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Karatasos K, Kritikos G. A microscopic view of graphene-oxide/poly(acrylic acid) physical hydrogels: effects of polymer charge and graphene oxide loading. SOFT MATTER 2018; 14:614-627. [PMID: 29265164 DOI: 10.1039/c7sm02305g] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In this work we have examined in detail by means of fully atomistic molecular dynamics simulations, physical hydrogels formed by a polymer electrolyte, poly(acrylic acid), and graphene oxide, at two different charging states of the polymer and two different graphene oxide concentrations. It was found that variations of these parameters incurred drastic changes in general morphological characteristics of the composite materials, the degree of physical adsorption of polyelectrolyte chains onto the graphene oxide surface, the polymer dynamic response at local and global length scales, in the charge distributions around the components, and in the mobility of the counterions. All these microscopic features are expected to significantly affect macroscopic physical properties of the hydrogels, such as their mechanical responses and their electrical behaviors.
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Affiliation(s)
- Kostas Karatasos
- Laboratory of Physical Chemistry, Department of Chemical Engineering, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
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2
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Lyulin SV. Correlation between overcharging peculiarities and the solubility of interpolyelectrolyte complexes. Chem Phys Lett 2017. [DOI: 10.1016/j.cplett.2016.11.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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3
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Wawrzyńska E, Sikorski A, Zifferer G. Monte Carlo Simulation Studies of Regular and Irregular Dendritic Polymers. MACROMOL THEOR SIMUL 2015. [DOI: 10.1002/mats.201500036] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Edyta Wawrzyńska
- Department of Physical Chemistry; University of Vienna; Währinger Str. 42 A-1090 Vienna Austria
- Faculty of Chemistry; Warsaw University of Technology; Noakowskiego 3 00-664 Warsaw Poland
- Faculty of Chemistry; University of Warsaw; Pasteura 1 02-093 Warsaw Poland
| | - Andrzej Sikorski
- Faculty of Chemistry; University of Warsaw; Pasteura 1 02-093 Warsaw Poland
| | - Gerhard Zifferer
- Department of Physical Chemistry; University of Vienna; Währinger Str. 42 A-1090 Vienna Austria
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4
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Qamhieh K, Khaleel AA. Analytical model study of complexation of dendrimer as an ion penetrable sphere with DNA. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2013.01.047] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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5
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Cao Q, Bachmann M. Electrostatic complexation of linear polyelectrolytes with soft spherical nanoparticles. Chem Phys Lett 2013. [DOI: 10.1016/j.cplett.2013.09.014] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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6
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Kłos JS, Sommer JU. Coarse grained simulations of neutral and charged dendrimers. POLYMER SCIENCE SERIES C 2013. [DOI: 10.1134/s1811238213070023] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Eleftheriou E, Karatasos K. Modeling the formation of ordered nano-assemblies comprised by dendrimers and linear polyelectrolytes: the role of Coulombic interactions. J Chem Phys 2013; 137:144905. [PMID: 23061863 DOI: 10.1063/1.4757666] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Models of mixtures of peripherally charged dendrimers with oppositely charged linear polyelectrolytes in the presence of explicit solvent are studied by means of molecular dynamics simulations. Under the influence of varying strength of electrostatic interactions, these systems appear to form dynamically arrested film-like interconnected structures in the polymer-rich phase. Acting like a pseudo-thermodynamic inverse temperature, the increase of the strength of the Coulombic interactions drive the polymeric constituents of the mixture to a gradual dynamic freezing-in. The timescale of the average density fluctuations of the formed complexes initially increases in the weak electrostatic regime reaching a finite limit as the strength of electrostatic interactions grow. Although the models are overall electrically neutral, during this process the dendrimer/linear complexes develop a polar character with an excess charge mainly close to the periphery of the dendrimers. The morphological characteristics of the resulted pattern are found to depend on the size of the polymer chains on account of the distinct conformational features assumed by the complexed linear polyelectrolytes of different length. In addition, the length of the polymer chain appears to affect the dynamics of the counterions, thus affecting the ionic transport properties of the system. It appears, therefore, that the strength of electrostatic interactions together with the length of the linear polyelectrolytes are parameters to which these systems are particularly responsive, offering thus the possibility for a better control of the resulted structure and the electric properties of these soft-colloidal systems.
