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Baran Ł, Borówko M, Rżysko W, Smołka J. Amphiphilic Janus Particles Confined in Symmetrical and Janus-Like Slits. ACS OMEGA 2023; 8:18863-18873. [PMID: 37273616 PMCID: PMC10233691 DOI: 10.1021/acsomega.3c01180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Accepted: 05/04/2023] [Indexed: 06/06/2023]
Abstract
We use Monte Carlo simulations to investigate the behavior of Janus spheres composed of attractive and repulsive parts confined between two parallel solid surfaces. The slits with identical and competing walls are studied. The adsorption isotherms of Janus particles are determined, and the impact of the density in the pore on the morphology is discussed in detail. So far, this issue has not been systematically investigated. New, unique structures are observed along the isotherms, including the bilayer and three-layer structures located at different distances from the walls. We analyze how selected parameters affect the positional and orientational ordering in these layers. In some cases, the particles form highly ordered hexagonal lattices.
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Affiliation(s)
- Łukasz Baran
- Department
of Theoretical Chemistry, Institute of Chemical Sciences, Faculty
of Chemistry, Maria Curie-Sklodowska University in Lublin, Pl. M Curie-Sklodowskiej 3, 20-031 Lublin, Poland
| | - Małgorzata Borówko
- Department
of Theoretical Chemistry, Institute of Chemical Sciences, Faculty
of Chemistry, Maria Curie-Sklodowska University in Lublin, Pl. M Curie-Sklodowskiej 3, 20-031 Lublin, Poland
| | - Wojciech Rżysko
- Department
of Theoretical Chemistry, Institute of Chemical Sciences, Faculty
of Chemistry, Maria Curie-Sklodowska University in Lublin, Pl. M Curie-Sklodowskiej 3, 20-031 Lublin, Poland
| | - Jakub Smołka
- Department
of Computer Science, Lublin University of
Technology, Nadbystrzycka 36B, 20-618 Lublin, Poland
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Krishnamurthy S, Mathews Kalapurakal RA, Mani E. Computer simulations of self-assembly of anisotropic colloids. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 34:273001. [PMID: 35172296 DOI: 10.1088/1361-648x/ac55d6] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2021] [Accepted: 02/16/2022] [Indexed: 06/14/2023]
Abstract
Computer simulations have played a significant role in understanding the physics of colloidal self-assembly, interpreting experimental observations, and predicting novel mesoscopic and crystalline structures. Recent advances in computer simulations of colloidal self-assembly driven by anisotropic or orientation-dependent inter-particle interactions are highlighted in this review. These interactions are broadly classified into two classes: entropic and enthalpic interactions. They mainly arise due to shape anisotropy, surface heterogeneity, compositional heterogeneity, external field, interfaces, and confinements. Key challenges and opportunities in the field are discussed.
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Affiliation(s)
- Sriram Krishnamurthy
- Polymer Engineering and Colloids Science Laboratory, Department of Chemical Engineering, Indian Institute of Technology Madras, Chennai-600036, India
| | - Remya Ann Mathews Kalapurakal
- Polymer Engineering and Colloids Science Laboratory, Department of Chemical Engineering, Indian Institute of Technology Madras, Chennai-600036, India
| | - Ethayaraja Mani
- Polymer Engineering and Colloids Science Laboratory, Department of Chemical Engineering, Indian Institute of Technology Madras, Chennai-600036, India
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Safaei S, Hendy SC, Willmott GR. Stability of amphiphilic Janus dimers in shear flow: a molecular dynamics study. SOFT MATTER 2020; 16:7116-7125. [PMID: 32658948 DOI: 10.1039/d0sm00871k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Amphiphilic Janus particles in a flow are thought to experience a torque due to the asymmetry in slip at their surfaces. This effect has the potential to destabilise self-assembled Janus structures in flows due to the forces and torques applied to individual Janus nanoparticles. In this work, we investigate the stability of amphiphilic Janus dimers and homogeneous hydrophobic dimers in shear flow using molecular dynamics, and study possible break-up mechanisms. In particular, we consider the influence of the activation enthalpy and entropy on the thermal break-up rate of these dimers. Janus dimers are less stable than hydrophobic dimers, and increasing the applied shear rate has a greater effect on break-up for Janus dimers. Two mechanisms leading to increased break-up in shear flow are studied, namely the rotational speed of the dimers and the orientation of individual spheres in the dimers, and we propose a descriptive equation for calculation of the break-up rate. Overall, the results indicate that the stability of dimers in shear flow depends on the slip length at the spheres' surfaces, and that the slip length difference on Janus dimers could contribute to destabilisation.
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Affiliation(s)
- Sina Safaei
- The MacDiarmid Institute for Advanced Materials and Nanotechnology, Department of Physics, University of Auckland, New Zealand.
