1
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Ding S, Yin Q, He Q, Feng X, Yang C, Gui X, Xing Y. Role of hydrophobic fine particles in coarse particle flotation: An analysis of bubble-particle attachment and detachment. Colloids Surf A Physicochem Eng Asp 2023. [DOI: 10.1016/j.colsurfa.2023.130980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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2
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Ma X, Nguyen NN, Nguyen AV. A review on quantifying the influence of lateral capillary interactions on the particle floatability and stability of particle-laden interfaces. Adv Colloid Interface Sci 2022; 307:102731. [DOI: 10.1016/j.cis.2022.102731] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2022] [Revised: 07/05/2022] [Accepted: 07/06/2022] [Indexed: 11/29/2022]
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3
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Nooshkam M, Varidi M, Alkobeisi F. Bioactive food foams stabilized by licorice extract/whey protein isolate/sodium alginate ternary complexes. Food Hydrocoll 2022. [DOI: 10.1016/j.foodhyd.2022.107488] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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4
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5
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Fortais A, Charlesworth K, Schulman RD, Dalnoki-Veress K. Spontaneous Elastocapillary Winding of Thin Elastic Fibers in Contact with Bubbles. PHYSICAL REVIEW LETTERS 2021; 127:218001. [PMID: 34860103 DOI: 10.1103/physrevlett.127.218001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Accepted: 10/19/2021] [Indexed: 06/13/2023]
Abstract
We study the elastocapillary interaction between flexible microfibers in contact with bubbles trapped at the surface of a liquid bath. Microfibers placed on top of bubbles are found to migrate to and wrap into a coil around the perimeter of the bubble for certain bubble-fiber size combinations. The wrapping process is spontaneous: the coil spins atop the bubble, thereby drawing in excess fiber floating on the bath. A two-dimensional microfiber coil emerges which increases the lifetime of the bubbles. A simple model incorporating surface and bending energies captures the spontaneous winding process.
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Affiliation(s)
- Adam Fortais
- Department of Physics and Astronomy, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4M1, Canada
| | - Kathleen Charlesworth
- Department of Physics and Astronomy, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4M1, Canada
| | - Rafael D Schulman
- Department of Physics and Astronomy, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4M1, Canada
| | - Kari Dalnoki-Veress
- Department of Physics and Astronomy, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4M1, Canada
- UMR CNRS Gulliver 7083, ESPCI Paris, PSL Research University, 75005 Paris, France
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6
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Vishal B. Foaming and rheological properties of aqueous solutions: an interfacial study. REV CHEM ENG 2021. [DOI: 10.1515/revce-2020-0060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Although aqueous foam is composed of simple fluids, air and water, it shows a complex rheological behavior. It exhibits solid-like behavior at low shear and fluid-like behavior at high shear rate. Therefore, understanding such behavior is important for many industrial applications in foods, pharmaceuticals, and cosmetics. Additionally, air–water interface of bubble surface plays an important role in the stabilizing mechanism of foams. Therefore, the rheological properties associated with the aqueous foam highly depend on its interfacial properties. In this review, a systematic study of aqueous foam are presented primarily from rheology point of view. Firstly, foaming agents, surfactants and particles are described; then foam structure was explained, followed by change in structure under applied shear. Finally, foam rheology was linked to interfacial rheology for the interface containing particles whose surface properties were altered by surfactants.
