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Zeng L, Franks GV, Goudeli E. Aggregation and breakage dynamics of alumina particles under shear by coupled Computational Fluid Dynamics - Discrete Element Method. J Colloid Interface Sci 2024; 661:750-760. [PMID: 38325173 DOI: 10.1016/j.jcis.2024.01.210] [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: 09/28/2023] [Revised: 01/20/2024] [Accepted: 01/30/2024] [Indexed: 02/09/2024]
Abstract
HYPOTHESIS Shear affects simultaneous aggregation and fragmentation of fine particles. Understanding the effect of shear on the dynamics of particle aggregation and break-up is important to predict aggregate size and structure. It is hypothesized that there is a transition from pure breakage of large aggregates to regimes where restructuring and aggregation also play a role as aggregates become smaller. SIMULATIONS Here, aggregation and fragmentation dynamics of alumina particles are investigated under laminar shear flow using Discrete Element Method (DEM) coupled with Computational Fluid Dynamics (CFD). The effect of the shear rate on the aggregation and breakage rates is quantified accounting for particle-particle and particle-fluid interactions. FINDINGS High shear rates promote the formation of small, compact aggregates. The collision efficiency decreases with increasing shear rate following a power law for shear rates higher than 1250 s-1. The transition from the pure breakage limit to the region dominated by breakage and restructuring has been observed for the first time. The breakage rate decreases significantly as the transition occurs upon decreasing aggregate size. CFD-DEM-derived collision efficiency and breakage rate equations are proposed that can be readily employed in detailed population balance equation models for industrial particle process design.
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Affiliation(s)
- Lequan Zeng
- Department of Chemical Engineering, The University of Melbourne, Parkville, VIC 3010, Australia; ARC Centre of Excellence for Enabling Eco-efficient Beneficiation of Minerals, The University of Melbourne, Parkville, VIC 3010, Australia
| | - George V Franks
- Department of Chemical Engineering, The University of Melbourne, Parkville, VIC 3010, Australia; ARC Centre of Excellence for Enabling Eco-efficient Beneficiation of Minerals, The University of Melbourne, Parkville, VIC 3010, Australia
| | - Eirini Goudeli
- Department of Chemical Engineering, The University of Melbourne, Parkville, VIC 3010, Australia; ARC Centre of Excellence for Enabling Eco-efficient Beneficiation of Minerals, The University of Melbourne, Parkville, VIC 3010, Australia.
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Kämäräinen T, Kadota K, Tse JY, Uchiyama H, Oguchi T, Arima-Osonoi H, Tozuka Y. Tuning the Phytoglycogen Size and Aggregate Structure with Solvent Quality: Influence of Water-Ethanol Mixtures Revealed by X-ray and Light Scattering Techniques. Biomacromolecules 2023; 24:225-237. [PMID: 36484419 DOI: 10.1021/acs.biomac.2c01093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Phytoglycogen (PG) is a hyperbranched polysaccharide with promising properties for biomedical and pharmaceutical applications. Herein, we explore the size and structure of sweet corn PG nanoparticles and their aggregation in water-ethanol mixtures up to the ethanol mole fraction xEtOH = 0.364 in dilute concentrations using small-angle X-ray scattering (SAXS) and dynamic light scattering (DLS) measurements. Between 0 ≤ xEtOH ≤ 0.129, the conformation of PG contracts gradually decreasing up to ca. 80% in hydrodynamic volume, when measured shortly after ethanol addition. For equilibrated PG dispersions, SAXS suggests a lower PG volume decrease between 19 and 67% at the corresponding xEtOH range; however, the inflection point of the DLS volume contraction coincides with the onset of reduced colloidal stability observed with SAXS. Up to xEtOH = 0.201, the water-ethanol mixtures yield labile fractal and globular aggregates, as evidenced by their partial breakup under mild ultrasonic treatment, demonstrated by the decrease in their hydrodynamic size. Between 0.235 ≤ xEtOH ≤ 0.364, PG nanoparticles form larger, more cohesive globular aggregates that are less affected by ultrasonic shear forces.
