arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.00712cond-mat.mtrl-scicond-mat.mes-hall
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氧化石墨烯的力学性能:官能团的影响

Mechanical properties of graphene oxide: the impact of functional groups

Mahdi Tavakol, Abbas Montazeri, S. Hamed Aboutalebi, Reza Asgari

摘要:

本文采用分子动力学模拟对石墨烯替代材料氧化石墨烯(GO)的力学特性进行了系统的研究。为此目的,考虑具有不同浓度的环氧化物和羟基官能团的几种GO样品。结果表明,增加环氧化物覆盖率导致GO系统的机械特性的显著劣化。这种变化与增加环氧化物覆盖率时结构中波纹形成的增加相关。此外,调查系统中的键长,可以得出结论,较高的环氧化物百分比导致单共振键和混合共振键的长度增加,从而导致GO样品的机械性能的整体劣化。此外,我们的研究结果表明,高浓度的官能团可以导致负泊松比。增加羟基的量显示出对杨氏模量的相同的下降效果。在同时含有环氧基和羟基的石墨烯体系中,可以推断,较高百分比的前者可以导致较高的残余应变,因为在体系内形成更多的波纹。

英文摘要:

In the current study, mechanical characteristics of graphene oxide (GO) as a promising substitute of graphene are systematically studied through molecular dynamics simulation. For this purpose, several GO samples having different concentrations of epoxide and hydroxyl functional groups are considered. The results reveal that increasing the epoxide coverage causes a noticeable deterioration in the mechanical characteristics of GO systems. This change is correlated with the increase of the formation of ripples in the structure upon increasing the epoxide coverage. Moreover, investigating the bond lengths in the system, it is concluded that the higher epoxide percentage leads to an increase in the length of single and hybrid resonance bonds leading to an overall deterioration of the mechanical properties of GO samples. Additionally, our results demonstrate that high concentration of functional groups can lead to a negative Poisson ratio. Increasing the amount of hydroxyl groups shows the same declining effect on the Young modulus. In a graphene system containing both epoxide and hydroxyl groups, it is deduced that a higher percentage of the former can result in a higher residual strain because of the formation of more ripples within the system.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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