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Vialetto J, Gaichies T, Rudiuk S, Morel M, Baigl D. Versatile Deposition of Complex Colloidal Assemblies from the Evaporation of Hanging Drops. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2307893. [PMID: 38102826 PMCID: PMC10870021 DOI: 10.1002/advs.202307893] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Revised: 11/22/2023] [Indexed: 12/17/2023]
Abstract
Existing strategies designed to produce ordered arrangements of colloidal particles on solid supports are of great interest for their wide range of applications, from colloidal lithography, plasmonic and biomimetic surfaces to tags for anti-counterfeiting, but they all share various degrees of complexity hampering their facile implementation. Here, a drastically simplified methodology is presented to achieve ordered particle deposition, consisting in adding micromolar amounts of cationic surfactant to a colloidal suspension drop and let it evaporate in an upside-down configuration. Confinement at the air/water interface enables particle assembly into monolayers, which are then transferred on the substrate producing highly ordered structures displaying vivid, orientation-dependent structural colors. The method is compatible with many particle types and substrates, while controlling system parameters allows tuning the deposit size and morphology, from monocrystals to polycrystalline disks and "irises", from single-component to crystal alloys with Moiré patterns, demonstrating its practicality for a variety of processes.
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Affiliation(s)
- Jacopo Vialetto
- PASTEUR, Department of ChemistryÉcole Normale SupérieurePSL UniversitySorbonne UniversitéCNRSParis75005France
- Department of Chemistry and CSGIUniversity of Florencevia della Lastruccia 3, Sesto FiorentinoFirenzeI‐50019Italy
| | - Théophile Gaichies
- PASTEUR, Department of ChemistryÉcole Normale SupérieurePSL UniversitySorbonne UniversitéCNRSParis75005France
| | - Sergii Rudiuk
- PASTEUR, Department of ChemistryÉcole Normale SupérieurePSL UniversitySorbonne UniversitéCNRSParis75005France
| | - Mathieu Morel
- PASTEUR, Department of ChemistryÉcole Normale SupérieurePSL UniversitySorbonne UniversitéCNRSParis75005France
| | - Damien Baigl
- PASTEUR, Department of ChemistryÉcole Normale SupérieurePSL UniversitySorbonne UniversitéCNRSParis75005France
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2
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Hidalgo RBP, Molina-Courtois JN, Carreón YJP, Díaz-Hernández O, González-Gutiérrez J. Dried blood drops on vertical surfaces. Colloids Surf B Biointerfaces 2024; 234:113716. [PMID: 38160474 DOI: 10.1016/j.colsurfb.2023.113716] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Revised: 10/03/2023] [Accepted: 12/13/2023] [Indexed: 01/03/2024]
Abstract
The analysis of structures in dried droplets has made it possible to detect the presence and conformational state of macromolecules in relevant biofluids. Therefore, the implementation of novel drying strategies for pattern formation could facilitate the identification of biomarkers for the diagnosis of pathologies. We present an experimental study of patterns formed by evaporating water-diluted blood droplets on a vertical surface. Three significant morphological features were observed in vertical droplet deposits: (1) The highest concentration of non-volatile molecules is consistently deposited in the lower part of the droplet, regardless of erythrocyte concentration. (2) The central region of deposits decreases rapidly with hematocrit; (3) At high erythrocyte concentrations (36-40% HCT), a broad coating of blood serum is produced in the upper part of the deposit. These findings are supported by the radial intensity profile, the relative thickness of the crown, the aspect ratio of the deformation, the relative area of the central region, and the Entropy of the Gray Level Co-occurrence Matrix Entropy (GLCM). Moreover, we explore the pattern formation during the drying of vertical blood drops. We found that hematocrit concentration has a significant impact on droplet drying dynamics. Finally, we conducted a proof-of-concept test to investigate the impact of vertical droplet evaporation on blood droplets with varying lipid concentrations. The results revealed that it is possible to differentiate between deposits with normal, slightly elevated, and moderately elevated lipid levels using only the naked eye.
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Affiliation(s)
- Roxana Belen Pérez Hidalgo
- Facultad de Ciencias en Física y Matemáticas Universidad Autónoma de Chiapas, Tuxtla Gutiérrez, Chiapas, México
| | - Josías N Molina-Courtois
- Facultad de Ciencias en Física y Matemáticas Universidad Autónoma de Chiapas, Tuxtla Gutiérrez, Chiapas, México
| | - Yojana J P Carreón
- Facultad de Ciencias en Física y Matemáticas Universidad Autónoma de Chiapas, Tuxtla Gutiérrez, Chiapas, México; CONACyT, México City, México
| | - Orlando Díaz-Hernández
- Facultad de Ciencias en Física y Matemáticas Universidad Autónoma de Chiapas, Tuxtla Gutiérrez, Chiapas, México
| | - Jorge González-Gutiérrez
- Facultad de Ciencias en Física y Matemáticas Universidad Autónoma de Chiapas, Tuxtla Gutiérrez, Chiapas, México.
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3
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Kuk M, Pyeon J, Kim H. Vapor distribution changes evaporative flux profiles of a sessile droplet. J Colloid Interface Sci 2023; 652:646-652. [PMID: 37611470 DOI: 10.1016/j.jcis.2023.07.209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Revised: 07/25/2023] [Accepted: 07/31/2023] [Indexed: 08/25/2023]
Abstract
HYPOTHESIS We propose that during the evaporation of sessile droplets, the evaporative flux profile is primarily influenced by droplet geometry and composition under diffusion-limited conditions. Most studies have focused solely on the evaporation feature from the liquid to the gas phase, neglecting the extent to which the evaporated vapors affect the evaporation process. We hypothesize that if the molecular weight of the evaporated vapors is significantly high or low compared to the ambient gas, it could alter the evaporative flux. EXPERIMENTS We employed a direct optical measurement technique, specifically Mach-Zehnder interferometry. This demonstrated that the distribution of evaporated vapor molecules can substantially modify the evaporative flux profile. FINDINGS Our study discovered that substantial density gradients between vapor and air could either suppress or enhance the evaporative flux, depending on the droplet's orientation. This research offers fresh insights into evaporative fluxes by taking into account the relative vapor concentration and gravitational effects.
