1
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Ji S, Ran R, Esfahani IC, Sun H, Wan KT. Quantification of Particle Filtration Using a Quartz Crystal Microbalance Embedded in a Microfluidic Channel. Langmuir 2023; 39:14223-14230. [PMID: 37753720 PMCID: PMC10620986 DOI: 10.1021/acs.langmuir.3c01331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Revised: 08/28/2023] [Indexed: 09/28/2023]
Abstract
To quantify colloidal filtration, a quartz crystal microbalance (QCM) with a silicon dioxide surface is embedded on the inner surface of a microfluidic channel to monitor the real-time particle deposition. Potassium chloride solution with micrometer-size polystyrene particles simulating bacterial strains flows down the channel. In the presence of intrinsic Derjaguin-Landau-Verwey-Overbeek (DLVO) intersurface forces, particles are trapped by the quartz surfaces, and the increased mass shifts the QCM resonance frequency. The method provides an alternative way to measure filtration efficiency in an optically opaque channel and its dependence on the ionic concentration.
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Affiliation(s)
- Siqi Ji
- Mechanical and Industrial
Engineering, Northeastern University, Boston, Massachusetts 02115-5005, United
States
| | - Ran Ran
- Mechanical and Industrial
Engineering, Northeastern University, Boston, Massachusetts 02115-5005, United
States
| | | | - Hongwei Sun
- Mechanical and Industrial
Engineering, Northeastern University, Boston, Massachusetts 02115-5005, United
States
| | - Kai-tak Wan
- Mechanical and Industrial
Engineering, Northeastern University, Boston, Massachusetts 02115-5005, United
States
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2
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Millan E, Lavaud M, Amarouchene Y, Salez T. Numerical simulations of confined Brownian-yet-non-Gaussian motion. Eur Phys J E Soft Matter 2023; 46:24. [PMID: 37002415 DOI: 10.1140/epje/s10189-023-00281-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Accepted: 03/20/2023] [Indexed: 06/19/2023]
Abstract
Brownian motion is a central scientific paradigm. Recently, due to increasing efforts and interests towards miniaturization and small-scale physics or biology, the effects of confinement on such a motion have become a key topic of investigation. Essentially, when confined near a wall, a particle moves much slower than in the bulk due to friction at the boundaries. The mobility is therefore locally hindered and space-dependent, which in turn leads to the apparition of so-called multiplicative noises, and associated non-Gaussianities which remain difficult to resolve at all times. Here, we exploit simple, optimized and efficient numerical simulations to address Brownian motion in confinement in a broadrange and quantitative way. To do so, we integrate the overdamped Langevin equation governing the thermal dynamics of a negatively-buoyant single spherical colloid within a viscous fluid confined by two rigid walls, including surface charges. From the produced large set of long random trajectories, we perform a complete statistical analysis and extract all the key quantities, such as the probability distributions in displacements and their main moments. In particular, we propose a novel method to compute high-order cumulants by reducing convergence problems, and employ it to efficiently characterize the inherent non-Gaussianity of the confined process.
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Affiliation(s)
- Elodie Millan
- Univ. Bordeaux, CNRS, LOMA, UMR 5798, 33400, Talence, France
| | - Maxime Lavaud
- Univ. Bordeaux, CNRS, LOMA, UMR 5798, 33400, Talence, France
| | | | - Thomas Salez
- Univ. Bordeaux, CNRS, LOMA, UMR 5798, 33400, Talence, France.
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3
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Besenhard MO, Pal S, Gkogkos G, Gavriilidis A. Non-fouling flow reactors for nanomaterial synthesis. REACT CHEM ENG 2023. [DOI: 10.1039/d2re00412g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
This review provides a holistic description of flow reactor fouling for wet-chemical nanomaterial syntheses. Fouling origins and consequences are discussed together with the variety of flow reactors for its prevention.