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Cerbelaud M, Lebdioua K, Tran CT, Crespin B, Aimable A, Videcoq A. Brownian dynamics simulations of one-patch inverse patchy particles. Phys Chem Chem Phys 2019; 21:23447-23458. [PMID: 31616876 DOI: 10.1039/c9cp04247d] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Inverse patchy particles are promising colloids to develop new architectures in ceramic materials based on their self-assembly. Nonetheless, a good understanding of their aggregation is required. Several previous studies have shown that the behavior of ceramic colloids can be well described by the DLVO interaction potential. In the present paper, we develop new coarse-grained Brownian dynamics simulations, where particles are represented by an assembly of beads interacting via DLVO interactions, whose parameters can be directly linked to experimental characterization. First, the validity of the simulations is proved by studying the heteroaggregation of homogeneously charged particles. Then, simulations are applied to one-patch inverse patchy particles to study the effect of the patch size. They show that the smaller the patch, the more elongated the aggregates. Simulations are also performed to understand the role of the Debye screening length in the particular case of large patches and they show that aggregation leads always to compact aggregates.
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Tsyrenova A, Miller K, Yan J, Olson E, Anthony SM, Jiang S. Surfactant-Mediated Assembly of Amphiphilic Janus Spheres. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:6106-6111. [PMID: 30950625 DOI: 10.1021/acs.langmuir.9b00500] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
We investigate how amphiphilic Janus particle assembly structures, including clusters and striped two-dimensional (2D) crystals, are influenced by the addition of surfactant molecules. Janus particles are fabricated using silica particles coated with Au on one side, which is further modified with a hydrophobic self-assembled monolayer. Analysis on the cluster assembly structures suggests that in addition to hydrophobic attraction, van der Waals (VDW) attraction plays a significant role in the assembly process, which is modulated by the Au coating thickness. This is manifested by the cluster formation induced primarily by VDW forces when the hydrophobic attraction between particles is diminished by adding the surfactant. In the 2D crystal case, sodium dodecyl sulfate (SDS) and Tween 20 show opposite trends in how they affect assembly structures and particle dynamics. SDS shortens the stripes in 2D crystals and accelerates the rotation of particles, whereas Tween 20 extends the straight stripes and slows down the particle rotation. We interpret the results by considering SDS adsorption on the Au-coated hemisphere of the Janus particles and Tween 20 forming hydrogen bonds with the silica hemisphere of Janus particles. Our study offers a simple approach to change the assembly structures of Janus particles, and it provides principles and guidance for potential applications of Janus particles coupled with small amphiphilic molecules.
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Affiliation(s)
- Ayuna Tsyrenova
- Department of Materials Science and Engineering , Iowa State University , Ames , Iowa 50011 , United States
| | - Kyle Miller
- Department of Materials Science and Engineering , Iowa State University , Ames , Iowa 50011 , United States
| | - Jing Yan
- Department of Molecular, Cellular and Developmental Biology , Yale University , New Haven , Connecticut 06511 , United States
| | - Emily Olson
- Department of Materials Science and Engineering , Iowa State University , Ames , Iowa 50011 , United States
| | - Stephen M Anthony
- Department of Bioenergy and Defense Technologies , Sandia National Laboratories , Albuquerque , New Mexico 87123 , United States
| | - Shan Jiang
- Department of Materials Science and Engineering , Iowa State University , Ames , Iowa 50011 , United States
- Division of Materials Science and Engineering , Ames National Laboratory , Ames , Iowa 50011 , United States
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Rovigatti L, Russo J, Romano F. How to simulate patchy particles ⋆. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2018; 41:59. [PMID: 29748868 DOI: 10.1140/epje/i2018-11667-x] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2018] [Accepted: 04/16/2018] [Indexed: 06/08/2023]
Abstract
Patchy particles is the name given to a large class of systems of mesoscopic particles characterized by a repulsive core and a discrete number of short-range and highly directional interaction sites. Numerical simulations have contributed significantly to our understanding of the behaviour of patchy particles, but, although simple in principle, advanced simulation techniques are often required to sample the low temperatures and long time-scales associated with their self-assembly behaviour. In this work we review the most popular simulation techniques that have been used to study patchy particles, with a special focus on Monte Carlo methods. We cover many of the tools required to simulate patchy systems, from interaction potentials to biased moves, cluster moves, and free-energy methods. The review is complemented by an educationally oriented Monte Carlo computer code that implements all the techniques described in the text to simulate a well-known tetrahedral patchy particle model.
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Affiliation(s)
- Lorenzo Rovigatti
- CNR-ISC, Uos Sapienza, Piazzale A. Moro 2, 00185, Roma, Italy.