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Affiliation(s)
- Minhyeok Kuk
- Department of Mechanical Engineering, KAIST, Daejeon 34141, South Korea
| | - Jeongsu Pyeon
- Department of Mechanical Engineering, KAIST, Daejeon 34141, South Korea
| | - Hyoungsoo Kim
- Department of Mechanical Engineering, KAIST, Daejeon 34141, South Korea.
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Sasetty S, Ward T. Stability and critical volume of a suspended pendant drop in air via experiments and eigenvalue analysis. Colloids Surf A Physicochem Eng Asp 2023. [DOI: 10.1016/j.colsurfa.2023.131346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/29/2023]
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5
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Ye L, Li S, Huang X. Effect of Nanoparticle Addition on Evaporation of Jet Fuel Liquid Films and Nanoparticle Deposition Patterns during Evaporation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:15973-15983. [PMID: 36521023 DOI: 10.1021/acs.langmuir.2c02306] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Jet fuel-based nanofluid fuel has been proposed for improving the energy density and utilization efficiency of jet fuel that is widely applied in aircraft powered by aviation turbine engines. To recognize the evaporation behavior of the formed liquid film as a jet fuel-based nanofluid sprayed onto the engine wall or blades, this paper presents the evaporation and deposition characteristics of the jet fuel-based nanofluid liquid film adhering on the hydrophilic substrate. The changes in contact line, contact angle, volume, and deposition pattern during liquid film evaporation under different substrate temperatures, different nanoparticle concentrations, and different kinds of nanoparticle additions were investigated. The effect of nano-Al addition on the evaporation kinetics and deposition pattern of the nano-Al/jet fuel (nAl/JF) nanofluid fuel liquid film was explored. Repeated pinning and de-pinning of contact lines during evaporation occurred, resulting in the formation of concentric multi-ring deposition patterns. The addition of nano-Al increased the evaporation rate and shortened the evaporation lifetime, demonstrating a promotion effect on jet fuel liquid film evaporation. The existence of an energy barrier shows that the movement of three-phase contact lines on the hydrophilic solid surface presented not a continuous sliding behavior but a "stick-slip" behavior, and there were multiple jumps in contact lines and contact angles. Finally, a comparison was made with the deposition pattern of jet fuel liquid films with different graphite and Fe nanoparticle additions during evaporation. The mechanism of deposition phenomena was deeply revealed by the analysis of capillary flow and Marangoni recirculation.
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Affiliation(s)
- Linhui Ye
- Institute of Energy, Department of Physics, Hangzhou Dianzi University, Hangzhou310018, China
| | - Shengji Li
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou310018, China
| | - Xuefeng Huang
- Institute of Energy, Department of Physics, Hangzhou Dianzi University, Hangzhou310018, China
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Lee S, A. M. T, Cho G, Lee J. Control of the Drying Patterns for Complex Colloidal Solutions and Their Applications. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:2600. [PMID: 35957030 PMCID: PMC9370329 DOI: 10.3390/nano12152600] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/05/2022] [Revised: 07/24/2022] [Accepted: 07/25/2022] [Indexed: 12/02/2022]
Abstract
The uneven deposition at the edges of an evaporating droplet, termed the coffee-ring effect, has been extensively studied during the past few decades to better understand the underlying cause, namely the flow dynamics, and the subsequent patterns formed after drying. The non-uniform evaporation rate across the colloidal droplet hampers the formation of a uniform and homogeneous film in printed electronics, rechargeable batteries, etc., and often causes device failures. This review aims to highlight the diverse range of techniques used to alleviate the coffee-ring effect, from classic methods such as adding chemical additives, applying external sources, and manipulating geometrical configurations to recently developed advancements, specifically using bubbles, humidity, confined systems, etc., which do not involve modification of surface, particle or liquid properties. Each of these methodologies mitigates the edge deposition via multi-body interactions, for example, particle-liquid, particle-particle, particle-solid interfaces and particle-flow interactions. The mechanisms behind each of these approaches help to find methods to inhibit the non-uniform film formation, and the corresponding applications have been discussed together with a critical comparison in detail. This review could pave the way for developing inks and processes to apply in functional coatings and printed electronic devices with improved efficiency and device yield.
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Affiliation(s)
- Saebom Lee
- School of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Korea;
| | - Tiara A. M.
- Department of Biophysics, Sungkyunkwan University, Suwon 16419, Korea;
- Institute of Quantum Biophysics, Sungkyunkwan University, Suwon 16419, Korea
- Research Engineering Center for R2R Printed Flexible Computer, Sungkyunkwan University, Suwon 16419, Korea
| | - Gyoujin Cho
- Department of Biophysics, Sungkyunkwan University, Suwon 16419, Korea;
- Institute of Quantum Biophysics, Sungkyunkwan University, Suwon 16419, Korea
- Research Engineering Center for R2R Printed Flexible Computer, Sungkyunkwan University, Suwon 16419, Korea
- Department of Intelligent Precision Healthcare Convergence, Sungkyunkwan University, Suwon 16419, Korea
| | - Jinkee Lee
- School of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Korea;
- Institute of Quantum Biophysics, Sungkyunkwan University, Suwon 16419, Korea
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7
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Hu TY, Wang C, Yang KC, Chen LJ. Gravity effect of silica and polystyrene particles on deposition pattern control and particle size distribution on hydrophobic surfaces. J IND ENG CHEM 2022. [DOI: 10.1016/j.jiec.2021.10.030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Gopu M, Rathod S, Namangalam U, Pujala RK, Kumar SS, Mampallil D. Evaporation of Inclined Drops: Formation of Asymmetric Ring Patterns. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:8137-8143. [PMID: 32589843 DOI: 10.1021/acs.langmuir.0c01084] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Evaporation of colloidal drops on horizontal surfaces deposits the contained particles at the drop-edge producing radially symmetric ring-like stains. The symmetry in the particle deposition is broken when the drop is placed on a tilted surface due to the influence of gravity on the suspended particles and the drop itself. Using extremely small drops generated by electrospray, we explore cases where different mechanisms of particle transport dominate. We show that the asymmetric residues are formed as the gravity-induced effects compete with the capillary flow. Our results give a broad insight into the pattern formation of evaporating inclined drops.
