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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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Hydrodynamic interactions between charged and uncharged Brownian colloids at a fluid-fluid interface. J Colloid Interface Sci 2022; 628:931-945. [PMID: 36037716 DOI: 10.1016/j.jcis.2022.08.084] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Revised: 08/11/2022] [Accepted: 08/12/2022] [Indexed: 11/24/2022]
Abstract
HYPOTHESIS The cluster formation and self-assembly of floating colloids at a fluid/fluid interface is a delicate force balance involving deterministic lateral interaction forces, viscous resistance to relative colloid motion along the surface and thermal (Brownian) fluctuations. As the colloid dimensions get smaller, thermal forces and associated drag forces become important and can affect the self assembly into ordered patterns and crystal structures that are the starting point for various materials applications. NUMERICS Langevin dynamic simulations for particle pairs straddling a liquid-liquid interface with a high viscosity contrast are presented to describe the lateral interfacial assembly of particles in Brownian and non-Brownian dominated regimes. These simulations incorporate capillary attraction, electrostatic repulsion, thermal fluctuations and hydrodynamic interactions (HI) between particles (including the effect of the particle immersion depth). Simulation results are presented for neutrally wetted particles which form a contact angle θ=900 at the interface. FINDINGS The simulation results suggest that clustering, fractal growth and particle ordering become favorable outcomes at critically large values of the Pe numbers, while smaller Pe numbers exhibit higher probabilities of final configurations where particle motion remains uncorrelated in space and particle pairs are found to be more widely separated especially upon the introduction of HI.
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Kim H, Lim B, Yoon J, Kim K, Torati SR, Kim C. Magnetophoretic Decoupler for Disaggregation and Interparticle Distance Control. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2021; 8:2100532. [PMID: 34194951 PMCID: PMC8224445 DOI: 10.1002/advs.202100532] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Indexed: 05/17/2023]
Abstract
The manipulation of superparamagnetic beads has attracted various lab on a chip and magnetic tweezer platforms for separating, sorting, and labeling cells and bioentities, but the irreversible aggregation of beads owing to magnetic interactions has limited its actual functionality. Here, an efficient solution is developed for the disaggregation of magnetic beads and interparticle distance control with a magnetophoretic decoupler using an external rotating magnetic field. A unique magnetic potential energy distribution in the form of an asymmetric magnetic thin film around the gap is created and tuned in a controlled manner, regulated by the size ratio of the bead with a magnetic pattern. Hence, the aggregated beads are detached into single beads and transported in one direction in an array pattern. Furthermore, the simultaneous and accurate spacing control of multiple magnetic bead pairs is performed by adjusting the angle of the rotating magnetic field, which continuously changes the energy well associated with a specific shape of the magnetic patterns. This technique offers an advanced solution for the disaggregation and controlled manipulation of beads, can allow new possibilities for the enhanced functioning of lab on a chip and magnetic tweezers platforms for biological assays, intercellular interactions, and magnetic biochip systems.
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Affiliation(s)
- Hyeonseol Kim
- Department of Emerging Materials ScienceDGISTDaegu42988Republic of Korea
| | - Byeonghwa Lim
- Department of Emerging Materials ScienceDGISTDaegu42988Republic of Korea
| | - Jonghwan Yoon
- Department of Emerging Materials ScienceDGISTDaegu42988Republic of Korea
| | - Keonmok Kim
- Department of Emerging Materials ScienceDGISTDaegu42988Republic of Korea
| | - Sri Ramulu Torati
- Department of Emerging Materials ScienceDGISTDaegu42988Republic of Korea
| | - CheolGi Kim
- Department of Emerging Materials ScienceDGISTDaegu42988Republic of Korea
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Villa S, Boniello G, Stocco A, Nobili M. Motion of micro- and nano- particles interacting with a fluid interface. Adv Colloid Interface Sci 2020; 284:102262. [PMID: 32956958 DOI: 10.1016/j.cis.2020.102262] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Revised: 09/02/2020] [Accepted: 09/02/2020] [Indexed: 11/17/2022]
Abstract
In this article, we review both theoretical models and experimental results on the motion of micro- and nano- particles that are close to a fluid interface or move in between two fluids. Viscous drags together with dissipations due to fluctuations of the fluid interface and its physicochemical properties affect strongly the translational and rotational drags of colloidal particles, which are subjected to Brownian motion in thermal equilibrium. Even if many theoretical and experimental investigations have been carried out, additional scientific efforts in hydrodynamics, statistical physics, wetting and colloid science are still needed to explain unexpected experimental results and to measure particle motion in time and space scales, which are not accessible so far.
