1
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Das P, Dubey AK, Puri S. Pattern dynamics of density and velocity fields in segregation of fluid mixtures. J Chem Phys 2024; 160:154507. [PMID: 38634496 DOI: 10.1063/5.0203489] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2024] [Accepted: 04/02/2024] [Indexed: 04/19/2024] Open
Abstract
We present comprehensive numerical results from a study of model H, which describes phase separation kinetics in binary fluid mixtures. We study the pattern dynamics of both density and velocity fields in d = 2, 3. The density length scales show three distinct regimes, in accordance with analytical arguments. The velocity length scale shows a diffusive behavior. We also study the scaling behavior of the morphologies for density and velocity fields and observe dynamical scaling in the relevant correlation functions and structure factors. Finally, we study the effect of quenched random field disorder on spinodal decomposition in model H.
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Affiliation(s)
- Prasenjit Das
- Department of Physical Sciences, Indian Institute of Science Education and Research Mohali, Sector 81, S.A.S. Nagar, 140306 Punjab, India
| | - Awadhesh Kumar Dubey
- Department of Pure and Applied Physics, Guru Ghasidas Vishwavidyalaya, Bilaspur 495009, Chhattisgarh, India
| | - Sanjay Puri
- School of Physical Sciences, Jawaharlal Nehru University, New Delhi 110067, India
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2
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Ghosh S, Douglas JF. Phase separation in the presence of fractal aggregates. J Chem Phys 2024; 160:104903. [PMID: 38469910 DOI: 10.1063/5.0190196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2023] [Accepted: 02/16/2024] [Indexed: 03/13/2024] Open
Abstract
Liquid-liquid phase separation in diverse manufacturing and biological contexts often occurs in the presence of aggregated particles or complex-shaped structures that do not actively participate in the phase separation process, but these "background" structures can serve to direct the macroscale phase separation morphology by their local symmetry-breaking presence. We perform Cahn-Hilliard phase-field simulations in two dimensions to investigate the morphological evolution, wetting, and domain growth phenomena during the phase separation of a binary mixture in contact with model fractal aggregates. Our simulations reveal that phase separation initially accelerates around the fractal due to the driving force of wetting, leading to the formation of the target composition patterns about the fractals, as previously observed for circular particles. After the formation of a wetting layer on the fractal, however, we observe a dramatic slowing-down in the kinetics of phase separation, and the characteristic domain size eventually "pins" to a finite value or approaches an asymptotic scaling regime as an ordinary phase if the phase separation loses memory of the aggregates when the scale of phase separation becomes much larger than the aggregate. Furthermore, we perform simulations to examine the effects of compositional interference between fractals with a view to elucidating interesting novel morphological features in the phase-separating mixture. Our findings should be helpful in understanding the qualitative aspects of the phase separation processes in mixtures containing particle aggregates relevant for coating, catalyst, adhesive, and electronic applications as well as in diverse biological contexts, where phase separation occurs in the presence of irregular heterogeneities.
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Affiliation(s)
- Supriyo Ghosh
- Metallurgical & Materials Engineering Department, Indian Institute of Technology, Roorkee, Uttarakhand 247667, India
| | - Jack F Douglas
- Materials Science & Engineering Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
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3
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Neuman A, Zhang S, Lee D, Riggleman RA. Increases in Miscibility of a Binary Polymer Blend Confined within a Nanoparticle Packing. Macromolecules 2023. [DOI: 10.1021/acs.macromol.2c01918] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Anastasia Neuman
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania19104, United States
| | - Shannon Zhang
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania19104, United States
| | - Daeyeon Lee
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania19104, United States
| | - Robert A. Riggleman
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania19104, United States
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4
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Ghosh S, Mukherjee A, Arroyave R, Douglas JF. Impact of particle arrays on phase separation composition patterns. J Chem Phys 2020; 152:224902. [PMID: 32534548 DOI: 10.1063/5.0007859] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We examine the symmetry-breaking effect of fixed constellations of particles on the surface-directed spinodal decomposition of binary blends in the presence of particles whose surfaces have a preferential affinity for one of the components. Our phase-field simulations indicate that the phase separation morphology in the presence of particle arrays can be tuned to have a continuous, droplet, lamellar, or hybrid morphology depending on the interparticle spacing, blend composition, and time. In particular, when the interparticle spacing is large compared to the spinodal wavelength, a transient target pattern composed of alternate rings of preferred and non-preferred phases emerges at early times, tending to adopt the symmetry of the particle configuration. We reveal that such target patterns stabilize for certain characteristic length, time, and composition scales characteristic of the pure phase-separating mixture. To illustrate the general range of phenomena exhibited by mixture-particle systems, we simulate the effects of single-particle, multi-particle, and cluster-particle systems having multiple geometrical configurations of the particle characteristic of pattern substrates on phase separation. Our simulations show that tailoring the particle configuration, or substrate pattern configuration, a relative fluid-particle composition should allow the desirable control of the phase separation morphology as in block copolymer materials, but where the scales accessible to this approach of organizing phase-separated fluids usually are significantly larger. Limited experiments confirm the trends observed in our simulations, which should provide some guidance in engineering patterned blend and other mixtures of technological interest.
