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Molecular simulation of structural and dynamic properties of polymer nanoparticles composed of linear and cyclic polyethylene. JOURNAL OF POLYMER RESEARCH 2019. [DOI: 10.1007/s10965-019-1797-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Affiliation(s)
- Karl F. Freed
- James Franck Institute and Department of Chemistry, University of Chicago, Chicago, Illinois 60637, USA
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Tsolou G, Stratikis N, Baig C, Stephanou PS, Mavrantzas VG. Melt Structure and Dynamics of Unentangled Polyethylene Rings: Rouse Theory, Atomistic Molecular Dynamics Simulation, and Comparison with the Linear Analogues. Macromolecules 2010. [DOI: 10.1021/ma1017555] [Citation(s) in RCA: 101] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Georgia Tsolou
- Department of Chemical Engineering, University of Patras & FORTH-ICE/HT, Patras, GR 26504, Greece
| | - Nikos Stratikis
- Department of Chemical Engineering, University of Patras & FORTH-ICE/HT, Patras, GR 26504, Greece
| | - Chunggi Baig
- Department of Chemical Engineering, University of Patras & FORTH-ICE/HT, Patras, GR 26504, Greece
| | - Pavlos S. Stephanou
- Department of Chemical Engineering, University of Patras & FORTH-ICE/HT, Patras, GR 26504, Greece
| | - Vlasis G. Mavrantzas
- Department of Chemical Engineering, University of Patras & FORTH-ICE/HT, Patras, GR 26504, Greece
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Lee WJ, Ju SP, Cheng CH. A molecular dynamics study of nanoindentation on a methyl methacrylate ultrathin film on a Au(111) substrate: interface and thickness effects. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:13440-13449. [PMID: 18986180 DOI: 10.1021/la801786u] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The molecular dynamics simulation model of nanoindentation is proposed in order to study the mechanical and structural deformation properties of an ultrathin MMA (methyl methacrylate) film on a Au(111) surface. First, the significant differences in the structural arrangement of MMA thin films with different thicknesses are observed. Two layers are apparent in the thinnest MMA thin film next to the Au(111) surface, while three layer structures are apparent in the thicker film. Second, this study examines the indentation tip that penetrates the MMA thin film into the Au(111) substrate in order to understand the influence of the interface on the properties and deformation behavior in both the thin film and substrate. The result shows that the indentation force is influenced both by the layer structure and by the thickness of the MMA film. The thinnest case exhibits different deformation behavior from that of the thicker cases. In addition, the deformation of MMA molecules becomes significant at the interface between the MMA film and the Au(111) surface with the increase of film thickness, and detailed deformation behavior of the Au surface for different thicknesses of MMA film is reported in this paper. Finally, both the rigid and the active models for the indentation tip are utilized in the simulation to examine the interaction differences between the tip and the film and the deformation mechanism.
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Affiliation(s)
- Wen-Jay Lee
- Department of Mechanical and Electro-Mechanical Engineering, Center for Nanoscience and Nanotechnology, National Sun Yat-Sen University, Kaohsiung, Taiwan 804, Republic of China
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Erichsen J, Shiferaw T, Zaporojtchenko V, Faupel F. Surface glass transition in bimodal polystyrene mixtures. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2007; 24:243-246. [PMID: 18034218 DOI: 10.1140/epje/i2007-10233-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2007] [Accepted: 10/23/2007] [Indexed: 05/25/2023]
Abstract
Using the cluster-embedding method of V. Zaporojchenko et al. (Macromolecules 34, 1125 (2000)), we measured the glass transition temperature T (g) at the polystyrene/vacuum interface of bimodal mixtures of monodisperse polystyrenes of 3.5k and 1000k. Embedding of approximately 1 nm Au clusters was monitored in situ by X-ray photoelectron spectroscopy (XPS). The clusters were formed by evaporation of Au onto the polymer surface. Only one glass transition was observed in the mixtures. The surface glass transition temperatures are correlated to but are below the bulk values of the mixtures and obey the Gordon-Taylor equation. The results suggest that the earlier reported molecular-weight dependence of the surface glass transition is not due to segregation of short chains to the surface.