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Affiliation(s)
- Stefano Villa
- Dipartimento di Biotecnologie Mediche e Medicina Traslazionale, Università degli Studi di Milano, 20090 Segrate, Italy
| | - Giuseppe Boniello
- Surface du Verre et Interfaces (SVI), UMR 125 CNRS/Saint-Gobain Recherche, 93303 Aubervilliers, France
| | - Antonio Stocco
- Institut Charles Sadron (ICS), CNRS, University of Strasbourg, Strasbourg, France.
| | - Maurizio Nobili
- Laboratoire Charles Coulomb (L2C), CNRS, University of Montpellier, Montpellier, France
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Carrasco-Fadanelli V, Castillo R. Measurement of the capillary interaction force between Janus colloidal particles trapped at a flat air/water interface. SOFT MATTER 2020; 16:5910-5914. [PMID: 32567631 DOI: 10.1039/d0sm00288g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The capillary interaction force between spherical Janus particles trapped at the air-water interface is measured using a time-sharing optical tweezer (bond number ≪ 1). One face of the particles is hydrophilic, and the other one, hydrophobic. Measured force goes from almost pure quadrupolar to almost pure hexapolar interaction due to the three-phase contact line corrugation. Measured force curves are modeled as a sum of power laws, Ar-α + Br-β + Cr-γ, obtained from an expansion in capillary multipoles. The mean values for the exponents of particle pairs of 3 μm are 〈α〉 = 5.05 ± 0.12, 〈β〉 = 7.02 ± 0.03, and 〈γ〉 = 5.96 ± 0.03. For particles pairs of 5 μm, we find 〈α〉 = 5.02 ± 0.04, 〈β〉 = 6.94 ± 0.06, and 〈γ〉 = 5.80 ± 0.05. In both cases, A < 0, B < 0, and C > 0.
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Pérez-Juárez D, Sánchez R, Díaz-Leyva P, Kozina A. Equilibrium clustering of colloidal particles at an oil/water interface due to competing long-range interactions. J Colloid Interface Sci 2020; 571:232-238. [PMID: 32200167 DOI: 10.1016/j.jcis.2020.03.038] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Revised: 03/07/2020] [Accepted: 03/09/2020] [Indexed: 10/24/2022]
Abstract
HYPOTHESIS Colloids at fluid interfaces organize according to inter-particle interactions. The main contributions to an effective interaction potential are expected to be electrostatic dipole-dipole repulsion and capillary attraction due to fluid interface deformation. When these interactions are weak, a secondary minimum in the particle pair interaction potential is expected. EXPERIMENTS Clean bare silica particles were deposited at an oil/water interface and their organization as well as dynamics were observed under a light microscope and analyzed in terms of radial distribution function and mean squared displacement. FINDINGS Weak long-range competing interactions between colloids at an oil/water interface result in cluster formation. The clusters have a liquid-like structure and grow with increasing particle packing fraction. System 'ergodicity' suggests near-equilibrium assembly, which is confirmed by free particle dynamics outside the clusters. The interplay between dipole-dipole repulsion and capillary attraction responsible for the cluster formation is reflected in a secondary minimum of the effective interaction potential predicted theoretically but inaccessible experimentally from collective particle properties prior to this work.
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Affiliation(s)
- David Pérez-Juárez
- Instituto de Química, Universidad Nacional Autónoma de México, P.O. Box 70-213, 04510 Mexico City, Mexico
| | - Rodrigo Sánchez
- Departamento de Física, Universidad Autónoma Metropolitana Iztapalapa, San Rafael Atlixco 186, 09340 Mexico City, Mexico
| | - Pedro Díaz-Leyva
- Departamento de Física, Universidad Autónoma Metropolitana Iztapalapa, San Rafael Atlixco 186, 09340 Mexico City, Mexico
| | - Anna Kozina
- Instituto de Química, Universidad Nacional Autónoma de México, P.O. Box 70-213, 04510 Mexico City, Mexico.
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Lotito V, Karlušić M, Jakšić M, Tomić Luketić K, Müller U, Zambelli T, Fazinić S. Shape Deformation in Ion Beam Irradiated Colloidal Monolayers: An AFM Investigation. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:E453. [PMID: 32138349 PMCID: PMC7153618 DOI: 10.3390/nano10030453] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Revised: 02/22/2020] [Accepted: 02/28/2020] [Indexed: 01/05/2023]
Abstract
Self-assembly of colloidal monolayers represents a prominent approach to the fabrication of nanostructures. The modification of the shape of colloidal particles is essential in order to enrich the variety of attainable patterns which would be limited by the typical assembly of spherical particles in a hexagonal arrangement. Polymer particles are particularly promising in this sense. In this article, we investigate the deformation of closely-packed polystyrene particles under MeV oxygen ion irradiation at normal incidence using atomic force microscopy (AFM). By developing a procedure based on the fitting of particle topography with quadrics, we reveal a scenario of deformation more complex than the one observed in previous studies for silica particles, where several phenomena, including ion hammering, sputtering, chemical modifications, can intervene in determining the final shape due to the specific irradiation conditions. In particular, deformation into an ellipsoidal shape is accompanied by shrinkage and polymer redistribution with the presence of necks between particles for increasing ion fluence. In addition to casting light on particle irradiation in a regime not yet explored, we present an effective method for the characterization of the colloidal particle morphology which can be applied to describe and understand particle deformation in other regimes of irradiation or with different techniques.
