1
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Pal A, Gope A, Sengupta A. Drying of bio-colloidal sessile droplets: Advances, applications, and perspectives. Adv Colloid Interface Sci 2023; 314:102870. [PMID: 37002959 DOI: 10.1016/j.cis.2023.102870] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2022] [Revised: 03/03/2023] [Accepted: 03/03/2023] [Indexed: 04/03/2023]
Abstract
Drying of biologically-relevant sessile droplets, including passive systems such as DNA, proteins, plasma, and blood, as well as active microbial systems comprising bacterial and algal dispersions, has garnered considerable attention over the last decades. Distinct morphological patterns emerge when bio-colloids undergo evaporative drying, with significant potential in a wide range of biomedical applications, spanning bio-sensing, medical diagnostics, drug delivery, and antimicrobial resistance. Consequently, the prospects of novel and thrifty bio-medical toolkits based on drying bio-colloids have driven tremendous progress in the science of morphological patterns and advanced quantitative image-based analysis. This review presents a comprehensive overview of bio-colloidal droplets drying on solid substrates, focusing on the experimental progress during the last ten years. We provide a summary of the physical and material properties of relevant bio-colloids and link their native composition (constituent particles, solvent, and concentrations) to the patterns emerging due to drying. We specifically examined the drying patterns generated by passive bio-colloids (e.g., DNA, globular, fibrous, composite proteins, plasma, serum, blood, urine, tears, and saliva). This article highlights how the emerging morphological patterns are influenced by the nature of the biological entities and the solvent, micro- and global environmental conditions (temperature and relative humidity), and substrate attributes like wettability. Crucially, correlations between emergent patterns and the initial droplet compositions enable the detection of potential clinical abnormalities when compared with the patterns of drying droplets of healthy control samples, offering a blueprint for the diagnosis of the type and stage of a specific disease (or disorder). Recent experimental investigations of pattern formation in the bio-mimetic and salivary drying droplets in the context of COVID-19 are also presented. We further summarized the role of biologically active agents in the drying process, including bacteria, algae, spermatozoa, and nematodes, and discussed the coupling between self-propulsion and hydrodynamics during the drying process. We wrap up the review by highlighting the role of cross-scale in situ experimental techniques for quantifying sub-micron to micro-scale features and the critical role of cross-disciplinary approaches (e.g., experimental and image processing techniques with machine learning algorithms) to quantify and predict the drying-induced features. We conclude the review with a perspective on the next generation of research and applications based on drying droplets, ultimately enabling innovative solutions and quantitative tools to investigate this exciting interface of physics, biology, data sciences, and machine learning.
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Affiliation(s)
- Anusuya Pal
- University of Warwick, Department of Physics, Coventry CV47AL, West Midlands, UK; Worcester Polytechnic Institute, Department of Physics, Worcester 01609, MA, USA.
| | - Amalesh Gope
- Tezpur University, Department of Linguistics and Language Technology, Tezpur 784028, Assam, India
| | - Anupam Sengupta
- University of Luxembourg, Physics of Living Matter, Department of Physics and Materials Science, Luxembourg L-1511, Luxembourg
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2
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Deleplace M, Dallagi H, Dubois T, Richard E, Ipatova A, Bénézech T, Faille C. Structure of deposits formed by drying of droplets contaminated with Bacillus spores determines their resistance to rinsing and cleaning. J FOOD ENG 2022. [DOI: 10.1016/j.jfoodeng.2021.110873] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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3
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Li W, Thian ES, Wang M, Wang Z, Ren L. Surface Design for Antibacterial Materials: From Fundamentals to Advanced Strategies. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2021; 8:e2100368. [PMID: 34351704 PMCID: PMC8498904 DOI: 10.1002/advs.202100368] [Citation(s) in RCA: 80] [Impact Index Per Article: 26.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2021] [Revised: 05/27/2021] [Indexed: 05/14/2023]
Abstract
Healthcare-acquired infections as well as increasing antimicrobial resistance have become an urgent global challenge, thus smart alternative solutions are needed to tackle bacterial infections. Antibacterial materials in biomedical applications and hospital hygiene have attracted great interest, in particular, the emergence of surface design strategies offer an effective alternative to antibiotics, thereby preventing the possible development of bacterial resistance. In this review, recent progress on advanced surface modifications to prevent bacterial infections are addressed comprehensively, starting with the key factors against bacterial adhesion, followed by varying strategies that can inhibit biofilm formation effectively. Furthermore, "super antibacterial systems" through pre-treatment defense and targeted bactericidal system, are proposed with increasing evidence of clinical potential. Finally, the advantages and future challenges of surface strategies to resist healthcare-associated infections are discussed, with promising prospects of developing novel antimicrobial materials.
