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Microscopic mechanism study and process optimization of dimethyl carbonate production coupled biomass chemical looping gasification system. Chin J Chem Eng 2022. [DOI: 10.1016/j.cjche.2022.12.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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Gharib-Zahedi MR, Koochaki A, Alaghemandi M. Tuning the polymer thermal conductivity through structural modification induced by MoS 2 bilayers. SOFT MATTER 2022; 18:6927-6933. [PMID: 36052767 DOI: 10.1039/d2sm00660j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The present work refers to a physical and structural study of nanoconfined polymers in polymer-MoS2 nanocomposites as a function of MoS2-MoS2 interlayer distance. We applied reverse nonequilibrium molecular dynamics (RNEMD) simulations to investigate the thermal conductivity (λ) of polyamide oligomers confined by MoS2 bilayers. The results of this study indicate that thermal conductivity of polymer can be considerably enhanced when polymer chains are confined by MoS2 sheets, this behavior is more pronounced by charged surfaces. The presence of MoS2 surfaces leads to elongation as well as preferential alignment of polymer chains parallel to the MoS2 surfaces, which in turn results in higher order and denser packing of polymer content and hence larger thermal conductivity in comparison to the bulk polymer. Additionally, the analysis of the number of hydrogen bonds (HBs) in confined polymer chains suggests that a combined effect of the mentioned structural modification and enlarged values of HBs may cooperatively contribute to high polymer thermal conductivity, facilitating phonon transport. The results reported here suggest a significant way to design confined polymer-MoS2 composites for significantly improving thermal conductivity for a wide variety of applications.
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Affiliation(s)
| | - Amin Koochaki
- Department of Chemical Sciences and Bernal Institute, University of Limerick, Limerick, Republic of Ireland
| | - Mohammad Alaghemandi
- Department of Computer Science, Metropolitan College, Boston University, Boston, MA, USA
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Tian W, Zhang H, Cui Z, Hu X. Mechanism analysis and simulation of methyl methacrylate production coupled chemical looping gasification system. Chin J Chem Eng 2021. [DOI: 10.1016/j.cjche.2021.02.024] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Abstract
The molecular structure of bound layers at attractive polymer-nanoparticle interfaces strongly influences the properties of nanocomposites. Thus, a unifying theoretical framework that can provide insights into the correlations between the molecular structure of the bound layers, their thermodynamics, and macroscopic properties is highly desirable. In this work, molecular dynamics simulations were used in combination with local fingerprint analysis of configurational entropy and interaction energy at the segmental scale, with the goal to establish such physical grounds. The thickness of bound polymer layers is found to be independent of the polymer chain length, as deduced from density oscillations at the surface of a nanotube. The local configurational entropy of layers is estimated from pair correlations in equilibrium structures. By plotting mean layer entropy vs internal energy on a phase diagram, a one-to-one equivalence is established between the local structures of layers and their thermodynamic properties. Moreover, a gradient in local dynamics of segments in bound layers under equilibrium is observed normal to the nanoparticle surface. The relaxation times of individual layers show correspondence to their phase diagram fingerprints, thus suggesting that a unified perspective can be envisioned for such materials built on the grounds of locally heterogeneous interfaces.