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Affiliation(s)
- Maheshwar Gopu
- Department of Physics, Indian Institute of Science Education and Research, Mangalam, 517507 Tirupati, India
| | - Sachin Rathod
- Department of Physics, Indian Institute of Science Education and Research, Mangalam, 517507 Tirupati, India
| | - Uma Namangalam
- Department of Physics, Indian Institute of Science Education and Research, Mangalam, 517507 Tirupati, India
| | - Ravi Kumar Pujala
- Department of Physics, Indian Institute of Science Education and Research, Mangalam, 517507 Tirupati, India
| | - S Sunil Kumar
- Department of Physics, Indian Institute of Science Education and Research, Mangalam, 517507 Tirupati, India
| | - Dileep Mampallil
- Department of Physics, Indian Institute of Science Education and Research, Mangalam, 517507 Tirupati, India
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Thampi SP, Basavaraj MG. Beyond Coffee Rings: Drying Drops of Colloidal Dispersions on Inclined Substrates. ACS OMEGA 2020; 5:11262-11270. [PMID: 32478213 PMCID: PMC7254508 DOI: 10.1021/acsomega.9b04310] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Accepted: 04/27/2020] [Indexed: 05/22/2023]
Abstract
The patterns resulting from drying particle-laden sessile drops (for example, coffee rings, where the particles are concentrated more at the edge, and their complete suppression, where the particles are uniformly distributed throughout the pattern) have been well studied for more than two decades. For the ubiquitous instance of occurrence of drying of drops containing nonvolatile species (either dissolved or dispersed) on substrates oriented at different angles with respect to gravity, the investigation of resulting evaporative patterns has not received much attention. This mini-review addresses the need to investigate the drying of drops residing on inclined surfaces and highlights recent advances in this field.
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de Souza Lima R, Ré MI, Arlabosse P. Drying droplet as a template for solid formation: A review. POWDER TECHNOL 2020. [DOI: 10.1016/j.powtec.2019.09.052] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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11
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Ji B, Zhang L, Li M, Wang S, Law MK, Huang Y, Wen W, Zhou B. Suppression of coffee-ring effect via periodic oscillation of substrate for ultra-sensitive enrichment towards surface-enhanced Raman scattering. NANOSCALE 2019; 11:20534-20545. [PMID: 31498365 DOI: 10.1039/c9nr06989e] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Surface-enhanced Raman scattering (SERS) has attracted extensive interest due to excellent molecule recognition and sensitive concentration detection. Nevertheless, the coffee ring effect (CR) during the analyte evaporation always causes an uneven distribution of the assembled hot-spots, and hence the unreliable SERS signal is produced. In this study, for the first time, we present a suppressed coffee ring (SCR) system via a combination of a magnetically functionalized membrane and reciprocating magnetic field to dynamically suppress the CR for highly reliable and ultra-sensitive SERS detection. The enrichment mechanism of the nanoparticles and the analyte molecules within the sessile droplet based on the proposed system was studied. We experimentally observed that the driving frequency could well affect the final pattern, and typically a higher driving frequency facilitated a smaller coverage area with better enrichment performance. With the use of R6G molecule and (100 nm) gold nanoparticles, we examined the uniformity and SERS of the assembled 'hot-spots' in the SCR system. The results indicate that the uniformity can be greatly improved via SCR in comparison of ring stain, with the RSD of a Raman signal as low as 7.1% even at a low concentration of 10-12 mol L-1. Such system also enables the further enhancement in the SERS signal, with the detection limit down to 10-16 mol L-1, the enhancement factor magnitude up to 1013, and the linear relationship between the SERS intensity and the analyte concentrations within the range of 10-6-10-12 and 10-12-10-16 mol L-1, respectively. The applicability of the SCR-based SERS detection for diverse analytes was also proved with a similar but further enhanced signal of MB and 4-ATP. We believe that the excellent SCR-based SERS performance via the proposed system has great potentials for ultra-sensitive detection and/or precise quantitative analysis in various research fields and applications.
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Affiliation(s)
- Bing Ji
- Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering, University of Macau, Avenida da Universidade, Taipa, Macau, China.
| | - Lingjun Zhang
- Chongqing Key Laboratory of Soft Condensed Matter Physics and Smart Materials, College of Physics, Chongqing University, Chongqing, 400044, China
| | - Mingzhong Li
- State Key Laboratory of Analog and Mixed-Signal VLSI, University of Macau, Macau, China
| | - Shuangpeng Wang
- Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering, University of Macau, Avenida da Universidade, Taipa, Macau, China. and Department of Physics and Chemistry, Faculty of Science and Technology, University of Macau, Avenida da Universidade, Taipa, Macau, China
| | - Man-Kay Law
- State Key Laboratory of Analog and Mixed-Signal VLSI, University of Macau, Macau, China
| | - Yingzhou Huang
- Chongqing Key Laboratory of Soft Condensed Matter Physics and Smart Materials, College of Physics, Chongqing University, Chongqing, 400044, China
| | - Weijia Wen
- Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
| | - Bingpu Zhou
- Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering, University of Macau, Avenida da Universidade, Taipa, Macau, China. and Department of Physics and Chemistry, Faculty of Science and Technology, University of Macau, Avenida da Universidade, Taipa, Macau, China
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12
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Le Floch-Fouéré C, Lanotte L, Jeantet R, Pauchard L. The solute mechanical properties impact on the drying of dairy and model colloidal systems. SOFT MATTER 2019; 15:6190-6199. [PMID: 31328216 DOI: 10.1039/c9sm00373h] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The evaporation of colloidal solutions is frequently observed in nature and in everyday life. The investigation of the mechanisms taking place during the desiccation of biological fluids is currently a scientific challenge with potential biomedical and industrial applications. In the last few decades, seminal works have been performed mostly on dried droplets of saliva, urine and plasma. However, the full understanding of the drying process in biocolloids is far from being achieved and, notably, the impact of solute properties on the morphological characteristics of the evaporating droplets, such as colloid segregation, skin formation and crack pattern development, is still to be elucidated. For this purpose, the use of model colloidal solutions, whose rheological behavior is more easily deducible, could represent a significant boost. In this work, we compare the drying of droplets of whey proteins and casein micelles, the two main milk protein classes, to that of dispersions of silica particles and polymer-coated silica particles, respectively. The mechanical behavior of such biological colloids and model silica dispersions was investigated through the analysis of crack formation, and the measurements of their mechanical properties using indentation testing. The study reveals numerous analogies between dairy and the corresponding model systems, thus confirming the latter as a plausible powerful tool to highlight the signature of the matter at the molecular scale during the drying process.