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Affiliation(s)
| | - Sayan Pal
- Department of Chemical Engineering, University College London, London, WC1E 7JE, UK
| | - Georgios Gkogkos
- Department of Chemical Engineering, University College London, London, WC1E 7JE, UK
| | - Asterios Gavriilidis
- Department of Chemical Engineering, University College London, London, WC1E 7JE, UK
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4
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Abstract
Clogging is a common obstacle encountered during the transport of suspensions and represents a significant energy and material cost across applications, including water purification, irrigation, biopharmaceutical processing, and aquifer recharge. Pulsatile pressure-driven flows can help mitigate clogging when compared to steady flows. Here, we study experimentally the influence of the amplitude of pulsation 0.25P0 ≤ δP ≤ 1.25P0, where P0 is the mean pressure, and of the frequency of pulsation 10-3 Hz ≤ f ≤ 10-1 Hz on clog mitigation in a microfluidic array of parallel channels using a dilute suspension of colloidal particles. The array geometry is representative of a classical filter, with parallel pores that clog over time, yielding a filter cake that continues to grow and can interact with other pores. We combine flow rate measurements with direct visualizations at the pore scale to correlate the observed clogging dynamics with the changes in flow rate. We observe that all pulsatile amplitudes at 0.1 Hz yield increased throughput compared to steady flows. The rearrangement of particles when subject to a dynamic shear environment can delay the clogging of a pore or even remove an existing clog. However, this benefit is drastically reduced at 10-2 Hz and disappears at 10-3 Hz as the pulsatile timescale becomes too large compared to the timescale associated with the clogging and the growth of the filter cakes in this system. The present study demonstrates that pulsatile flows are a promising method to delay clogging at both the pore and system scale.
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Affiliation(s)
- Brian Dincau
- Department of Mechanical Engineering, University of California, Santa Barbara, California 93106, USA.
| | - Connor Tang
- Department of Mechanical Engineering, University of California, Santa Barbara, California 93106, USA.
| | - Emilie Dressaire
- Department of Mechanical Engineering, University of California, Santa Barbara, California 93106, USA.
| | - Alban Sauret
- Department of Mechanical Engineering, University of California, Santa Barbara, California 93106, USA.
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5
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Prakash P, Abdulla AZ, Varma M. Contact Force Mediated Rapid Deposition of Colloidal Microspheres Flowing over Microstructured Barriers. Langmuir 2021; 37:6915-6922. [PMID: 34076447 DOI: 10.1021/acs.langmuir.1c00370] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Deposition of particles while flowing past constrictions is a ubiquitous phenomenon observed in diverse systems. Some common examples are jamming of salt crystals near the orifice of salt shakers, clogging of filter systems, gridlock in vehicular traffic, etc. Our work investigates the deposition events of colloidal microspheres flowing over microstructured barriers in microfluidic devices. The interplay of DLVO, contact, and hydrodynamic forces in facilitating rapid deposition of microspheres is discussed. Noticeably, a decrease in the electrostatic repulsion among microspheres leads to linear chain formations, whereas an increase in roughness results in rapid deposition.
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Affiliation(s)
- P Prakash
- Centre for Nanoscience and Engineering, Indian Institute of Science, Bangalore 560012, India
| | - A Z Abdulla
- Department of Physics, Indian Institute of Science, Bangalore 560012, India
| | - M Varma
- Centre for Nanoscience and Engineering, Indian Institute of Science, Bangalore 560012, India
- Robert Bosch Centre for Cyber Physical Systems, Indian Institute of Science, Bangalore 560012, India
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6
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Porto Santos T, Cejas CM, Cunha RL, Tabeling P. Unraveling driving regimes for destabilizing concentrated emulsions within microchannels. Soft Matter 2021; 17:1821-1833. [PMID: 33399611 DOI: 10.1039/d0sm01674h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Coalescence is the most widely demonstrated mechanism for destabilizing emulsion droplets in microfluidic chambers. However, we find that depending on the channel wall surface functionalization, surface zeta potential, type of surfactant, characteristics of the oil as a dispersed phase, or even the presence of externally-induced stress, other different destabilization mechanisms can occur in subtle ways. In general, we observe four regimes leading to destabilization of concentrated emulsions: (i) coalescence, (ii) emulsion bursts, (iii) a combination of the two first mechanisms, attributed to the simultaneous occurrence of coalescence and emulsion bursts; and (iv) compaction of the droplet network that eventually destabilizes to fracture-like behavior. We correlate various physico-chemical properties (zeta potential, contact angle, interfacial tension) to understand their respective influence on the destabilization mechanisms. This work provides insights into possible ways to control or inflict emulsion droplet destabilization for different applications.