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Affiliation(s)
- Wenlong Li
- Department of BiomaterialsState Key Lab of Physical Chemistry of Solid SurfaceCollege of MaterialsXiamen UniversityXiamen361005P. R. China
| | - Eng San Thian
- Department of Mechanical EngineeringNational University of SingaporeSingapore117576Singapore
| | - Miao Wang
- Department of BiomaterialsState Key Lab of Physical Chemistry of Solid SurfaceCollege of MaterialsXiamen UniversityXiamen361005P. R. China
| | - Zuyong Wang
- College of Materials Science and EngineeringHunan UniversityChangsha410082P. R. China
| | - Lei Ren
- Department of BiomaterialsState Key Lab of Physical Chemistry of Solid SurfaceCollege of MaterialsXiamen UniversityXiamen361005P. R. China
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4
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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] [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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5
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Richard E, Dubois T, Allion-Maurer A, Jha PK, Faille C. Hydrophobicity of abiotic surfaces governs droplets deposition and evaporation patterns. Food Microbiol 2020; 91:103538. [PMID: 32539949 DOI: 10.1016/j.fm.2020.103538] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Revised: 04/16/2020] [Accepted: 04/25/2020] [Indexed: 11/18/2022]
Abstract
Surface contamination with droplets containing bacteria is of concern in the food industry and other environments where hygiene control is essential. Deposition patterns after the drying of contaminated droplets is affected by numerous parameters. The present study evaluated the rate of evaporation and the shape of deposition patterns after the drying of water droplets on a panel of materials with different surface properties (topography, hydrophobicity). The influence of the particle properties (in this study 1 μm-microspheres and two bacterial spores) was also investigated. Polystyrene microspheres were hydrophobic, while Bacillus spores were hydrophilic or hydrophobic, and surrounded by different surface features. In contrast to material topography, hydrophobicity was shown to deeply affect droplet evaporation, with the formation of small, thick deposits with microspheres or hydrophilic spores. Among the particle properties, the spore morphology (size and round/ovoid shape) did not clearly affect the deposition pattern. Conversely, hydrophobic spores aggregated to form clusters, which quickly settled on the materials and either failed to migrate, or only migrated to a slight extent on the surface, resulting in a steady distribution of spores or spore clusters over the whole contaminated area. Adherent bacteria or spores are known to be highly resistant to many stressful environmental conditions. In view of all the quite different patterns obtained following drying of spore-containing droplets, it seems likely that some of these would entail enhanced resistance to hygienic processes.
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Affiliation(s)
- Elodie Richard
- Univ. Lille, CNRS, INSERM, CHU Lille, Institut Pasteur de Lille, US 41 - UMS 2014 - PLBS, F-59000, Lille, France
| | - Thomas Dubois
- Univ. Lille, CNRS, INRAE, ENSCL, UMET, F-59650, Villeneuve d'Ascq, France
| | - Audrey Allion-Maurer
- Aperam Isbergues Research Center - Solutions Dept., BP 15, F-62330, Isbergues, France
| | - Piyush Kumar Jha
- Univ. Lille, CNRS, INRAE, ENSCL, UMET, F-59650, Villeneuve d'Ascq, France
| | - Christine Faille
- Univ. Lille, CNRS, INRAE, ENSCL, UMET, F-59650, Villeneuve d'Ascq, France.