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Affiliation(s)
- Supriyo Ghosh
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - Arnab Mukherjee
- Center for Hierarchical Materials Design, Northwestern University, Evanston, Illinois 60208, USA
| | - Raymundo Arroyave
- Materials Science and Engineering Department, Texas A&M University, College Station, Texas 77843, USA
| | - Jack F Douglas
- Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
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5
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Li Q, Wang L, Lin J, Zhang L. Distinctive phase separation dynamics of polymer blends: roles of Janus nanoparticles. Phys Chem Chem Phys 2019; 21:2651-2658. [DOI: 10.1039/c8cp06431h] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The present work demonstrates that Janus nanoparticles uniquely promote the phase separation of polymer blends at the early stage of spinodal decomposition, but impede it at the late stage.
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Affiliation(s)
- Qing Li
- Shanghai Key Laboratory of Advanced Polymeric Materials
- State Key Laboratory of Bioreactor Engineering
- Key Laboratory for Ultrafine Materials of Ministry of Education
- School of Materials Science and Engineering
- East China University of Science and Technology
| | - Liquan Wang
- Shanghai Key Laboratory of Advanced Polymeric Materials
- State Key Laboratory of Bioreactor Engineering
- Key Laboratory for Ultrafine Materials of Ministry of Education
- School of Materials Science and Engineering
- East China University of Science and Technology
| | - Jiaping Lin
- Shanghai Key Laboratory of Advanced Polymeric Materials
- State Key Laboratory of Bioreactor Engineering
- Key Laboratory for Ultrafine Materials of Ministry of Education
- School of Materials Science and Engineering
- East China University of Science and Technology
| | - Liangshun Zhang
- Shanghai Key Laboratory of Advanced Polymeric Materials
- State Key Laboratory of Bioreactor Engineering
- Key Laboratory for Ultrafine Materials of Ministry of Education
- School of Materials Science and Engineering
- East China University of Science and Technology
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6
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Barbot A, Araki T. Colloidal suspensions in one-phase mixed solvents under shear flow. SOFT MATTER 2017; 13:5911-5921. [PMID: 28770264 DOI: 10.1039/c7sm00861a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We numerically studied the behaviour of colloidal suspensions in one-phase binary liquid mixtures under shear flows. Far from the phase-separation point, the colloidal particles are well dispersed and the suspension exhibits a Newtonian viscosity. When the mixture is close to the coexistence curve, the colloidal particles aggregate by attractive interactions due to the concentration heterogeneity caused by surface wetting, and the viscosity of the suspension increases. Near the phase-separation point, the viscosity increases when the fraction of species favoured by the surface of a colloid particle is small. The mixture also exhibits shear thinning behaviour, since the aggregated structure is rearranged into small clusters due to the shear flow. Our simulations indicate that the concentration profile around each particle is not significantly disturbed by the shear flow at the onset of the structural rearrangements. The effective interaction is independent of the shear flow and remains isotropic.
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Affiliation(s)
- Armand Barbot
- Department of Physics, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan.