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Affiliation(s)
- Tatiana Porto Santos
- Department of Food Engineering, Faculty of Food Engineering, University of Campinas, Rua Monteiro Lobato, 80-CEP 13083-862 Campinas, Brazil. and Microfluidics, MEMS, Nanostructures Laboratory, CNRS Chimie Biologie Innovation (CBI) UMR 8231, Institut Pierre Gilles de Gennes (IPGG), ESPCI Paris, PSL Research University, 6 rue Jean Calvin 75005, Paris, France.
| | - Cesare M Cejas
- Microfluidics, MEMS, Nanostructures Laboratory, CNRS Chimie Biologie Innovation (CBI) UMR 8231, Institut Pierre Gilles de Gennes (IPGG), ESPCI Paris, PSL Research University, 6 rue Jean Calvin 75005, Paris, France.
| | - Rosiane Lopes Cunha
- Department of Food Engineering, Faculty of Food Engineering, University of Campinas, Rua Monteiro Lobato, 80-CEP 13083-862 Campinas, Brazil.
| | - Patrick Tabeling
- Microfluidics, MEMS, Nanostructures Laboratory, CNRS Chimie Biologie Innovation (CBI) UMR 8231, Institut Pierre Gilles de Gennes (IPGG), ESPCI Paris, PSL Research University, 6 rue Jean Calvin 75005, Paris, France.
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7
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Abstract
The flow of a suspension through a bottleneck often leads to its obstruction. Such a continuous flow to clogging transition has been well characterized when the constriction width to particle size ratio, W/D, is smaller than 3-4. In such cases, the constriction is either blocked by a single particle that is larger than the constriction width (W/D < 1), or there is an arch formed by several particles that try to enter it together (2 < W/D < 4). For larger W/D ratios, 4 < W/D < 10, the blockage of the constriction is presumed to be due to the successive accumulations of particles. Such a clogging mechanism may also apply to wider pores. The dynamics of this progressive obstruction remains largely unexplored since it is difficult to see through the forming clog and we still do not know how particles accumulate inside the constriction. In this paper, we use particle tracking and image analysis to study the clogging of a constriction/pore by stable colloidal particles. These techniques allow us to determine the shape and the size of all the objects, be they single particles or aggregates, captured inside the pore. We show that even with the rather monodisperse colloidal suspension we used individual particles cannot clog a pore alone. These individual particles can only partially cover the pore surface whilst it is the very small fraction of aggregates present in the suspension that can pile up and clog the pore. We analyzed the dynamics of aggregate motion up to the point of capture within the pore, which helps us to elucidate why the probability of aggregate capture inside the pore is high.
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Affiliation(s)
- N Delouche
- Univ Rennes, CNRS, IPR (Institut de Physique de Rennes)-UMR 6251, F-35000 Rennes, France.
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8
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Mokrane ML, Desclaux T, Morris JF, Joseph P, Liot O. Microstructure of the near-wall layer of filtration-induced colloidal assembly. Soft Matter 2020; 16:9726-9737. [PMID: 32996535 DOI: 10.1039/d0sm01143f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
This paper describes an experimental study of filtration of a colloidal suspension using microfluidic devices. A suspension of micrometer-scale colloids flows through parallel slit-shaped pores at fixed pressure drop. Clogs and cakes are systematically observed at pore entrance, for variable applied pressure drop and ionic strength. Based on image analysis of the layer of colloids close to the device wall, global and local studies are performed to analyse in detail the near-wall layer microstructure. Whereas global porosity of this layer does not seem to be affected by ionic strength and applied pressure drop, a local study shows some heterogeneity: clogs are more porous at the vicinity of the pore than far away. An analysis of medium-range order using radial distribution function shows a slightly more organized state at high ionic strength. This is confirmed by a local analysis using two-dimension continuous wavelet decomposition: the typical size of crystals of colloids is larger for low ionic strength, and it increases with distance from the pores. We bring these results together in a phase diagram involving colloid-colloid repulsive interactions and fluid velocity.
