute for Molecular Sciences, Department of Molecular Photonics, University of Amsterdam, Amsterdam1090 GD, The Netherlands
- Amsterdam Center for Multiscale Modeling, University of Amsterdam, Amsterdam1090 GD, The Netherlands
| | - Gijsje H. Koenderink
- Department of Bionanoscience, Kavli Institute of Nanoscience Delft, Delft University of Technology, Delft2628 HZ, The Netherlands
| | - Sander Woutersen
- Van ’t Hoff Institute for Molecular Sciences, Department of Molecular Photonics, University of Amsterdam, Amsterdam1090 GD, The Netherlands
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2
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Lepinay SG, Deblais A, Habibi M, Bonn D, Shahidzadeh N. Capillary Forces Lead to Pendant Crystals at the Liquid-Air Interface of Evaporating Salt Solutions. Langmuir 2023; 39:18208-18214. [PMID: 38051540 PMCID: PMC10734214 DOI: 10.1021/acs.langmuir.3c01830] [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] [Received: 07/03/2023] [Revised: 11/07/2023] [Accepted: 11/11/2023] [Indexed: 12/07/2023]
Abstract
We investigated the nucleation and growth processes of individual NaCl crystals from an evaporating salt solution that is supersaturated. We find that crystals nucleate at the liquid/vapor interface, resulting in distinct "pendant" crystals, which reach millimeter dimensions. The substantial size of the crystals induces deformation of the interface. This process and the evaporation rate, in turn, determine the final crystal shape, which features a deep central cavity. Our findings reveal that a delicate balance exists between gravity, buoyancy, and the surface tension of the liquid/vapor interface that allows the crystal to remain pendant. When the contact angle of the crystal with the meniscus reaches 90°, the crystal disconnects from the interface and falls into the solution. We quantitatively predict the critical mass at which this occurs.
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Affiliation(s)
- Simon
E. G. Lepinay
- Institute
of Physics, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, Netherlands
| | - Antoine Deblais
- Institute
of Physics, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, Netherlands
| | - Mehdi Habibi
- Institute
of Physics, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, Netherlands
- Department
of Agrotechnology and Food Sciences, Wageningen
University and Research, Droevendaalsesteeg 4, 6708 PB Wageningen, Netherlands
| | - Daniel Bonn
- Institute
of Physics, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, Netherlands
| | - Noushine Shahidzadeh
- Institute
of Physics, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, Netherlands
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3
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Deblais A, Prathyusha KR, Sinaasappel R, Tuazon H, Tiwari I, Patil VP, Bhamla MS. Worm blobs as entangled living polymers: from topological active matter to flexible soft robot collectives. Soft Matter 2023; 19:7057-7069. [PMID: 37706563 PMCID: PMC10523214 DOI: 10.1039/d3sm00542a] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Accepted: 08/14/2023] [Indexed: 09/15/2023]
Abstract
Recently, the study of long, slender living worms has gained attention due to their unique ability to form highly entangled physical structures, exhibiting emergent behaviors. These organisms can assemble into an active three-dimensional soft entity referred to as the "blob", which exhibits both solid-like and liquid-like properties. This blob can respond to external stimuli such as light, to move or change shape. In this perspective article, we acknowledge the extensive and rich history of polymer physics, while illustrating how these living worms provide a fascinating experimental platform for investigating the physics of active, polymer-like entities. The combination of activity, long aspect ratio, and entanglement in these worms gives rise to a diverse range of emergent behaviors. By understanding the intricate dynamics of the worm blob, we could potentially stimulate further research into the behavior of entangled active polymers, and guide the advancement of synthetic topological active matter and bioinspired tangling soft robot collectives.
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Affiliation(s)
- Antoine Deblais
- van der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, 1098 XH Amsterdam, The Netherlands.
| | - K R Prathyusha
- School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA.
| | - Rosa Sinaasappel
- van der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, 1098 XH Amsterdam, The Netherlands.
| | - Harry Tuazon
- School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA.
| | - Ishant Tiwari
- School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA.
| | - Vishal P Patil
- Department of Bioengineering, Stanford University, Stanford, CA 94305, USA
| | - M Saad Bhamla
- School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA.
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4
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Bittermann MR, Morozova TI, Velandia SF, Mirzahossein E, Deblais A, Woutersen S, Bonn D. Surface-Mediated Molecular Transport of a Lipophilic Fluorescent Probe in Polydisperse Oil-in-Water Emulsions. Langmuir 2023; 39:4207-4215. [PMID: 36919825 PMCID: PMC10061922 DOI: 10.1021/acs.langmuir.2c02597] [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] [Figures] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Revised: 03/07/2023] [Indexed: 06/18/2023]
Abstract
Emulsions often act as carriers for water-insoluble solutes that are delivered to a specific target. The molecular transport of solutes in emulsions can be facilitated by surfactants and is often limited by diffusion through the continuous phase. We here investigate this transport on a molecular scale by using a lipophilic molecular rotor as a proxy for solutes. Using fluorescence lifetime microscopy we track the transport of these molecules from the continuous phase toward the dispersed phase in polydisperse oil-in-water emulsions. We show that this transport comprises two time scales, which vary significantly with droplet size and surfactant concentration, and, depending on the type of surfactant used, can be limited either by transport across the oil-water interface or by diffusion through the continuous phase. By studying the time-resolved fluorescence of the fluorophore, accompanied by molecular dynamics simulations, we demonstrate how the rate of transport observed on a macroscopic scale can be explained in terms of the local environment that the probe molecules are exposed to.