- Dipartimento di Fisica, Sapienza Università di Roma, Piazzale A. Moro 2, 00185, Roma, Italy.
| | - John Russo
- School of Mathematics, University of Bristol, BS8 1TW, Bristol, UK
| | - Flavio Romano
- Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca' Foscari di Venezia, Via Torino 155, 30172, Venezia Mestre, Italy
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Rezvantalab H, Beltran-Villegas DJ, Larson RG. Phase diagram of Janus particles: The missing dimension of pressure anisotropy. J Chem Phys 2017; 147:064510. [PMID: 28810762 DOI: 10.1063/1.4997784] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Brownian dynamics simulations of single-patch Janus particles under sedimentation equilibrium reveal that the phases found at fixed temperature and volume fraction are extremely sensitive to small changes in lateral box dimension. We trace this sensitivity to an uncontrolled parameter, namely, the pressure component parallel to the hexagonally ordered layers formed through sedimentation. We employ a flexible-cell constant-pressure scheme to achieve explicit control over this usually overlooked parameter, enabling the estimation of phase behavior under given pressure anisotropy. Our results show an increase in the stability range of an orientationally ordered lamellar phase with lateral layer compression and suggest a novel mechanism to control solid-solid phase transitions with negligible change in system volume, thus showing prospect for design of novel structures and switchable crystals from anisotropic building blocks.
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Affiliation(s)
- Hossein Rezvantalab
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA
| | | | - Ronald G Larson
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA
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8
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Porter CL, Crocker JC. Directed assembly of particles using directional DNA interactions. Curr Opin Colloid Interface Sci 2017. [DOI: 10.1016/j.cocis.2017.04.005] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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Yi Y, Sanchez L, Gao Y, Lee K, Yu Y. Interrogating Cellular Functions with Designer Janus Particles. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2017; 29:1448-1460. [PMID: 31530969 PMCID: PMC6748339 DOI: 10.1021/acs.chemmater.6b05322] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Janus particles have two distinct surfaces or compartments. This enables novel applications that are impossible with homogeneous particles, ranging from the engineering of active colloidal metastructures to creating multimodal therapeutic materials. Recent years have witnessed a rapid development of novel Janus structures and exploration of their applications, particularly in the biomedical arena. It, therefore, becomes crucial to understand how Janus particles with surface or structural anisotropy might interact with biological systems and how such interactions may be exploited to manipulate biological responses. This perspective highlights recent studies that have employed Janus particles as novel toolsets to manipulate, measure, and understand cellular functions. Janus particles have been shown to have biological interactions different from uniform particles. Their surface anisotropy has been used to control the cell entry of synthetic particles, to spatially organize stimuli for the activation of immune cells, and to enable direct visualization and measurement of rotational dynamics of particles in living systems. The work included in this perspective showcases the significance of understanding the biological interactions of Janus particles and the tremendous potential of harnessing such interactions to advance the development of Janus structure-based biomaterials.
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Affiliation(s)
| | | | | | | | - Yan Yu
- Corresponding Author (Y.Yu)
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Castro N, Constantin D, Davidson P, Abécassis B. Solution self-assembly of plasmonic Janus nanoparticles. SOFT MATTER 2016; 12:9666-9673. [PMID: 27869281 DOI: 10.1039/c6sm01632d] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Janus nanoparticles bearing two different properties on a single particle are amenable to self-assembly into higher-order structures via their directional interaction. We show that gold/silica Janus nanoparticles self-assemble in solution into clusters resembling colloidal micelles upon addition of a hydrophobic thiol which provides them with a surface active amphiphilic character. As the nanoparticles spontaneously assemble, the color of the solution evolves due to the coupling of the surface plasmons. Time resolved spectrophotometry in the visible and near-infrared ranges coupled to simulations were used to probe the assembly process. A singular value decomposition analysis reveals the presence of dimers as transient species. The structure of the clusters was probed using small angle X-ray revealing that the Janus nanoparticles assemble into clusters containing a few particles.
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Affiliation(s)
- Nicolò Castro
- Laboratoire de Physique des Solides, Univ. Paris-Sud, CNRS, UMR 8502, F-91405 Orsay Cedex, France.
| | - Doru Constantin
- Laboratoire de Physique des Solides, Univ. Paris-Sud, CNRS, UMR 8502, F-91405 Orsay Cedex, France.
| | - Patrick Davidson
- Laboratoire de Physique des Solides, Univ. Paris-Sud, CNRS, UMR 8502, F-91405 Orsay Cedex, France.