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Affiliation(s)
- Mohand Larbi Mokrane
- Institut de Mécanique des Fluides de Toulouse, Université de Toulouse, CNRS, Toulouse, France.
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9
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Bouhid de Aguiar I, Schroën K. Microfluidics Used as a Tool to Understand and Optimize Membrane Filtration Processes. Membranes (Basel) 2020; 10:E316. [PMID: 33138236 PMCID: PMC7692330 DOI: 10.3390/membranes10110316] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Revised: 10/27/2020] [Accepted: 10/28/2020] [Indexed: 12/13/2022]
Abstract
Membrane filtration processes are best known for their application in the water, oil, and gas sectors, but also in food production they play an eminent role. Filtration processes are known to suffer from a decrease in efficiency in time due to e.g., particle deposition, also known as fouling and pore blocking. Although these processes are not very well understood at a small scale, smart engineering approaches have been used to keep membrane processes running. Microfluidic devices have been increasingly applied to study membrane filtration processes and accommodate observation and understanding of the filtration process at different scales, from nanometer to millimeter and more. In combination with microscopes and high-speed imaging, microfluidic devices allow real time observation of filtration processes. In this review we will give a general introduction on microfluidic devices used to study membrane filtration behavior, followed by a discussion of how microfluidic devices can be used to understand current challenges. We will then discuss how increased knowledge on fundamental aspects of membrane filtration can help optimize existing processes, before wrapping up with an outlook on future prospects on the use of microfluidics within the field of membrane separation.
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Affiliation(s)
- Izabella Bouhid de Aguiar
- Membrane Science and Technology—Membrane Processes for Food, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands;
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10
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Souzy M, Zuriguel I, Marin A. Transition from clogging to continuous flow in constricted particle suspensions. Phys Rev E 2020; 101:060901. [PMID: 32688531 DOI: 10.1103/physreve.101.060901] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Accepted: 05/25/2020] [Indexed: 06/11/2023]
Abstract
When suspended particles are pushed by liquid flow through a constricted channel, they might either pass the bottleneck without trouble or encounter a permanent clog that will stop them forever. However, they may also flow intermittently with great sensitivity to the neck-to-particle size ratio D/d. In this Rapid Communication, we experimentally explore the limits of the intermittent regime for a dense suspension through a single bottleneck as a function of this parameter. To this end, we make use of high time- and space-resolution experiments to obtain the distributions of arrest times (T) between successive bursts, which display power-law tails (∝T^{-α}) with characteristic exponents. These exponents compare well with the ones found for as disparate situations as the evacuation of pedestrians from a room, the entry of a flock of sheep into a shed, or the discharge of particles from a silo. Nevertheless, the intrinsic properties of our system (i.e., channel geometry, driving and interaction forces, particle size distribution) seem to introduce a sharp transition from a clogged state (α≤2) to a continuous flow, where clogs do not develop at all. This contrasts with the results obtained in other systems where intermittent flow, with power-law exponents above two, were obtained.