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Affiliation(s)
- Marius R. Bittermann
- Van
der Waals-Zeeman Institute, IoP, University
of Amsterdam, Science Park 904, 1098 XH Amsterdam, Netherlands
| | | | - Santiago F. Velandia
- Van
der Waals-Zeeman Institute, IoP, University
of Amsterdam, Science Park 904, 1098 XH Amsterdam, Netherlands
| | - Elham Mirzahossein
- Van
der Waals-Zeeman Institute, IoP, University
of Amsterdam, Science Park 904, 1098 XH Amsterdam, Netherlands
| | - Antoine Deblais
- Van
der Waals-Zeeman Institute, IoP, University
of Amsterdam, Science Park 904, 1098 XH Amsterdam, Netherlands
| | - Sander Woutersen
- Van
’t Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, Netherlands
| | - Daniel Bonn
- Van
der Waals-Zeeman Institute, IoP, University
of Amsterdam, Science Park 904, 1098 XH Amsterdam, Netherlands
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5
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Giubertoni G, Rombouts G, Caporaletti F, Deblais A, van Diest R, Reek JNH, Bonn D, Woutersen S. Infrared Diffusion-Ordered Spectroscopy Reveals Molecular Size and Structure. Angew Chem Int Ed Engl 2023; 62:e202213424. [PMID: 36259515 PMCID: PMC10107201 DOI: 10.1002/anie.202213424] [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: 09/12/2022] [Indexed: 11/07/2022]
Abstract
Inspired by ideas from NMR, we have developed Infrared Diffusion-Ordered Spectroscopy (IR-DOSY), which simultaneously characterizes molecular structure and size. We rely on the fact that the diffusion coefficient of a molecule is determined by its size through the Stokes-Einstein relation, and achieve sensitivity to the diffusion coefficient by creating a concentration gradient and tracking its equilibration in an IR-frequency resolved manner. Analogous to NMR-DOSY, a two-dimensional IR-DOSY spectrum has IR frequency along one axis and diffusion coefficient (or equivalently, size) along the other, so the chemical structure and the size of a compound are characterized simultaneously. In an IR-DOSY spectrum of a mixture, molecules with different sizes are nicely separated into distinct sets of IR peaks. Extending this idea to higher dimensions, we also perform 3D-IR-DOSY, in which we combine the conformation sensitivity of femtosecond multi-dimensional IR spectroscopy with size sensitivity.
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Affiliation(s)
- Giulia Giubertoni
- Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098XH, Amsterdam, The Netherlands
| | - Gijs Rombouts
- Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098XH, Amsterdam, The Netherlands
| | - Federico Caporaletti
- Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098XH, Amsterdam, The Netherlands.,Institute of Physics, University of Amsterdam, Science Park 904, 1098XH, Amsterdam, The Netherlands
| | - Antoine Deblais
- Institute of Physics, University of Amsterdam, Science Park 904, 1098XH, Amsterdam, The Netherlands
| | - Rianne van Diest
- Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098XH, Amsterdam, The Netherlands
| | - Joost N H Reek
- Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098XH, Amsterdam, The Netherlands
| | - Daniel Bonn
- Institute of Physics, University of Amsterdam, Science Park 904, 1098XH, Amsterdam, The Netherlands
| | - Sander Woutersen
- Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098XH, Amsterdam, The Netherlands
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6
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Pope F, Watson NI, Deblais A, Rothenberg G. Cover Feature: Understanding the Behaviour of Real Metaborates in Solution (ChemPhysChem 22/2022). Chemphyschem 2022. [DOI: 10.1002/cphc.202200764] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Frances Pope
- Van't Hoff Institute for Molecular Sciences University of Amsterdam Science Park 904 1098 XH Amsterdam The Netherlands
| | - Noë I. Watson
- Van't Hoff Institute for Molecular Sciences University of Amsterdam Science Park 904 1098 XH Amsterdam The Netherlands
| | - Antoine Deblais
- Institute of Physics University of Amsterdam Science Park 904 1098 XH Amsterdam The Netherlands
| | - Gadi Rothenberg
- Van't Hoff Institute for Molecular Sciences University of Amsterdam Science Park 904 1098 XH Amsterdam The Netherlands
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7
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Pope F, Watson NI, Deblais A, Rothenberg G. Understanding the Behaviour of Real Metaborates in Solution. Chemphyschem 2022; 23:e202200428. [PMID: 36069265 PMCID: PMC9825938 DOI: 10.1002/cphc.202200428] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Revised: 07/14/2022] [Indexed: 01/11/2023]
Abstract
Alkali metal borohydrides are promising candidates for large-scale hydrogen storage. They react spontaneously with water, generating dihydrogen and metaborate salts. While sodium borohydride is the most studied, potassium has the best chance of commercial application. Here we examine the physical and chemical properties of such self-hydrolysis solutions. We do this by following the hydrogen evolution, the pH changes, and monitoring the reaction intermediates using NMR. Most studies on such systems are done using dilute solutions, but real-life applications require high concentrations. We show that increasing the borohydride concentration radically changes the system's microstructure and rheology. The changes are seen already at concentrations as low as 5 w/w%, and are critical above 10 w/w%. While dilute solutions are Newtonian, concentrated reaction solutions display non-Newtonian behaviour, that we attribute to the formation and (dis)entanglement of metaborate oligomers. The implications of these findings towards using borohydride salts for hydrogen storage are discussed.