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Affiliation(s)
| | - Luca Lanotte
- Laboratoire STLO, UMR1253, INRA, Agrocampus Ouest, F-35000 Rennes, France.
| | - Romain Jeantet
- Laboratoire STLO, UMR1253, INRA, Agrocampus Ouest, F-35000 Rennes, France.
| | - Ludovic Pauchard
- Laboratoire FAST, Univ. Paris-Sud, CNRS, Université Paris-Saclay, F-91405 Orsay, France
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Kumar PL, Mondal R, Thampi SP, Basavaraj MG. Reply to "Comment on 'Patterns in Drying Drops Dictated by Curvature-Driven Particle Transport'". LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:9991-9993. [PMID: 31291115 DOI: 10.1021/acs.langmuir.9b02139] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Hodges and Tangparitkul (Hodges, C. S.; Tangparitkul, S. M. Langmuir 2019, 35, doi: 10.1021/acs.langmuir.9b01442) in their Comment on "Patterns in Drying Drops Dictated by Curvature Driven Particle Transport" argue that the coffee-eye deposits in dried pendant drops can also be formed if the particles or particle clusters in the drying drop are large enough to sediment during the course of evaporation. In our reply to this comment, we compare these two different mechanisms, namely, gravity settling and curvature-driven interfacial migration of particles in the drying particle-laden drops, with an aim towards placing them in a correct perspective.
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Affiliation(s)
- P Logesh Kumar
- Polymer Engineering and Colloid Science Laboratory, Department of Chemical Engineering , Indian Institute of Technology Madras , Chennai 600036 , Tamil Nadu , India
| | - Ranajit Mondal
- Polymer Engineering and Colloid Science Laboratory, Department of Chemical Engineering , Indian Institute of Technology Madras , Chennai 600036 , Tamil Nadu , India
| | - Sumesh P Thampi
- Polymer Engineering and Colloid Science Laboratory, Department of Chemical Engineering , Indian Institute of Technology Madras , Chennai 600036 , Tamil Nadu , India
| | - Madivala G Basavaraj
- Polymer Engineering and Colloid Science Laboratory, Department of Chemical Engineering , Indian Institute of Technology Madras , Chennai 600036 , Tamil Nadu , India
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Hodges CS, Tangparitkul SM. Comment on "Patterns in Drying Drops Dictated by Curvature-Driven Particle Transport". LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:9988-9990. [PMID: 31322888 DOI: 10.1021/acs.langmuir.9b01442] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
In a recent article, Mondal et al. (Mondal, R.; Semwal, S.; Kumar, P. L.; Thampi, S. P.; Basavaraj, M. G. Langmuir 2018, 34, 11473-11483) demonstrated different patterns (coffee-rings and coffee-eyes) in dry deposits from solutions of concentrated well-stabilized nanofluids. Coffee rings created from dried sessile droplets result mainly from internal radial flow as proposed by Deegan et al. (Deegan, R. D.; Bakajin, O.; Dupont, T. F.; Huber, G.; Nagel, S. R.; Witten, T. A. Nature 1997, 389, 827-829). To generate coffee-eyes from pendent droplets, Mondal et al. have proposed a new particle transport route involving particle adsorption at the interface and its consequent curvature-driven settling along the interface due to gravity acting on the droplet. In this comment, we demonstrate that coffee-eyes can also be formed from pendent droplets by increasing the nanoparticle size to destabilize the colloidal liquid, causing nanoparticle accumulation at the water droplet apex without particle adsorption at the interface.
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Affiliation(s)
- Chris S Hodges
- School of Chemical and Process Engineering , University of Leeds , Leeds LS2 9JT , U.K
| | - S Mick Tangparitkul
- School of Chemical and Process Engineering , University of Leeds , Leeds LS2 9JT , U.K
- Department of Mining and Petroleum Engineering , Chiang Mai University , Chiang Mai 50200 , Thailand
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15
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Wang Y, Liang X, Ma K, Zhang H, Wang X, Xin JH, Zhang Q, Zhu S. Nature-Inspired Windmill for Water Collection in Complex Windy Environments. ACS APPLIED MATERIALS & INTERFACES 2019; 11:17952-17959. [PMID: 31007005 DOI: 10.1021/acsami.9b01294] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Nature-inspired water collection technology has been well-recognized as an effective solution for relieving water shortage hardships, and yet remains challenging when being used in an actual natural environment. In this work, we have successfully developed a promising water-collecting windmill that can be used in complex windy environments, by taking integrative inspiration from the liquid-manipulation strategies adopted by rice leaves, cacti, Nepenthes pitcher plants, and butterflies. The unique directional grooves on the blade surface with ridge-like walls with a shape gradient, combined with a molecular slippery layer, are crucial for not only water deposition but also directional drainage in water collection. Besides, the engineering design of rotatable blades turns the adverse effect of strong winds into a positive one, along with the nature-inspired surface topography and physicochemical property. Such a novel windmill has shown unprecedented water-collecting performance in a static environment, in strong wind, and in intermittent wind. Furthermore, the windmill can sense the wind-blowing direction and adjust its facing direction accordingly to ensure maximum utilization of wind power. It is believed that this work will bring a broad guiding significance to the design of smart water-harvesting materials and devices for application in more complex situations.