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6
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Astorga SE, Hu LX, Marsili E, Huang Y. Electrochemical Signature of
Escherichia coli
on Nickel Micropillar Array Electrode for Early Biofilm Characterization. ChemElectroChem 2019. [DOI: 10.1002/celc.201901063] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Solange E. Astorga
- School of Material Science and Engineering Nanyang Technological University 639977 Singapore
- Singapore Centre for Environmental Life Sciences Engineering (SCELSE) Nanyang Technological University 637551 Singapore
| | - Liang Xing Hu
- School of Mechanical and Aerospace Engineering Nanyang Technological University 639798 Singapore
| | - Enrico Marsili
- Singapore Centre for Environmental Life Sciences Engineering (SCELSE) Nanyang Technological University 637551 Singapore
- Department of Chemical and Materials Engineering Nazarbayev University 010000 Nur-Sultan Kazakhstan
- Environment & Resource Efficiency Cluster (EREC) Nazarbayev University 010000 Nur-Sultan Kazakhstan
| | - Yizhong Huang
- School of Material Science and Engineering Nanyang Technological University 639977 Singapore
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7
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Andac T, Weigmann P, Velu SKP, Pinçe E, Volpe G, Volpe G, Callegari A. Active matter alters the growth dynamics of coffee rings. SOFT MATTER 2019; 15:1488-1496. [PMID: 30570633 DOI: 10.1039/c8sm01350k] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
How particles are deposited at the edge of evaporating droplets, i.e. the coffee ring effect, plays a crucial role in phenomena as diverse as thin-film deposition, self-assembly, and biofilm formation. Recently, microorganisms have been shown to passively exploit and alter these deposition dynamics to increase their survival chances under harshening conditions. Here, we show that, as the droplet evaporation rate slows down, bacterial mobility starts playing a major role in determining the growth dynamics of the edge of drying droplets. Such motility-induced dynamics can influence several biophysical phenomena, from the formation of biofilms to the spreading of pathogens in humid environments and on surfaces subject to periodic drying. Analogous dynamics in other active matter systems can be exploited for technological applications in printing, coating, and self-assembly, where the standard coffee-ring effect is often a nuisance.
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Affiliation(s)
- Tugba Andac
- Soft Matter Lab, Department of Physics, Bilkent University, Ankara, Turkey.
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8
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Susarrey-Arce A, Hernández-Sánchez JF, Marcello M, Diaz-Fernandez Y, Oknianska A, Sorzabal-Bellido I, Tiggelaar R, Lohse D, Gardeniers H, Snoeijer J, Marin A, Raval R. Bacterial Footprints in Elastic Pillared Microstructures. ACS APPLIED BIO MATERIALS 2018; 1:1294-1300. [DOI: 10.1021/acsabm.8b00176] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Arturo Susarrey-Arce
- Open Innovation Hub for Antimicrobial Surfaces at the Surface Science Research Centre and Department of Chemistry, University of Liverpool, Oxford Street, Liverpool L69 3BX, United Kingdom
| | - José Federico Hernández-Sánchez
- Division of Physical Sciences and Engineering and Clean Combustion Research Center, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Marco Marcello
- Institute of Integrative Biology, University of Liverpool, Biosciences Building, Liverpool L69 7ZB, United Kingdom
| | - Yuri Diaz-Fernandez
- Open Innovation Hub for Antimicrobial Surfaces at the Surface Science Research Centre and Department of Chemistry, University of Liverpool, Oxford Street, Liverpool L69 3BX, United Kingdom
| | - Alina Oknianska
- School of Health Sciences, Liverpool Hope University, Hope Park, Liverpool L16 9JD, United Kingdom
| | - Ioritz Sorzabal-Bellido
- Open Innovation Hub for Antimicrobial Surfaces at the Surface Science Research Centre and Department of Chemistry, University of Liverpool, Oxford Street, Liverpool L69 3BX, United Kingdom
| | - Roald Tiggelaar
- NanoLab Cleanroom, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, Enschede 7500AE, The Netherlands
| | - Detlef Lohse
- Physics of Fluids Group, MESA+ Institute for Nanotechnology, J.M. Burgers Centre for Fluid Dynamics, University of Twente, P.O. Box 217, Enschede 7500AE, The Netherlands