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Affiliation(s)
- Frances Pope
- Van't Hoff Institute for Molecular SciencesUniversity of AmsterdamScience Park 9041098 XHAmsterdamThe Netherlands
| | - Noë I. Watson
- Van't Hoff Institute for Molecular SciencesUniversity of AmsterdamScience Park 9041098 XHAmsterdamThe Netherlands
| | - Antoine Deblais
- Institute of PhysicsUniversity of AmsterdamScience Park 9041098 XHAmsterdamThe Netherlands
| | - Gadi Rothenberg
- Van't Hoff Institute for Molecular SciencesUniversity of AmsterdamScience Park 9041098 XHAmsterdamThe Netherlands
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8
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Giubertoni G, Rombouts G, Caporaletti F, Deblais A, Van Diest R, Reek J, Bonn D, Woutersen S. Infrared Diffusion‐Ordered Spectroscopy Reveals Molecular Size and Structure. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202213424] [Citation(s) in RCA: 0] [Impact Index Per Article: 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)
- Giulia Giubertoni
- University of Amsterdam: Universiteit van Amsterdam FNWI NETHERLANDS
| | - Gijs Rombouts
- University of Amsterdam: Universiteit van Amsterdam FNWI NETHERLANDS
| | | | - Antoine Deblais
- University of Amsterdam: Universiteit van Amsterdam FNWI NETHERLANDS
| | - Rianne Van Diest
- University of Amsterdam: Universiteit van Amsterdam FNWI NETHERLANDS
| | - Joost Reek
- University of Amsterdam: Universiteit van Amsterdam FNWI NETHERLANDS
| | - Daniel Bonn
- University of Amsterdam: Universiteit van Amsterdam FNWI NETHERLANDS
| | - Sander Woutersen
- Universiteit van Amsterdam HIMS Science Park 904 1098XH Amsterdam NETHERLANDS
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9
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Heeremans T, Deblais A, Bonn D, Woutersen S. Chromatographic separation of active polymer-like worm mixtures by contour length and activity. Sci Adv 2022; 8:eabj7918. [PMID: 35675403 PMCID: PMC9177071 DOI: 10.1126/sciadv.abj7918] [Citation(s) in RCA: 1] [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] [Indexed: 05/13/2023]
Abstract
The convective transport rate of polymers through confined geometries depends on their size, allowing for size-based separation of polymer mixtures (chromatography). Here, we investigate whether mixtures of active polymers can be separated in a similar manner based on their activity. We use thin, living Tubifex tubifex worms as a model system for active polymers and study the transport of these worms by an imposed flow through a channel filled with a hexagonal pillar array. The transport rate through the channel depends strongly on the degree of activity, an effect that we assign to the different distribution of conformations sampled by the worms depending on their activity. Our results demonstrate a unique way to sort mixtures of active polymers based on their activity and provide a versatile and convenient experimental system to investigate the hydrodynamics of active polymers.
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Affiliation(s)
- Tess Heeremans
- Van der Waals-Zeeman Institute, IoP, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, Netherlands
| | - Antoine Deblais
- Van der Waals-Zeeman Institute, IoP, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, Netherlands
- Corresponding author. (A.D.); (D.B.); (S.W.)
| | - Daniel Bonn
- Van der Waals-Zeeman Institute, IoP, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, Netherlands
- Corresponding author. (A.D.); (D.B.); (S.W.)
| | - Sander Woutersen
- Van ’t Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, Netherlands
- Corresponding author. (A.D.); (D.B.); (S.W.)