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7
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Guo YQ, Pan JX, Sun MN, Zhang JJ. Phase transition of a symmetric diblock copolymer induced by nanorods with different surface chemistry. J Chem Phys 2017; 146:024902. [PMID: 28088151 DOI: 10.1063/1.4973560] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
We investigate the phase transition of a symmetric diblock copolymer induced by nanorods with different surface chemistry. The results demonstrate that the system occurs the phase transition from a disordered structure to ordered parallel lamellae and then to the tilted layered structure as the number of rods increases. The dynamic evolution of the domain size and the order parameter of the microstructure are also examined. Furthermore, the influence of rod property, rod-phase interaction, rod-rod interaction, rod length, and polymerization degree on the behavior of the polymer system is also investigated systematically. Moreover, longer amphiphilic nanorods tend to make the polymer system form the hexagonal structure. It transforms into a perpendicular lamellar structure as the polymerization degree increases. Our simulations provide an efficient method for determining how to obtain the ordered structure on the nanometer scales and design the functional materials with optical, electronic, and magnetic properties.
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Affiliation(s)
- Yu-Qi Guo
- School of Physics and Information Engineering, Shanxi Normal University, Linfen 041004, China
| | - Jun-Xing Pan
- School of Chemistry and Materials Science, Shanxi Normal University, Linfen 041004, China
| | - Min-Na Sun
- School of Chemistry and Materials Science, Shanxi Normal University, Linfen 041004, China
| | - Jin-Jun Zhang
- School of Physics and Information Engineering, Shanxi Normal University, Linfen 041004, China
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Ghosh S, Mukherjee A, Abinandanan TA, Bose S. Particles with selective wetting affect spinodal decomposition microstructures. Phys Chem Chem Phys 2017; 19:15424-15432. [DOI: 10.1039/c7cp01816a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have used mesoscale simulations to study the effect of immobile particles on microstructure formation during spinodal decomposition in ternary mixtures such as polymer blends.
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Affiliation(s)
- Supriyo Ghosh
- Materials Engineering Department
- Indian Institute of Science
- Bangalore 560012
- India
| | - Arnab Mukherjee
- Materials Engineering Department
- Indian Institute of Science
- Bangalore 560012
- India
| | - T. A. Abinandanan
- Materials Engineering Department
- Indian Institute of Science
- Bangalore 560012
- India
| | - Suryasarathi Bose
- Materials Engineering Department
- Indian Institute of Science
- Bangalore 560012
- India
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9
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Liu X, Dong X, Liu W, Xing Q, Zou F, Han CC, Wang D, Liang A, Li C, Xie X. Characterization on the phase separation behavior of styrene-butadiene rubber/polyisoprene/organoclay ternary blends under oscillatory shear. J Chem Phys 2015; 143:114903. [PMID: 26395734 DOI: 10.1063/1.4930597] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The present work investigated the influence of organoclay (organo-montmorillonite, OMMT) on the phase separation behavior and morphology evolution of solution polymerized styrene-butadiene rubber (SSBR)/low vinyl content polyisoprene (LPI) blends with rheological methodology. It was found that the incorporation of OMMT not only reduced the droplet size of the dispersion phase, slowed down the phase separation kinetics, also enlarged the processing miscibility window of the blends. The determination on the wetting parameters indicated that due to the oscillatory shear effect, the OMMT sheets might localize at the interface between the two phases and act as compatibilizer or rigid barrier to prevent domain coarsening, resulting in slow phase separation kinetics, small droplet size, and stable morphology. The analysis of rheological data by the Palierne model provided further confirmation that the addition of OMMT can decrease the interfacial tension and restrict the relaxation of melt droplets. Therefore, a vivid "sea-fish-net" model was proposed to describe the effect of OMMT on the phase separation behavior of SSBR/LPI blends, in which the OMMT sheets acted as the barrier (net) to slow down the domain coarsening/coalescence in phase separation process of SSBR/LPI blends.
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Affiliation(s)
- Xianggui Liu
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Xia Dong
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Wei Liu
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Qian Xing
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Fasheng Zou
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Charles C Han
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Dujin Wang
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Aimin Liang
- SINOPEC Beijing Research Institute of Chemical Industry, Yanshan Branch, Beijing 102500, People's Republic of China
| | - Chuanqing Li
- SINOPEC Beijing Research Institute of Chemical Industry, Yanshan Branch, Beijing 102500, People's Republic of China
| | - Ximing Xie
- SINOPEC Beijing Research Institute of Chemical Industry, Yanshan Branch, Beijing 102500, People's Republic of China
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10
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Khademzadeh Yeganeh J, Goharpey F, Moghimi E, Petekidis G, Foudazi R. Manipulating the kinetics and mechanism of phase separation in dynamically asymmetric LCST blends by nanoparticles. Phys Chem Chem Phys 2015; 17:27446-61. [DOI: 10.1039/c5cp04042f] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The addition of nanoparticles in dynamically asymmetric LCST blends is used to induce the preferred phase-separating morphology by tuning the dynamic asymmetry, and to control the kinetics of phase separation by slowing down (or even arresting) the domain growth.