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Affiliation(s)
- Badri Vishal
- Department of Chemistry and Biochemistry , University of Hull , Hull , HU6 7RX , UK
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7
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Bournival G, Yang X, Ata S. The interaction of a bubble with a particle-laden interface in frother solutions. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.126609] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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8
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Jia H, Chen SH, Zhou ZM. Strength-enhanced nanocomposite foamed gel as a temporary wellbore plugging fluid: formulation design and working performance. J DISPER SCI TECHNOL 2021. [DOI: 10.1080/01932691.2020.1737104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Hu Jia
- State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan, China
| | - Sheng-Huai Chen
- State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan, China
| | - Zhao-Ming Zhou
- School of Mechatronic Engineering, Southwest Petroleum University, Chengdu, Sichuan, China
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9
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Ling X, Mayer A, Yang X, Bournival G, Ata S. Motion of Particles in a Monolayer Induced by Coalescing of a Bubble with a Planar Air-Water Interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:3648-3661. [PMID: 33745278 DOI: 10.1021/acs.langmuir.1c00012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The motion of particles in a monolayer induced by the coalescing of a bare bubble with a planar air-water interface was investigated in a modified Langmuir trough. Experiments were performed to understand the effect of particle hydrophobicity, subphase pH, packing density, the presence of a weak surfactant, and particle size distribution on the behavior of particle movement in the monolayer during the coalescence process. Video tracking software was used to track the particles and extract data based on the video footage. Visual inspection indicated that the coalescence of the bubble with the monolayer was a chaotic process which led the interface to oscillate to an extent that the particles underwent complete rearrangement. A simple analysis was carried out on the main forces involved in particle motion and rearrangement at the oscillating air-water interface. The motion characteristic of particles was evaluated by speed and mean-square displacement (MSD). The results showed that the butanol-treated particles had higher speed and MSD than the particles with a stronger affinity to the air-water interface. Similar results were also found at high subphase pH and low packing factor.
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Affiliation(s)
- Xiangyang Ling
- School of Minerals and Energy Resources Engineering, University of New South Wales, Sydney, NSW 2052, Australia
| | - Alexander Mayer
- School of Minerals and Energy Resources Engineering, University of New South Wales, Sydney, NSW 2052, Australia
| | - Xingshi Yang
- School of Minerals and Energy Resources Engineering, University of New South Wales, Sydney, NSW 2052, Australia
| | - Ghislain Bournival
- School of Minerals and Energy Resources Engineering, University of New South Wales, Sydney, NSW 2052, Australia
| | - Seher Ata
- School of Minerals and Energy Resources Engineering, University of New South Wales, Sydney, NSW 2052, Australia
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10
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Fayzi P, Bastani D, Lotfi M, Miller R. Influence of Surface‐Modified Nanoparticles on the Hydrodynamics of Rising Bubbles. Chem Eng Technol 2021. [DOI: 10.1002/ceat.201900234] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Pouyan Fayzi
- Sharif University of Technology Chemical & Petroleum Engineering Department 11155-9567 Tehran Iran
| | - Dariush Bastani
- Sharif University of Technology Chemical & Petroleum Engineering Department 11155-9567 Tehran Iran
| | - Marzieh Lotfi
- Jundi-Shapur University of Technology Department of Chemical Engineering 64615/334 Dezful Iran
| | - Reinhard Miller
- Technical University of Darmstadt Physics Department 64289 Darmstadt Germany
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11
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Li G, Wang K, Lu C. Spontaneous Agglomeration of Fluorinated Janus Particles and Its Effect on the Adsorption Behavior of Oil-Air Surfaces. Front Chem 2021; 8:602424. [PMID: 33490035 PMCID: PMC7820900 DOI: 10.3389/fchem.2020.602424] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Accepted: 12/11/2020] [Indexed: 11/16/2022] Open
Abstract
Based on the Pickering emulsion template method, two types of Janus particles with different relative amphiphilic areas for stabilizing non-aqueous foam were synthesized. In addition, particles with uniformly modified surface were synthesized for comparison. By adjusting oil mixtures, the behavior of particles on the oil-air surface was measured. Moreover, the role of particle agglomerates in surface adsorption process was investigated. Affected by the particle surface contact angle, the surface activity of Janus particles is not always greater than that of uniformly modified particles, which is reflected on delta surface tension and the volume of foam generated. The oil-surface adsorption process of synthesized Janus particles is not only occurred in the form of independent detached particles, but also in the form of particle agglomerates. The adsorption of the particles from the bulk phase to the surface requires the contact angle of the Cassie–Baxter composite surface of the particle agglomerates to be around 90°, but the inherent contact angle of the individual particles is <90°.