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Affiliation(s)
- Ali Gooneie
- Laboratory of Advanced Fibers, Empa, Swiss Federal Laboratories for Materials Science and Technology, Lerchenfeldstrasse 5, CH-9014 St. Gallen, Switzerland
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Pan D, Hufenus R, Qin Z, Chen L, Gooneie A. Tuning gradient microstructures in immiscible polymer blends by viscosity ratio. J Appl Polym Sci 2019. [DOI: 10.1002/app.48165] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Dan Pan
- Laboratory of Advanced FibersEmpa, Swiss Federal Laboratories for Materials Science and Technology, Lerchenfeldstrasse 5, CH‐9014 St. Gallen Switzerland
- State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsCollege of Materials Science and Engineering, Donghua University Shanghai 201620 People's Republic of China
| | - Rudolf Hufenus
- Laboratory of Advanced FibersEmpa, Swiss Federal Laboratories for Materials Science and Technology, Lerchenfeldstrasse 5, CH‐9014 St. Gallen Switzerland
| | - Zongyi Qin
- State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsCollege of Materials Science and Engineering, Donghua University Shanghai 201620 People's Republic of China
| | - Long Chen
- State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsCollege of Materials Science and Engineering, Donghua University Shanghai 201620 People's Republic of China
| | - Ali Gooneie
- Laboratory of Advanced FibersEmpa, Swiss Federal Laboratories for Materials Science and Technology, Lerchenfeldstrasse 5, CH‐9014 St. Gallen Switzerland
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Gooneie A, Hufenus R. Polymeric Solvation Shells around Nanotubes: Mesoscopic Simulation of Interfaces in Nanochannels. Macromolecules 2019. [DOI: 10.1021/acs.macromol.9b01657] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Ali Gooneie
- Laboratory of Advanced Fibers, Empa, Swiss Federal Laboratories for Materials Science and Technology, Lerchenfeldstrasse 5, CH-9014 St. Gallen, Switzerland
| | - Rudolf Hufenus
- Laboratory of Advanced Fibers, Empa, Swiss Federal Laboratories for Materials Science and Technology, Lerchenfeldstrasse 5, CH-9014 St. Gallen, Switzerland
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Effects of Three Different Injection-Molding Methods on the Mechanical Properties and Electrical Conductivity of Carbon Nanotube/Polyethylene/Polyamide 6 Nanocomposite. Polymers (Basel) 2019; 11:polym11111779. [PMID: 31671568 PMCID: PMC6918180 DOI: 10.3390/polym11111779] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Revised: 10/25/2019] [Accepted: 10/28/2019] [Indexed: 11/17/2022] Open
Abstract
Morphological evolution under shear, during different injection processes, is an important issue in the phase morphology control, electrical conductivity, and physical properties of immiscible polymer blends. In the current work, conductive nanocomposites were produced through three different injection-molding methods, namely, conventional injection molding, multi-flow vibration injection molding (MFVIM), and pressure vibration injection molding (PVIM). Carbon nanotubes in the polyamide (PA) phase and the morphology of the PA phase were controlled by various injection methods. For MFVIM, multi-flows provided consistently stable shear forces, and mechanical properties were considerably improved after the application of high shear stress. Shear forces improved electrical property along the flow direction by forming an oriented conductive path. However, shear does not always promote the formation of conductive paths. Oscillatory shear stress from a vibration system of PVIM can tear a conductive path, thereby reducing electrical conductivity by six orders of magnitude. Although unstable high shear forces can greatly improve mechanical properties compared with the conventional injection molding (CIM) sample, oscillatory shear stress increases the dispersion of the PA phase. These interesting results provide insights into the production of nanocomposites with high mechanical properties and suitable electrical conductivity by efficient injection molding.
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Perret E, Reifler FA, Gooneie A, Hufenus R. Tensile study of melt-spun poly(3-hydroxybutyrate) P3HB fibers: Reversible transformation of a highly oriented phase. POLYMER 2019. [DOI: 10.1016/j.polymer.2019.121668] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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X-ray data from a cyclic tensile study of melt-spun poly(3-hydroxybutyrate) P3HB fibers: A reversible mesophase. Data Brief 2019; 25:104376. [PMID: 31497630 PMCID: PMC6722231 DOI: 10.1016/j.dib.2019.104376] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2019] [Revised: 07/30/2019] [Accepted: 08/01/2019] [Indexed: 11/21/2022] Open
Abstract
Wide-angle x-ray diffraction (WAXD) patterns that show mesophases in core-sheath bicomponent fibers and amorphous fibers are presented in section 1.1 of the article. Section 1.2 presents molecular dynamics simulations and scattered intensity calculations of stretched P3HB chains. Sections 1.3–1.6 summarize WAXD and small-angle x-ray scattering (SAXS) data analysis from a tensile study of melt-spun P3HB fibers. Azimuthal profiles are extracted from 2D WAXD patterns at various angular regions and the positions of equatorial reflections and corresponding d-spacings are summarized. Additionally, the extracted structural parameters from SAXS images are summarized. The tensile stress calculations, crystal orientation calculations, applied intensity corrections, calculations of long spacings, coherence lengths and lamellar diameters are explained in the methods subsections 2.3.1–2.3.7. WAXD and SAXS measurements of P3HB fibers were recorded on a Bruker Nanostar U diffractometer (Bruker AXS, Karlsruhe, Germany). The recorded WAXD/SAXS patterns were analyzed with the evaluation software DIFFRAC.EVA (version 4.2., Bruker AXS, Karlsruhe, Germany) and python codes. For more information see ‘Tensile study of melt-spun poly(3-hydroxybutyrate) P3HB fibers: Reversible transformation of a highly oriented phase’ (Perret et al., 2019).