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10
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Boudet JF, Lintuvuori J, Lacouture C, Barois T, Deblais A, Xie K, Cassagnere S, Tregon B, Brückner DB, Baret JC, Kellay H. From collections of independent, mindless robots to flexible, mobile, and directional superstructures. Sci Robot 2021; 6:6/56/eabd0272. [PMID: 34290101 DOI: 10.1126/scirobotics.abd0272] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Accepted: 06/23/2021] [Indexed: 12/15/2022]
Abstract
A swarm of simple active particles confined in a flexible scaffold is a promising system to make mobile and deformable superstructures. These soft structures can perform tasks that are difficult to carry out for monolithic robots because they can infiltrate narrow spaces, smaller than their size, and move around obstacles. To achieve such tasks, the origin of the forces the superstructures develop, how they can be guided, and the effects of external environment, especially geometry and the presence of obstacles, need to be understood. Here, we report measurements of the forces developed by such superstructures, enclosing a number of mindless active rod-like robots, as well as the forces exerted by these structures to achieve a simple function, crossing a constriction. We relate these forces to the self-organization of the individual entities. Furthermore, and based on a physical understanding of what controls the mobility of these superstructures and the role of geometry in such a process, we devise a simple strategy where the environment can be designed to bias the mobility of the superstructure, giving rise to directional motion. Simple tasks-such as pulling a load, moving through an obstacle course, or cleaning up an arena-are demonstrated. Rudimentary control of the superstructures using light is also proposed. The results are of relevance to the making of robust flexible superstructures with nontrivial space exploration properties out of a swarm of simpler and cheaper robots.
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Affiliation(s)
- J F Boudet
- Univ. Bordeaux, CNRS, LOMA, UMR 5798, F-33400 Talence, France
| | - J Lintuvuori
- Univ. Bordeaux, CNRS, LOMA, UMR 5798, F-33400 Talence, France
| | - C Lacouture
- Univ. Bordeaux, CNRS, LOMA, UMR 5798, F-33400 Talence, France
| | - T Barois
- Univ. Bordeaux, CNRS, LOMA, UMR 5798, F-33400 Talence, France
| | - A Deblais
- Van der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, 1098XH Amsterdam, Netherlands
| | - K Xie
- Univ. Bordeaux, CNRS, LOMA, UMR 5798, F-33400 Talence, France
| | - S Cassagnere
- Univ. Bordeaux, CNRS, LOMA, UMR 5798, F-33400 Talence, France
| | - B Tregon
- Univ. Bordeaux, CNRS, LOMA, UMR 5798, F-33400 Talence, France
| | - D B Brückner
- Arnold Sommerfeld Center for Theoretical Physics and Center for NanoScience, Ludwig-Maximilian-University Munich, Theresienstr. 37, D-80333 Munich, Germany
| | - J C Baret
- Univ. Bordeaux, CNRS, CRPP-UMR5031, 33600 Pessac, France.,Institut Universitaire de France, 75005 Paris, France
| | - H Kellay
- Univ. Bordeaux, CNRS, LOMA, UMR 5798, F-33400 Talence, France. .,Institut Universitaire de France, 75005 Paris, France
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11
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Bittermann MR, Bonn D, Woutersen S, Deblais A. Light-switchable deposits from evaporating drops containing motile microalgae. Soft Matter 2021; 17:6536-6541. [PMID: 34259707 DOI: 10.1039/d1sm00792k] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Deposits from evaporating drops have been shown to take a variety of shapes, depending on the physicochemical properties of both solute and solvent. Classically, the evaporation of drops of colloidal suspensions leads to the so-called coffee ring effect, caused by radially outward flows. Here we investigate deposits from evaporating drops containing living motile microalgae (Chlamydomonas reinhardtii), which are capable of resisting these flows. We show that utilizing their light-sensitivity allows control of the final pattern: adjusting the wavelength and incident angle of the light source enables forcing the formation, completely suppressing and even directing the spatial structure of algal coffee rings.
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Affiliation(s)
- Marius R Bittermann
- Van der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands.
| | - Daniel Bonn
- Van der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands.
| | - Sander Woutersen
- Van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands
| | - Antoine Deblais
- Van der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands.
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12
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Kibbelaar HVM, Deblais A, Velikov KP, Bonn D, Shahidzadeh N. Stringiness of hyaluronic acid emulsions. Int J Cosmet Sci 2021; 43:458-465. [PMID: 34008867 PMCID: PMC8453728 DOI: 10.1111/ics.12711] [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] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Revised: 05/10/2021] [Accepted: 05/16/2021] [Indexed: 11/28/2022]
Abstract
Objective Cosmetic emulsions containing hyaluronic acid are ubiquitous in the cosmetic industry. However, the addition of (different molecular weight) hyaluronic acid can affect the filament stretching properties of concentrated emulsions. This property is often related to the “stringiness” of an emulsion, which can affect the consumer's choice for a product. It is thus very important to investigate and predict the effect of hyaluronic acid on the filament stretching properties of cosmetic emulsions. Methods Model emulsions and emulsions with low and high molecular weights are prepared and their filament stretching properties are studied by the use of an extensional rheometer. Two different stretching speeds are employed during the stretching of the emulsions, a low speed at 10 µm/s and a high speed at 10 mm/s. The shear rheology of the samples is measured by rotational rheology. Results We find that filament formation only occurs at high stretching speeds when the emulsion contains high molecular weight hyaluronic acid. The formation of this filament, which happens at intermediate states of the break‐up, coincides with an exponential decay in the break‐up dynamics. The beginning and end of the break‐up of high molecular weight hyaluronic acid emulsions show a power law behaviour, where the exponent depends on the initial stretching rate. At a lower stretching speed, no filament is observed for both high molecular weight and low molecular weight hyaluronic acid emulsions and the model emulsion. The emulsions show a power law behaviour over the whole break‐up range, where the exponent also depends on the stretching rate. No significant difference is observed between the shear flow properties of the emulsions containing different molecular weights hyaluronic acid. Conclusion In this work, we underline the importance of the molecular weight of hyaluronic acid on the elongational properties of concentrated emulsions. The filament formation properties, for example the stringiness, of an emulsion is a key determinant of a product liking and repeat purchase. Here, we find that high molecular weight hyaluronic acid and a high stretching speed are the control parameters affecting the filament formation of an emulsion.