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Affiliation(s)
- Gen Li
- Department of Petroleum Engineering, Northeast Petroleum University, Daqing, China.,Key Laboratory of Enhanced Oil Recovery, Northeast Petroleum University, Ministry of Education, Daqing, China
| | - Keliang Wang
- Department of Petroleum Engineering, Northeast Petroleum University, Daqing, China.,Key Laboratory of Enhanced Oil Recovery, Northeast Petroleum University, Ministry of Education, Daqing, China
| | - Chunjing Lu
- Department of Petroleum Engineering, Northeast Petroleum University, Daqing, China.,Key Laboratory of Enhanced Oil Recovery, Northeast Petroleum University, Ministry of Education, Daqing, China
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12
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Wang H, Brito-Parada PR. The role of microparticles on the shape and surface tension of static bubbles. J Colloid Interface Sci 2020; 587:14-23. [PMID: 33360886 DOI: 10.1016/j.jcis.2020.11.094] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Revised: 11/23/2020] [Accepted: 11/24/2020] [Indexed: 12/27/2022]
Abstract
HYPOTHESIS Surface tension is a critical parameter in bubbles and foams, yet it is difficult to assess when microparticles are attached at the interface. By considering the interaction force between an air-liquid interface and microparticles, modified equations for sessile bubble tensiometry can be derived to determine the surface tension and shape of static microparticle-laden bubbles. EXPERIMENTS A modified sessile bubble method, in which the forces between microparticles and the air-liquid interface are considered, was developed and used to analyse the surface tension of bubbles fully coated by a monolayer of silica microparticles of different sizes. The results are compared to those obtained using classical sessile bubble tensiometry. The new method is also used to investigate the contours of particle-laden bubbles of varying particle radius and contact angle. FINDINGS While the classical sessile bubble method overestimates the surface tension, results obtained using the modified sessile bubble method show that the surface tension of static microparticle-laden bubbles remains the same as that of uncoated bubbles, with no dependency on the particle size. The discrepancy is due to the fact that microparticles attached to the air-liquid interface deform a bubble in a similar way that changes in surface tension do for uncoated bubbles.
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Affiliation(s)
- H Wang
- Department of Earth Science and Engineering, Imperial College London, London SW7 2AZ, UK.
| | - P R Brito-Parada
- Department of Earth Science and Engineering, Imperial College London, London SW7 2AZ, UK.
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13
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Ji X, Wang X, Zhang Y, Zang D. Interfacial viscoelasticity and jamming of colloidal particles at fluid-fluid interfaces: a review. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2020; 83:126601. [PMID: 32998118 DOI: 10.1088/1361-6633/abbcd8] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Colloidal particles can be adsorbed at fluid-fluid interfaces, a phenomenon frequently observed in particle-stabilized foams, Pickering emulsions, and bijels. Particles adsorbed at interfaces exhibit unique physical and chemical behaviors, which affect the mechanical properties of the interface. Therefore, interfacial colloidal particles are of interest in terms of both fundamental and applied research. In this paper, we review studies on the adsorption of colloidal particles at fluid-fluid interfaces, from both thermodynamic and mechanical points of view, and discuss the differences as compared with surfactants and polymers. The unique particle interactions induced by the interfaces as well as the particle dynamics including lateral diffusion and contact line relaxation will be presented. We focus on the rearrangement of the particles and the resultant interfacial viscoelasticity. Particular emphasis will be given to the effects of particle shape, size, and surface hydrophobicity on the interfacial particle assembly and the mechanical properties of the obtained particle layer. We will also summarize recent advances in interfacial jamming behavior caused by adsorption of particles at interfaces. The buckling and cracking behavior of particle layers will be discussed from a mechanical perspective. Finally, we suggest several potential directions for future research in this area.