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Affiliation(s)
- Mathieu Souzy
- Physics of Fluids, University of Twente, Enschede, The Netherlands
| | - Iker Zuriguel
- Departamento de Física, Facultad de Ciencias, Universidad de Navarra, Pamplona, Spain
| | - Alvaro Marin
- Physics of Fluids, University of Twente, Enschede, The Netherlands
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11
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Yan Z, Huang X, Shui L, Yang C. Kinetics of colloidal particle deposition in microfluidic systems under temperature gradients: experiment and modelling. Soft Matter 2020; 16:3649-3656. [PMID: 32202268 DOI: 10.1039/c9sm02102g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The deposition of colloidal particles can cause particulate fouling on solid walls and the formation of clogs during the transport of colloidal suspensions in microchannels. The particle deposition rate grows over time and blocks the microchannels eventually. The process of particle deposition is affected by various physicochemical parameters. In this paper, we investigate the effect of temperature gradient on the particle deposition of a pressure-driven suspension flow in a microchannel. We designed a microfluidic device which can allow direct observation of the real-time process of particle deposition with single-particle resolution along the direction of applied temperature gradient. The experimental results show that particle deposition rate is decreased by increasing the applied temperature gradients. Based on the framework of the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory, we then derive a mass transport model to describe the particle deposition under different temperature gradients. The model shows that the observed reduction of particle deposition rate with temperature gradient is due to the collective effect of the temperature gradient and the bulk solution temperature in the two steps of the particle deposition process, including the particle transport and the particle attachment. Our work illustrates the critical effects of temperature gradients on the particle deposition in microchannels, and is expected to provide a better understanding of thermally driven particulate fouling and clogging in microfluidic devices.
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Affiliation(s)
- Zhibin Yan
- National Center for International Research on Green Optoelectronics, South China Normal University, Guangzhou 510006, China. and Guangdong Provincial Key Laboratory of Optical Information Materials and Technology, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China
| | - Xiaoyang Huang
- School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore
| | - Lingling Shui
- National Center for International Research on Green Optoelectronics, South China Normal University, Guangzhou 510006, China. and Guangdong Provincial Key Laboratory of Optical Information Materials and Technology, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China and School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China
| | - Chun Yang
- School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore
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12
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Duchêne C, Filipe V, Huille S, Lindner A. Clogging of microfluidic constrictions by monoclonal antibody aggregates: role of aggregate shape and deformability. Soft Matter 2020; 16:921-928. [PMID: 31813947 DOI: 10.1039/c9sm01583c] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The formation of aggregates in solutions of monoclonal antibodies is difficult to prevent. Even if the occurrence of large aggregates is rare, their existence can lead to partial or total clogging of constrictions in injection devices, with drastic effects on drug delivery. Little is known on the origin and characteristics of such clogging events. Here we investigate a microfluidic model system to gain fundamental understanding of the clogging of constrictions by monoclonal antibody aggregates. Highly concentrated solutions of monoclonal antibodies were used to create protein aggregates (larger than 50 microns) using mechanical or heat stress. We show that clogging occurs when aggregates reach the size of the constriction and that clogs can in some cases be released by increasing the applied pressure. This indicates the important role of protein aggregate deformability. We perform systematic experiments for different relative aggregate sizes and applied pressures, and measure the resulting flow-rate. This allows us to present first in situ estimates of an effective Young's modulus. Despite their different shapes and densities, we can predict the number of clogging events for a given constriction size from the aggregate size distribution measured by Flow Imaging Microscopy (MFI). In addition our device can detect the occurrence of very rare big aggregates often overlooked by other detection methods.
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Affiliation(s)
- Charles Duchêne
- PMMH, CNRS, ESPCI Paris, PSL University, Sorbonne Université, Université de Paris, F-75005, Paris, France.
| | - Vasco Filipe
- Sanofi Biopharmaceutics Development, Impasse des Ateliers, 94400 Vitry-sur-Seine, France
| | - Sylvain Huille
- Sanofi Biopharmaceutics Development, Impasse des Ateliers, 94400 Vitry-sur-Seine, France
| | - Anke Lindner
- PMMH, CNRS, ESPCI Paris, PSL University, Sorbonne Université, Université de Paris, F-75005, Paris, France.
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13
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Porto Santos T, Cunha RL, Tabeling P, Cejas CM. Colloidal particle deposition on microchannel walls, for attractive and repulsive surface potentials. Phys Chem Chem Phys 2020; 22:17236-17246. [DOI: 10.1039/d0cp01999b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
When both surfaces possess opposite charges, particle deposition increases at low ionic strengths due to van der Waals forces assisted by electrostatic attraction.