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Affiliation(s)
| | - F. Goharpey
- Department of Polymer Engineering
- Amirkabir University of Technology
- Tehran
- Iran
| | - E. Moghimi
- IESL-FORTH and Department of Material Science and Technology
- University of Crete
- GR-711 10 Heraklion
- Greece
| | - G. Petekidis
- IESL-FORTH and Department of Material Science and Technology
- University of Crete
- GR-711 10 Heraklion
- Greece
| | - R. Foudazi
- Department of Chemical and Materials Engineering
- New Mexico State University
- Las Cruces
- USA
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11
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van der Sman R, Meinders M. Mesoscale models of dispersions stabilized by surfactants and colloids. Adv Colloid Interface Sci 2014; 211:63-76. [PMID: 24980050 DOI: 10.1016/j.cis.2014.06.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2014] [Revised: 06/04/2014] [Accepted: 06/05/2014] [Indexed: 10/25/2022]
Abstract
In this paper we discuss and give an outlook on numerical models describing dispersions, stabilized by surfactants and colloidal particles. Examples of these dispersions are foams and emulsions. In particular, we focus on the potential of the diffuse interface models based on a free energy approach, which describe dispersions with the surface-active agent soluble in one of the bulk phases. The free energy approach renders thermodynamic consistent models with realistic sorption isotherms and adsorption kinetics. The free energy approach is attractive because of its ability to describe highly complex dispersions, such as emulsions stabilized by ionic surfactants, or surfactant mixtures and dispersions with surfactant micelles. We have classified existing numerical methods into classes, using either a Eulerian or a Lagrangian representation for fluid and for the surfactant/colloid. A Eulerian representation gives a more coarse-grained, mean field description of the surface-active agent, while a Lagrangian representation can deal with steric effects and larger complexity concerning geometry and (amphiphilic) wetting properties of colloids and surfactants. However, the similarity between the description of wetting properties of both Eulerian and Lagrangian models allows for the development of hybrid Eulerian/Lagrangian models having advantages of both representations.
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12
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Liang Q, Wu QY, Wang ZY. Effect of hydrophobic mismatch on domain formation and peptide sorting in the multicomponent lipid bilayers in the presence of immobilized peptides. J Chem Phys 2014; 141:074702. [DOI: 10.1063/1.4891931] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Qing Liang
- Center for Statistical and Theoretical Condensed Matter Physics and Department of Physics, Zhejiang Normal University, Jinhua 321004, People's Republic of China
- Department of Physics, Ningbo University, Ningbo 315211, People's Republic of China
| | - Qing-Yan Wu
- Center for Statistical and Theoretical Condensed Matter Physics and Department of Physics, Zhejiang Normal University, Jinhua 321004, People's Republic of China
| | - Zhi-Yong Wang
- School of Optoelectronic Information, Chongqing University of Technology, Chongqing 400054, People's Republic of China
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13
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Taguet A, Cassagnau P, Lopez-Cuesta JM. Structuration, selective dispersion and compatibilizing effect of (nano)fillers in polymer blends. Prog Polym Sci 2014. [DOI: 10.1016/j.progpolymsci.2014.04.002] [Citation(s) in RCA: 366] [Impact Index Per Article: 36.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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14
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Tran C, Kalra V. Molecular dynamics study on effect of elongational flow on morphology of immiscible mixtures. J Chem Phys 2014; 140:134902. [DOI: 10.1063/1.4869404] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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15
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Bose S, Cardinaels R, Özdilek C, Leys J, Seo JW, Wübbenhorst M, Moldenaers P. Effect of multiwall carbon nanotubes on the phase separation of concentrated blends of poly[(α-methyl styrene)-co-acrylonitrile] and poly(methyl methacrylate) as studied by melt rheology and conductivity spectroscopy. Eur Polym J 2014. [DOI: 10.1016/j.eurpolymj.2014.01.030] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Hu Z, Zhang J, Wang H, Li T, Liu Z, Yu Y. Dual effects of mesoscopic fillers on the polyethersulfone modified cyanate ester: enhanced viscoelastic effect and mechanical properties. RSC Adv 2014. [DOI: 10.1039/c4ra06808d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Enlarging the filler content and decreasing the filler size contribute to enhancing both viscoelastic effect and mechanical property of polyethersulfone modified cyanate system.