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Affiliation(s)
- Xiaoliang Ji
- Soft Matter & Complex Fluids Group, School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an, 710129, People's Republic of China
| | - Xiaolu Wang
- Institute of Welding and Surface Engineering Technology, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, 100124, People's Republic of China
| | - Yongjian Zhang
- Shaanxi Key Laboratory of Surface Engineering and Remanufacturing, Xi'an University, Xi'an 710065, People's Republic of China
| | - Duyang Zang
- Soft Matter & Complex Fluids Group, School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an, 710129, People's Republic of China
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14
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Nuorivaara T, Serna-Guerrero R. Amphiphilic cellulose and surfactant mixtures as green frothers in mineral flotation. 1. Characterization of interfacial and foam stabilization properties. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2020.125297] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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15
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Dehdari B, Parsaei R, Riazi M, Rezaei N, Zendehboudi S. New insight into foam stability enhancement mechanism, using polyvinyl alcohol (PVA) and nanoparticles. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.112755] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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16
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17
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Ouf FX, Gelain T, Patry M, Salm F. Airborne release of hazardous micron-sized metallic/metal oxide particles during thermal degradation of polycarbonate surfaces contaminated by particles: Towards a phenomenological description. JOURNAL OF HAZARDOUS MATERIALS 2020; 384:121490. [PMID: 31706746 DOI: 10.1016/j.jhazmat.2019.121490] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Revised: 10/16/2019] [Accepted: 10/16/2019] [Indexed: 06/10/2023]
Abstract
The release of radioactive particles during fires is a key issue for the safety analysis of industrial nuclear facilities. Nevertheless, significant discrepancies exist between experimental measurements reported in the literature of airborne release fractions (ARF), expressed in terms of mass, and further discussions on the phenomenology of particles released from burning solid surfaces are needed. Experimental results are reported on the resuspension of metallic/metal oxide particles deposited on polycarbonate (PC) samples, representative of glove boxes used in the nuclear industry, under thermal degradation and for several particles deposit properties, i.e. equivalent volume diameter (Dev), density (ρp), morphology and number of mono-layer (Nmono). A significant influence of Dev and ρp was identified, with a peak in ARF for diameters close to 6 μm and a decreasing ARF with increasing density. Furthermore, the particle deposit structure was identified as an influencing parameter, with ARF decreasing with increasing Nmono up to nearly 0.3 and remaining constant above. Experimental results obtained in this study were compared with literature values to propose a phenomenological description of particles resuspension from burning PC surfaces. These findings open the way to a theoretical description of airborne release and to propose realistic surrogate to conduct large-scale fire experiments.
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Affiliation(s)
- F-X Ouf
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSN-RES, SCA, Gif-Sur-Yvette, 91192, France.
| | - T Gelain
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSN-RES, SCA, Gif-Sur-Yvette, 91192, France
| | - M Patry
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSN-RES, SCA, Gif-Sur-Yvette, 91192, France
| | - F Salm
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSN-RES, SCA, Gif-Sur-Yvette, 91192, France
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18
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Influence of gas fraction on wall-to-liquid heat transfer in dense bubbly flows. CHEMICAL ENGINEERING SCIENCE: X 2019. [DOI: 10.1016/j.cesx.2019.100037] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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19
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Chu P, Finch J, Bournival G, Ata S, Hamlett C, Pugh RJ. A review of bubble break-up. Adv Colloid Interface Sci 2019; 270:108-122. [PMID: 31202129 DOI: 10.1016/j.cis.2019.05.010] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2019] [Revised: 05/29/2019] [Accepted: 05/29/2019] [Indexed: 02/05/2023]
Abstract
The coalescence and break-up of bubbles are important steps in many industrial processes. To date, most of the literature has been focussed on the coalescence process which has been studied using high speed cinematographic techniques. However, bubble break-up is equally important and requires further research. This review essentially details the break-up process and initially summarizes the different types of bubble deformation processes which lead to break-up. Break-up is considered in high and low turbulent (pseudo-static) conditions and the effect of fluctuations and shear forces on the break-up is reviewed. Different mechanisms of break-up are discussed including shearing-off, coalescence induced pitching and impact pinching following air entrapment. Also, the influence of bubble size, interfacial stability, and surfactant on break-up are reviewed and a summary of recent experimental techniques presented. Finally, the break-up process which occurs in micro-fluidics is summarized.
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Affiliation(s)
- Pengbo Chu
- Department of Mining and Materials Engineering, McGill University, 3610 Rue University, Montreal, Quebec, Canada
| | - James Finch
- Department of Mining and Materials Engineering, McGill University, 3610 Rue University, Montreal, Quebec, Canada
| | - Ghislain Bournival
- School of Minerals and Energy Resources Engineering, University of New South Wales, Sydney, NSW, Australia
| | - Seher Ata
- School of Minerals and Energy Resources Engineering, University of New South Wales, Sydney, NSW, Australia.
| | - Christopher Hamlett
- Department of Physics and Mathematics, Nottingham Trent University, Nottingham, UK
| | - Robert J Pugh
- Department of Physics and Mathematics, Nottingham Trent University, Nottingham, UK.