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Affiliation(s)
- Yuanfeng Wang
- School of Science and Engineering , The Chinese University of Hong Kong , Shenzhen 518172 , China
| | - Xin Liang
- School of Science and Engineering , The Chinese University of Hong Kong , Shenzhen 518172 , China
| | - Kaikai Ma
- Nanotechnology Centre, Institute of Textiles and Clothing , The Hong Kong Polytechnic University , Kowloon , Hong Kong SAR 999077 , China
| | - Haoran Zhang
- School of Science and Engineering , The Chinese University of Hong Kong , Shenzhen 518172 , China
| | - Xiang Wang
- School of Science and Engineering , The Chinese University of Hong Kong , Shenzhen 518172 , China
| | - John H Xin
- Nanotechnology Centre, Institute of Textiles and Clothing , The Hong Kong Polytechnic University , Kowloon , Hong Kong SAR 999077 , China
| | - Qi Zhang
- School of Science and Engineering , The Chinese University of Hong Kong , Shenzhen 518172 , China
| | - Shiping Zhu
- School of Science and Engineering , The Chinese University of Hong Kong , Shenzhen 518172 , China
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Li H, Buesen D, Williams R, Henig J, Stapf S, Mukherjee K, Freier E, Lubitz W, Winkler M, Happe T, Plumeré N. Preventing the coffee-ring effect and aggregate sedimentation by in situ gelation of monodisperse materials. Chem Sci 2018; 9:7596-7605. [PMID: 30393519 PMCID: PMC6182772 DOI: 10.1039/c8sc03302a] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2018] [Accepted: 08/23/2018] [Indexed: 11/21/2022] Open
Abstract
Drop-casting and inkjet printing are virtually the most versatile and cost-effective methods for depositing active materials on surfaces. However, drawbacks associated with the coffee-ring effect, as well as uncontrolled aggregation of the coating materials, have impeded the use of these methods for applications requiring high control of film properties. We now report on a simple method based on covalent cross-linking of monodisperse materials that enables the formation of thin films with homogeneous thicknesses and macroscale cohesion. The coffee-ring effect is impeded by triggering gelation of the coating materials via a thioacetate-disulfide transition which counterbalances the capillary forces induced by evaporation. Aggregates are prevented by monodisperse building blocks that ensure that the resulting gel resists sedimentation until complete droplet drying. This combined strategy yields an unprecedented level of homogeneity in the resulting film thickness in the 100 nm to 10 μm range. Moreover, macroscale cohesion is preserved as evidenced by the long-range charge transfer within the matrix. We highlight the impact of this method with bioelectrocatalysts for H2 and NADPH oxidation. Peak catalytic performances are reached at about 10-fold lower catalyst loading compared to conventional approaches owing to the high control on film cohesion and thickness homogeneity, thus setting new benchmarks in catalyst utilization.
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Affiliation(s)
- Huaiguang Li
- Center for Electrochemical Sciences (CES) , Faculty of Chemistry and Biochemistry , Ruhr University Bochum , Universitätsstr. 150 , D-44780 Bochum , Germany .
| | - Darren Buesen
- Center for Electrochemical Sciences (CES) , Faculty of Chemistry and Biochemistry , Ruhr University Bochum , Universitätsstr. 150 , D-44780 Bochum , Germany .
| | - Rhodri Williams
- Center for Electrochemical Sciences (CES) , Faculty of Chemistry and Biochemistry , Ruhr University Bochum , Universitätsstr. 150 , D-44780 Bochum , Germany .
| | - Joerg Henig
- Center for Electrochemical Sciences (CES) , Faculty of Chemistry and Biochemistry , Ruhr University Bochum , Universitätsstr. 150 , D-44780 Bochum , Germany .
| | - Stefanie Stapf
- Center for Electrochemical Sciences (CES) , Faculty of Chemistry and Biochemistry , Ruhr University Bochum , Universitätsstr. 150 , D-44780 Bochum , Germany .
| | - Kallol Mukherjee
- Lehrstuhl für Physikalische Chemie II , Ruhr-Universität Bochum , 44780 Bochum , Germany
| | - Erik Freier
- Leibniz-Institut für Analytische Wissenschaften -ISAS- e.V. , 44227 Dortmund , Germany
| | - Wolfgang Lubitz
- Max-Planck-Institut für Chemische Energiekonversion , Stiftstrasse 34-36 , 45470 Mülheim an der Ruhr , Germany
| | - Martin Winkler
- Lehrstuhl Biochemie der Pflanzen , Ruhr-Universität Bochum , 44780 Bochum , Germany
| | - Thomas Happe
- Lehrstuhl Biochemie der Pflanzen , Ruhr-Universität Bochum , 44780 Bochum , Germany
| | - Nicolas Plumeré
- Center for Electrochemical Sciences (CES) , Faculty of Chemistry and Biochemistry , Ruhr University Bochum , Universitätsstr. 150 , D-44780 Bochum , Germany .
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17
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Mondal R, Semwal S, Kumar PL, Thampi SP, Basavaraj MG. Patterns in Drying Drops Dictated by Curvature-Driven Particle Transport. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:11473-11483. [PMID: 30145905 DOI: 10.1021/acs.langmuir.8b02051] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Patterns generated by controlled evaporation of droplets containing colloids are dictated by internally generated flows. This advective particle transport is crucial to the efficacy of printing and coating processes and is also an elegant route to the self-assembly of particles. We propose a novel particle transport route, which involves adsorption of particles to the interface and subsequent curvature-driven migration of the particles along the interface. This interface-mediated transport can be exploited to control the distribution of particles in the dried patterns, which we experimentally elucidate by achieving gravity-induced drop shape changes. Our experiments demonstrate that the interplay between the bulk and the interfacial transport leads to strikingly different patterns: while dried aqueous sessile drops of colloidal dispersions produce well known "coffee-rings", dried pendant drops lead to "coffee-eyes". We support our experimental findings using scaling arguments. In previous studies, the effect of gravity-induced change in drop shape on the patterns formed in drying drops has been neglected. However, we show that the structure of the patterns formed by the colloidal particles after solvent evaporation is markedly different when the drops are deformed by gravity.