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Affiliation(s)
- Zhongnan Hu
- State Key Laboratory of Molecular Engineering of Polymers
- Department of Macromolecular Science
- Fudan University
- Shanghai, China
| | - Jie Zhang
- State Key Laboratory of Molecular Engineering of Polymers
- Department of Macromolecular Science
- Fudan University
- Shanghai, China
| | - Huiping Wang
- State Key Laboratory of Molecular Engineering of Polymers
- Department of Macromolecular Science
- Fudan University
- Shanghai, China
| | - Tian Li
- State Key Laboratory of Molecular Engineering of Polymers
- Department of Macromolecular Science
- Fudan University
- Shanghai, China
| | - Zhuoyu Liu
- State Key Laboratory of Molecular Engineering of Polymers
- Department of Macromolecular Science
- Fudan University
- Shanghai, China
| | - Yingfeng Yu
- State Key Laboratory of Molecular Engineering of Polymers
- Department of Macromolecular Science
- Fudan University
- Shanghai, China
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17
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Li W, l'Abee RMA, Goossens JGP. The Control of Silica Nanoparticles on the Phase Separation of Poly(methyl methacrylate)/Poly(styrene-co-acrylonitrile) Blends. MACROMOL CHEM PHYS 2013. [DOI: 10.1002/macp.201300475] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Weizhen Li
- Laboratory of Polymer Materials, Faculty of Chemical; Engineering and Chemistry, Eindhoven University of Technology; Den Dolech 2 5612 AZ Eindhoven The Netherlands
- Department of Macromolecular Materials and Engineering, College of Chemistry and Chemical Engineering; Shanghai University of Engineering Science; 201620 Shanghai China
| | - Roy M. A. l'Abee
- Laboratory of Polymer Materials, Faculty of Chemical; Engineering and Chemistry, Eindhoven University of Technology; Den Dolech 2 5612 AZ Eindhoven The Netherlands
- SABIC Innovative Plastics; PO Box 117 4600 AC Bergen op Zoom The Netherlands
| | - Johannes G. P. Goossens
- Laboratory of Polymer Materials, Faculty of Chemical; Engineering and Chemistry, Eindhoven University of Technology; Den Dolech 2 5612 AZ Eindhoven The Netherlands
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18
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Gao J, Huang C, Wang N, Yu W, Zhou C. Phase separation of poly (methyl methacrylate) / poly (styrene-co-acrylonitrile) blends in the presence of silica nanoparticles. POLYMER 2012. [DOI: 10.1016/j.polymer.2012.02.027] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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19
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Strekalova EG, Mazza MG, Stanley HE, Franzese G. Hydrophobic nanoconfinement suppresses fluctuations in supercooled water. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2012; 24:064111. [PMID: 22277682 DOI: 10.1088/0953-8984/24/6/064111] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We perform very efficient Monte Carlo simulations to study the phase diagram of a water monolayer confined in a fixed disordered matrix of hydrophobic nanoparticles between two hydrophobic plates. We consider different hydrophobic nanoparticle concentrations c. We adopt a coarse-grained model of water that, for c = 0, displays a first-order liquid-liquid phase transition (LLPT) line with negative slope in the pressure-temperature (P-T) plane, ending in a liquid-liquid critical point at about 174 K and 0.13 GPa. We show that upon increase of c the liquid-gas spinodal and the temperature of the maximum density line are shifted with respect to the c = 0 case. We also find dramatic changes in the region around the LLPT. In particular, we observe a substantial (more than 90%) decrease of isothermal compressibility, thermal expansion coefficient and constant-pressure specific heat upon increasing c, consistent with recent experiments. Moreover, we find that a hydrophobic nanoparticle concentration as small as c = 2.4% is enough to destroy the LLPT for P ≥ 0.16 GPa. The fluctuations of volume apparently diverge at P ≈ 0.16 GPa, suggesting that the LLPT line ends in an LL critical point at 0.16 GPa. Therefore, nanoconfinement reduces the range of P-T where the LLPT is observable. By increasing the hydrophobic nanoparticle concentration c, the LLPT becomes weaker and its P-T range smaller. The model allows us to explain these phenomena in terms of a proliferation of interfaces among domains with different local order, promoted by the hydrophobic effect of the water-hydrophobic-nanoparticle interfaces.