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Affiliation(s)
- Valeria Lotito
- Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia; (M.K.); (M.J.); (K.T.L.)
- Laboratory of Biosensors and Bioelectronics, Institute for Biomedical Engineering, ETH Zurich, Gloriastrasse 35, 8092 Zurich, Switzerland;
| | - Marko Karlušić
- Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia; (M.K.); (M.J.); (K.T.L.)
| | - Milko Jakšić
- Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia; (M.K.); (M.J.); (K.T.L.)
| | - Kristina Tomić Luketić
- Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia; (M.K.); (M.J.); (K.T.L.)
| | - Ulrich Müller
- Nanoscale Materials Science, Empa—Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland;
| | - Tomaso Zambelli
- Laboratory of Biosensors and Bioelectronics, Institute for Biomedical Engineering, ETH Zurich, Gloriastrasse 35, 8092 Zurich, Switzerland;
| | - Stjepko Fazinić
- Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia; (M.K.); (M.J.); (K.T.L.)
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Ha Eun L, Kyu Hwan C, Xia M, Dong Woo K, Bum Jun P. Interactions between polystyrene particles with diameters of several tens to hundreds of micrometers at the oil-water interface. J Colloid Interface Sci 2020; 560:838-848. [PMID: 31708257 DOI: 10.1016/j.jcis.2019.10.095] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Revised: 10/24/2019] [Accepted: 10/24/2019] [Indexed: 11/26/2022]
Abstract
HYPOTHESIS The charged spherical colloidal particles at the fluid-fluid interface experience considerably strong and long-ranged electrostatic and capillary interactions. The contribution of capillary force becomes more significant as the particle size increases beyond a certain limit. The relative strengths of the two competing interactions between the spherical polystyrene particles at the oil-water interface are quantified depending on their size. EXPERIMENTS The studied particles, obtained using the microfluidic method, have diameters of tens to hundreds of micrometers. The scaling behaviors of the commercially available colloidal particles with diameters of ~3 μm are also compared. An optical laser tweezer apparatus is used to directly or indirectly measure the interparticle force. Subsequently, the capillary force that can be attributed to the gravity-induced interface deformation and contact line undulation is calculated and compared with the measured interaction force. FINDINGS Regardless of the particle diameter (~3-330 μm), the measured force is observed to decay as r-4, where r denotes the center-to-center separation, demonstrating that the dipolar electrostatic interaction is important and that the gravity-induced capillary interaction is negligible. Furthermore, numerical calculations with respect to the undulated meniscus confirm that the magnitude of capillary interaction is significantly smaller than that of the measured electrostatic interaction.
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Affiliation(s)
- Lee Ha Eun
- Department of Chemical Engineering, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin 17104, South Korea
| | - Choi Kyu Hwan
- Department of Chemical Engineering, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin 17104, South Korea
| | - Ming Xia
- Department of Chemical Engineering, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin 17104, South Korea
| | - Kang Dong Woo
- Department of Chemical Engineering, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin 17104, South Korea
| | - Park Bum Jun
- Department of Chemical Engineering, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin 17104, South Korea.
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Ho I, Pucci G, Harris DM. Direct Measurement of Capillary Attraction between Floating Disks. PHYSICAL REVIEW LETTERS 2019; 123:254502. [PMID: 31922794 DOI: 10.1103/physrevlett.123.254502] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2019] [Revised: 09/03/2019] [Indexed: 06/10/2023]
Abstract
Two bodies resting at a fluid interface may interact laterally due to the surface deformations they induce. Here we use an applied magnetic force to perform direct measurements of the capillary attraction force between centimetric disks floating at an air-water interface. We compare our measurements to numerical simulations that take into account the disk's vertical displacement and spontaneous tilt, showing that both effects are necessary to describe the attraction force for short distances. We characterize the dependence of the attraction force on the disk mass, diameter, and relative spacing, and develop a scaling law that captures the observed dependence of the capillary force on the experimental parameters.
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Affiliation(s)
- Ian Ho
- School of Engineering, Brown University, 184 Hope Street, Providence, Rhode Island 02912, USA
| | - Giuseppe Pucci
- School of Engineering, Brown University, 184 Hope Street, Providence, Rhode Island 02912, USA
- Univ Rennes, CNRS, IPR (Institut de Physique de Rennes)-UMR 6251, F-35000 Rennes, France
| | - Daniel M Harris
- School of Engineering, Brown University, 184 Hope Street, Providence, Rhode Island 02912, USA
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