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20
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Wang P, Cilliers JJ, Neethling SJ, Brito-Parada PR. Effect of Particle Size on the Rising Behavior of Particle-Laden Bubbles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:3680-3687. [PMID: 30785756 DOI: 10.1021/acs.langmuir.8b04112] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The rising behavior of bubbles, initially half and fully coated with glass beads of various sizes, was investigated. The bubble velocity, aspect ratio, and oscillation periods were determined using high-speed photography and image analysis. In addition, the acting forces, drag modification factor, and modified drag coefficient were calculated and interpreted. Results show that the aspect ratio oscillation of the rising bubbles is similar, irrespective of the attached particle size. As the particle size is increased, the rising bubbles have a lower velocity and aspect ratio amplitude, with the time from release to each aspect ratio peak increasing. Higher particle coverage is shown to decrease the bubble velocity and dampen the oscillations, reducing the number of aspect ratio peaks observed. The highest rise velocities correspond to the lowest aspect ratios and vice versa, whereas a constant aspect ratio yields a constant rise velocity, independent of the particle size. Force analysis shows that the particle drag modification factor increases with the increased particle size and is greatest for fully laden bubbles. The modified drag coefficient of particle-laden bubbles increases with the increased particle size, although it decreases with the increased Reynolds number independent of the particle size. The drag force exerted by the particles plays a more dominant role in decreasing bubble velocities as the particle size increases. The results and interpretation produced a quantitative description of the behavior of rising particle-laden bubbles and the development of correlations will enhance the modeling of industrial applications.
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Affiliation(s)
- Peipei Wang
- Advanced Mineral Processing Research Group, Department of Earth Science and Engineering , Imperial College London , London SW7 2AZ , U.K
| | - Jan J Cilliers
- Advanced Mineral Processing Research Group, Department of Earth Science and Engineering , Imperial College London , London SW7 2AZ , U.K
| | - Stephen J Neethling
- Advanced Mineral Processing Research Group, Department of Earth Science and Engineering , Imperial College London , London SW7 2AZ , U.K
| | - Pablo R Brito-Parada
- Advanced Mineral Processing Research Group, Department of Earth Science and Engineering , Imperial College London , London SW7 2AZ , U.K
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21
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Vishal B, Ghosh P. The effect of silica nanoparticles on the stability of aqueous foams. J DISPER SCI TECHNOL 2019. [DOI: 10.1080/01932691.2018.1467771] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Badri Vishal
- Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati, Assam, India
| | - Pallab Ghosh
- Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati, Assam, India
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22
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Yang X, Mayer A, Bournival G, Pugh R, Ata S. Experimental Technique to Study the Interaction Between a Bubble and the Particle-Laden Interface. Front Chem 2018; 6:348. [PMID: 30155463 PMCID: PMC6102402 DOI: 10.3389/fchem.2018.00348] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Accepted: 07/25/2018] [Indexed: 11/13/2022] Open
Abstract
An experimental apparatus was developed based on the Langmuir-Blodgett trough design to investigate the compression of monolayers of micron size spherical glass particles at the air-water interface and the interaction of an air bubble with the monolayers. The setup modifies the regular Langmuir-Blodgett trough by using a deep and clear glass cell. The cell allowed both the optical observation of the particle monolayer and the insertion of a capillary to produce a bubble under the layer of particles. Surface pressure-area (Π-A) isotherms were measured while the particles rearranged at the interface during compression and expansion for different pH values and particle wettability. We also analyzed the motion of particles in the monolayer by the surface pressure and packing factor to gain further insights into the behavior of particles during the coalescence process. The results suggested that the coalescence of a bubble was dependent on the formation of a defect in the particle layer and the defect size was both strongly influenced by particle hydrophobicity and the pH of the subphase.