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Affiliation(s)
- Heleen V M Kibbelaar
- Van der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, Amsterdam, The Netherlands
| | - Antoine Deblais
- Van der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, Amsterdam, The Netherlands
| | - Krassimir P Velikov
- Van der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, Amsterdam, The Netherlands.,Unilever Innovation Centre Wageningen, Wageningen, The Netherlands
| | - Daniel Bonn
- Van der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, Amsterdam, The Netherlands
| | - Noushine Shahidzadeh
- Van der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, Amsterdam, The Netherlands
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13
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Bittermann MR, Deblais A, Lépinay S, Bonn D, Shahidzadeh N. Author Correction: Deposits from evaporating emulsion drops. Sci Rep 2020; 10:17133. [PMID: 33028953 PMCID: PMC7542458 DOI: 10.1038/s41598-020-74408-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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14
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Dekker RI, Deblais A, Velikov KP, Veenstra P, Colin A, Kellay H, Kegel WK, Bonn D. Emulsion Destabilization by Squeeze Flow. Langmuir 2020; 36:7795-7800. [PMID: 32543206 PMCID: PMC7366505 DOI: 10.1021/acs.langmuir.0c00759] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/18/2020] [Revised: 06/15/2020] [Indexed: 06/11/2023]
Abstract
There is a large debate on the destabilization mechanism of emulsions. We present a simple technique using mechanical compression to destabilize oil-in-water emulsions. Upon compression of the emulsion, the continuous aqueous phase is squeezed out, while the dispersed oil phase progressively deforms from circular to honeycomb-like shapes. The films that separate the oil droplets are observed to thin and break at a critical oil/water ratio, leading to coalescence events. Electrostatic interactions and local droplet rearrangements do not determine film rupture. Instead, the destabilization occurs like an avalanche propagating through the system, starting at areas where the film thickness is smallest.
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Affiliation(s)
- Riande I. Dekker
- Van
der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
- Van’t
Hoff Laboratory of Physical and Colloid Chemistry, Debye Institute
for Nanomaterials Science, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
| | - Antoine Deblais
- Van
der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
- Unilever
Innovation Center Wageningen, Bronland 14, 6708 WH Wageningen, The Netherlands
| | - Krassimir P. Velikov
- Van
der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
- Unilever
Innovation Center Wageningen, Bronland 14, 6708 WH Wageningen, The Netherlands
- Soft
Condensed Matter, Debye Institute for Nanomaterials Science, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands
| | - Peter Veenstra
- Shell
Global Solutions International B.V., Grasweg 31, 1031 HW Amsterdam, The Netherlands
| | - Annie Colin
- Chimie Biologie
Innovation, ESPCI Paris, CNRS, PSL University, 10 rue Vauquelin, 75005 Paris, France
- Centre
de Recherche Paul Pascal, CNRS, Université de Bordeaux, 115 Avenue Schweitzer, 33600 Pessac, France
| | - Hamid Kellay
- Laboratoire
Ondes et Matière d’Aquitaine, UMR 5798, CNRS, Université
de Bordeaux, 351 Cours
de la Libération, 33405 Talence, France
| | - Willem K. Kegel
- Van’t
Hoff Laboratory of Physical and Colloid Chemistry, Debye Institute
for Nanomaterials Science, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
| | - Daniel Bonn
- Van
der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
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15
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Deblais A, Maggs AC, Bonn D, Woutersen S. Phase Separation by Entanglement of Active Polymerlike Worms. Phys Rev Lett 2020; 124:208006. [PMID: 32501051 DOI: 10.1103/physrevlett.124.208006] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Revised: 03/24/2020] [Accepted: 05/06/2020] [Indexed: 06/11/2023]
Abstract
We investigate the aggregation and phase separation of thin, living T. tubifex worms that behave as active polymers. Randomly dispersed active worms spontaneously aggregate to form compact, highly entangled blobs, a process similar to polymer phase separation, and for which we observe power-law growth kinetics. We find that the phase separation of active polymerlike worms does not occur through Ostwald ripening, but through active motion and coalescence of the phase domains. Interestingly, the growth mechanism differs from conventional growth by droplet coalescence: the diffusion constant characterizing the random motion of a worm blob is independent of its size, a phenomenon that can be explained from the fact that the active random motion arises from the worms at the surface of the blob. This leads to a fundamentally different phase-separation mechanism that may be unique to active polymers.
