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Kotkar SB, Howard MP, Nikoubashman A, Conrad JC, Poling-Skutvik R, Palmer JC. Confined Dynamics in Spherical Polymer Brushes. ACS Macro Lett 2023; 12:1503-1509. [PMID: 37879104 DOI: 10.1021/acsmacrolett.3c00505] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2023]
Abstract
We investigate the dynamics of polymers grafted to spherical nanoparticles in solution using hybrid molecular dynamics simulations with a coarse-grained solvent modeled via the multiparticle collision dynamics algorithm. The mean-square displacements of monomers near the surface of the nanoparticle exhibit a plateau on intermediate time scales, indicating confined dynamics reminiscent of those reported in neutron spin-echo experiments. The confined dynamics vanish beyond a specific radial distance from the nanoparticle surface that depends on the polymer grafting density. We show that this dynamical confinement transition follows theoretical predictions for the critical distance associated with the structural transition from confined to semidilute brush regimes. These findings suggest the existence of a hitherto unreported dynamic length scale connected with theoretically predicted static fluctuations in spherical polymer brushes and provide new insights into recent experimental observations.
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Affiliation(s)
- Shivraj B Kotkar
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204, United States
| | - Michael P Howard
- Department of Chemical Engineering, Auburn University, Auburn, Alabama 36849, United States
| | - Arash Nikoubashman
- Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, 01069 Dresden, Germany
- Institut für Theoretische Physik, Technische Universität Dresden, 01069 Dresden, Germany
| | - Jacinta C Conrad
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204, United States
| | - Ryan Poling-Skutvik
- Department of Chemical Engineering, University of Rhode Island, Kingston, Rhode Island 02881, United States
| | - Jeremy C Palmer
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204, United States
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2
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Characterization of Monte Carlo Dynamic/Kinetic Properties of Local Structure in Bond Fluctuation Model of Polymer System. MATERIALS 2021; 14:ma14174962. [PMID: 34501051 PMCID: PMC8433752 DOI: 10.3390/ma14174962] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Revised: 08/19/2021] [Accepted: 08/25/2021] [Indexed: 11/19/2022]
Abstract
We report the results of the characterization of local Monte Carlo (MC) dynamics of an equilibrium bond fluctuation model polymer matrix (BFM), in time interval typical for MC simulations of non-linear optical phenomena in host-guest systems. The study contributes to the physical picture of the dynamical aspects of quasi-binary mosaic states characterized previously in the static regime. The polymer dynamics was studied at three temperatures (below, above and close to the glass transition), using time-dependent generalization of the static parameters which characterize local free volume and local mobility of the matrix. Those parameters play the central role in the kinetic MC model of host-guest systems. The analysis was done in terms of the probability distributions of instantaneous and time-averaged local parameters. The main result is the characterization of time scales characteristic of various local structural processes. Slowing down effects close to the glass transition are clearly marked. The approach yields an elegant geometric criterion for the glass transition temperature. A simplified quantitative physical picture of the dynamics of guest molecules dispersed in BFM matrix at low temperatures offers a starting point for stochastic modeling of host-guest systems.
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Hałagan K, Banaszak M, Jung J, Polanowski P, Sikorski A. Dynamics of Opposing Polymer Brushes: A Computer Simulation Study. Polymers (Basel) 2021; 13:2758. [PMID: 34451296 PMCID: PMC8398710 DOI: 10.3390/polym13162758] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2021] [Revised: 08/12/2021] [Accepted: 08/14/2021] [Indexed: 01/16/2023] Open
Abstract
Opposing polymer brush systems were synthesized and investigated by molecular modeling. Chains were restricted to a face-centered cubic lattice with the excluded volume interactions only. The system was confined between two parallel impenetrable walls, with the same number of chains grafted to each surface. The dynamic properties of such systems were studied by Monte Carlo simulations based on the dynamic lattice liquid model and using a highly efficient parallel machine ARUZ, which enabled the study of large systems and long timescales. The influence of the surface density and mean polymer length on the system dynamic was discussed. The self-diffusion coefficient of the solvent depended strongly on the degree of polymerization and on the polymer concentration. It was also shown that it is possible to capture changes in solvent mobility that can be attributed to the regions of different polymer densities.
