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Salahshoori I, Babapoor A, Seyfaee A. Elevated performance of the neat, hybrid and composite membranes by the addition of nanoparticles (ZIF-67): A molecular dynamics study. Polym Bull (Berl) 2022. [DOI: 10.1007/s00289-021-03673-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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2
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Kazemi Noureini S, Kheirabadi M, Masoumi F, Khosrogerdi F, Zarei Y, Suárez-Rozas C, Salas-Norambuena J, Kennedy Cassels B. Telomerase Inhibition by a New Synthetic Derivative of the Aporphine Alkaloid Boldine. Int J Mol Sci 2018; 19:ijms19041239. [PMID: 29671783 PMCID: PMC5979471 DOI: 10.3390/ijms19041239] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2018] [Revised: 04/15/2018] [Accepted: 04/16/2018] [Indexed: 12/16/2022] Open
Abstract
Telomerase, the enzyme responsible for cell immortality, is an important target in anti-cancer drug discovery. Boldine, an abundant aporphine alkaloid of Peumus boldus, is known to inhibit telomerase at non-toxic concentrations. Cytotoxicity of N-benzylsecoboldine hydrochloride (BSB), a synthetic derivative of boldine, was determined using the MTT method in MCF7 and MDA-MB231 cells. Aliquots of cell lysates were incubated with various concentrations of BSB in qTRAP (quantitative telomere repeat amplification protocol)-ligand experiments before substrate elongation by telomerase or amplification by hot-start Taq polymerase. The crystal structure of TERT, the catalytic subunit of telomerase from Tribolium castaneum, was used for docking and molecular dynamics analysis. The qTRAP-ligand data gave an IC50 value of about 0.17 ± 0.1 µM for BSB, roughly 400 times stronger than boldine, while the LD50 in the cytotoxicity assays were 12.5 and 21.88 µM, respectively, in cells treated for 48 h. Although both compounds interacted well with the active site, MD analysis suggests a second binding site with which BSB interacts via two hydrogen bonds, much more strongly than boldine. Theoretical analyses also evaluated the IC50 for BSB as submicromolar. BSB, with greater hydrophobicity and flexibility than boldine, represents a promising structure to inhibit telomerase at non-toxic concentrations.
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Affiliation(s)
- Sakineh Kazemi Noureini
- Department of Biology, Faculty of Sciences, Hakim Sabzevari University, Sabzevar 9617976487, Iran.
| | - Mitra Kheirabadi
- Department of Biology, Faculty of Sciences, Hakim Sabzevari University, Sabzevar 9617976487, Iran.
| | - Fatima Masoumi
- Department of Biology, Faculty of Sciences, Hakim Sabzevari University, Sabzevar 9617976487, Iran.
| | - Farve Khosrogerdi
- Department of Biology, Faculty of Sciences, Hakim Sabzevari University, Sabzevar 9617976487, Iran.
| | - Younes Zarei
- Department of Biology, Faculty of Sciences, Hakim Sabzevari University, Sabzevar 9617976487, Iran.
| | - Cristian Suárez-Rozas
- Department of Chemistry, Faculty of Sciences, University of Chile, Santiago 1058, Chile.
| | - Julio Salas-Norambuena
- Department of Chemistry, Faculty of Sciences, University of Chile, Santiago 1058, Chile.
| | - Bruce Kennedy Cassels
- Department of Chemistry, Faculty of Sciences, University of Chile, Santiago 1058, Chile.