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Affiliation(s)
- A Deblais
- Van der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, 1098XH Amsterdam, The Netherlands
| | - A C Maggs
- UMR Gulliver 7083 CNRS, ESPCI, PSL Research University, 10 rue Vauquelin, 75005 Paris, France
| | - D Bonn
- Van der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, 1098XH Amsterdam, The Netherlands
| | - S Woutersen
- Van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098XH Amsterdam, The Netherlands
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16
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Deblais A, Woutersen S, Bonn D. Rheology of Entangled Active Polymer-Like T. Tubifex Worms. Phys Rev Lett 2020; 124:188002. [PMID: 32441969 DOI: 10.1103/physrevlett.124.188002] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Revised: 03/18/2020] [Accepted: 04/13/2020] [Indexed: 06/11/2023]
Abstract
We experimentally study the rheology of long, slender, and entangled living worms (Tubifex Tubifex). Their level of activity can be controlled by changing the temperature or by adding small amounts of alcohol to make the worms temporarily inactive. Performing classical rheology experiments on this entangled polymer-like system, we find that the rheology is qualitatively similar to that of usual polymers, but, quantitatively, (i) shear thinning is reduced by activity, (ii) the characteristic shear rate for the onset of shear-thinning is given by the time scale of the activity, and (iii) the low shear viscosity as a function of concentration shows a very different scaling from that of regular polymers. Our study paves the way towards a new experimental research field of active "polymer-like worms."
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Affiliation(s)
- A Deblais
- Van der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, 1098XH Amsterdam, The Netherlands
| | - S Woutersen
- Van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098XH Amsterdam, The Netherlands
| | - D Bonn
- Van der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, 1098XH Amsterdam, The Netherlands
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17
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Deblais A, Herrada MA, Hauner I, Velikov KP, van Roon T, Kellay H, Eggers J, Bonn D. Viscous Effects on Inertial Drop Formation. Phys Rev Lett 2018; 121:254501. [PMID: 30608844 DOI: 10.1103/physrevlett.121.254501] [Citation(s) in RCA: 7] [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: 06/06/2018] [Revised: 09/10/2018] [Indexed: 06/09/2023]
Abstract
The breakup of low-viscosity droplets like water is a ubiquitous and rich phenomenon. Theory predicts that in the inviscid limit one observes a finite-time singularity, giving rise to a universal power law, with a prefactor that is universal for a given density and surface tension. This universality has been proposed as a powerful tool to determine the dynamic surface tension at short time scales. We combine high-resolution experiments and simulations to show that this universality is unobservable in practice: in contrast to previous studies, we show that fluid and system parameters do play a role; notably a small amount of viscosity is sufficient to alter the breakup dynamics significantly.
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Affiliation(s)
- A Deblais
- Van der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, 1098XH Amsterdam, Netherlands
| | - M A Herrada
- Depto. de Mecánica de Fluidos e Ingeniería Aeroespacial, Universidad de Sevilla, E-41092 Sevilla, Spain
| | - I Hauner
- Van der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, 1098XH Amsterdam, Netherlands
| | - K P Velikov
- Van der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, 1098XH Amsterdam, Netherlands
- Unilever R&D Vlaardingen, Olivier van Noortlaan 120, 3133 AT Vlaardingen, Netherlands
| | - T van Roon
- Technology Centre, University of Amsterdam, 1098XH Amsterdam, Netherlands
| | - H Kellay
- Laboratoire Ondes et Matiere d'Aquitaine, UMR 5798 CNRS-U. Bx, Universite de Bordeaux, 351 cours de la Liberation 33405, Talence, France
| | - J Eggers
- School of Mathematics, University of Bristol, University Walk, Bristol BS8 1 TW, United Kingdom
| | - D Bonn
- Van der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, 1098XH Amsterdam, Netherlands
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18
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Abstract
Pearling instabilities of slender viscoelastic threads have received much attention, but remain incompletely understood. We study the instabilities in polymer solutions subject to uniaxial elongational flow. Two distinctly different instabilites are observed: beads on a string and blistering. The beads-on-a-string structure arises from a capillary instability whereas the blistering instability has a different origin: it is due to a coupling between stress and polymer concentration. By varying the temperature to change the solution properties we elucidate the interplay between flow and phase separation.