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Affiliation(s)
- E Eleftheriou
- Physical Chemistry Laboratory, Chemical Engineering Department, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
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8
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Kłos JS, Sommer JU. Simulation of Complexes between a Charged Dendrimer and a Linear Polyelectrolyte with Finite Rigidity. MACROMOL THEOR SIMUL 2012. [DOI: 10.1002/mats.201100120] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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9
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Conformational Effects in Non-Stoichiometric Complexes of Two Hyperbranched Molecules with a Linear Polyelectrolyte. Polymers (Basel) 2012. [DOI: 10.3390/polym4010240] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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10
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Lyulin SV, Reshetnikov EV, Darinskii AA, Lyulin AV. Structural behavior of hyperbranched polymers in solvents of various qualities: Brownian dynamics simulation. POLYMER SCIENCE SERIES A 2011. [DOI: 10.1134/s0965545x11090082] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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11
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Markelov DA, Matveev VV, Ingman P, Lähderanta E, Boiko NI. Average relaxation time of internal spectrum for carbosilane dendrimers: nuclear magnetic resonance studies. J Chem Phys 2011; 135:124901. [PMID: 21974558 DOI: 10.1063/1.3638177] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A new theoretical description of the interior mobility of carbosilane dendrimers has been tested. Experiments were conducted using measurements of the (1)H NMR spin-lattice relaxation time, T(1H), of two-, three- and four-generation carbosilane dendrimers with three different types of terminal groups in dilute chloroform solutions. Temperature dependences of the NMR relaxation rate, 1/T(1H), were obtained for the internal CH(2)-groups of the dendrimers in the range of 1/T(1H) maximum, allowing us to directly evaluate the average time of the internal spectrum for each dendrimer. It was found that the temperature of 1/T(1H) maximum is practically independent of the number of generations, G; therefore, the theoretical prediction was confirmed experimentally. In addition, the average time of the internal spectrum of carbosilane dendrimers was found to be near 0.2 ns at room temperature, and this value correlates well with the values previously obtained for other dendrimer structures using other experimental techniques.
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Affiliation(s)
- Denis A Markelov
- Laboratory of Physics, Lappeenranta University of Technology, Box 20, 53851 Lappeenranta, Finland.
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12
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Kłos JS, Sommer JU. Monte Carlo simulations of charged dendrimer-linear polyelectrolyte complexes and explicit counterions. J Chem Phys 2011; 134:204902. [PMID: 21639472 DOI: 10.1063/1.3592558] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We study complexes composed of one dendrimer of generation G = 4 (G4 dendrimer) with N(t) = 32 charged terminal groups and an oppositely charged linear polyelectrolyte accompanied by neutralizing counterions in an athermal solvent using Monte Carlo simulations based on the bond fluctuation model. In our study both the full Coulomb potential and the excluded volume interactions are taken into account explicitly with the reduced temperature τ and the chain length N(ch) as the main simulation parameters. Our calculations indicate that there exist three temperature ranges that determine the behavior of such complexes. At τ(complex) stable charged dendrimer-linear polyelectrolyte complexes are formed first, which are subsequently accompanied by selective counterion localization within the complex interior at τ(loc) ≤ τ(complex), and counterion condensation as temperature is further decreased below τ(cond) < τ(loc). In particular, we observe that condensation takes place exclusively on the excess charges in the complex and thus no condensation is observed at the compensation point (N(ch) = N(t)), irrespective of τ. For N(ch) ≠ N(t) the complex is overally charged. Furthermore, we discuss the size and structure of the dendrimer and the linear polyelectrolyte within the complex, as well as spatial distributions of monomers and counterions. Conformations of the chain in the bound state are analysed in terms of loops, trains, and tails.
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Affiliation(s)
- J S Kłos
- Leibniz Institute of Polymer Research Dresden e.V., 01069 Dresden, Germany.
