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Albright T, Hobeck J. Investigating the Electromechanical Properties of Carbon Black-Based Conductive Polymer Composites via Stochastic Modeling. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:nano13101641. [PMID: 37242057 DOI: 10.3390/nano13101641] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2023] [Revised: 04/26/2023] [Accepted: 05/10/2023] [Indexed: 05/28/2023]
Abstract
Conductive polymer composites (CPCs) have shown potential for structural health monitoring applications based on repeated findings of irreversible transducer electromechanical property change due to fatigue. In this research, a high-fidelity stochastic modeling framework is explored for predicting the electromechanical properties of spherical element-based CPC materials at bulk scales. CPC dogbone specimens are manufactured via casting and their electromechanical properties are characterized via uniaxial tensile testing. Model parameter tuning, demonstrated in previous works, is deployed for improved simulation fidelity. Modeled predictions are found in agreement with experimental results and compared to predictions from a popular analytical model in the literature.
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Affiliation(s)
- Tyler Albright
- Alan Levin Department of Mechanical & Nuclear Engineering, Kansas State University, Manhattan, KS 66506, USA
| | - Jared Hobeck
- Alan Levin Department of Mechanical & Nuclear Engineering, Kansas State University, Manhattan, KS 66506, USA
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El Aferni A, Guettari M, Hamdouni A. COVID-19 multiwaves as multiphase percolation: a general N-sigmoidal equation to model the spread. EUROPEAN PHYSICAL JOURNAL PLUS 2023; 138:393. [PMID: 37192840 PMCID: PMC10165586 DOI: 10.1140/epjp/s13360-023-04014-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Accepted: 04/20/2023] [Indexed: 05/18/2023]
Abstract
Abstract The aim of the current study is to investigate the spread of the COVID-19 pandemic as a multiphase percolation process. Mathematical equations have been developed to describe the time dependence of the number of cumulative infected individuals, I t , and the velocity of the pandemic, V p t , as well as to calculate epidemiological characteristics. The study focuses on the use of sigmoidal growth models to investigate multiwave COVID-19. Hill, logistic dose response and sigmoid Boltzmann models fitted successfully a pandemic wave. The sigmoid Boltzmann model and the dose response model were found to be effective in fitting the cumulative number of COVID-19 cases over time 2 waves spread (N = 2). However, for multiwave spread (N > 2), the dose response model was found to be more suitable due to its ability to overcome convergence issues. The spread of N successive waves has also been described as multiphase percolation with a period of pandemic relaxation between two successive waves. Graphical abstract
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Affiliation(s)
- Ahmed El Aferni
- Preparatory Institute of Engineering of Tunis. Materials and Fluids Laboratory, University of Tunis, Tunis, Tunisia
| | - Moez Guettari
- Preparatory Institute of Engineering of Tunis. Materials and Fluids Laboratory, University of Tunis, Tunis, Tunisia
| | - Abdelkader Hamdouni
- The Higher Institute of Sciences and Technologies of the Environnent Borj Cedria, University of Carthage, Carthage, Tunisia
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Luna CBB, do Nascimento EP, Siqueira DD, Soares BG, Agrawal P, de Mélo TJA, Araújo EM. Tailoring Nylon 6/Acrylonitrile-Butadiene-Styrene Nanocomposites for Application against Electromagnetic Interference: Evaluation of the Mechanical, Thermal and Electrical Behavior, and the Electromagnetic Shielding Efficiency. Int J Mol Sci 2022; 23:ijms23169020. [PMID: 36012282 PMCID: PMC9408880 DOI: 10.3390/ijms23169020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2022] [Revised: 07/28/2022] [Accepted: 07/29/2022] [Indexed: 11/22/2022] Open
Abstract
Nylon 6/acrylonitrile-butadiene-styrene nanocomposites were prepared by mixing in a molten state and injection molded for application in electromagnetic interference shielding and antistatic packaging. Multi-wall carbon nanotubes (MWCNT) and maleic anhydride-grafted ABS compatibilizer were incorporated to improve the electrical conductivity and mechanical performance. The nanocomposites were characterized by oscillatory rheology, Izod impact strength, tensile strength, thermogravimetry, current-voltage measurements, shielding against electromagnetic interference, and scanning electron microscopy. The rheological behavior evidenced a severe increase in complex viscosity and storage modulus, which suggests an electrical percolation phenomenon. Adding 1 to 5 phr MWCNT into the nanocomposites produced electrical conductivities between 1.22 × 10−6 S/cm and 6.61 × 10−5 S/cm. The results make them suitable for antistatic purposes. The nanocomposite with 5 phr MWCNT showed the highest electromagnetic shielding efficiency, with a peak of –10.5 dB at 9 GHz and a value around –8.2 dB between 11 and 12 GHz. This was possibly due to the higher electrical conductivity of the 5 phr MWCNT composition. In addition, the developed nanocomposites, regardless of MWCNT content, showed tenacious behavior at room temperature. The results reveal the possibility for tailoring the properties of insulating materials for application in electrical and electromagnetic shielding. Additionally, the good mechanical and thermal properties further widen the application range.
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Affiliation(s)
- Carlos Bruno Barreto Luna
- Academic Unit of Materials Engineering, Federal University of Campina Grande, Av. Aprígio Veloso, 882-Bodocongó, Campina Grande 58429-900, PB, Brazil
- Correspondence:
| | - Emanuel Pereira do Nascimento
- Academic Unit of Materials Engineering, Federal University of Campina Grande, Av. Aprígio Veloso, 882-Bodocongó, Campina Grande 58429-900, PB, Brazil
| | - Danilo Diniz Siqueira
- Academic Unit of Materials Engineering, Federal University of Campina Grande, Av. Aprígio Veloso, 882-Bodocongó, Campina Grande 58429-900, PB, Brazil
| | - Bluma Guenther Soares
- Department of Metallurgic and Materials Engineering, Macromolecules Institute, Federal University of Rio de Janeiro, Rio de Janeiro 21941-598, RJ, Brazil
| | - Pankaj Agrawal
- Academic Unit of Materials Engineering, Federal University of Campina Grande, Av. Aprígio Veloso, 882-Bodocongó, Campina Grande 58429-900, PB, Brazil
| | - Tomás Jeferson Alves de Mélo
- Academic Unit of Materials Engineering, Federal University of Campina Grande, Av. Aprígio Veloso, 882-Bodocongó, Campina Grande 58429-900, PB, Brazil
| | - Edcleide Maria Araújo
- Academic Unit of Materials Engineering, Federal University of Campina Grande, Av. Aprígio Veloso, 882-Bodocongó, Campina Grande 58429-900, PB, Brazil
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Bai Y, Zhou S, Lei X, Zou H, Liang M. Enhanced thermal conductivity of polycarbonate‐based composites by constructing a dense filler packing structure consisting of hybrid boron nitride and flake graphite. J Appl Polym Sci 2022. [DOI: 10.1002/app.52895] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Yang Bai
- The State Key Laboratory of Polymer Materials Engineering Polymer Research Institute, Sichuan University Chengdu China
| | - Shengtai Zhou
- The State Key Laboratory of Polymer Materials Engineering Polymer Research Institute, Sichuan University Chengdu China
| | - Xue Lei
- The State Key Laboratory of Polymer Materials Engineering Polymer Research Institute, Sichuan University Chengdu China
| | - Huawei Zou
- The State Key Laboratory of Polymer Materials Engineering Polymer Research Institute, Sichuan University Chengdu China
| | - Mei Liang
- The State Key Laboratory of Polymer Materials Engineering Polymer Research Institute, Sichuan University Chengdu China
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