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Affiliation(s)
- A Deblais
- Van der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, 1098XH Amsterdam, Netherlands
| | - K P Velikov
- Van der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, 1098XH Amsterdam, Netherlands
- Unilever R&D Vlaardingen, Olivier van Noortlaan 120, 3133 AT Vlaardingen, Netherlands
| | - D Bonn
- Van der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, 1098XH Amsterdam, Netherlands
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19
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Deblais A, Barois T, Guerin T, Delville PH, Vaudaine R, Lintuvuori JS, Boudet JF, Baret JC, Kellay H. Boundaries Control Collective Dynamics of Inertial Self-Propelled Robots. Phys Rev Lett 2018; 120:188002. [PMID: 29775342 DOI: 10.1103/physrevlett.120.188002] [Citation(s) in RCA: 63] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2017] [Revised: 02/13/2018] [Indexed: 06/08/2023]
Abstract
Simple ingredients, such as well-defined interactions and couplings for the velocity and orientation of self-propelled objects, are sufficient to produce complex collective behavior in assemblies of such entities. Here, we use assemblies of rodlike robots made motile through self-vibration. When confined in circular arenas, dilute assemblies of these rods act as a gas. Increasing the surface fraction leads to a collective behavior near the boundaries: polar clusters emerge while, in the bulk, gaslike behavior is retained. The coexistence between a gas and surface clusters is a direct consequence of inertial effects as shown by our simulations. A theoretical model, based on surface mediated transport accounts for this coexistence and illustrates the exact role of the boundaries. Our study paves the way towards the control of collective behavior: By using deformable but free to move arenas, we demonstrate that the surface induced clusters can lead to directed motion, while the topology of the surface states can be controlled by biasing the motility of the particles.
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Affiliation(s)
- A Deblais
- Univ. Bordeaux, CNRS, LOMA, UMR 5798, F-33405 Talence, France
| | - T Barois
- Univ. Bordeaux, CNRS, LOMA, UMR 5798, F-33405 Talence, France
| | - T Guerin
- Univ. Bordeaux, CNRS, LOMA, UMR 5798, F-33405 Talence, France
| | - P H Delville
- Univ. Bordeaux, CNRS, LOMA, UMR 5798, F-33405 Talence, France
| | - R Vaudaine
- Univ. Bordeaux, CNRS, LOMA, UMR 5798, F-33405 Talence, France
| | - J S Lintuvuori
- Univ. Bordeaux, CNRS, LOMA, UMR 5798, F-33405 Talence, France
| | - J F Boudet
- Univ. Bordeaux, CNRS, LOMA, UMR 5798, F-33405 Talence, France
| | - J C Baret
- CNRS, Univ. Bordeaux, CRPP, UPR 8641, 115 Avenue Schweitzer, 33600 Pessac, France
| | - H Kellay
- Univ. Bordeaux, CNRS, LOMA, UMR 5798, F-33405 Talence, France
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20
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Khodaparast S, Atasi O, Deblais A, Scheid B, Stone HA. Dewetting of Thin Liquid Films Surrounding Air Bubbles in Microchannels. Langmuir 2018; 34:1363-1370. [PMID: 29239613 DOI: 10.1021/acs.langmuir.7b03839] [Citation(s) in RCA: 4] [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] [Indexed: 06/07/2023]
Abstract
As an air bubble translates in a microchannel, a thin film of liquid is formed on the bounding walls. In a microchannel with a rectangular cross-section, the liquid in the film leaks toward the low-pressure corners of the geometry, which leads to the appearance of local minima in the film thickness in the cross-sectional plane. In such a configuration, theory suggests that the minimum film thickness scales with Ca and Ca4/3 depending on the distance from the nose of the bubble, where Ca = μUb/γ is the flow capillary number based on the bubble velocity Ub, liquid viscosity μ, and surface tension γ, and Ca ≪ 1. We show that the film of a partially wetting liquid dewets on the channel wall at the sites of the local minima in the film thickness as it acquires thicknesses around and below 100 nm. Our experiments show that the distance Lw between the nose of the bubble and the initial dewetting location is a function of Ca and surface wettability. For channels of different wettability, Lw always scales proportional to Caα, where 1.7 < α < 2 for the range of 10-5 < Ca < 10-2. Moreover, Lw increases up to 10 times by enhancing the wettability of the surface at a given Ca. Our present measurements of Lw provide a design constraint on the lengths of bubbles to maintain a liquid wet channel without dry patches on the wall.
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Affiliation(s)
- S Khodaparast
- Department of Mechanical and Aerospace Engineering, Princeton University , Princeton, New Jersey 08544, United States
- Department of Chemical Engineering, Imperial College London , London SW7 2AZ, United Kingdom
| | - O Atasi
- Department of Mechanical and Aerospace Engineering, Princeton University , Princeton, New Jersey 08544, United States
- TIPs (Transfers, Interfaces and Processes), Université Libre de Bruxelles , Brussels 1050, Belgium
| | - A Deblais
- Van der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam , 1098XH Amsterdam, The Netherlands
| | - B Scheid
- TIPs (Transfers, Interfaces and Processes), Université Libre de Bruxelles , Brussels 1050, Belgium
| | - H A Stone
- Department of Mechanical and Aerospace Engineering, Princeton University , Princeton, New Jersey 08544, United States
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21
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Abstract
The surface tension of water is an important parameter for many biological or industrial processes, and roughly a factor of 3 higher than that of nonpolar liquids such as oils, which is usually attributed to hydrogen bonding and dipolar interactions. Here we show by studying the formation of water drops that the surface tension of a freshly created water surface is even higher (∼90 mN m-1) than under equilibrium conditions (∼72 mN m-1) with a relaxation process occurring on a long time scale (∼1 ms). Dynamic adsorption effects of protons or hydroxides may be at the origin of this dynamic surface tension. However, changing the pH does not significantly change the dynamic surface tension. It also seems unlikely that hydrogen bonding or dipole orientation effects play any role at the relatively long time scale probed in the experiments.