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Affiliation(s)
- Ranajit Mondal
- Polymer Engineering and Colloid Science Laboratory, Department of Chemical Engineering , Indian Institute of Technology Madras , Chennai 600036 , Tamil Nadu , India
| | - Shivani Semwal
- Polymer Engineering and Colloid Science Laboratory, Department of Chemical Engineering , Indian Institute of Technology Madras , Chennai 600036 , Tamil Nadu , India
| | - P Logesh Kumar
- Polymer Engineering and Colloid Science Laboratory, Department of Chemical Engineering , Indian Institute of Technology Madras , Chennai 600036 , Tamil Nadu , India
| | - Sumesh P Thampi
- Polymer Engineering and Colloid Science Laboratory, Department of Chemical Engineering , Indian Institute of Technology Madras , Chennai 600036 , Tamil Nadu , India
| | - Madivala G Basavaraj
- Polymer Engineering and Colloid Science Laboratory, Department of Chemical Engineering , Indian Institute of Technology Madras , Chennai 600036 , Tamil Nadu , India
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18
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Schulz M, Keddie JL. A critical and quantitative review of the stratification of particles during the drying of colloidal films. SOFT MATTER 2018; 14:6181-6197. [PMID: 30024010 DOI: 10.1039/c8sm01025k] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
For a wide range of applications, films are deposited from colloidal particles suspended in a volatile liquid. There is burgeoning interest in stratifying colloidal particles into separate layers within the final dry film to impart properties at the surface different to the interior. Here, we outline the mechanisms by which colloidal mixtures can stratify during the drying process. The problem is considered here as a three-way competition between evaporation of the continuous liquid, sedimentation of particles, and their Brownian diffusion. In particle mixtures, the sedimentation of larger or denser particles offers one means of stratification. When the rate of evaporation is fast relative to diffusion, binary mixtures of large and small particles can stratify with small particles on the top, according to physical models and computer simulations. We compare experimental results found in the scientific literature to the predictions of several recent models in a quantitative way. Although there is not perfect agreement between them, some general trends emerge in the experiments, simulations and models. The stratification of small particles on the top of a film is favoured when the colloidal suspension is dilute but when both the concentration of the small particles and the solvent evaporation rate are sufficiently high. A higher particle size ratio also favours stratification by size. This review points to ways that microstructures can be designed and controlled in colloidal materials to achieve desired properties.
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Affiliation(s)
- M Schulz
- Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, England, UK.
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19
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Trinh V, Xu J. An Experimental Study on Flow and Heat Transfer Characteristics of Ethanol/Polyalphaolefin Nanoemulsion Flowing Through Circular Minichannels. NANOSCALE RESEARCH LETTERS 2017; 12:216. [PMID: 28340526 PMCID: PMC5364128 DOI: 10.1186/s11671-017-1984-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/28/2016] [Accepted: 03/08/2017] [Indexed: 06/06/2023]
Abstract
This work experimentally studied the convective flow and heat transfer characteristics of a novel nanostructured heat transfer fluid: "ethanol/polyalphaolefin nanoemulsion" flowing through 12 circular minichannels of 1-mm diameter each. Ethanol/polyalphaolefin nanoemulsion is a thermodynamically stable system formed by dispersing ethanol into a mixture of "polyalphaolefin (PAO)" and surfactants. In this study, ethanol/PAO nanoemulsion is used as the working fluid to study the effect of ethanol nanodroplets on its convective flow and heat transfer characteristics. In addition, the effect of flow regime on its heat transfer is examined. It is found that using ethanol/PAO nanoemulsion fluids can improve convective heat transfer compared to that of pure PAO under both single- and two-phase flow regimes. For single-phase flow, there is no significant difference in Nusselt number between ethanol/PAO nanoemulsion and pure PAO in laminar flow regime. However, when entering transition flow regime, the ethanol/PAO nanoemulsion fluid showed a substantial increase in Nusselt number. Meanwhile, there is an increase in pressure drop and early onset of the laminar-turbulent transitional region for the ethanol/PAO nanoemulsion compared to pure PAO. The heat transfer coefficient of ethanol/PAO nanoemulsion can be further enhanced when the ethanol nanodroplets undergo phase change, which is hypothesized that such an effect is likely related to the enhanced interfacial thermal transport between the nanodroplets and base fluid under elevated temperature and the latent heat of phase changeable nanodroplets inside nanoemulsion. Further studies are needed to fully explore the convective heat transfer properties of nanoemulsion fluids.
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Affiliation(s)
- Vu Trinh
- Department of Mechanical Engineering, University of the District of Columbia, Washington, DC 20008 USA
| | - Jiajun Xu
- Department of Mechanical Engineering, University of the District of Columbia, Washington, DC 20008 USA
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20
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Nguyen TA, Biggs SR, Nguyen AV. Manipulating colloidal residue deposit from drying droplets: Air/liquid interface capture competes with coffee-ring effect. Chem Eng Sci 2017. [DOI: 10.1016/j.ces.2017.04.001] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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21
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Jafari Kang S, Vandadi V, Felske JD, Masoud H. Alternative mechanism for coffee-ring deposition based on active role of free surface. Phys Rev E 2016; 94:063104. [PMID: 28085318 DOI: 10.1103/physreve.94.063104] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2016] [Indexed: 05/12/2023]
Abstract
When a colloidal sessile droplet dries on a substrate, the particles suspended in it usually deposit in a ringlike pattern. This phenomenon is commonly referred to as the "coffee-ring" effect. One paradigm for why this occurs is as a consequence of the solutes being transported towards the pinned contact line by the flow inside the drop, which is induced by surface evaporation. From this perspective, the role of the liquid-gas interface in shaping the deposition pattern is somewhat minimized. Here, we propose an alternative mechanism for the coffee-ring deposition. It is based on the bulk flow within the drop transporting particles to the interface where they are captured by the receding free surface and subsequently transported along the interface until they are deposited near the contact line. That the interface captures the solutes as the evaporation proceeds is supported by a Lagrangian tracing of particles advected by the flow field within the droplet. We model the interfacial adsorption and transport of particles as a one-dimensional advection-generation process in toroidal coordinates and show that the theory reproduces ring-shaped depositions. Using this model, deposition patterns on both hydrophilic and hydrophobic surfaces are examined in which the evaporation is modeled as being either diffusive or uniform over the surface.