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Affiliation(s)
- Krzysztof Hałagan
- Department of Molecular Physics, Lodz University of Technology, Zeromskiego 116, 90924 Lodz, Poland; (J.J.); (P.P.)
| | - Michał Banaszak
- Faculty of Physics, Adam Mickiewicz University, Uniwersytetu Poznanskiego 2, 61614 Poznan, Poland;
- NanoBiomedical Centre, Adam Mickiewicz University, Wszechnicy Piastowskiej 3, 61614 Poznan, Poland
| | - Jarosław Jung
- Department of Molecular Physics, Lodz University of Technology, Zeromskiego 116, 90924 Lodz, Poland; (J.J.); (P.P.)
| | - Piotr Polanowski
- Department of Molecular Physics, Lodz University of Technology, Zeromskiego 116, 90924 Lodz, Poland; (J.J.); (P.P.)
| | - Andrzej Sikorski
- Faculty of Chemistry, University of Warsaw, Pasteura 1, 02093 Warsaw, Poland;
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4
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Mitus AC, Saphiannikova M, Radosz W, Toshchevikov V, Pawlik G. Modeling of Nonlinear Optical Phenomena in Host-Guest Systems Using Bond Fluctuation Monte Carlo Model: A Review. MATERIALS (BASEL, SWITZERLAND) 2021; 14:1454. [PMID: 33809785 PMCID: PMC8002275 DOI: 10.3390/ma14061454] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/21/2021] [Revised: 03/05/2021] [Accepted: 03/08/2021] [Indexed: 12/14/2022]
Abstract
We review the results of Monte Carlo studies of chosen nonlinear optical effects in host-guest systems, using methods based on the bond-fluctuation model (BFM) for a polymer matrix. In particular, we simulate the inscription of various types of diffraction gratings in degenerate two wave mixing (DTWM) experiments (surface relief gratings (SRG), gratings in polymers doped with azo-dye molecules and gratings in biopolymers), poling effects (electric field poling of dipolar molecules and all-optical poling) and photomechanical effect. All these processes are characterized in terms of parameters measured in experiments, such as diffraction efficiency, nonlinear susceptibilities, density profiles or loading parameters. Local free volume in the BFM matrix, characterized by probabilistic distributions and correlation functions, displays a complex mosaic-like structure of scale-free clusters, which are thought to be responsible for heterogeneous dynamics of nonlinear optical processes. The photoinduced dynamics of single azopolymer chains, studied in two and three dimensions, displays complex sub-diffusive, diffusive and super-diffusive dynamical regimes. A directly related mathematical model of SRG inscription, based on the continuous time random walk (CTRW) formalism, is formulated and studied. Theoretical part of the review is devoted to the justification of the a priori assumptions made in the BFM modeling of photoinduced motion of the azo-polymer chains.
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Affiliation(s)
- Antoni C. Mitus
- Department of Theoretical Physics, Wroclaw University of Science and Technology, 50-370 Wroclaw, Poland; (A.C.M.); (W.R.)
| | - Marina Saphiannikova
- Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Strasse 6, 01069 Dresden, Germany;
| | - Wojciech Radosz
- Department of Theoretical Physics, Wroclaw University of Science and Technology, 50-370 Wroclaw, Poland; (A.C.M.); (W.R.)
| | - Vladimir Toshchevikov
- Institute of Macromolecular Compounds, Russian Academy of Sciences, Bolshoi Prospect 31, 199004 Saint Petersburg, Russia;
| | - Grzegorz Pawlik
- Department of Theoretical Physics, Wroclaw University of Science and Technology, 50-370 Wroclaw, Poland; (A.C.M.); (W.R.)
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5
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Polanowski P, Jeszka JK, Matyjaszewski K. Polymer brush relaxation during and after polymerization – Monte Carlo simulation study. POLYMER 2019. [DOI: 10.1016/j.polymer.2019.04.023] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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6
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A grazing incidence neutron spin echo study of near surface dynamics in p(MEO2MA-co-OEGMA) copolymer brushes. Colloid Polym Sci 2018. [DOI: 10.1007/s00396-018-4421-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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7
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Boon N. Efficient configurational-bias Monte-Carlo simulations of chain molecules with "swarms" of trial configurations. J Chem Phys 2018; 149:064109. [PMID: 30111122 DOI: 10.1063/1.5029566] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
The pruned-enriched Rosenbluth method (PERM) is a popular and powerful Monte-Carlo technique for sampling flexible chain polymers of substantial length. In its original form, however, the method cannot be applied in Markov-chain Monte-Carlo schemes, which has rendered PERM unsuited for systems that consist of many chains. The current work builds on the configurational-bias Monte-Carlo (CBMC) method. The growth of a large set of trial configurations in each move is governed by simultaneous pruning and enrichment events, which tend to replace configurations with a low statistical weight by clones of stronger configurations. In simulations of dense brushes of flexible chains, a gain in efficiency of at least three orders of magnitude is observed with respect to CBMC and one order of magnitude with respect to recoil-growth approaches. Moreover, meaningful statistics can be collected from all trial configurations through the so-called "waste-recycling" Monte Carlo scheme.