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Affiliation(s)
- Tero Kämäräinen
- Department of Formulation Design and Pharmaceutical Technology, Osaka Medical and Pharmaceutical University, 4-20-1 Nasahara, Takatsuki, Osaka569-1094, Japan
| | - Kazunori Kadota
- Department of Formulation Design and Pharmaceutical Technology, Osaka Medical and Pharmaceutical University, 4-20-1 Nasahara, Takatsuki, Osaka569-1094, Japan
| | - Jun Y Tse
- Department of Formulation Design and Pharmaceutical Technology, Osaka Medical and Pharmaceutical University, 4-20-1 Nasahara, Takatsuki, Osaka569-1094, Japan
| | - Hiromasa Uchiyama
- Department of Formulation Design and Pharmaceutical Technology, Osaka Medical and Pharmaceutical University, 4-20-1 Nasahara, Takatsuki, Osaka569-1094, Japan
| | - Toshio Oguchi
- Graduate School of Medicine, University of Yamanashi, 1110 Shimokato, Chuo, Yamanashi409-3898, Japan
| | - Hiroshi Arima-Osonoi
- Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society, Tokai, Ibaraki319-1106, Japan
| | - Yuichi Tozuka
- Department of Formulation Design and Pharmaceutical Technology, Osaka Medical and Pharmaceutical University, 4-20-1 Nasahara, Takatsuki, Osaka569-1094, Japan
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3
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Frungieri G, Boccardo G, Buffo A, Karimi–Varzaneh HA, Vanni M. CFD-DEM characterization and population balance modelling of a dispersive mixing process. Chem Eng Sci 2022. [DOI: 10.1016/j.ces.2022.117859] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Giuliano LV, Buffo A, Vanni M, Lanotte AS, Arima V, Bianco M, Baldassarre F, Frungieri G. Response of shear‐activated nanotherapeutic particles in a clot‐obstructed blood vessel by
CFD‐DEM
simulations. CAN J CHEM ENG 2022. [DOI: 10.1002/cjce.24502] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
| | - Antonio Buffo
- Department of Applied Science and Technology Politecnico di Torino Torino Italy
| | - Marco Vanni
- Department of Applied Science and Technology Politecnico di Torino Torino Italy
| | - Alessandra Sabina Lanotte
- CNR NANOTEC, Institute of Nanotechnology, Via Monteroni Lecce Italy
- INFN, Sez. Lecce, Via Monteroni Lecce Italy
| | - Valentina Arima
- CNR NANOTEC, Institute of Nanotechnology, Via Monteroni Lecce Italy
| | - Monica Bianco
- CNR NANOTEC, Institute of Nanotechnology, Via Monteroni Lecce Italy
| | - Francesca Baldassarre
- Dipartimento di Scienze e Tecnologie Biologiche e Ambientali Università del Salento & UdR INSTM Salento, via Monteroni Lecce Italy
| | - Graziano Frungieri
- Department of Applied Science and Technology Politecnico di Torino Torino Italy
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5
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Frungieri G, Vanni M. Aggregation and breakup of colloidal particle aggregates in shear flow: A combined Monte Carlo - Stokesian dynamics approach. POWDER TECHNOL 2021. [DOI: 10.1016/j.powtec.2021.04.076] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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6
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Frungieri G, Babler MU, Vanni M. Shear-Induced Heteroaggregation of Oppositely Charged Colloidal Particles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:10739-10749. [PMID: 32814425 PMCID: PMC8011919 DOI: 10.1021/acs.langmuir.0c01536] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
This paper investigates numerically the shear-induced aggregation of mixed populations of colloidal particles leading to the formation of clusters. Suspensions with different amounts of positively and negatively charged colloidal particles are simulated. To resolve the aggregation kinetics and structural properties of the formed clusters, we resort to a mixed deterministic-stochastic simulation method. The method is built on a combination of a Monte Carlo algorithm to sample a statistically expected sequence of encounter events between the suspended particles and a discrete element method built in the framework of Stokesian dynamics to simulate the encounters in a fully predictive manner. Results reveal a strong influence of the composition of the population on both the aggregation kinetics and the aggregate structure. In particular, we observe a size-stabilization phenomenon taking place in the suspension when the relative concentration of the majority particles lies in the range 80-85%; i.e., starting from primary particles, after a short growth period, we observed a cessation of aggregation. Inspection of the aggregate morphology shows that the formed clusters are composed of few minority particles placed in the inner region, while the aggregate surface is covered by majority particles, acting to provide a shielding effect against further growth.