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Entropic Effects in Polymer Nanocomposites. ENTROPY 2019; 21:e21020186. [PMID: 33266901 PMCID: PMC7514668 DOI: 10.3390/e21020186] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Revised: 01/31/2019] [Accepted: 02/11/2019] [Indexed: 01/16/2023]
Abstract
Polymer nanocomposite materials, consisting of a polymer matrix embedded with nanoscale fillers or additives that reinforce the inherent properties of the matrix polymer, play a key role in many industrial applications. Understanding of the relation between thermodynamic interactions and macroscopic morphologies of the composites allow for the optimization of design and mechanical processing. This review article summarizes the recent advancement in various aspects of entropic effects in polymer nanocomposites, and highlights molecular methods used to perform numerical simulations, morphologies and phase behaviors of polymer matrices and fillers, and characteristic parameters that significantly correlate with entropic interactions in polymer nanocomposites. Experimental findings and insight obtained from theories and simulations are combined to understand how the entropic effects are turned into effective interparticle interactions that can be harnessed for tailoring nanostructures of polymer nanocomposites.
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Gooneie A, Hufenus R. Hybrid Carbon Nanoparticles in Polymer Matrix for Efficient Connected Networks: Self-Assembly and Continuous Pathways. Macromolecules 2018. [DOI: 10.1021/acs.macromol.8b00585] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Ali Gooneie
- Laboratory of Advanced Fibers, Empa, Swiss Federal Laboratories for Materials Science and Technology, Lerchenfeldstrasse 5, CH-9014 St. Gallen, Switzerland
| | - Rudolf Hufenus
- Laboratory of Advanced Fibers, Empa, Swiss Federal Laboratories for Materials Science and Technology, Lerchenfeldstrasse 5, CH-9014 St. Gallen, Switzerland
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Cui L, Wang P, Zhang Y, Zhou X, Xu L, Zhang L, Zhang L, Liu L, Guo X. Glass fiber reinforced and β-nucleating agents regulated polypropylene: A complementary approach and a case study. J Appl Polym Sci 2017. [DOI: 10.1002/app.45768] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Linfang Cui
- Center for Green Chemistry and Organic Functional Materials Laboratory, Xinjiang Technical Institute of Physics and Chemistry; Chinese Academy of Sciences; Urumqi 830011 China
- Center for Green Chemistry and Organic Functional Materials Laboratory; University of Chinese Academy of Sciences; Beijing 100049 China
| | - Penglei Wang
- Center for Green Chemistry and Organic Functional Materials Laboratory, Xinjiang Technical Institute of Physics and Chemistry; Chinese Academy of Sciences; Urumqi 830011 China
- Center for Green Chemistry and Organic Functional Materials Laboratory; University of Chinese Academy of Sciences; Beijing 100049 China
| | - Yagang Zhang
- Center for Green Chemistry and Organic Functional Materials Laboratory, Xinjiang Technical Institute of Physics and Chemistry; Chinese Academy of Sciences; Urumqi 830011 China
- Center for Green Chemistry and Organic Functional Materials Laboratory; University of Chinese Academy of Sciences; Beijing 100049 China
- Department of Chemical and Environmental Engineering; Xinjiang Institute of Engineering; Urumqi 830023 China
- Urumqi Longcheng Industrial Co. Limited; Urumqi 830022 China
| | - Xin Zhou
- Center for Green Chemistry and Organic Functional Materials Laboratory, Xinjiang Technical Institute of Physics and Chemistry; Chinese Academy of Sciences; Urumqi 830011 China
- Center for Green Chemistry and Organic Functional Materials Laboratory; University of Chinese Academy of Sciences; Beijing 100049 China
| | - Lu Xu
- Center for Green Chemistry and Organic Functional Materials Laboratory, Xinjiang Technical Institute of Physics and Chemistry; Chinese Academy of Sciences; Urumqi 830011 China
- Center for Green Chemistry and Organic Functional Materials Laboratory; University of Chinese Academy of Sciences; Beijing 100049 China
| | - Lan Zhang
- Center for Green Chemistry and Organic Functional Materials Laboratory, Xinjiang Technical Institute of Physics and Chemistry; Chinese Academy of Sciences; Urumqi 830011 China
- Center for Green Chemistry and Organic Functional Materials Laboratory; University of Chinese Academy of Sciences; Beijing 100049 China
| | - Letao Zhang
- Center for Green Chemistry and Organic Functional Materials Laboratory, Xinjiang Technical Institute of Physics and Chemistry; Chinese Academy of Sciences; Urumqi 830011 China
- Center for Green Chemistry and Organic Functional Materials Laboratory; University of Chinese Academy of Sciences; Beijing 100049 China
| | - Li Liu
- Center for Green Chemistry and Organic Functional Materials Laboratory, Xinjiang Technical Institute of Physics and Chemistry; Chinese Academy of Sciences; Urumqi 830011 China
| | - Xinfeng Guo