| | - Benjamin Abécassis
- Laboratoire de Physique des Solides, Univ. Paris-Sud, CNRS, UMR 8502, F-91405 Orsay Cedex, France. and Laboratoire de Chimie, ENS de Lyon, CNRS UMR 5182, Université Claude Bernard, Université de Lyon, F-69342 Lyon, France
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Chambers M, Mallory SA, Malone H, Gao Y, Anthony SM, Yi Y, Cacciuto A, Yu Y. Lipid membrane-assisted condensation and assembly of amphiphilic Janus particles. SOFT MATTER 2016; 12:9151-9157. [PMID: 27796398 DOI: 10.1039/c6sm02171a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Amphiphilic Janus particles self-assemble into complex metastructures, but little is known about how their assembly might be modified by weak interactions with a nearby biological membrane surface. Here, we report an integrated experimental and molecular dynamics simulation study to investigate the self-assembly of amphiphilic Janus particles on a lipid membrane. We created an experimental system in which Janus particles are allowed to self-assemble in the same medium where zwitterionic lipids form giant unilamellar vesicles (GUVs). Janus particles spontaneously concentrated on the inner leaflet of the GUVs. They exhibited biased orientation and heterogeneous rotational dynamics as revealed by single particle rotational tracking. The combined experimental and simulation results show that Janus particles concentrate on the lipid membranes due to weak particle-lipid attraction, whereas the biased orientation of particles is driven predominantly by inter-particle interactions. This study demonstrates the potential of using lipid membranes to influence the self-assembly of Janus particles.
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Affiliation(s)
- Mariah Chambers
- Department of Chemistry, Indiana University, Bloomington, IN 47405, USA.
| | | | - Heather Malone
- Department of Chemistry, Indiana University, Bloomington, IN 47405, USA.
| | - Yuan Gao
- Department of Chemistry, Indiana University, Bloomington, IN 47405, USA.
| | - Stephen M Anthony
- Department of Bioenergy and Defense Technology, Sandia National Laboratories, Albuquerque, NM 87123, USA
| | - Yi Yi
- Department of Chemistry, Indiana University, Bloomington, IN 47405, USA.
| | - Angelo Cacciuto
- Department of Chemistry, Columbia University, 3000 Broadway, New York, NY 10027, USA.
| | - Yan Yu
- Department of Chemistry, Indiana University, Bloomington, IN 47405, USA.
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Rezvantalab H, Beltran-Villegas DJ, Larson RG. Rotator-to-Lamellar Phase Transition in Janus Colloids Driven by Pressure Anisotropy. PHYSICAL REVIEW LETTERS 2016; 117:128001. [PMID: 27689298 DOI: 10.1103/physrevlett.117.128001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2016] [Indexed: 06/06/2023]
Abstract
We demonstrate through Brownian dynamics simulations a phase transition in plastic crystalline assemblies of Janus spheres through controlled pressure anisotropy. When the pressure in plane with hexagonally ordered layers is increased relative to that normal to the layers, a rapid first-order rotator-to-lamellar transition of Janus sphere orientation occurs at constant temperature. We show that the underlying mechanism closely follows the Maier-Saupe theory, originally developed for isotropic-to-nematic transition in positionally disordered materials but here applied to positionally ordered ones. Since the transition involves almost no translational diffusion or volume change, and occurs rapidly by particle rotation, the results should help guide the design of rapidly switchable colloidal crystals.
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Affiliation(s)
- Hossein Rezvantalab
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA
| | | | - Ronald G Larson
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA
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Kirillova A, Stoychev G, Synytska A. Programmed assembly of oppositely charged homogeneously decorated and Janus particles. Faraday Discuss 2016; 191:89-104. [DOI: 10.1039/c6fd00008h] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The exploitation of colloidal building blocks with morphological and functional anisotropy facilitates the generation of complex structures with unique properties, which are not exhibited by isotropic particle assemblies. Herein, we demonstrate an easy and scalable bottom-up approach for the programmed assembly of hairy oppositely charged homogeneously decorated and Janus particles based on electrostatic interactions mediated by polyelectrolytes grafted onto their surface. Two different assembly routes are proposed depending on the target structures: raspberry-like/half-raspberry-like or dumbbell-like micro-clusters. Ultimately, stable symmetric and asymmetric micro-structures could be obtained in a well-controlled manner for the homogeneous–homogeneous and homogeneous–Janus particle assemblies, respectively. The spatially separated functionalities of the asymmetric Janus particle-based micro-clusters allow their further assembly into complex hierarchical constructs, which may potentially lead to the design of materials with tailored plasmonics and optical properties.
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Affiliation(s)
- Alina Kirillova
- Leibniz Institute of Polymer Research Dresden
- 01069 Dresden
- Germany
- Technische Universität Dresden
- Fakultät Mathematik und Naturwissenschaften
| | - Georgi Stoychev
- Leibniz Institute of Polymer Research Dresden
- 01069 Dresden
- Germany
- Technische Universität Dresden
- Fakultät Mathematik und Naturwissenschaften
| | - Alla Synytska
- Leibniz Institute of Polymer Research Dresden
- 01069 Dresden
- Germany
- Technische Universität Dresden
- Fakultät Mathematik und Naturwissenschaften
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