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Affiliation(s)
- E G Strekalova
- Center for Polymer Studies and Department of Physics, Boston University, Boston, MA 02215, USA.
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20
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Chung HJ, Kim J, Ohno K, Composto RJ. Controlling the Location of Nanoparticles in Polymer Blends by Tuning the Length and End Group of Polymer Brushes. ACS Macro Lett 2012; 1:252-256. [PMID: 35578490 DOI: 10.1021/mz200068p] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This paper investigates controlling the location of nanoparticles (NPs) in a phase-separated polymer blend of deuterated poly(methyl methyl methacrylate) (dPMMA) and poly(styrene-ran-acrylonitrile) (SAN). Silica NPs are grafted with PMMA brushes having molecular weights of 1800, 21000, and 160000 at fixed grafting density. Using ion beam milling combined with SEM imaging, NP location and morphology are investigated for blends containing 10 wt % NP. With increasing brush length, the NPs are found to segregate to the dPMMA/SAN interface, partition between the interface and dPMMA phase, or locate in the dPMMA phase, respectively.
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Affiliation(s)
- Hyun-Joong Chung
- Department of Materials Science
and Engineering and Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, Pennsylvania
19104-6272, United States
| | - Jinyong Kim
- Department of Materials Science
and Engineering and Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, Pennsylvania
19104-6272, United States
| | - Kohji Ohno
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Russell J. Composto
- Department of Materials Science
and Engineering and Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, Pennsylvania
19104-6272, United States
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21
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Fischer T, Vink RLC. Domain formation in membranes with quenched protein obstacles: Lateral heterogeneity and the connection to universality classes. J Chem Phys 2011; 134:055106. [DOI: 10.1063/1.3530587] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
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22
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Hui S, Chaki TK, Chattopadhyay S. Effect of silica-based nanofillers on the properties of a low-density polyethylene/ethylene vinyl acetate copolymer based thermoplastic elastomer. J Appl Polym Sci 2008. [DOI: 10.1002/app.28537] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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23
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Torrens F, Gómez CM, León LM, Abad C, Campos A. Modeling Studies of the Phase Behavior of Monomer/Polymer/Disk Composites. MACROMOL THEOR SIMUL 2008. [DOI: 10.1002/mats.200800013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Paul R, Karabiyik U, Swift MC, Esker AR. Phase separation in poly(tert-butyl acrylate)/polyhedral oligomeric silsesquioxane (POSS) thin film blends. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:5079-5090. [PMID: 18399687 DOI: 10.1021/la702065z] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Phase separation in thin film blends of poly(tert-butyl acrylate) (PtBA) and a polyhedral oligomeric silsesquioxane (POSS), trisilanolphenyl-POSS (TPP), is studied as functions of annealing temperature and time, using reflected light optical microscopy, atomic force microscopy, and X-ray photoelectron spectroscopy. The results demonstrate that the PtBA/TPP blend system confined to thin films ( approximately 90 nm) exhibits lower critical solution temperature (LCST) behavior with a critical temperature of approximately 70 degrees C and a critical composition of 60 wt % PtBA with insignificant dewetting at the phase boundary. Off-critical spinodal behavior is observed for 58 and 62 wt % PtBA blend films. Phase separation by nucleation and growth is observed for all compositions outside the window between 58 and 62 wt % PtBA. The temporal evolution of spinodal decomposition in 60 wt % PtBA blend films is explored at annealing temperatures of 75, 85, 95, and 105 degrees C. The morphological evolution in 60 wt % PtBA blend films is similar for all experimental temperatures (75, 85, 95, and 105 degrees C) with the expected shorter time scales for phase evolution at higher annealing temperatures. Fast Fourier transforms of optical micrographs reveal that these blend films immediately undergo phase separation by spinodal decomposition during temperature jump experiments. Power law scaling for the characteristic wavevector with time (q approximately t(n) with n approximately -1/4 to -1/3) for domain growth during the early stages of phase separation yields to domain pinning at the later stages for 60 wt % PtBA blend films annealed at 75, 85, and 95 degrees C. In contrast, domain growth is pinned over the entire experimental time scale for 60 wt % PtBA blend films annealed at 105 degrees C.
