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Heat Transfer Research

Publicou 18 edições por ano

ISSN Imprimir: 1064-2285

ISSN On-line: 2162-6561

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 1.7 To calculate the five year Impact Factor, citations are counted in 2017 to the previous five years and divided by the source items published in the previous five years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) 5-Year IF: 1.4 The Immediacy Index is the average number of times an article is cited in the year it is published. The journal Immediacy Index indicates how quickly articles in a journal are cited. Immediacy Index: 0.6 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.00072 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.43 SJR: 0.318 SNIP: 0.568 CiteScore™:: 3.5 H-Index: 28

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THERMAL CONDUCTIVITY OF NAFION MOLECULAR CHAIN BASED ON FIRST-PRINCIPLE CALCULATION

Volume 51, Edição 12, 2020, pp. 1123-1133
DOI: 10.1615/HeatTransRes.2020033107
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RESUMO

The thermal conductance in Nafion molecular chain is investigated by VASP, Phonopy, and ShengBTE based on the first-principle calculation. By using the mechanical structural analysis and chemical bond analysis of crystal orbital overlap population, the strength of carbon-carbon bond, carbon-oxygen bond, and carbon-sulfur bond is discussed. Combined with the pDOS (phonon density of state) analysis, we have determined that the backbone linked by carbon-carbon bonds is always the main route of phonon transport in the Nafion molecular chain, and the branches with sulfonate ions also play a non-negligible phonon transfer role in the local molecular chains. The results of thermal conductivity calculation prove the above analysis that the thermal conductivity of the Nafion molecular chain is much higher than that of the bulk/ membrane, but still at a lower level [< 7 W/(m·K)]. The relationship between the structure and thermal conductivity is further discussed by comparing the Nafion structure and exemplary two-dimensional material structure (silicene and 12C/13C graphene superlattice).

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