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Fares N, Lavaud M, Zhang Z, Jha A, Amarouchene Y, Salez T. Observation of Brownian elastohydrodynamic forces acting on confined soft colloids. Proc Natl Acad Sci U S A 2024; 121:e2411956121. [PMID: 39365828 DOI: 10.1073/pnas.2411956121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2024] [Accepted: 08/01/2024] [Indexed: 10/06/2024] Open
Abstract
Confined motions in complex environments are ubiquitous in microbiology. These situations invariably involve the intricate coupling between fluid flow, soft boundaries, surface forces, and fluctuations. In the present study, such a coupling is investigated using a method combining holographic microscopy and advanced statistical inference. Specifically, the Brownian motion of soft micrometric oil droplets near rigid walls is quantitatively analyzed. All the key statistical observables are reconstructed with high precision, allowing for nanoscale resolution of local mobilities and femtonewton inference of conservative or nonconservative forces. Strikingly, the analysis reveals the existence of a novel, transient, but large, soft Brownian force. The latter might be of crucial importance for microbiological and nanophysical transport, target finding, or chemical reactions in crowded environments, and hence the whole life machinery.
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Affiliation(s)
- Nicolas Fares
- Univ. Bordeaux, CNRS, LOMA, UMR 5798, Talence F-33400, France
| | - Maxime Lavaud
- Univ. Bordeaux, CNRS, LOMA, UMR 5798, Talence F-33400, France
- Univ. Bordeaux, CNRS, Bordeaux INP, CBMN, UMR 5248, Pessac F-33600, France
| | - Zaicheng Zhang
- Univ. Bordeaux, CNRS, LOMA, UMR 5798, Talence F-33400, France
- School of Physics, Beihang University, Beijing 100191, China
| | - Aditya Jha
- Univ. Bordeaux, CNRS, LOMA, UMR 5798, Talence F-33400, France
| | | | - Thomas Salez
- Univ. Bordeaux, CNRS, LOMA, UMR 5798, Talence F-33400, France
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Li M, Mao A, Guan Q, Saiz E. Nature-inspired adhesive systems. Chem Soc Rev 2024; 53:8240-8305. [PMID: 38982929 DOI: 10.1039/d3cs00764b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/11/2024]
Abstract
Many organisms in nature thrive in intricate habitats through their unique bio-adhesive surfaces, facilitating tasks such as capturing prey and reproduction. It's important to note that the remarkable adhesion properties found in these natural biological surfaces primarily arise from their distinct micro- and nanostructures and/or chemical compositions. To create artificial surfaces with superior adhesion capabilities, researchers delve deeper into the underlying mechanisms of these captivating adhesion phenomena to draw inspiration. This article provides a systematic overview of various biological surfaces with different adhesion mechanisms, focusing on surface micro- and nanostructures and/or chemistry, offering design principles for their artificial counterparts. Here, the basic interactions and adhesion models of natural biological surfaces are introduced first. This will be followed by an exploration of research advancements in natural and artificial adhesive surfaces including both dry adhesive surfaces and wet/underwater adhesive surfaces, along with relevant adhesion characterization techniques. Special attention is paid to stimulus-responsive smart artificial adhesive surfaces with tunable adhesive properties. The goal is to spotlight recent advancements, identify common themes, and explore fundamental distinctions to pinpoint the present challenges and prospects in this field.
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Affiliation(s)
- Ming Li
- Centre of Advanced Structural Ceramics, Department of Materials, Imperial College London, London, SW7 2AZ, UK.
| | - Anran Mao
- Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, Teknikringen 56, 100 44 Stockholm, Sweden
| | - Qingwen Guan
- School of Chemistry, University of Glasgow, Glasgow, G12 8QQ, UK
| | - Eduardo Saiz
- Centre of Advanced Structural Ceramics, Department of Materials, Imperial College London, London, SW7 2AZ, UK.
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Bureau L, Coupier G, Salez T. Lift at low Reynolds number. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2023; 46:111. [PMID: 37957450 DOI: 10.1140/epje/s10189-023-00369-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2023] [Accepted: 10/19/2023] [Indexed: 11/15/2023]
Abstract
Lift forces are widespread in hydrodynamics. These are typically observed for big and fast objects and are often associated with a combination of fluid inertia (i.e. large Reynolds numbers) and specific symmetry-breaking mechanisms. In contrast, the properties of viscosity-dominated (i.e. low Reynolds numbers) flows make it more difficult for such lift forces to emerge. However, the inclusion of boundary effects qualitatively changes this picture. Indeed, in the context of soft and biological matter, recent studies have revealed the emergence of novel lift forces generated by boundary softness, flow gradients and/or surface charges. The aim of the present review is to gather and analyse this corpus of literature, in order to identify and unify the questioning within the associated communities, and pave the way towards future research.
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Affiliation(s)
- Lionel Bureau
- Univ. Grenoble Alpes, CNRS, LIPhy, 38000, Grenoble, France.
| | | | - Thomas Salez
- Univ. Bordeaux, CNRS, LOMA, UMR 5798, 33400, Talence, France.
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Kopecz-Muller C, Bertin V, Raphaël E, McGraw JD, Salez T. Mechanical response of a thick poroelastic gel in contactless colloidal-probe rheology. Proc Math Phys Eng Sci 2023. [DOI: 10.1098/rspa.2022.0832] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/10/2023] Open
Abstract
When a rigid object approaches a soft material in a viscous fluid, hydrodynamic stresses arise in the lubricated contact region and deform the soft material. The elastic deformation modifies in turn the flow, hence generating a soft-lubrication coupling. Moreover, soft elastomers and gels are often porous. These materials may be filled with solvent or uncrosslinked polymer chains, and might be permeable to the surrounding fluid, which further complexifies the description. Here, we derive the point-force response of a semi-infinite and permeable poroelastic substrate. Then, we use this fundamental solution in order to address the specific poroelastic lubrication coupling associated with contactless colloidal-probe methods. In particular, we derive the conservative and dissipative components of the force associated with the oscillating vertical motion of a sphere close to the poroelastic substrate. Our results may be relevant for dynamic surface force apparatus and contactless colloidal-probe atomic force microscopy experiments on soft, living and/or fragile materials, such as swollen hydrogels and biological membranes.