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Affiliation(s)
- Graziano Frungieri
- Department of Applied
Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Turin, Italy
| | - Matthaus U. Babler
- Department of Chemical Engineering, KTH
Royal Institute of Technology, Teknikringen 42, SE-10044 Stockholm, Sweden
| | - Marco Vanni
- Department of Applied
Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Turin, Italy
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Bellot JP, Kroll-Rabotin JS, Gisselbrecht M, Joishi M, Saxena A, Sanders S, Jardy A. Toward Better Control of Inclusion Cleanliness in a Gas Stirred Ladle Using Multiscale Numerical Modeling. MATERIALS 2018; 11:ma11071179. [PMID: 29996521 PMCID: PMC6073398 DOI: 10.3390/ma11071179] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Revised: 06/29/2018] [Accepted: 07/05/2018] [Indexed: 11/16/2022]
Abstract
The industrial objective of lowering the mass of mechanical structures requires continuous improvement in controlling the mechanical properties of metallic materials. Steel cleanliness and especially control of inclusion size distribution have, therefore, become major challenges. Inclusions have a detrimental effect on fatigue that strongly depends both on inclusion content and on the size of the largest inclusions. Ladle treatment of liquid steel has long been recognized as the processing stage responsible for the inclusion of cleanliness. A multiscale modeling has been proposed to investigate the inclusion behavior. The evolution of the inclusion size distribution is simulated at the process scale due to coupling a computational fluid dynamics calculation with a population balance method integrating all mechanisms, i.e., flotation, aggregation, settling, and capture at the top layer. Particular attention has been paid to the aggregation mechanism and the simulations at an inclusion scale with fully resolved inclusions that represent hydrodynamic conditions of the ladle, which have been specifically developed. Simulations of an industrial-type ladle highlight that inclusion cleanliness is mainly ruled by aggregation. Quantitative knowledge of aggregation kinetics has been extracted and captured from mesoscale simulations. Aggregation efficiency has been observed to drop drastically when increasing the particle size ratio.
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Affiliation(s)
- Jean-Pierre Bellot
- Institut Jean Lamour-UMR 7198 CNRS/Université de Lorraine, CS 50840, 54011 Nancy CEDEX, France.
- Laboratory of Excellence on Design of Alloy Metals for low-mAss Structures (Labex DAMAS), Université de Lorraine, 57073 Metz, France.
| | - Jean-Sebastien Kroll-Rabotin
- Institut Jean Lamour-UMR 7198 CNRS/Université de Lorraine, CS 50840, 54011 Nancy CEDEX, France.
- Laboratory of Excellence on Design of Alloy Metals for low-mAss Structures (Labex DAMAS), Université de Lorraine, 57073 Metz, France.
| | - Matthieu Gisselbrecht
- Institut Jean Lamour-UMR 7198 CNRS/Université de Lorraine, CS 50840, 54011 Nancy CEDEX, France.
- Laboratory of Excellence on Design of Alloy Metals for low-mAss Structures (Labex DAMAS), Université de Lorraine, 57073 Metz, France.
| | - Manoj Joishi
- Institut Jean Lamour-UMR 7198 CNRS/Université de Lorraine, CS 50840, 54011 Nancy CEDEX, France.
- Laboratory of Excellence on Design of Alloy Metals for low-mAss Structures (Labex DAMAS), Université de Lorraine, 57073 Metz, France.
| | - Akash Saxena
- Department of Chemical & Materials Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada.
| | - Sean Sanders
- Department of Chemical & Materials Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada.
| | - Alain Jardy
- Institut Jean Lamour-UMR 7198 CNRS/Université de Lorraine, CS 50840, 54011 Nancy CEDEX, France.
- Laboratory of Excellence on Design of Alloy Metals for low-mAss Structures (Labex DAMAS), Université de Lorraine, 57073 Metz, France.
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Lazzari S, Nicoud L, Jaquet B, Lattuada M, Morbidelli M. Fractal-like structures in colloid science. Adv Colloid Interface Sci 2016; 235:1-13. [PMID: 27233526 DOI: 10.1016/j.cis.2016.05.002] [Citation(s) in RCA: 86] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2015] [Revised: 04/13/2016] [Accepted: 05/02/2016] [Indexed: 01/20/2023]
Abstract
The present work aims at reviewing our current understanding of fractal structures in the frame of colloid aggregation as well as the possibility they offer to produce novel structured materials. In particular, the existing techniques to measure and compute the fractal dimension df are critically discussed based on the cases of organic/inorganic particles and proteins. Then the aggregation conditions affecting df are thoroughly analyzed, pointing out the most recent literature findings and the limitations of our current understanding. Finally, the importance of the fractal dimension in applications is discussed along with possible directions for the production of new structured materials.
