تقرير
Finite-temperature stability of hydrocarbons: fullerenes versus flakes
العنوان: | Finite-temperature stability of hydrocarbons: fullerenes versus flakes |
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المؤلفون: | Perez-Mellor, Ariel Francis, Parneix, Pascal, Calvo, Florent, Falvo, Cyril |
سنة النشر: | 2022 |
المجموعة: | Physics (Other) |
مصطلحات موضوعية: | Physics - Chemical Physics, Physics - Atomic and Molecular Clusters |
الوصف: | The effects of a finite temperature on the equilibrium structures of hydrocarbon molecules are computationally explored as a function of size and relative chemical composition in hydrogen and carbon. Using parallel tempering Monte Carlo simulations employing a reactive force field, we find that in addition to the phases already known for pure carbon, namely cages, flakes, rings and branched structures, strong effects due to temperature and the addition of little amounts of hydrogen are reported. Both entropy and the addition of moderate amounts of hydrogen favor planar structures such as nanoribbons over fullerenes. Accurate phase diagrams are proposed, highlighting the possible presence of multiple phase changes at finite size and composition. Astrophysical implications are also discussed. |
نوع الوثيقة: | Working Paper |
DOI: | 10.1063/5.0122561 |
URL الوصول: | http://arxiv.org/abs/2210.06859 |
رقم الأكسشن: | edsarx.2210.06859 |
قاعدة البيانات: | arXiv |
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