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Affiliation(s)
- Caroline Kopecz-Muller
- Univ. Bordeaux, CNRS, LOMA, UMR 5798, 33400 Talence, France
- Gulliver, CNRS UMR 7083, ESPCI Paris, Université PSL, 75005 Paris, France
- Institut Pierre-Gilles de Gennes, ESPCI Paris, Université PSL, 75005 Paris, France
| | - Vincent Bertin
- Physics of Fluids, Faculty of Sciences and Technology, University of Twente, 7500AE Enschede, The Netherlands
| | - Elie Raphaël
- Univ. Bordeaux, CNRS, LOMA, UMR 5798, 33400 Talence, France
| | - Joshua D. McGraw
- Univ. Bordeaux, CNRS, LOMA, UMR 5798, 33400 Talence, France
- Gulliver, CNRS UMR 7083, ESPCI Paris, Université PSL, 75005 Paris, France
| | - Thomas Salez
- Institut Pierre-Gilles de Gennes, ESPCI Paris, Université PSL, 75005 Paris, France
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Guerron A, Giasson S. Multiresponsive Microgels: Toward an Independent Tuning of Swelling and Surface Properties. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:11212-11221. [PMID: 34523940 DOI: 10.1021/acs.langmuir.1c01269] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Dual-responsive poly-(N-isopropylacrylamide) (PNIPAM) microgels surface-functionalized with polyethylene glycol (PEG) or poly-2-dimethylaminoethyl methacrylate (PDMAEMA) were developed to enable the swelling behavior and surface properties of the microgels to be tuned independently. The thermo-triggered swelling and pH-triggered surface properties of the microgels were investigated in aqueous suspensions using dynamic light scattering and on substrates using the surface forces apparatus. Grafting polymer chains on the microgel surface did not impede the thermo-triggered swelling behavior of the microgels in suspensions and immobilized on substrates. An unprecedented decoupling of the swelling behavior and surface properties could be obtained. More particularly, the thermo-triggered swelling behavior of the PNIPAM underlying microstructure could be tuned below and above the phase transition temperature with no change in the surface potential and adhesion provided by the surface non-responsive PEG.
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Affiliation(s)
- Alberto Guerron
- Faculty of Pharmacy, Université de Montréal, C. P. 6128, Succursale Centre-Ville, Montréal, Québec H3C 3J7, Canada
| | - Suzanne Giasson
- Faculty of Pharmacy, Université de Montréal, C. P. 6128, Succursale Centre-Ville, Montréal, Québec H3C 3J7, Canada
- Department of Chemistry, Université de Montréal, C. P. 6128, Succursale Centre-Ville, Montréal, Québec H3C 3J7, Canada
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Essink MH, Pandey A, Karpitschka S, Venner CH, Snoeijer JH. Regimes of Soft Lubrication. JOURNAL OF FLUID MECHANICS 2021; 915:A49. [PMID: 33746249 PMCID: PMC7610368 DOI: 10.1017/jfm.2021.96] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Elastohydrodynamic lubrication, or simply soft lubrication, refers to the motion of deformable objects near a boundary lubricated by a fluid, and is one of the key physical mechanisms to minimise friction and wear in natural and engineered systems. Hence it is of particular interest to relate the thickness of the lubricant layer to the entrainment (sliding/rolling) velocity, the mechanical loading exerted onto the contacting elements, and properties of the elastic boundary. In this work we provide an overview of the various regimes of soft lubrication for two-dimensional cylinders in lubricated contact with compliant walls. We discuss the limits of small and large entrainment velocity, which is equivalent to large and small elastic deformations, as the cylinder moves near thick or thin elastic layers. The analysis focusses on thin elastic coatings, both compressible and incompressible, for which analytical scaling laws are not yet available in the regime of large deformations. By analysing the elastohydrodynamic boundary layers that appear at the edge of the contact, we establish the missing scaling laws - including prefactors. As such, we offer a rather complete overview of physically relevant limits of soft lubrication.
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Affiliation(s)
- Martin H. Essink
- Physics of Fluids Group, Faculty of Science and Technology, Mesa+ Institute, University of Twente, 7500 AE Enschede, The Netherlands
| | - Anupam Pandey
- Physics of Fluids Group, Faculty of Science and Technology, Mesa+ Institute, University of Twente, 7500 AE Enschede, The Netherlands
- Department of Biological and Environmental Engineering, Cornell University, Ithaca, NY 14853, USA
| | - Stefan Karpitschka
- Max Planck Institute for Dynamics and Self-Organization (MPIDS), 37077 Göttingen, Germany
| | - Cornelis H. Venner
- Faculty of Engineering Technology, Engineering Fluid Dynamics, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
| | - Jacco H. Snoeijer
- Physics of Fluids Group, Faculty of Science and Technology, Mesa+ Institute, University of Twente, 7500 AE Enschede, The Netherlands
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Bauman L, Wen Q, Sameoto D, Yap CH, Zhao B. Durable poly(N-isopropylacrylamide) grafted PDMS micropillared surfaces for temperature-modulated wetting. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2020.125901] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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