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3
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Dadou SM, El-Barghouthi MI, Alabdallah SK, Badwan AA, Antonijevic MD, Chowdhry BZ. Effect of Protonation State and N-Acetylation of Chitosan on Its Interaction with Xanthan Gum: A Molecular Dynamics Simulation Study. Mar Drugs 2017; 15:md15100298. [PMID: 28946687 PMCID: PMC5666406 DOI: 10.3390/md15100298] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2017] [Revised: 09/17/2017] [Accepted: 09/20/2017] [Indexed: 12/21/2022] Open
Abstract
Hydrophilic matrices composed of chitosan (CS) and xanthan gum (XG) complexes are of pharmaceutical interest in relation to drug delivery due to their ability to control the release of active ingredients. Molecular dynamics simulations (MDs) have been performed in order to obtain information pertaining to the effect of the state of protonation and degree of N-acetylation (DA) on the molecular conformation of chitosan and its ability to interact with xanthan gum in aqueous solutions. The conformational flexibility of CS was found to be highly dependent on its state of protonation. Upon complexation with XG, a substantial restriction in free rotation around the glycosidic bond was noticed in protonated CS dimers regardless of their DA, whereas deprotonated molecules preserved their free mobility. Calculated values for the free energy of binding between CS and XG revealed the dominant contribution of electrostatic forces on the formation of complexes and that the most stable complexes were formed when CS was at least half-protonated and the DA was ≤50%. The results obtained provide an insight into the main factors governing the interaction between CS and XG, such that they can be manipulated accordingly to produce complexes with the desired controlled-release effect.
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Affiliation(s)
- Suha M Dadou
- Department of Pharmaceutical, Chemical and Environmental Science, Faculty of Engineering and Science, University of Greenwich, Medway Campus, Chatham Maritime, Kent ME4 4TB, UK.
| | - Musa I El-Barghouthi
- Department of Chemistry, The Hashemite University, P.O. Box 150459, Zarqa 13115, Jordan.
| | - Samer K Alabdallah
- Department of Chemistry, The Hashemite University, P.O. Box 150459, Zarqa 13115, Jordan.
| | - Adnan A Badwan
- The Jordanian Pharmaceutical Manufacturing Company (PLC), Research and Innovation Centre, P.O. Box 94, Naor 11710, Jordan.
| | - Milan D Antonijevic
- Department of Pharmaceutical, Chemical and Environmental Science, Faculty of Engineering and Science, University of Greenwich, Medway Campus, Chatham Maritime, Kent ME4 4TB, UK.
| | - Babur Z Chowdhry
- Department of Pharmaceutical, Chemical and Environmental Science, Faculty of Engineering and Science, University of Greenwich, Medway Campus, Chatham Maritime, Kent ME4 4TB, UK.
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Real-time tracking of physical changes and optical anisotropy during drying of aqueous chitosan solution: Modeling of drying. POLYMER 2017. [DOI: 10.1016/j.polymer.2016.11.057] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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McDonnell MT, Greeley DA, Kit KM, Keffer DJ. Molecular Dynamics Simulations of Hydration Effects on Solvation, Diffusivity, and Permeability in Chitosan/Chitin Films. J Phys Chem B 2016; 120:8997-9010. [DOI: 10.1021/acs.jpcb.6b05999] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Marshall T. McDonnell
- Department of Chemical and Biomolecular
Engineering,
and ‡Department of Materials
Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Duncan A. Greeley
- Department of Chemical and Biomolecular
Engineering,
and ‡Department of Materials
Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Kevin M. Kit
- Department of Chemical and Biomolecular