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Affiliation(s)
- S Lazzari
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77, Massachusetts Avenue, Cambridge, MA 02139, USA
| | - L Nicoud
- Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zurich, Vladimir-Prelog-Weg 1, 8093 Zurich, Switzerland
| | - B Jaquet
- Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zurich, Vladimir-Prelog-Weg 1, 8093 Zurich, Switzerland
| | - M Lattuada
- Adolphe Merkle Institute, University of Fribourg,, Chemin des Verdiers 4, 1700 Fribourg, Switzerland
| | - M Morbidelli
- Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zurich, Vladimir-Prelog-Weg 1, 8093 Zurich, Switzerland.
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Harshe YM, Lattuada M. Universal Breakup of Colloidal Clusters in Simple Shear Flow. J Phys Chem B 2016; 120:7244-52. [DOI: 10.1021/acs.jpcb.6b03220] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yogesh M. Harshe
- Nestlé Research Center, Vers-chez-les-Blanc, CH-1000 Lausanne 26, Switzerland
| | - Marco Lattuada
- Adolphe
Merkle Institute, University of Fribourg, Chemin des Verdiers 4, CH-1700 Fribourg, Switzerland
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10
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Saha D, Babler MU, Holzner M, Soos M, Lüthi B, Liberzon A, Kinzelbach W. Breakup of Finite-Size Colloidal Aggregates in Turbulent Flow Investigated by Three-Dimensional (3D) Particle Tracking Velocimetry. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:55-65. [PMID: 26646289 DOI: 10.1021/acs.langmuir.5b03804] [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
Aggregates grown in mild shear flow are released, one at a time, into homogeneous isotropic turbulence, where their motion and intermittent breakup is recorded by three-dimensional particle tracking velocimetry (3D-PTV). The aggregates have an open structure with a fractal dimension of ∼2.2, and their size is 1.4 ± 0.4 mm, which is large, compared to the Kolmogorov length scale (η = 0.15 mm). 3D-PTV of flow tracers allows for the simultaneous measurement of aggregate trajectories and the full velocity gradient tensor along their pathlines, which enables us to access the Lagrangian stress history of individual breakup events. From this data, we found no consistent pattern that relates breakup to the local flow properties at the point of breakup. Also, the correlation between the aggregate size and both shear stress and normal stress at the location of breakage is found to be weaker, when compared with the correlation between size and drag stress. The analysis suggests that the aggregates are mostly broken due to the accumulation of the drag stress over a time lag on the order of the Kolmogorov time scale. This finding is explained by the fact that the aggregates are large, which gives their motion inertia and increases the time for stress propagation inside the aggregate. Furthermore, it is found that the scaling of the largest fragment and the accumulated stress at breakup follows an earlier established power law, i.e., dfrag ∼ σ(-0.6) obtained from laminar nozzle experiments. This indicates that, despite the large size and the different type of hydrodynamic stress, the microscopic mechanism causing breakup is consistent over a wide range of aggregate size and stress magnitude.
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Affiliation(s)
- Debashish Saha
- Department of Applied Physics, Eindhoven University of Technology , 5600 MB, Eindhoven, The Netherlands
| | - Matthaus U Babler
- Department of Chemical Engineering and Technology, KTH Royal Institute of Technology , SE-10044 Stockholm, Sweden
| | - Markus Holzner
- Environmental Fluid Mechanics, Institute of Environmental Engineering, ETH Zurich , 8093 Zurich, Switzerland
| | - Miroslav Soos
- Faculty of Chemical Engineering, Department of Chemical Engineering, University of Chemistry and Technology Prague , Technicka 3, 166 28 Praha 6-Dejvice, Czech Republic
| | - Beat Lüthi
- Photrack AG, Ankerstr. 16a, 8004, Zurich, Switzerland
| | - Alex Liberzon
- School of Mechanical Engineering, Tel Aviv University , Tel Aviv 69978, Israel
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