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Kłos JS, Sommer JU. Simulations of Dendrimers with Flexible Spacer Chains and Explicit Counterions under Low and Neutral pH Conditions. Macromolecules 2010. [DOI: 10.1021/ma102055w] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- J. S. Kłos
- Leibniz Institute of Polymer Research Dresden e. V., 01069 Dresden, Germany
- Faculty of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland
| | - J.-U. Sommer
- Leibniz Institute of Polymer Research Dresden e. V., 01069 Dresden, Germany
- Institute for Theoretical Physics, Technische Universität Dresden, 01069 Dresden, Germany
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Larin SV, Darinskii AA, Lyulin AV, Lyulin SV. Linker Formation in an Overcharged Complex of Two Dendrimers and Linear Polyelectrolyte. J Phys Chem B 2010; 114:2910-9. [DOI: 10.1021/jp908196t] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sergey V. Larin
- Institute of Macromolecular Compounds, Russian Academy of Sciences, Bolshoj pr., d. 31, St. Petersburg, Russia, Laboratory of Polymer Chemistry, University of Helsinki, Helsinki, Finland, Group Theory of Polymers and Soft Matter, Technische Universiteit Eindhoven, P.O. Box 513, 5600 MB Eindhoven, The Netherlands, and Dutch Polymer Institute, P.O. Box 902, 5600 AX Eindhoven, The Netherlands
| | - Anatolii A. Darinskii
- Institute of Macromolecular Compounds, Russian Academy of Sciences, Bolshoj pr., d. 31, St. Petersburg, Russia, Laboratory of Polymer Chemistry, University of Helsinki, Helsinki, Finland, Group Theory of Polymers and Soft Matter, Technische Universiteit Eindhoven, P.O. Box 513, 5600 MB Eindhoven, The Netherlands, and Dutch Polymer Institute, P.O. Box 902, 5600 AX Eindhoven, The Netherlands
| | - Alexey V. Lyulin
- Institute of Macromolecular Compounds, Russian Academy of Sciences, Bolshoj pr., d. 31, St. Petersburg, Russia, Laboratory of Polymer Chemistry, University of Helsinki, Helsinki, Finland, Group Theory of Polymers and Soft Matter, Technische Universiteit Eindhoven, P.O. Box 513, 5600 MB Eindhoven, The Netherlands, and Dutch Polymer Institute, P.O. Box 902, 5600 AX Eindhoven, The Netherlands
| | - Sergey V. Lyulin
- Institute of Macromolecular Compounds, Russian Academy of Sciences, Bolshoj pr., d. 31, St. Petersburg, Russia, Laboratory of Polymer Chemistry, University of Helsinki, Helsinki, Finland, Group Theory of Polymers and Soft Matter, Technische Universiteit Eindhoven, P.O. Box 513, 5600 MB Eindhoven, The Netherlands, and Dutch Polymer Institute, P.O. Box 902, 5600 AX Eindhoven, The Netherlands
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15
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Tian WD, Ma YQ. Complexation of a Linear Polyelectrolyte with a Charged Dendrimer: Polyelectrolyte Stiffness Effects. Macromolecules 2010. [DOI: 10.1021/ma901988m] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Wen-de Tian
- National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China
| | - Yu-qiang Ma
- National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China
- Laboratory of Soft Condensed Matter Physics and Interdisciplinary Research, Soochow University, Suzhou 215006, China
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Qamhieh K, Nylander T, Ainalem ML. Analytical Model Study of Dendrimer/DNA Complexes. Biomacromolecules 2009; 10:1720-6. [DOI: 10.1021/bm9000662] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Khawla Qamhieh
- Physical Chemistry, Center for Chemistry and Chemical Engineering, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden
| | - Tommy Nylander
- Physical Chemistry, Center for Chemistry and Chemical Engineering, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden
| | - Marie-Louise Ainalem
- Physical Chemistry, Center for Chemistry and Chemical Engineering, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden
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Ge Z, Wang D, Zhou Y, Liu H, Liu S. Synthesis of Organic/Inorganic Hybrid Quatrefoil-Shaped Star-Cyclic Polymer Containing a Polyhedral Oligomeric Silsesquioxane Core. Macromolecules 2009. [DOI: 10.1021/ma802585k] [Citation(s) in RCA: 109] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Zhishen Ge
- CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Di Wang
- CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Yueming Zhou
- CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Hewen Liu
- CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Shiyong Liu
- CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China
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Tanis I, Karatasos K. Molecular dynamics simulations of polyamidoamine dendrimers and their complexes with linear poly(ethylene oxide) at different pH conditions: static properties and hydrogen bonding. Phys Chem Chem Phys 2009; 11:10017-28. [DOI: 10.1039/b913986a] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Lyulin SV, Darinskii AA, Lyulin AV. Energetic and conformational aspects of dendrimer overcharging by linear polyelectrolytes. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2008; 78:041801. [PMID: 18999446 DOI: 10.1103/physreve.78.041801] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2008] [Indexed: 05/27/2023]
Abstract
Extensive Brownian dynamics simulations of conformational changes accompanying the overcharging of a dendrimer by an oppositely charged long linear polyelectrolyte (LPE) have been carried out. The simulated results have been compared with the predictions of the Nguen and Shklovskii correlation theory [Physica A 293, 324 (2001)] for impenetrable charged spherical macroion. Dendrimer overcharging is caused by the spatial correlations between the "excess" of the LPE charges adsorbed onto its surface. The simulated LPE-length dependence of the corresponding "correlation" energy is in agreement with the theoretical predictions. Maximum of the LPE adsorption occurs at some critical LPE length N{ch};{c} , and the first order phase transition from completely coiled conformation to the conformation with released tails takes place. The phase transition is accompanied by the drastic increase in the relative fluctuations of the polyelectrolyte size. Upon increasing the linear-chain length above N{ch};{c} , the one-long-tail conformation becomes energetically preferable; the exchange time between the long-tail conformation and the short-tail conformation is very large.
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Affiliation(s)
- Sergey V Lyulin
- Institute of Macromolecular Compounds, Russian Academy of Sciences, Bolshoj Prospect 31, St. Petersburg, 199004, Russia.
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Dalakoglou GK, Karatasos K, Lyulin SV, Lyulin AV. Shear-induced effects in hyperbranched-linear polyelectrolyte complexes. J Chem Phys 2008; 129:034901. [DOI: 10.1063/1.2952518] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Lyulin SV, Vattulainen I, Gurtovenko AA. Complexes Comprised of Charged Dendrimers, Linear Polyelectrolytes, and Counterions: Insight through Coarse-Grained Molecular Dynamics Simulations. Macromolecules 2008. [DOI: 10.1021/ma800736p] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sergey V. Lyulin
- Institute of Macromolecular Compounds, Russian Academy of Sciences, Bolshoi Prospect 31, V.O., St. Petersburg 199004, Russia; Department of Physics, Tampere University of Technology, P.O. Box 692, FI-33101 Tampere, Finland; Helsinki University of Technology, P.O. Box 1100, FI-02015 HUT, Finland; MEMPHYS−Center for Biomembrane Physics, University of Southern Denmark, Odense, Denmark; and Computational Biophysics Laboratory, Institute of Pharmaceutical Innovation, University of Bradford, Bradford, West
| | - Ilpo Vattulainen
- Institute of Macromolecular Compounds, Russian Academy of Sciences, Bolshoi Prospect 31, V.O., St. Petersburg 199004, Russia; Department of Physics, Tampere University of Technology, P.O. Box 692, FI-33101 Tampere, Finland; Helsinki University of Technology, P.O. Box 1100, FI-02015 HUT, Finland; MEMPHYS−Center for Biomembrane Physics, University of Southern Denmark, Odense, Denmark; and Computational Biophysics Laboratory, Institute of Pharmaceutical Innovation, University of Bradford, Bradford, West
| | - Andrey A. Gurtovenko
- Institute of Macromolecular Compounds, Russian Academy of Sciences, Bolshoi Prospect 31, V.O., St. Petersburg 199004, Russia; Department of Physics, Tampere University of Technology, P.O. Box 692, FI-33101 Tampere, Finland; Helsinki University of Technology, P.O. Box 1100, FI-02015 HUT, Finland; MEMPHYS−Center for Biomembrane Physics, University of Southern Denmark, Odense, Denmark; and Computational Biophysics Laboratory, Institute of Pharmaceutical Innovation, University of Bradford, Bradford, West
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