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Affiliation(s)
- Rituparna Paul
- Macromolecules and Interfaces Institute and Department of Chemistry, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA
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Clegg PS. Fluid-bicontinuous gels stabilized by interfacial colloids: low and high molecular weight fluids. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2008; 20:113101. [PMID: 21694193 DOI: 10.1088/0953-8984/20/11/113101] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Carefully tuned composite materials can have properties wholly unlike those of their separate constituents. We review the development of one example: colloid-stabilized emulsions with bicontinuous liquid domains. These non-equilibrium structures resemble the sponge mesophase of surfactants; however, in the colloid-stabilized case the interface separating the liquid domains is itself semi-solid. The arrangement of domains is created by arresting liquid-liquid phase separation via spinodal decomposition. Dispersed colloids exhibiting partial wettability become trapped on the newly created interface and jam together as the domains coarsen. Similar structures have been created in polymer blends stabilized using either interfacial nanoparticles or clay platelets. Here it has been possible to create the domain arrangement either by phase separation or by direct mixing of the melt. The low molecular weight liquid and polymer based structures have been developed independently and much can be learnt by comparing the two.
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Affiliation(s)
- P S Clegg
- SUPA School of Physics, University of Edinburgh, Edinburgh EH9 3JZ, UK
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Hore MJA, Laradji M. Prospects of nanorods as an emulsifying agent of immiscible blends. J Chem Phys 2008; 128:054901. [DOI: 10.1063/1.2826322] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Hore MJA, Laradji M. Microphase separation induced by interfacial segregation of isotropic, spherical nanoparticles. J Chem Phys 2007; 126:244903. [PMID: 17614586 DOI: 10.1063/1.2746862] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
In a recent experiment by Chung et al. [Nano Lett. 5, 1878 (2005)] and simulation by Stratford et al. [Science 309, 2198 (2005)] on immiscible blends containing nanoscale particles, it was shown that the phase separation of the two polymers can be prevented as a result of the aggregation of the nanoparticles at the interfaces between the two polymers. Motivated by these studies, we performed large scale systematic simulations, based on the dissipative particle dynamics approach, on immiscible binary (A-B) fluids containing moderate volume fractions of isotropic nanoscale spherical particles N. The nanoparticles preferentially segregate at the interfaces between the two fluids if the pairwise interactions between the three components are such that chi(AB)>/chi(AN)-chi(BN)/. We find that at later times, the average domain size saturates to a value, L approximately R(N)/phi(N), where R(N) and phi(N) are the radius and volume fraction of the nanoparticles, respectively. For small nanoparticles, however, full phase separation is observed.
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Affiliation(s)
- Michael J A Hore
- Department of Physics, The University of Memphis, Memphis, Tennessee 38152, USA
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28
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Araki T, Tanaka H. Wetting-induced depletion interaction between particles in a phase-separating liquid mixture. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2006; 73:061506. [PMID: 16906835 DOI: 10.1103/physreve.73.061506] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2005] [Revised: 02/17/2006] [Indexed: 05/11/2023]
Abstract
Inclusion of solid particles drastically affects the pattern evolution of phase separation of a binary fluid mixture, via preferential wetting of one of the phases to the particles. Here we study this problem by numerical simulation, which incorporates interparticle hydrodynamic interactions properly. When particles favor one of the components of a mixture, wetting layers are quickly formed on the particle surfaces and all particles are eventually included into the more wettable phase. For immobile particles, domains of the more wettable phase are pinned to the particles and the domain growth is thus suppressed. For this case, the domain size at a certain phase-separation time decreases monotonically with increasing the particle concentration. For mobile particles, on the other hand, the reentrant morphological transformation is observed as a function of the particle concentration: With an increase in the particle concentration, the domain morphology of the more wettable phase sequentially changes from network, droplet to network. We found that the final morphological transition is induced by wetting-induced depletion interaction: strong attractive interactions act among particles when the total volume of the more wettable phase is not enough to cover all the particles by wetting layers.