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Affiliation(s)
- Saeed Jafari Kang
- Department of Mechanical Engineering, University of Nevada, Reno, Nevada 89557, USA
| | - Vahid Vandadi
- Department of Mechanical Engineering, University of Nevada, Reno, Nevada 89557, USA
| | - James D Felske
- Department of Mechanical and Aerospace Engineering, State University of New York, Buffalo, New York 14260, USA
| | - Hassan Masoud
- Department of Mechanical Engineering, University of Nevada, Reno, Nevada 89557, USA
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22
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Persad AH, Ward CA. Expressions for the Evaporation and Condensation Coefficients in the Hertz-Knudsen Relation. Chem Rev 2016; 116:7727-67. [DOI: 10.1021/acs.chemrev.5b00511] [Citation(s) in RCA: 203] [Impact Index Per Article: 25.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Aaron H. Persad
- Department
of Mechanical
and Industrial Engineering, Thermodynamics and Kinetics Laboratory, University of Toronto, 5 King’s College Road, Toronto, Canada M5S 3G8
| | - Charles A. Ward
- Department
of Mechanical
and Industrial Engineering, Thermodynamics and Kinetics Laboratory, University of Toronto, 5 King’s College Road, Toronto, Canada M5S 3G8
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23
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Fortini A, Martín-Fabiani I, De La Haye JL, Dugas PY, Lansalot M, D'Agosto F, Bourgeat-Lami E, Keddie JL, Sear RP. Dynamic Stratification in Drying Films of Colloidal Mixtures. PHYSICAL REVIEW LETTERS 2016; 116:118301. [PMID: 27035324 DOI: 10.1103/physrevlett.116.118301] [Citation(s) in RCA: 77] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2015] [Indexed: 05/27/2023]
Abstract
In simulations and experiments, we study the drying of films containing mixtures of large and small colloidal particles in water. During drying, the mixture stratifies into a layer of the larger particles at the bottom with a layer of the smaller particles on top. We developed a model to show that a gradient in osmotic pressure, which develops dynamically during drying, is responsible for the segregation mechanism behind stratification.
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Affiliation(s)
- Andrea Fortini
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
- Theoretische Physik II, Physikalisches Institut, Universität Bayreuth, Universitätsstraße 30, D-95447 Bayreuth, Germany
| | | | - Jennifer Lesage De La Haye
- Laboratoire de Chimie, Catalyse, Polymères et Procédés, Université Claude Bernard Lyon 1, 69616 Villeurbanne cedex, France
| | - Pierre-Yves Dugas
- Laboratoire de Chimie, Catalyse, Polymères et Procédés, Université Claude Bernard Lyon 1, 69616 Villeurbanne cedex, France
| | - Muriel Lansalot
- Laboratoire de Chimie, Catalyse, Polymères et Procédés, Université Claude Bernard Lyon 1, 69616 Villeurbanne cedex, France
| | - Franck D'Agosto
- Laboratoire de Chimie, Catalyse, Polymères et Procédés, Université Claude Bernard Lyon 1, 69616 Villeurbanne cedex, France
| | - Elodie Bourgeat-Lami
- Laboratoire de Chimie, Catalyse, Polymères et Procédés, Université Claude Bernard Lyon 1, 69616 Villeurbanne cedex, France
| | - Joseph L Keddie
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - Richard P Sear
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
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24
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Bansal L, Miglani A, Basu S. Universal buckling kinetics in drying nanoparticle-laden droplets on a hydrophobic substrate. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2015; 92:042304. [PMID: 26565237 DOI: 10.1103/physreve.92.042304] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Indexed: 06/05/2023]
Abstract
We provide a comprehensive physical description of the vaporization, self-assembly, agglomeration, and buckling kinetics of sessile nanofluid droplets pinned on a hydrophobic substrate. We have deciphered five distinct regimes of the droplet life cycle. Regimes I-III consists of evaporation-induced preferential agglomeration that leads to the formation of a unique dome-shaped inhomogeneous shell with a stratified varying-density liquid core. Regime IV involves capillary-pressure-initiated shell buckling and stress-induced shell rupture. Regime V marks rupture-induced cavity inception and growth. We demonstrate through scaling arguments that the growth of the cavity (which controls the final morphology or structure) can be described by a universal function.
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Affiliation(s)
- Lalit Bansal
- Department of Mechanical Engineering, Indian Institute of Science, Bangalore, India-560012
| | - Ankur Miglani
- Department of Mechanical Engineering, Indian Institute of Science, Bangalore, India-560012
| | - Saptarshi Basu
- Department of Mechanical Engineering, Indian Institute of Science, Bangalore, India-560012
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25
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Control of stain geometry by drop evaporation of surfactant containing dispersions. Adv Colloid Interface Sci 2015; 222:275-90. [PMID: 25217332 DOI: 10.1016/j.cis.2014.08.004] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2014] [Revised: 08/16/2014] [Accepted: 08/18/2014] [Indexed: 11/22/2022]
Abstract
Control of stain geometry by drop evaporation of surfactant containing dispersions is an important topic of interest because it plays a crucial role in many applications such as forming templates on solid surfaces, in ink-jet printing, spraying of pesticides, micro/nano material fabrication, thin film coatings, biochemical assays, deposition of DNA/RNA micro-arrays, and manufacture of novel optical and electronic materials. This paper presents a review of the published articles on the diffusive drop evaporation of pure liquids (water), the surfactant stains obtained from evaporating drops that do not contain dispersed particles and deposits obtained from drops containing polymer colloids and carbon based particles such as carbon nanotubes, graphite and fullerenes. Experimental results of specific systems and modeling attempts are discussed. This review also has some special subtopics such as suppression of coffee-rings by surfactant addition and "stick-slip" behavior of evaporating nanosuspension drops. In general, the drop evaporation process of a surfactant/particle/substrate system is very complex since dissolved surfactants adsorb on both the insoluble organic/inorganic micro/nanoparticles in the drop, on the air/solution interface and on the substrate surface in different extends. Meanwhile, surfactant adsorbed particles interact with the substrate giving a specific contact angle, and free surfactants create a solutal Marangoni flow in the drop which controls the location of the particle deposition together with the rate of evaporation. In some cases, the presence of a surfactant monolayer at the air/solution interface alters the rate of evaporation. At present, the magnitude of each effect cannot be predicted adequately in advance and consequently they should be carefully studied for any system in order to control the shape and size of the final deposit.