| | - Han Gardeniers
- Mesoscale Chemical Systems, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, Enschede 7500AE, The Netherlands
| | - Jacco Snoeijer
- Physics of Fluids Group, MESA+ Institute for Nanotechnology, J.M. Burgers Centre for Fluid Dynamics, University of Twente, P.O. Box 217, Enschede 7500AE, The Netherlands
| | - Alvaro Marin
- Physics of Fluids Group, MESA+ Institute for Nanotechnology, J.M. Burgers Centre for Fluid Dynamics, University of Twente, P.O. Box 217, Enschede 7500AE, The Netherlands
| | - Rasmita Raval
- Open Innovation Hub for Antimicrobial Surfaces at the Surface Science Research Centre and Department of Chemistry, University of Liverpool, Oxford Street, Liverpool L69 3BX, United Kingdom
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9
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Ríos-Ramírez M, Reyes-Figueroa AD, Ruiz-Suárez JC, González-Gutiérrez J. Pattern formation of stains from dried drops to identify spermatozoa motility. Colloids Surf B Biointerfaces 2018; 169:486-493. [PMID: 29860013 DOI: 10.1016/j.colsurfb.2018.05.033] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2017] [Revised: 05/11/2018] [Accepted: 05/14/2018] [Indexed: 01/24/2023]
Abstract
We study how cell motility affects the stains left by the evaporation of droplets of a biofluid suspension containing mouse spermatozoa. The suspension, which contains also a high concentration of salts usually needed by motile cells, forms, upon drying, a crystallized pattern. We examine the structural characteristics of such patterns by optical microscopy. The analysis reveals that cell motility affects the formation of elongated crystals with lateral tips, as well as the creation of interlocked aggregates. We prove that a lacunarity algorithm based on polar symmetry, distinguishes among deposits generated by motile and non-motile cells with an accuracy greater than 95%.
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10
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Mazloomi Moqaddam A, Derome D, Carmeliet J. Dynamics of Contact Line Pinning and Depinning of Droplets Evaporating on Microribs. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:5635-5645. [PMID: 29667830 DOI: 10.1021/acs.langmuir.8b00409] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The contact line dynamics of evaporating droplets deposited on a set of parallel microribs is analyzed with the use of a recently developed entropic lattice Boltzmann model for two-phase flow. Upon deposition, part of the droplet penetrates into the space between ribs because of capillary action, whereas the remaining liquid of the droplet remains pinned on top of the microribs. In the first stage, evaporation continues until the droplet undergoes a series of pinning-depinning events, showing alternatively the constant contact radius and constant contact angle modes. While the droplet is pinned, evaporation results in a contact angle reduction, whereas the contact radius remains constant. At a critical contact angle, the contact line depins, the contact radius reduces, and the droplet rearranges to a larger apparent contact angle. This pinning-depinning behavior goes on until the liquid above the microribs is evaporated. By computing the Gibbs free energy taking into account the interfacial energy, pressure terms, and viscous dissipation due to drop internal flow, we found that the mechanism that causes the unpinning of the contact line results from an excess in Gibbs free energy. The spacing distance and the rib height play an important role in controlling the pinning-depinning cycling, the critical contact angle, and the excess Gibbs free energy. However, we found that neither the critical contact angle nor the maximum excess Gibbs free energy depends on the rib width. We show that the different terms, that is, pressure term, viscous dissipation, and interfacial energy, contributing to the excess Gibbs free energy, can be varied differently by varying different geometrical properties of the microribs. It is demonstrated that, by varying the spacing distance between the ribs, the energy barrier is controlled by the interfacial energy while the contribution of the viscous dissipation is dominant if either rib height or width is changed. Main finding of this is study is that, for microrib patterned surfaces, the energy barrier required for the contact line to depin can be enlarged by increasing the spacing or the rib height, which can be important for practical applications.