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Affiliation(s)
- Tatiana Porto Santos
- Department of Food Engineering, Faculty of Food Engineering, University of Campinas, Rua Monteiro Lobato
- Brazil
- Microfluidics, MEMS
- Nanostructures Laboratory
- CNRS Chimie Biologie Innovation (CBI)
| | - Rosiane Lopes Cunha
- Department of Food Engineering, Faculty of Food Engineering, University of Campinas, Rua Monteiro Lobato
- Brazil
| | - Patrick Tabeling
- Microfluidics, MEMS
- Nanostructures Laboratory
- CNRS Chimie Biologie Innovation (CBI)
- UMR 8231
- Institut Pierre Gilles de Gennes (IPGG)
| | - Cesare M. Cejas
- Microfluidics, MEMS
- Nanostructures Laboratory
- CNRS Chimie Biologie Innovation (CBI)
- UMR 8231
- Institut Pierre Gilles de Gennes (IPGG)
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14
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Perazzo A, Sicignano L, Tomaiuolo G, Marotta R, Andreozzi R, Guido S. Tuning crystal structure in a micro-scale reactive flow. Chem Eng Sci 2019; 207:581-7. [DOI: 10.1016/j.ces.2019.06.060] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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15
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Cejas CM, Maini L, Monti F, Tabeling P. Deposition kinetics of bi- and tridisperse colloidal suspensions in microchannels under the van der Waals regime. Soft Matter 2019; 15:7438-7447. [PMID: 31502623 DOI: 10.1039/c9sm01098j] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We investigate the kinetics of irreversible adsorption under the van der Waals regime, i.e. weakly Brownian polydisperse colloidal suspensions injected into shallow microchannels at high ionic strengths, where each suspension is represented by populations of particles with different particle sizes. We find that each population size of the particle in the suspension can be treated independently using an analytical solution based on the advection-diffusion equation and that the distribution of the adsorbed particles along the channel axis behaves according to a power law. The experimental measurements agree with Langevin simulations and are well accounted for by theory valid in the van der Waals regime. Operating in the van der Waals regime permits the present study to confirm the use of microfluidics as an effective in situ method to measure the Hamaker constant of particles under aqueous conditions.
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Affiliation(s)
- Cesare M Cejas
- Microfluidics, MEMS, Nanostructures Laboratory, CNRS Chimie Biologie Innovation (CBI) UMR 8231, Institut Pierre Gilles de Gennes (IPGG), ESPCI Paris, PSL Research University, 6 rue Jean Calvin, 75005, Paris, France.
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16
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Abstract
Blockage of pores by particles is found in many processes, including filtration and oil extraction. We present filtration experiments through a linear array of ten channels with one dimension which is sub-micron, through which a dilute dispersion of Brownian polystyrene spheres flows under the action of a fixed pressure drop. The growth rate of a clog formed by particles at a pore entrance systematically increases with the number of already saturated (entirely clogged) pores, indicating that there is an interaction or “cross-talk” between the pores. This observation is interpreted based on a phenomenological model, stating that a diffusive redistribution of particles occurs along the membrane, from clogged to free pores. This one-dimensional model could be extended to two-dimensional membranes.
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Affiliation(s)
- Olivier Liot
- LAAS-CNRS, Université de Toulouse, CNRS, Toulouse, France. .,Fédération FERMaT, INP, Toulouse, France. .,Institut Lumière Matière, CNRS, Villeurbanne, France.
| | - Akash Singh
- LAAS-CNRS, Université de Toulouse, CNRS, Toulouse, France
| | - Patrice Bacchin
- Laboratoire de Génie Chimique, Université de Toulouse, CNRS, Toulouse, France
| | - Paul Duru
- Institut de Mécanique des Fluides de Toulouse, Université de Toulouse, CNRS, Toulouse, France
| | - Jeffrey F Morris
- Levich Institute and Chemical Engineering, CUNY City College of New York, New York, USA
| | - Pierre Joseph
- LAAS-CNRS, Université de Toulouse, CNRS, Toulouse, France
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