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26
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Ahmad I, Jansen HP, van Swigchem J, Ganser C, Teichert C, Zandvliet HJ, Kooij ES. Evaporative gold nanorod assembly on chemically stripe-patterned gradient surfaces. J Colloid Interface Sci 2015; 449:261-9. [DOI: 10.1016/j.jcis.2014.12.067] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2014] [Revised: 12/19/2014] [Accepted: 12/19/2014] [Indexed: 11/27/2022]
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27
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Drying of a single droplet to investigate process–structure–function relationships: a review. ACTA ACUST UNITED AC 2014. [DOI: 10.1007/s13594-014-0186-1] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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28
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Nguyen TAH, Nguyen AV. Transient volume of evaporating sessile droplets: 2/3, 1/1, or another power law? LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:6544-6547. [PMID: 24873776 DOI: 10.1021/la4047287] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The transient shape and volume of evaporating sessile droplets are critical to our understanding and prediction of deposits left over on the solid surface after droplet evaporation. The 2/3 power law of scaling, (V/Vo)(β) = 1 - t/tf with β = 2/3, has been widely used. The 1/1 power law of scaling with β = 1 was also obtained for vanishingly small contact angles. Here we show that β significantly deviates from 2/3 and 1 when the droplet base is pinned: β depends on both initial and transient contact angles. The 1/1 power law presents the upper limit of β = 1, while β = 2/3 is the lower limit if contact angles are smaller than 148°. Unexpectedly, β can be smaller than 2/3 if contact angles are larger than 148°. We also present a semianalytical approximation for β as a function of the initial contact angle.
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Affiliation(s)
- Tuan A H Nguyen
- School of Chemical Engineering, The University of Queensland , Brisbane, QLD 4072, Australia
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29
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Diao M, Taran E, Mahler S, Nguyen TA, Nguyen AV. Quantifying adhesion of acidophilic bioleaching bacteria to silica and pyrite by atomic force microscopy with a bacterial probe. Colloids Surf B Biointerfaces 2014; 115:229-36. [DOI: 10.1016/j.colsurfb.2013.11.047] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2013] [Revised: 11/14/2013] [Accepted: 11/25/2013] [Indexed: 11/30/2022]
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30
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Kleijn SEF, Lai SCS, Koper MTM, Unwin PR. Electrochemistry of Nanoparticles. Angew Chem Int Ed Engl 2014; 53:3558-86. [DOI: 10.1002/anie.201306828] [Citation(s) in RCA: 304] [Impact Index Per Article: 30.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2013] [Indexed: 01/01/2023]
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31
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32
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Joksimovic R, Watanabe S, Riemer S, Gradzielski M, Yoshikawa K. Self-organized patterning through the dynamic segregation of DNA and silica nanoparticles. Sci Rep 2014; 4:3660. [PMID: 24413900 PMCID: PMC3888975 DOI: 10.1038/srep03660] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2013] [Accepted: 12/16/2013] [Indexed: 11/28/2022] Open
Abstract
Exotic pattern formation as a result of drying of an aqueous solution containing DNA and silica nanoparticles is reported. The pattern due to segregation was found to critically depend on the relative ratio of nanoparticles and DNA, as revealed by polarization microscopy, scanning electron microscopy, and fluorescence microscopy. The blurred radial pattern that is usually observed in the drying of a colloidal solution was shown to be vividly sharpened in the presence of DNA. Uniquely curved, crescent-shaped micrometer-scale domains are generated in regions that are rich in nanoparticles. The characteristic segregated patterns observed in the present study are interpreted in terms of a large aspect ratio between the persistence length (∼50 nm) and the diameter (∼2 nm) of double-stranded DNA, and the relatively small silica nanoparticles (radius: 5 nm).
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Affiliation(s)
- Rastko Joksimovic
- 1] Technische Universität Berlin, Institut für Chemie, Strasse des 17. Juni 124, Sekr. TC7, D-10623 Berlin, Germany [2] WPI-AIMR, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
| | - Shun Watanabe
- Faculty of Life and Medical Sciences, Doshisha University, Miyakodani, Kyotanabe, Kyoto 610-0394, Japan
| | - Sven Riemer
- Technische Universität Berlin, Institut für Chemie, Strasse des 17. Juni 124, Sekr. TC7, D-10623 Berlin, Germany
| | - Michael Gradzielski
- Technische Universität Berlin, Institut für Chemie, Strasse des 17. Juni 124, Sekr. TC7, D-10623 Berlin, Germany
| | - Kenichi Yoshikawa
- Faculty of Life and Medical Sciences, Doshisha University, Miyakodani, Kyotanabe, Kyoto 610-0394, Japan
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33
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Crivoi A, Duan F. Elimination of the Coffee-Ring Effect by Promoting Particle Adsorption and Long-Range Interaction. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:12067-74. [PMID: 24015843 DOI: 10.1021/la402544x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Affiliation(s)
- A. Crivoi
- School of Mechanical
and
Aerospace Engineering, Nanyang Technological University, Singapore 639798, Singapore
| | - Fei Duan
- School of Mechanical
and
Aerospace Engineering, Nanyang Technological University, Singapore 639798, Singapore
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34
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35
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Gilron J, Ladizansky Y, Korin E. Silica Fouling in Direct Contact Membrane Distillation. Ind Eng Chem Res 2013. [DOI: 10.1021/ie400265b] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jack Gilron
- Zuckerberg Institute
for Water Research, Blaustein Institutes for Desert Research and ‡Department of Chemical
Engineering, Ben-Gurion University of the Negev, Beer Sheva, Israel
| | - Yitzhak Ladizansky
- Zuckerberg Institute
for Water Research, Blaustein Institutes for Desert Research and ‡Department of Chemical
Engineering, Ben-Gurion University of the Negev, Beer Sheva, Israel
| | - Eli Korin
- Zuckerberg Institute
for Water Research, Blaustein Institutes for Desert Research and ‡Department of Chemical
Engineering, Ben-Gurion University of the Negev, Beer Sheva, Israel
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36
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Crivoi A, Duan F. Amplifying and attenuating the coffee-ring effect in drying sessile nanofluid droplets. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2013; 87:042303. [PMID: 23679410 DOI: 10.1103/physreve.87.042303] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2012] [Revised: 03/24/2013] [Indexed: 06/02/2023]
Abstract
Experiments and simulations to promote or attenuate the "coffee-ring effect" for pinned sessile nanofluid droplets are presented. The addition of surfactant inside a water suspension of aluminum oxide nanoparticles results in coffee-ring formation after the pinned sessile droplets are fully dried on a substrate, while droplets of the same suspension without the surfactant produce a fine uniform coverage. A mathematical model based on diffusion-limited cluster-cluster aggregation has been developed to explain the observed difference in the experiments. The simulations show that the particle sticking probability is a crucial factor on the morphology of finally dried structures.
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Affiliation(s)
- A Crivoi
- School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798
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