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Affiliation(s)
- Ines M. Hauner
- van
der Waals-Zeeman Institute, University of
Amsterdam, 1098XH Amsterdam, The Netherlands
- Chimie
ParisTech, PSL Research University, CNRS, Institut de Recherche de Chimie Paris, 75005 Paris, France
| | - Antoine Deblais
- Laboratoire
Ondes et Matière d’Aquitaine (UMR 5798 CNRS), University of Bordeaux, 351 cours de la Libération, 33405 Talence, France
| | - James K. Beattie
- School
of Chemistry, University of Sydney, Sydney, New South Wales 2006, Australia
| | - Hamid Kellay
- Laboratoire
Ondes et Matière d’Aquitaine (UMR 5798 CNRS), University of Bordeaux, 351 cours de la Libération, 33405 Talence, France
| | - Daniel Bonn
- van
der Waals-Zeeman Institute, University of
Amsterdam, 1098XH Amsterdam, The Netherlands
- E-mail:
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22
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Abstract
Coating surfaces with different fluids is prone to instability producing inhomogeneous films and patterns. The contact line between the coating fluid and the surface to be coated is host to different instabilities, limiting the use of a variety of coating techniques. Here we take advantage of the instability of a receding contact line towards cusp and droplet formation to produce linear patterns of variable spacings. We stabilize the instability of the cusps towards droplet formation by using polymer solutions that inhibit this secondary instability and give rise to long slender cylindrical filaments. We vary the speed of deposition to change the spacing between these filaments. The combination of the two gives rise to linear patterns into which different colloidal particles can be embedded, long DNA molecules can be stretched and particles filtered by size. The technique is therefore suitable to prepare anisotropic structures with variable properties.
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Affiliation(s)
- A. Deblais
- LOMA, Laboratoire Ondes et Matiere d'Aquitaine (UMR 5798), Universite de Bordeaux—CNRS, 33405 Talence, France
| | - R. Harich
- LOMA, Laboratoire Ondes et Matiere d'Aquitaine (UMR 5798), Universite de Bordeaux—CNRS, 33405 Talence, France
| | - A. Colin
- ESPCI, CNRS, SIMM UMR 7615, 11 rue Vauquelin, 75005 Paris, France
| | - H. Kellay
- LOMA, Laboratoire Ondes et Matiere d'Aquitaine (UMR 5798), Universite de Bordeaux—CNRS, 33405 Talence, France
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23
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Deblais A, Harich R, Bonn D, Colin A, Kellay H. Spreading of an Oil-in-Water Emulsion on a Glass Plate: Phase Inversion and Pattern Formation. Langmuir 2015; 31:5971-5981. [PMID: 26000801 DOI: 10.1021/la504639q] [Citation(s) in RCA: 5] [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: 06/04/2023]
Abstract
Rigid blade coating of glass plates by oil-in-water emulsions stabilized by surfactants is studied. Complete surface coverage is obtained only for speeds exceeding a threshold velocity dependent on the height between the blade end and the surface. Below this threshold, the emulsion can be inverted in the vicinity of the blade. The inversion dynamics of the oil-in-water emulsion and the deposition patterns induced by this phase inversion are studied using a microscope mounted set up. We show that these dynamics are universal for different volume fractions and deposition velocities. This inversion as well as the destabilization of the emulsion film deposited at high speeds gives rise to different patterns on the glass surface. These patterns are discussed in terms of the emulsion characteristics as well as the deposition velocity.
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Affiliation(s)
- A Deblais
- †Laboratoire Ondes et Matière d'Aquitaine, UMR 5798 CNRS-U. Bx, Université de Bordeaux, 351 cours de la Libération 33405, Talence, France
| | - R Harich
- †Laboratoire Ondes et Matière d'Aquitaine, UMR 5798 CNRS-U. Bx, Université de Bordeaux, 351 cours de la Libération 33405, Talence, France
| | - D Bonn
- ‡van der Waals-Zeeman Institute, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, Netherlands
| | - A Colin
- §Centre de Recherche Paul Pascal, CNRS UPR 8641, Université de Bordeaux, 115 av. Schweitzer, F-33600 Pessac, France
| | - H Kellay
- †Laboratoire Ondes et Matière d'Aquitaine, UMR 5798 CNRS-U. Bx, Université de Bordeaux, 351 cours de la Libération 33405, Talence, France
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