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Affiliation(s)
- Niels Boon
- Division of Physical Chemistry, Department of Chemistry, Lund University, SE-22100 Lund, Sweden
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Poling-Skutvik R, Olafson KN, Narayanan S, Stingaciu L, Faraone A, Conrad JC, Krishnamoorti R. Confined Dynamics of Grafted Polymer Chains in Solutions of Linear Polymer. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b01245] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Ryan Poling-Skutvik
- Department
of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204, United States
| | - Katy N. Olafson
- Department
of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204, United States
| | - Suresh Narayanan
- Advanced
Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Laura Stingaciu
- Jülich
Centre for Neutron Science JCNS, Forschungszentrum Jülich GmbH,
Outstation at SNS, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Antonio Faraone
- National
Institute
of Standards and Technology Center for Neutron Research, Gaithersburg, Maryland 20899, United States
| | - Jacinta C. Conrad
- Department
of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204, United States
| | - Ramanan Krishnamoorti
- Department
of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204, United States
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9
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Affiliation(s)
- Jack Kirk
- School of Mathematical,
Physical
and Computational Sciences, University of Reading, Reading RG6 6AX, U.K
| | - Patrick Ilg
- School of Mathematical,
Physical
and Computational Sciences, University of Reading, Reading RG6 6AX, U.K
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10
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Korolkovas A, Rodriguez-Emmenegger C, de los Santos Pereira A, Chennevière A, Restagno F, Wolff M, Adlmann FA, Dennison AJC, Gutfreund P. Polymer Brush Collapse under Shear Flow. Macromolecules 2017. [DOI: 10.1021/acs.macromol.6b02525] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Airidas Korolkovas
- Institut Laue-Langevin, 71 rue des Martyrs, 38000 Grenoble, France
- Université
Grenoble Alpes, Liphy, 140 Rue de la
Physique, 38402 Saint-Martin-d’Hères, France
| | - Cesar Rodriguez-Emmenegger
- DWI
- Leibniz Institute for Interactive Materials and Institute of Technical
and Macromolecular Chemistry, RWTH Aachen University, Forckenbeckstraße
50, 52074 Aachen, Germany
| | - Andres de los Santos Pereira
- Institute
of Macromolecular Chemistry, Academy of Sciences of the Czech Republic v.v.i., Heyrovsky Sq. 2, 162 06 Prague, Czech Republic
| | - Alexis Chennevière
- Laboratoire
Léon Brillouin, CEA, CNRS, Université Paris-Saclay, Saclay, 91191 Gif-sur-Yvette, Cedex, France
| | - Frédéric Restagno
- Laboratoire
de Physique des Solides, CNRS, Univ. Paris-Sud, Université Paris-Saclay, 91405 Orsay, Cedex, France
| | - Maximilian Wolff
- Division
for Material Physics, Department for Physics and Astronomy, Uppsala University, Box
516, 75120 Uppsala, Sweden
| | - Franz A. Adlmann
- Division
for Material Physics, Department for Physics and Astronomy, Uppsala University, Box
516, 75120 Uppsala, Sweden
| | - Andrew J. C. Dennison
- Institut Laue-Langevin, 71 rue des Martyrs, 38000 Grenoble, France
- Department
of Chemistry, Technical University Berlin, 10623 Berlin, Germany
- Department
of Physics and Astronomy, University of Sheffield, S10 2TN Sheffield, U.K
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11
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Qi S, Klushin LI, Skvortsov AM, Schmid F. Polydisperse Polymer Brushes: Internal Structure, Critical Behavior, and Interaction with Flow. Macromolecules 2016. [DOI: 10.1021/acs.macromol.6b02026] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Shuanhu Qi
- Institut für Physik, Johannes Gutenberg-Universität Mainz, Staudingerweg 7, D-55099 Mainz, Germany
| | - Leonid I. Klushin
- Department of Physics, American University of Beirut, P.O. Box 11-0236, Beirut 1107 2020, Lebanon
| | | | - Friederike Schmid
- Institut für Physik, Johannes Gutenberg-Universität Mainz, Staudingerweg
7, D-55099 Mainz, Germany
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