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Affiliation(s)
- Xingshi Yang
- School of Mining Engineering, University of New South Wales, Sydney, NSW, Australia
| | - Alexander Mayer
- School of Mining Engineering, University of New South Wales, Sydney, NSW, Australia
| | - Ghislain Bournival
- School of Mining Engineering, University of New South Wales, Sydney, NSW, Australia
| | - Robert Pugh
- Department of Physics and Mathematics, Nottingham Trent University, Nottingham, United Kingdom
| | - Seher Ata
- School of Mining Engineering, University of New South Wales, Sydney, NSW, Australia
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23
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Das S, Koplik J, Farinato R, Nagaraj DR, Maldarelli C, Somasundaran P. The Translational and Rotational Dynamics of a Colloid Moving Along the Air-Liquid Interface of a Thin Film. Sci Rep 2018; 8:8910. [PMID: 29891986 PMCID: PMC5995853 DOI: 10.1038/s41598-018-26121-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Accepted: 05/02/2018] [Indexed: 11/16/2022] Open
Abstract
This study examines the translation and rotation of a spherical colloid straddling the (upper) air/liquid interface of a thin, planar, liquid film bounded from below by either a solid or a gas/liquid interface. The goal is to obtain numerical solutions for the hydrodynamic flow in order to understand the influence of the film thickness and the lower interface boundary condition. When the colloid translates on a film above a solid, the viscous resistance increases significantly as the film thickness decreases due to the fluid-solid interaction, while on a free lamella, the drag decreases due to the proximity to the free (gas/liquid) surface. When the colloid rotates, the contact line of the interface moves relative to the colloid surface. If no-slip is assumed, the stress becomes infinite and prevents the rotation. Here finite slip is used to resolve the singularity, and for small values of the slip coefficient, the rotational viscous resistance is dominated by the contact line stress and is surprisingly less dependent on the film thickness and the lower interface boundary condition. For a colloid rotating on a semi-infinite liquid layer, the rotational resistance is largest when the colloid just breaches the interface from the liquid side.
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Affiliation(s)
- Subhabrata Das
- Columbia University, Langmuir Center of Colloids and Interfaces, New York, 10025, USA
| | - Joel Koplik
- City College of The City University of New York, Levich Institute and Department of Physics, New York, 10027, USA
| | | | | | - Charles Maldarelli
- City College of The City University of New York, Levich Institute and Department of Chemical Engineering, New York, 10027, USA
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24
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Kaptay G. The chemical (not mechanical) paradigm of thermodynamics of colloid and interface science. Adv Colloid Interface Sci 2018; 256:163-192. [PMID: 29705027 DOI: 10.1016/j.cis.2018.04.007] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2017] [Revised: 03/25/2018] [Accepted: 04/09/2018] [Indexed: 12/22/2022]
Abstract
In the most influential monograph on colloid and interfacial science by Adamson three fundamental equations of "physical chemistry of surfaces" are identified: the Laplace equation, the Kelvin equation and the Gibbs adsorption equation, with a mechanical definition of surface tension by Young as a starting point. Three of them (Young, Laplace and Kelvin) are called here the "mechanical paradigm". In contrary it is shown here that there is only one fundamental equation of the thermodynamics of colloid and interface science and all the above (and other) equations of this field follow as its derivatives. This equation is due to chemical thermodynamics of Gibbs, called here the "chemical paradigm", leading to the definition of surface tension and to 5 rows of equations (see Graphical abstract). The first row is the general equation for interfacial forces, leading to the Young equation, to the Bakker equation and to the Laplace equation, etc. Although the principally wrong extension of the Laplace equation formally leads to the Kelvin equation, using the chemical paradigm it becomes clear that the Kelvin equation is generally incorrect, although it provides right results in special cases. The second row of equations provides equilibrium shapes and positions of phases, including sessile drops of Young, crystals of Wulff, liquids in capillaries, etc. The third row of equations leads to the size-dependent equations of molar Gibbs energies of nano-phases and chemical potentials of their components; from here the corrected versions of the Kelvin equation and its derivatives (the Gibbs-Thomson equation and the Freundlich-Ostwald equation) are derived, including equations for more complex problems. The fourth row of equations is the nucleation theory of Gibbs, also contradicting the Kelvin equation. The fifth row of equations is the adsorption equation of Gibbs, and also the definition of the partial surface tension, leading to the Butler equation and to its derivatives, including the Langmuir equation and the Szyszkowski equation. Positioning the single fundamental equation of Gibbs into the thermodynamic origin of colloid and interface science leads to a coherent set of correct equations of this field. The same provides the chemical (not mechanical) foundation of the chemical (not mechanical) discipline of colloid and interface science.