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Affiliation(s)
- J Erichsen
- Chair for Multicomponent Materials, Institute for Materials Science, Christian-Albrechts University at Kiel, Kaiserstr. 2, 24143, Kiel, Germany
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Curgul S, Van Vliet KJ, Rutledge GC. Molecular Dynamics Simulation of Size-Dependent Structural and Thermal Properties of Polymer Nanofibers. Macromolecules 2007. [DOI: 10.1021/ma0714666] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sezen Curgul
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, and Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
| | - Krystyn J. Van Vliet
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, and Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
| | - Gregory C. Rutledge
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, and Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
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Relationship between ligand conformations and complexation properties in ditopic biphenyl thioureas. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.05.082] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Dames SA, Aregger R, Vajpai N, Bernado P, Blackledge M, Grzesiek S. Residual Dipolar Couplings in Short Peptides Reveal Systematic Conformational Preferences of Individual Amino Acids. J Am Chem Soc 2006; 128:13508-14. [PMID: 17031964 DOI: 10.1021/ja063606h] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Residual dipolar couplings (RDCs) observed by NMR in solution under weak alignment conditions can monitor average net orientations and order parameters of individual bonds. By their simple geometrical dependence, RDCs bear particular promise for the quantitative characterization of conformations in partially folded or unfolded proteins. We have systematically investigated the influence of amino acid substitutions X on the conformation of unfolded model peptides EGAAXAASS as monitored by their (1)H(Nu)-(15)N and (1)H(alpha)-(13)C(alpha) RDCs detected at natural abundance of (15)N and (13)C in strained polyacrylamide gels. In total, 14 single amino acid substitutions were investigated. The RDCs show a specific dependence on the substitution X that correlates to steric or hydrophobic interactions with adjacent amino acids. In particular, the RDCs for the glycine and proline substitutions indicate less or more order, respectively, than the other amino acids. The RDCs for aromatic substitutions tryptophane and tyrosine give evidence of a kink in the peptide backbone. This effect is also observable for orientation by Pf1 phages and corroborated by variations in (13)C(alpha) secondary shifts and (3)J(HNH)(alpha) scalar couplings in isotropic samples. RDCs for a substitution with the beta-turn sequence KNGE differ from single amino acid substitutions. Terminal effects and next neighbor effects could be demonstrated by further specific substitutions. The results were compared to statistical models of unfolded peptide conformations derived from PDB coil subsets, which reproduce overall trends for (1)H(Nu)-(15)N RDCs for most substitutions, but deviate more strongly for (1)H(alpha)-(13)C(alpha) RDCs. The outlined approach opens the possibility to obtain a systematic experimental characterization of the influence of individual amino acid/amino acid interactions on orientational preferences in polypeptides.
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Dionne PJ, Picu CR, Ozisik R. Adsorption and Desorption Dynamics of Linear Polymer Chains to Spherical Nanoparticles: A Monte Carlo Investigation. Macromolecules 2006. [DOI: 10.1021/ma0527754] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Peter J. Dionne
- Department of Mechanical, Aerospace and Nuclear Engineering and Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180
| | - Catalin R. Picu
- Department of Mechanical, Aerospace and Nuclear Engineering and Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180
| | - Rahmi Ozisik
- Department of Mechanical, Aerospace and Nuclear Engineering and Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180
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Mattice WL, Helfer CA, Rane SS, Von Meerwall ED, Farmer BL. Some mechanisms for subtle influences of stereochemical composition on the physical properties of macromolecules. ACTA ACUST UNITED AC 2005. [DOI: 10.1002/polb.20411] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Rane SS, Mattice WL, Dhinojwala A. Atomistic Simulation of Orientation of Methyl Groups and Methylene Bisectors, and Surface Segregation, in Freely Standing Thin Films of Atactic Poly(ethylene-co-propylene). J Phys Chem B 2004. [DOI: 10.1021/jp037000g] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sagar S. Rane
- Department of Polymer Science, The University of Akron, Akron, Ohio 44325-3909
| | - Wayne L. Mattice
- Department of Polymer Science, The University of Akron, Akron, Ohio 44325-3909
| | - Ali Dhinojwala
- Department of Polymer Science, The University of Akron, Akron, Ohio 44325-3909
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Jain TS, de Pablo JJ. Influence of confinement on the vibrational density of states and the Boson peak in a polymer glass. J Chem Phys 2004; 120:9371-5. [PMID: 15267875 DOI: 10.1063/1.1689952] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We have performed a normal-mode analysis on a glass forming polymer system for bulk and free-standing film geometries prepared under identical conditions. It is found that for free-standing film glasses, the normal-mode spectrum exhibits significant differences from the bulk glass with the appearance of an additional low-frequency peak and a higher intensity at the Boson peak frequency. A detailed eigenvector analysis shows that the low-frequency peak corresponds to a shear-horizontal mode which is predicted by continuum theory. The peak at higher frequency (Boson peak) corresponds to motions that are correlated over a length scale of approximately twice the interaction site diameter. These observations shed some light on the microscopic dynamics of glass formers, and help explain decreasing fragility that arises with decreasing thickness in thin films.