Engineering,
and ‡Department of Materials
Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - David J. Keffer
- Department of Chemical and Biomolecular
Engineering,
and ‡Department of Materials
Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
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7
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Chen S, Xu H, Duan H, Hua M, Wei L, Shang H, Li J. Influence of hydrostatic pressure on water absorption of polyoxymethylene: experiment and molecular dynamics simulation. POLYM ADVAN TECHNOL 2016. [DOI: 10.1002/pat.3858] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Song Chen
- State Key Laboratory of Special Surface Protection Materials and Application Technology; Wuhan Research Institute of Materials Protection; Wuhan 430030 Hubei China
| | - Haiping Xu
- Xi'an Precision Machinery Research Institute; Xi'an 710075 China
| | - Haitao Duan
- State Key Laboratory of Special Surface Protection Materials and Application Technology; Wuhan Research Institute of Materials Protection; Wuhan 430030 Hubei China
| | - Meng Hua
- MBE Department; City University of Hong Kong; Hong Kong 999077 Hong Kong
| | - Lei Wei
- State Key Laboratory of Special Surface Protection Materials and Application Technology; Wuhan Research Institute of Materials Protection; Wuhan 430030 Hubei China
| | - Hongfei Shang
- State Key Laboratory of Tribology; Tsinghua University; Beijing 100084 China
| | - Jian Li
- State Key Laboratory of Special Surface Protection Materials and Application Technology; Wuhan Research Institute of Materials Protection; Wuhan 430030 Hubei China
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Moulik S, Kumar KP, Bohra S, Sridhar S. Pervaporation performance of PPO membranes in dehydration of highly hazardous mmh and udmh liquid propellants. JOURNAL OF HAZARDOUS MATERIALS 2015; 288:69-79. [PMID: 25698568 DOI: 10.1016/j.jhazmat.2015.02.020] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2014] [Revised: 02/02/2015] [Accepted: 02/06/2015] [Indexed: 06/04/2023]
Abstract
Polyphenylene oxide (PPO) membranes synthesized from 2,6-dimethyl phenol monomer were subjected to pervaporation-based dehydration of the highly hazardous and hypergolic monomethyl hydrazine (MMH) and unsymmetrical dimethyl hydrazine (UDMH) liquid propellants. Membranes were characterized by TGA, DSC and SEM to study the effect of temperature besides morphologies of surface and cross-section of the films, respectively. Molecular dynamics (MD) simulation was used to study the diffusion behavior of solutions within the membrane. CFD method was employed to solve the governing mass transfer equations by considering the flux coupling. The modeling results were highlighted by the experimental data and were in good agreement. High separation factors (35-70) and reasonable water fluxes (0.1-0.2 kg/m(2)h) were observed for separation of the aqueous azeotropes of MMH (35 wt%) and UDMH (20 wt%) and their further enrichment to >90% purity. Effect of feed composition, membrane thickness and permeate pressure on separation performance of PPO membranes were investigated to determine optimum operating conditions.
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Affiliation(s)
- Siddhartha Moulik
- Membrane Separations Group, Chemical Engineering Division, Indian Institute of Chemical Technology (IICT), Hyderabad 500007, India
| | - K Praveen Kumar
- Membrane Separations Group, Chemical Engineering Division, Indian Institute of Chemical Technology (IICT), Hyderabad 500007, India
| | - Subha Bohra
- Membrane Separations Group, Chemical Engineering Division, Indian Institute of Chemical Technology (IICT), Hyderabad 500007, India
| | - Sundergopal Sridhar
- Membrane Separations Group, Chemical Engineering Division, Indian Institute of Chemical Technology (IICT), Hyderabad 500007, India.