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Fei Y, Zhu J, Xu B, Li X, Gonzalez M, Haghighi M. Experimental investigation of nanotechnology on worm-like micelles for high-temperature foam stimulation. J IND ENG CHEM 2017. [DOI: 10.1016/j.jiec.2017.02.015] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Cui X, Shi C, Zhang S, Xie L, Liu J, Jiang D, Zeng H. Probing the Effect of Salinity and pH on Surface Interactions between Air Bubbles and Hydrophobic Solids: Implications for Colloidal Assembly at Air/Water Interfaces. Chem Asian J 2017; 12:1568-1577. [DOI: 10.1002/asia.201700388] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2017] [Revised: 03/31/2017] [Indexed: 11/10/2022]
Affiliation(s)
- Xin Cui
- Department of Chemical and Materials Engineering; University of Alberta; Edmonton Alberta T6G 1H9 Canada
| | - Chen Shi
- Department of Chemical and Materials Engineering; University of Alberta; Edmonton Alberta T6G 1H9 Canada
| | - Shuo Zhang
- Department of Chemical and Materials Engineering; University of Alberta; Edmonton Alberta T6G 1H9 Canada
| | - Lei Xie
- Department of Chemical and Materials Engineering; University of Alberta; Edmonton Alberta T6G 1H9 Canada
| | - Jing Liu
- Department of Chemical and Materials Engineering; University of Alberta; Edmonton Alberta T6G 1H9 Canada
| | - Dazhi Jiang
- Department of Materials and Engineering; National University of Defence Technology; Changsha 410073 P.R. China
| | - Hongbo Zeng
- Department of Chemical and Materials Engineering; University of Alberta; Edmonton Alberta T6G 1H9 Canada
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Kaptay G. A new paradigm on the chemical potentials of components in multi-component nano-phases within multi-phase systems. RSC Adv 2017. [DOI: 10.1039/c7ra07911g] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
A new paradigm is offered claiming that the thermodynamic nano-effect in multi-component and multiphase systems is proportional to the increased surface areas of the phases and not to their increased curvatures (as the Kelvin paradigm claims).
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Affiliation(s)
- George Kaptay
- University of Miskolc
- Department of Nanotechnology
- Miskolc
- 3525 Hungary
- MTA-ME Materials Science Research Group
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28
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Controlling Pickering Emulsion Destabilisation: A Route to Fabricating New Materials by Phase Inversion. MATERIALS 2016; 9:ma9080626. [PMID: 28773747 PMCID: PMC5509044 DOI: 10.3390/ma9080626] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Revised: 07/22/2016] [Accepted: 07/22/2016] [Indexed: 11/30/2022]
Abstract
The aim of this paper is to review the key findings about how particle-stabilised (or Pickering) emulsions respond to stress and break down. Over the last ten years, new insights have been gained into how particles attached to droplet (and bubble) surfaces alter the destabilisation mechanisms in emulsions. The conditions under which chemical demulsifiers displace, or detach, particles from the interface were established. Mass transfer between drops and the continuous phase was shown to disrupt the layers of particles attached to drop surfaces. The criteria for causing coalescence by applying physical stress (shear or compression) to Pickering emulsions were characterised. These findings are being used to design the structures of materials formed by breaking Pickering emulsions.
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Bournival G, Ata S, Wanless EJ. Behavior of Bubble Interfaces Stabilized by Particles of Different Densities. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:6226-6238. [PMID: 27223404 DOI: 10.1021/acs.langmuir.6b00656] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Stability of bubbles laden with particles of different densities was investigated. Capillary-held bubbles were produced and coated with particles across the density range of 1.2-3.6 g·cm(-3). The materials used were poly(methyl methacrylate) (PMMA), glass, and anatase. The interaction of the bubbles, once brought into contact, was monitored using high-speed video recording. Visual inspection indicated that denser particles were more easily displaced during the contact of the bubbles and therefore the PMMA particles provided a particle barrier more resistant to coalescence. The coalescence events yielded information on the surface properties of the bubble and the detachment of particles. The attached particles commonly dampen the oscillation of the coalesced bubbles through viscous drag and change in the surface properties (e.g., area-exclusion principle). The dampening of the oscillation generally leads to a reduced mass of particles detaching from the bubble surface. It was found that the different materials investigated did not offer clear evidence of the effect of particle detachment on the bubble surface properties in the present systems. On the other hand, the detachment of different particle materials seemed to be consistent with one another when comparing the attachment and detachment forces exerted on the particles based on their density, size, and hydrophobicity. It was concluded that particles of lower density are more effective in stabilizing interfaces, and thus particle density is an important parameter in the selection of materials for the handling of dispersions.