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Affiliation(s)
- Tushar S Jain
- University of Wisconsin-Madison, Department of Chemical and Biological Engineering, Madison, Wisconsin 53706, USA
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Erichsen J, Kanzow J, Schürmann U, Dolgner K, Günther-Schade K, Strunskus T, Zaporojtchenko V, Faupel F. Investigation of the Surface Glass Transition Temperature by Embedding of Noble Metal Nanoclusters into Monodisperse Polystyrenes. Macromolecules 2004. [DOI: 10.1021/ma0353080] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jörn Erichsen
- Lehrstuhl für Materialverbunde, Faculty of Engineering, University of Kiel, Kaiserstr. 2, 24143 Kiel, Germany
| | - Jörn Kanzow
- Lehrstuhl für Materialverbunde, Faculty of Engineering, University of Kiel, Kaiserstr. 2, 24143 Kiel, Germany
| | - Ulrich Schürmann
- Lehrstuhl für Materialverbunde, Faculty of Engineering, University of Kiel, Kaiserstr. 2, 24143 Kiel, Germany
| | - Kai Dolgner
- Lehrstuhl für Materialverbunde, Faculty of Engineering, University of Kiel, Kaiserstr. 2, 24143 Kiel, Germany
| | - Katja Günther-Schade
- Lehrstuhl für Materialverbunde, Faculty of Engineering, University of Kiel, Kaiserstr. 2, 24143 Kiel, Germany
| | - Thomas Strunskus
- Lehrstuhl für Materialverbunde, Faculty of Engineering, University of Kiel, Kaiserstr. 2, 24143 Kiel, Germany
| | - Vladimir Zaporojtchenko
- Lehrstuhl für Materialverbunde, Faculty of Engineering, University of Kiel, Kaiserstr. 2, 24143 Kiel, Germany
| | - Franz Faupel
- Lehrstuhl für Materialverbunde, Faculty of Engineering, University of Kiel, Kaiserstr. 2, 24143 Kiel, Germany
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Kajiyama T, Tanaka K, Takahara A. Analysis of surface mobility in polystyrene films with monodisperse and bimodal molecular weights by lateral force microscopy. ACTA ACUST UNITED AC 2003. [DOI: 10.1002/pola.10873] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Jain TS, de Pablo JJ. Monte Carlo Simulation of Free-Standing Polymer Films near the Glass Transition Temperature. Macromolecules 2002. [DOI: 10.1021/ma011820e] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tushar S. Jain
- Department of Chemical Engineering, University of WisconsinMadison, Madison, Wisconsin 53706
| | - Juan J. de Pablo
- Department of Chemical Engineering, University of WisconsinMadison, Madison, Wisconsin 53706
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Satomi N, Tanaka K, Takahara A, Kajiyama T, Ishizone T, Nakahama S. Surface Molecular Motion of Monodisperse α,ω-Diamino-Terminated and α,ω-Dicarboxy-Terminated Polystyrenes. Macromolecules 2001. [DOI: 10.1021/ma010126w] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Meyer H, Biermann O, Faller R, Reith D, Müller-Plathe F. Coarse graining of nonbonded inter-particle potentials using automatic simplex optimization to fit structural properties. J Chem Phys 2000. [DOI: 10.1063/1.1308542] [Citation(s) in RCA: 99] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Tanaka K, Takahara A, Kajiyama T. Rheological Analysis of Surface Relaxation Process of Monodisperse Polystyrene Films. Macromolecules 2000. [DOI: 10.1021/ma000406w] [Citation(s) in RCA: 166] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Keiji Tanaka
- Department of Applied Chemistry, Faculty of Engineering, Kyushu University, Fukuoka 812-8581, Japan
| | - Atsushi Takahara
- Department of Applied Chemistry, Faculty of Engineering, Kyushu University, Fukuoka 812-8581, Japan
| | - Tisato Kajiyama
- Department of Applied Chemistry, Faculty of Engineering, Kyushu University, Fukuoka 812-8581, Japan
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Jang JH, Ozisik R, Mattice WL. A Monte Carlo Simulation on the Effects of Chain End Modification on Freely Standing Thin Films of Amorphous Polyethylene Melts. Macromolecules 2000. [DOI: 10.1021/ma000957m] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jee Hwan Jang
- Institute of Polymer Science, University of Akron, Akron, Ohio 44325-3909, and Institut fur Polymere, ETH Zentrum, Zurich, CH-8092, Switzerland
| | - Rahmi Ozisik
- Institute of Polymer Science, University of Akron, Akron, Ohio 44325-3909, and Institut fur Polymere, ETH Zentrum, Zurich, CH-8092, Switzerland
| | - Wayne L. Mattice
- Institute of Polymer Science, University of Akron, Akron, Ohio 44325-3909, and Institut fur Polymere, ETH Zentrum, Zurich, CH-8092, Switzerland
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Ozisik R, Doruker P, Mattice W, von Meerwall E. Translational diffusion in Monte Carlo simulations of polymer melts: center of mass displacement vs. integrated velocity autocorrelation function. ACTA ACUST UNITED AC 2000. [DOI: 10.1016/s1089-3156(00)00008-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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