- Center for Green Chemistry and Organic Functional Materials Laboratory, Xinjiang Technical Institute of Physics and Chemistry; Chinese Academy of Sciences; Urumqi 830011 China
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Gooneie A, Holzer C. Reinforced local heterogeneities in interfacial tension distribution in polymer blends by incorporating carbon nanotubes. POLYMER 2017. [DOI: 10.1016/j.polymer.2017.07.077] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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15
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Gooneie A, Sapkota J, Shirole A, Holzer C. Length controlled kinetics of self-assembly of bidisperse nanotubes/nanorods in polymers. POLYMER 2017. [DOI: 10.1016/j.polymer.2017.05.010] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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16
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Liu J, Zhang S, Zhao G, Wang G. Numerical and experimental investigations on polymer melt flow phenomenon in a vario-thermal mold cavity. J Appl Polym Sci 2017. [DOI: 10.1002/app.45193] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Jitao Liu
- Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical Materials, School of Chemistry and Chemical Engineering; University of Jinan; Jinan 250022 People's Republic of China
| | - Shuxiang Zhang
- Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical Materials, School of Chemistry and Chemical Engineering; University of Jinan; Jinan 250022 People's Republic of China
| | - Guoqun Zhao
- Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education); Shandong University; Jinan 250061 People's Republic of China
| | - Guilong Wang
- Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education); Shandong University; Jinan 250061 People's Republic of China
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Gooneie A, Schuschnigg S, Holzer C. A Review of Multiscale Computational Methods in Polymeric Materials. Polymers (Basel) 2017; 9:E16. [PMID: 30970697 PMCID: PMC6432151 DOI: 10.3390/polym9010016] [Citation(s) in RCA: 113] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2016] [Revised: 12/07/2016] [Accepted: 12/22/2016] [Indexed: 11/17/2022] Open
Abstract
Polymeric materials display distinguished characteristics which stem from the interplay of phenomena at various length and time scales. Further development of polymer systems critically relies on a comprehensive understanding of the fundamentals of their hierarchical structure and behaviors. As such, the inherent multiscale nature of polymer systems is only reflected by a multiscale analysis which accounts for all important mechanisms. Since multiscale modelling is a rapidly growing multidisciplinary field, the emerging possibilities and challenges can be of a truly diverse nature. The present review attempts to provide a rather comprehensive overview of the recent developments in the field of multiscale modelling and simulation of polymeric materials. In order to understand the characteristics of the building blocks of multiscale methods, first a brief review of some significant computational methods at individual length and time scales is provided. These methods cover quantum mechanical scale, atomistic domain (Monte Carlo and molecular dynamics), mesoscopic scale (Brownian dynamics, dissipative particle dynamics, and lattice Boltzmann method), and finally macroscopic realm (finite element and volume methods). Afterwards, different prescriptions to envelope these methods in a multiscale strategy are discussed in details. Sequential, concurrent, and adaptive resolution schemes are presented along with the latest updates and ongoing challenges in research. In sequential methods, various systematic coarse-graining and backmapping approaches are addressed. For the concurrent strategy, we aimed to introduce the fundamentals and significant methods including the handshaking concept, energy-based, and force-based coupling approaches. Although such methods are very popular in metals and carbon nanomaterials, their use in polymeric materials is still limited. We have illustrated their applications in polymer science by several examples hoping for raising attention towards the existing possibilities. The relatively new adaptive resolution schemes are then covered including their advantages and shortcomings. Finally, some novel ideas in order to extend the reaches of atomistic techniques are reviewed. We conclude the review by outlining the existing challenges and possibilities for future research.
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Affiliation(s)
- Ali Gooneie
- Chair of Polymer Processing, Montanuniversitaet Leoben, Otto Gloeckel-Strasse 2, 8700 Leoben, Austria.
| | - Stephan Schuschnigg
- Chair of Polymer Processing, Montanuniversitaet Leoben, Otto Gloeckel-Strasse 2, 8700 Leoben, Austria.
| | - Clemens Holzer
- Chair of Polymer Processing, Montanuniversitaet Leoben, Otto Gloeckel-Strasse 2, 8700 Leoben, Austria.
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