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Affiliation(s)
- Ali Mazloomi Moqaddam
- Chair of Building Physics, Department of Mechanical and Process Engineering , ETH Zurich , 8092 Zurich , Switzerland
- Laboratory for Multiscale Studies in Building Physics, Empa , Swiss Federal Laboratories for Materials Science and Technology , 8600 Dübendorf , Switzerland
| | - Dominique Derome
- Laboratory for Multiscale Studies in Building Physics, Empa , Swiss Federal Laboratories for Materials Science and Technology , 8600 Dübendorf , Switzerland
| | - Jan Carmeliet
- Chair of Building Physics, Department of Mechanical and Process Engineering , ETH Zurich , 8092 Zurich , Switzerland
- Laboratory for Multiscale Studies in Building Physics, Empa , Swiss Federal Laboratories for Materials Science and Technology , 8600 Dübendorf , Switzerland
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11
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Gao N, Chiu M, Neto C. Receding Contact Line Motion on Nanopatterned and Micropatterned Polymer Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:12602-12608. [PMID: 29016148 DOI: 10.1021/acs.langmuir.7b03100] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Surface properties such as topography and chemistry affect the motion of the three-phase contact line (solid/liquid/air), which in turn affects the contact angle of a liquid moving on a solid surface. In this work, the motion of the receding water contact line was studied on chemically and topographically patterned surfaces obtained from the dewetting of thin polymer films. The patterned surfaces consisted of hydrophilic poly(4-vinylpyridine) (P4VP) bumps, which were either microsized and sparse or nanosized and dense, on top of a hydrophobic polystyrene (PS) background layer. These patterns are designed for atmospheric water capture, for which the easy roll off of water droplets is crucial to their efficient performance. The dynamic receding water contact angle and contact line height of the patterned surfaces were measured by vertically withdrawing the surfaces from a water bath and compared to those of a flat P4VP substrate. For both the micropatterned and nanopatterned surfaces, the height of the dynamic contact lines normalized by the capillary length was characterized by the equilibrium limit that was predicted from static states. The nanopatterned surface had a faster increase in the normalized height as the capillary number increased. The dynamic receding contact angles on all surfaces studied decreased with increasing withdrawing velocity. Surprisingly, even for these patterned surfaces with high hysteresis, the dynamic receding contact angle followed the Cox-Voinov relation at capillary numbers of between 1 × 10-5 and 5 × 10-5.
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Affiliation(s)
- Nan Gao
- Future Industries Institute, University of South Australia , Mawson Lakes Campus, Adelaide, South Australia 5095, Australia
- School of Chemistry and Australian Institute for Nanoscale Science and Technology, The University of Sydney , Sydney, New South Wales 2006, Australia
| | - Ming Chiu
- School of Chemistry and Australian Institute for Nanoscale Science and Technology, The University of Sydney , Sydney, New South Wales 2006, Australia
| | - Chiara Neto
- School of Chemistry and Australian Institute for Nanoscale Science and Technology, The University of Sydney , Sydney, New South Wales 2006, Australia
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12
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Asayesh F, Zarabadi MP, Greener J. A new look at bubbles during biofilm inoculation reveals pronounced effects on growth and patterning. BIOMICROFLUIDICS 2017; 11:064109. [PMID: 29282421 PMCID: PMC5729033 DOI: 10.1063/1.5005932] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2017] [Accepted: 11/24/2017] [Indexed: 05/08/2023]
Abstract
Specially designed microfluidic bioflow cells were used to temporarily trap microbubbles during different inoculation stages of Pseudomonas sp. biofilms. Despite being eliminated many hours before biofilm appearance, templated growth could occur at former bubble positions. Bubble-templated growth was either continuous or in ring patterns, depending on the stage of inoculation when the bubbles were introduced. Templated biofilms were strongly enhanced in terms of their growth kinetics and structural homogeneity. High resolution confocal imaging showed two separate bubble-induced bacterial trapping modes, which were responsible for the altered biofilm development. It is concluded that static bubbles can be exploited for fundamental improvements to bioreactor performance, as well as open new avenues to study isolated bacteria and small colonies.