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Water-induced local ordering of chitosan polymer chains in thin layer films. Carbohydr Polym 2015; 118:107-14. [DOI: 10.1016/j.carbpol.2014.11.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2014] [Revised: 10/31/2014] [Accepted: 11/03/2014] [Indexed: 11/20/2022]
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Bahramian A. Viscoelastic properties of polyaniline-emeraldine base nanostructured films: Experimental results and molecular dynamics simulations. J Appl Polym Sci 2014. [DOI: 10.1002/app.41858] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Alireza Bahramian
- Department of Chemical Engineering; Hamedan University of Technology; Hamedan 65155 Iran
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11
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Chai D, Xie Z, Wang Y, Liu L, Yum YJ. Molecular dynamics investigation of the adhesion mechanism acting between dopamine and the surface of dopamine-processed aramid fibers. ACS APPLIED MATERIALS & INTERFACES 2014; 6:17974-84. [PMID: 25275919 DOI: 10.1021/am504799m] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Dopamine, as a universal material for surface treatment, can effectively improve the surface performance of aramid fibers. However, directly processing the surface of aramid fibers using dopamine currently incurs a high cost. To seek dopamine substitutes, one must first explore the adhesion mechanism responsible for binding the dopamine to the surface of the fiber. In this study, we construct an all-atomic molecular dynamics model of an aramid fiber before and after surface modification using dopamine. A force field based on condensed-phase optimized molecular potentials for atomistic simulation studies (COMPASS) is used. Using it, we analyze the surface adhesion mechanism of polydopamines aggregated by 21 kinds of molecular structures typically found on the surface of aramid fibers. The results show that a clear and smooth interface is formed between the polydopamine nanofilm layer and the surface of the aramid fiber. The high atomic density of the polydopamine in the small interface region is found to be conducive to noncovalent bonds of polydopamines with the surface of the aramid fiber. In addition, we investigate the works of adhesion of the 21 molecular structures typically found on the surface of aramid fibers. The results suggest that the work of adhesion of 5,6-indolequinone is the highest, followed by annular eumelanin molecules with annular planar structure. Straight-chain shaped dimers proved to be the molecules with the highest adhesion ability of the dihydroxyindole chain oligomers. Therefore, there is reason to suppose that more molecular structures (as above) can be formed by processing the surface of aramid fibers using dopamine by controlling the processing conditions. These molecular structures help improve the adhesion ability of the dopamine on the surface of the aramid fiber. Additionally, if these polydopamine molecules with high adhesion ability can be synthesized on a large scale, then new surface-processing materials are possible.
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Affiliation(s)
- Dongliang Chai
- National Key Laboratory of Science and Technology on Advanced Composites in Special Environment, Center for Composite Materials, Harbin Institute of Technology , Harbin 150001, People's Republic of China
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Gu C, Gu H, Lang M. Molecular Simulation to Predict Miscibility and Phase Separation Behavior of Chitosan/Poly(ϵ-caprolactone) Binary Blends: A Comparison with Experiments. MACROMOL THEOR SIMUL 2013. [DOI: 10.1002/mats.201300109] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Chunhua Gu
- Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Technology, State Key Laboratory of Bioreactor Engineering, School of Bioengineering; East China University of Science and Technology; Shanghai 200237 China
| | - Huiyan Gu
- Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Technology, State Key Laboratory of Bioreactor Engineering, School of Bioengineering; East China University of Science and Technology; Shanghai 200237 China
| | - Meidong Lang
- Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Technology, State Key Laboratory of Bioreactor Engineering, School of Bioengineering; East China University of Science and Technology; Shanghai 200237 China
- State Key Laboratory of Bioreactor Engineering, School of Bioengineering; East China University of Science and Technology; Shanghai 200237 China
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Yang S, Choi J, Cho M. Elastic stiffness and filler size effect of covalently grafted nanosilica polyimide composites: molecular dynamics study. ACS APPLIED MATERIALS & INTERFACES 2012; 4:4792-4799. [PMID: 22931169 DOI: 10.1021/am301144z] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The filler size-dependent elastic stiffness of nanosilica (α-quartz)-reinforced polyimide(s-BPDA/1,3,4-APB) composites under the same volume fraction and grafting ratio conditions was investigated via molecular dynamics(MD) simulations. To enhance the interfacial load transfer efficiency, we treated the surface oxygen atoms of the silica nanoparticle with additional silicon atoms attached by a propyl group to which the aromatic hydrocarbon in the polyimide is directly grafted. As the radius of the embedded nanoparticle increases, the Young's and shear moduli gradually decrease, showing a prominent filler size effect. At the same time, the moduli of the nanocomposites increase as the grafting ratio increases. The contribution of different nanoparticles to the filler size dependency in elastic stiffness of the nanocomposites can be elucidated by comparing the normalized adhesive interaction energy between the particle and matrix which exhibits prominent filler size dependency. Because of the immobilization of the matrix polymer in the vicinity of the nanoparticles, which was confirmed by the self-diffusion coefficient, the highly grafted interface is found to bring about a greater reinforcing effect than the ungrafted interface.