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Affiliation(s)
- Ghislain Bournival
- The School of Mining Engineering, The University of New South Wales , Sydney, New South Wales 2052, Australia
| | - Seher Ata
- The School of Mining Engineering, The University of New South Wales , Sydney, New South Wales 2052, Australia
| | - Erica J Wanless
- Priority Research Centre for Advanced Particle Processing and Transport, The University of Newcastle , Callaghan, New South Wales 2308, Australia
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30
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Effect of dispersed particles on instant coffee foam stability and rheological properties. Eur Food Res Technol 2016. [DOI: 10.1007/s00217-016-2728-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Wang J, Nguyen AV. Foam drainage in the presence of solid particles. SOFT MATTER 2016; 12:3004-3012. [PMID: 26877265 DOI: 10.1039/c6sm00028b] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We conducted forced drainage experiments to study the liquid flow within the foams stabilized by a cationic surfactant (CTAB) in the presence of partially hydrophobic silica particles. The results show that the presence of solid particles, even when present in small amounts (0.0932 g L(-1) foam), can significantly decrease the foam permeability. The scaling behaviour (power law) between the drainage velocity and the imposed flow rate indicates that the presence of solid particles in the foams triggers a transition of the foam drainage regime from a node-dominated regime to a Plateau border-dominated regime. We applied two foam drainage equations for aqueous foams to simulate the experimental data and interpret the transition. The simulation results show that the presence of solid particles in the foams increases the rigidity of the interfaces and the viscous losses in the channels (the Plateau borders) of the foams, and decreases the foam permeability. We also generalize the theory for the effects of unattached hydrophilic particles on foam drainage by considering the effects of hydrophobicity and concentration of solid particles on the confinement of foam networks. This study explores liquid drainage in three-phase foams and is relevant to the field of hydrophobic particle separation by froth flotation, in which the wash water is commonly applied to the froth layer to improve the product grade.
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Affiliation(s)
- J Wang
- School of Chemical Engineering, The University of Queensland, Brisbane, Queensland 4072, Australia.
| | - A V Nguyen
- School of Chemical Engineering, The University of Queensland, Brisbane, Queensland 4072, Australia.
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Gu C, Botto L. Direct calculation of anisotropic surface stresses during deformation of a particle-covered drop. SOFT MATTER 2016; 12:705-716. [PMID: 26559077 DOI: 10.1039/c5sm02374b] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The modification of the surface tension and the surface shear elasticity by particles in particle-covered drops can be attributed to a particle-induced surface stress. This stress represents at the macroscopic, continuum level the microscopic effect of lateral particle-particle interactions. Understanding the link between the isotropic and anisotropic components of the surface stress and the particle microstructure, and how these components change when structured interfaces deform, is a crucial problem in the field of particle-laden interfaces. In this paper, we analyse static and transient three-dimensional simulations of a pendant drop whose surface is covered by colloidal particles displaying purely repulsive particle-particle interactions. We compute the isotropic and anisotropic surface stress from the inter-particle forces using a version of the Kirkwood-Irving formula suitable for interfacial suspensions; we validate the approach by comparing against surface tension values obtained using Fordham's method (Proc. R. Soc. London, Ser. A, 1948, 194). In the parameter range simulated, the combination of parameters for which the drop does not pinch off (stable drop) gives rise to a homogeneous and isotropic surface stress; we argue that in the absence of attractive interactions the drop becomes unstable before anisotropic effects can manifest themselves. For unstable drops, stress non-uniformity and anisotropy are significant when the drop deformation and the solid area fraction are sufficiently large. Our results have implications for the dynamic deformation of structured interfaces with geometrically complex and time dependent morphologies.
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Affiliation(s)
- Chuan Gu
- School of Engineering and Materials Science, Queen Mary University of London, E1 4NS, London, UK.
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