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Affiliation(s)
- Farnaz Asayesh
- Département de Chimie, Faculté des Sciences et de Génie, Université Laval, Quebec City, Quebec G1V 0A6, Canada
| | - Mir Pouyan Zarabadi
- Département de Chimie, Faculté des Sciences et de Génie, Université Laval, Quebec City, Quebec G1V 0A6, Canada
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13
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Shaikeea AJD, Basu S, Tyagi A, Sharma S, Hans R, Bansal L. Universal representations of evaporation modes in sessile droplets. PLoS One 2017; 12:e0184997. [PMID: 28915263 PMCID: PMC5600401 DOI: 10.1371/journal.pone.0184997] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2017] [Accepted: 09/04/2017] [Indexed: 11/18/2022] Open
Abstract
In this work, we provide a simple method to represent the contact line dynamics of an evaporating sessile droplet. As a droplet evaporates, two distinct contact line dynamics are observed. They are collectively known as modes of evaporation, namely Constant Contact Radius (CCR) and Constant Contact Angle (CCA). Another intermediate mode-Stick-Slide (SS) or mixed mode is also commonly observed. In this article, we are able to provide a graphical representation to these modes (named as MOE plot), which is visually more comprehensive especially for comparative studies. In addition, the method facilitates quantitative estimation for mode of evaporation (named as MOE fraction or MOEf), which doesn't exist in literature. Thus, various substrates can now be compared based on mode of evaporation (or contact line dynamics), which are governed by fluid property and surface characteristics.
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Affiliation(s)
| | - Saptarshi Basu
- Department of Mechanical Engineering, Indian Institute of Science, Bangalore, India
| | - Abhishek Tyagi
- Department of Mechanical Engineering, Indian Institute of Science, Bangalore, India
| | - Saksham Sharma
- Department of Mechanical Engineering, Indian Institute of Science, Bangalore, India
| | - Rishabh Hans
- Department of Mechanical Engineering, Indian Institute of Science, Bangalore, India
| | - Lalit Bansal
- Department of Mechanical Engineering, Indian Institute of Science, Bangalore, India
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14
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Xu G, Hong W, Sun W, Wang T, Tong Z. Effect of Salt Concentration on the Motion of Particles near the Substrate in Drying Sessile Colloidal Droplets. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:685-695. [PMID: 28045270 DOI: 10.1021/acs.langmuir.6b03899] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The motions of the particles on the substrate of a drying sessile colloidal droplet of water were measured using multiparticle tracking. Droplets with different concentrations (0-250 mM) of sodium chloride (NaCl) were compared. Several statistical quantities were proposed to characterize the heterogeneous behaviors of the particles and distinguish the effects of the flow field and the substrate interaction. For the salt-free droplet, most of the particles were nonadsorbed and mobile without friction. With the presence of salt, the fraction of the adsorbed particles increases with increasing evaporation time and the initial salt concentration, which was explained by Derjaguin-Landau-Verwey-Overbeek interaction. The fraction of mobile particles is mostly frictionless for all samples. At low salt concentrations, the velocity of mobile particles increases with the evaporation time to a peak and then decreases. The velocity is lower for higher salt concentrations. The effect of salt on the nonadsorbed particles was attributed to the electrokinetic effect.
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Affiliation(s)
- Guozhi Xu
- Research Institute of Materials Science, ‡State Key Laboratory of Luminescent Materials and Devices, and §State Key Laboratory of Pulp and Paper Engineering, South China University of Technology , Guangzhou 510640, China
| | - Wei Hong
- Research Institute of Materials Science, ‡State Key Laboratory of Luminescent Materials and Devices, and §State Key Laboratory of Pulp and Paper Engineering, South China University of Technology , Guangzhou 510640, China
| | - Weixiang Sun
- Research Institute of Materials Science, ‡State Key Laboratory of Luminescent Materials and Devices, and §State Key Laboratory of Pulp and Paper Engineering, South China University of Technology , Guangzhou 510640, China
| | - Tao Wang
- Research Institute of Materials Science, ‡State Key Laboratory of Luminescent Materials and Devices, and §State Key Laboratory of Pulp and Paper Engineering, South China University of Technology , Guangzhou 510640, China
| | - Zhen Tong
- Research Institute of Materials Science, ‡State Key Laboratory of Luminescent Materials and Devices, and §State Key Laboratory of Pulp and Paper Engineering, South China University of Technology , Guangzhou 510640, China
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