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Affiliation(s)
- Takeaki Araki
- Institute of Industrial Science, University of Tokyo, Meguro-ku, Tokyo 153-8505, Japan
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29
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He G, Ginzburg VV, Balazs AC. Determining the phase behavior of nanoparticle-filled binary blends. ACTA ACUST UNITED AC 2006. [DOI: 10.1002/polb.20887] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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30
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The influence of nanoparticle fillers on the morphology of a spin-cast thin film polymer blend. Colloid Polym Sci 2005. [DOI: 10.1007/s00396-005-1406-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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31
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Chung HJ, Ohno K, Fukuda T, Composto RJ. Self-regulated structures in nanocomposites by directed nanoparticle assembly. NANO LETTERS 2005; 5:1878-82. [PMID: 16218702 DOI: 10.1021/nl051079e] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Adding surface-modified silica nanoparticles (NPs) to polymer blend films, we demonstrate that directed interfacial segregation of NPs stabilize either three-dimensional (3D) interpenetrating or 2D discrete structures at high and low volume fractions of NPs, respectively. A simple interfacial energy argument provides a general guideline for predicting whether the NPs are directed to the interface between phases or into one phase. The final morphology and domain size can be predicted from the volume fraction of NPs, film thickness, and NP size.
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Affiliation(s)
- Hyun-joong Chung
- Materials Science and Engineering and Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, PA 19104-6272, USA
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32
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Ginzburg VV. Influence of Nanoparticles on Miscibility of Polymer Blends. A Simple Theory. Macromolecules 2005. [DOI: 10.1021/ma0482821] [Citation(s) in RCA: 199] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Valeriy V. Ginzburg
- The Dow Chemical Company, Physical Sciences Group, Building 1702, Midland Michigan 48674
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Laradji M, Hore MJA. Nanospheres in phase-separating multicomponent fluids: A three-dimensional dissipative particle dynamics simulation. J Chem Phys 2004; 121:10641-7. [PMID: 15549947 DOI: 10.1063/1.1806815] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The dynamics of phase separation of three-dimensional fluids containing nanospheres, which interact preferentially with one of the two fluids, is studied by means of large-scale dissipative particle dynamics simulations. We systematically investigated the effect of volume fraction, radius, and mass of the nanoparticles on both kinetics and morphology of the binary mixture. We found that nanospheres lead to a reduction of domain growth which is intensified as their volume fraction is increased for a given radius of nanoparticles, or as the nanoparticles radius is decreased for a given volume fraction. Up to moderate volume fractions of nanoparticles, the growth law, however, is found to be identical to that pure binary fluids, i.e., R(t) approximately t(n), with n=1. For relatively high volume fractions of nanoparticles, a diffusive growth regime was detected. The crossover to the slower growth regime as the nanoparticles volume fraction is increased or their radius is decreased is associated with the crystallization of the nanospheres within the preferred component. These results are qualitatively in good agreement with previous two-dimensional simulations using molecular dynamics [M. Laradji and G. MacNevin, J. Chem. Phys. 119, 2275 (2003)] and a time-dependent Ginzburg-Landau model [M. Laradji, J. Chem. Phys. 120, 9330 (2004)], as well as recent experiments.
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Affiliation(s)
- Mohamed Laradji
- Department of Physics, The University of Memphis, Memphis, TN 38152-3390, USA.
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Minelli C, Geissbuehler I, Eckert R, Vogel H, Heinzelmann H, Liley M. Organization of nanoscale objects via polymer demixing. Colloid Polym Sci 2004. [DOI: 10.1007/s00396-004-1070-y] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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35
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Laradji M. A Langevin dynamics study of mobile filler particles in phase-separating binary systems. J Chem Phys 2004; 120:9330-4. [PMID: 15267870 DOI: 10.1063/1.1704636] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The dynamics of phase separation in a simple binary mixture containing mobile filler particles that are preferentially wet by one of the two components is investigated systematically via Langevin simulations in two dimensions. We found that while the filler particles reduce the growth rate of spinodal decomposition, the domain growth remains essentially identical to that of the pure binary mixture. The growth rate diminishes as either the filler particles concentration is increased or their diffusivity is decreased.
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Affiliation(s)
- Mohamed Laradji
- Department of Physics, The University of Memphis, Memphis, Tennessee 38152, USA.
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