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Affiliation(s)
- Seunghwa Yang
- Division of WCU Multiscale Mechanical Design, School of Mechanical and Aerospace Engineering, Seoul National University 599, Kwanak-Ro, Kwanak-Ku, Seoul151-744, Korea
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14
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Liu H, Li Y, Krause WE, Rojas OJ, Pasquinelli MA. The Soft-Confined Method for Creating Molecular Models of Amorphous Polymer Surfaces. J Phys Chem B 2012; 116:1570-8. [DOI: 10.1021/jp209024r] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Hongyi Liu
- Fiber and Polymer Science Program and the Department of Textile Engineering, Chemistry, and Science, North Carolina State University, Raleigh, NC 27695, United States
| | - Yan Li
- The KAUST-Cornell Center for Energy and Sustainability (KAUST-CU), Cornell University, Ithaca, New York 14853, United States
| | - Wendy E. Krause
- Fiber and Polymer Science Program and the Department of Textile Engineering, Chemistry, and Science, North Carolina State University, Raleigh, NC 27695, United States
| | - Orlando J. Rojas
- Fiber and Polymer Science Program and the Department of Textile Engineering, Chemistry, and Science, North Carolina State University, Raleigh, NC 27695, United States
- Department of Forest Biomaterials, North Carolina State University, Raleigh, North Carolina 27695, United States
- Department of Forest Products Technology, School of Chemical Technology, Aalto University, P.O. Box 16300, FI-00076 Aalto, Finland
| | - Melissa A. Pasquinelli
- Fiber and Polymer Science Program and the Department of Textile Engineering, Chemistry, and Science, North Carolina State University, Raleigh, NC 27695, United States
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15
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Sudibjo A, Spearot DE. Molecular dynamics simulation of diffusion of small atmospheric penetratesin polydimethylsiloxane. MOLECULAR SIMULATION 2011. [DOI: 10.1080/08927022.2010.524646] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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16
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Gautieri A, Vesentini S, Redaelli A. How to predict diffusion of medium-sized molecules in polymer matrices. From atomistic to coarse grain simulations. J Mol Model 2010; 16:1845-51. [PMID: 20224911 DOI: 10.1007/s00894-010-0687-7] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2009] [Accepted: 02/04/2010] [Indexed: 11/29/2022]
Abstract
The normal diffusion regime of many small and medium-sized molecules occurs on a time scale that is too long to be studied by atomistic simulations. Coarse-grained (CG) molecular simulations allow to investigate length and time scales that are orders of magnitude larger compared to classical molecular dynamics simulations, hence providing a valuable approach to span time and length scales where normal diffusion occurs. Here we develop a novel multi-scale method for the prediction of diffusivity in polymer matrices which combines classical and CG molecular simulations. We applied an atomistic-based method in order to parameterize the CG MARTINI force field, providing an extension for the study of diffusion behavior of penetrant molecules in polymer matrices. As a case study, we found the parameters for benzene (as medium sized penetrant molecule whose diffusivity cannot be determined through atomistic models) and Poly (vinyl alcohol) (PVA) as polymer matrix. We validated our extended MARTINI force field determining the self diffusion coefficient of benzene (2.27·10⁻⁹m² s⁻¹) and the diffusion coefficient of benzene in PVA (0.263·10⁻¹² m² s⁻¹). The obtained diffusion coefficients are in remarkable agreement with experimental data (2.20·10⁻⁹m² s⁻¹ and 0.25·10⁻¹² m² s⁻¹, respectively). We believe that this method can extend the application range of computational modeling, providing modeling tools to study the diffusion of larger molecules and complex polymeric materials.
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Affiliation(s)
- Alfonso Gautieri
- Biomechanics Group, Department of Bioengineering, Politecnico di Milano, Via Golgi 39, 20133 Milan, Italy
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