Hydrogen and Hydrocarbon Gases, Polycyclic Aromatic Hydrocarbons, and Amorphous Carbon Produced by Multiple Shock Compression of Liquid Benzene up to 27.4 GPa
Hydrogen and Hydrocarbon Gases, Polycyclic Aromatic Hydrocarbons, and Amorphous Carbon Produced by Multiple Shock Compression of Liquid Benzene up to 27.4 GPa
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DOI：
10.1021/acs.jpca.7b06627
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发表时间：
2017-08-31
影响因子：
2.9
通讯作者：
Nishida, Tamihito
中科院分区：
文献类型：
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作者：
Mimura, Koichi;Nishida, Tamihito
本文报道了苯的相图，这些数据主要是在不同压力温度、P-T条件下的静态压缩数据。然而，在相图的高压区和高温区的数据很少。为了了解苯在该区域的物理和化学行为，利用直接分析冲击样品的恢复实验系统对苯的多次冲击压缩进行了评估。冲击样品由剩余的苯、气体(H-2、CH4、C2H4、C2H6、C3H6和C3H8)、相对分子质量从128(萘)到300(冠烯)的多环芳烃和无定形碳组成。这些化学物种的丰度随着冲击压缩引起的P-T条件的不同而变化。在相图中a-C：H相的较低压力和较低温度区域的样品中含有大量的苯和无定形碳。在a-C：H相的高压高温区，苯主要转化为无定形碳(H/C=0.2)、H-2和CH4。因此，本研究中的无定形碳是由一种不同于以前检测到氢化无定形碳(H/C=1)的途径产生的。对于地球科学来说，本研究可以提供与生命起源有关的地外有机物质向早期地球输送的基本信息。
Phase diagrams of benzene have been reported on the basis of data mainly obtained from static compression at various pressure temperature, P-T, conditions. However, there are few data in the high-pressure and high temperature-region of the phase diagram. To understand the physical and chemical behavior of benzene in that region, multiple shock compression of benzene was evaluated by a recovery experimental system that directly analyzed the shocked samples. The shocked samples were composed of the remaining benzene, gases (H-2, CH4, C2H4, C2H6, C3H6, and C3H8), polycyclic aromatic hydrocarbons with molecular weights from 128 (naphthalene) to 300 (coronene), and amorphous carbon. The abundances of these chemical species varied according to the P-T conditions induced by shock compression. Samples in the lower-pressure and, lower-temperature region of the a-C:H phase in the phase diagram contained a significant amount of benzene as well as amorphous carbon. In the higher-pressure and higher-temperature region of the a-C:H phase, benzene was mostly converted into amorphous carbon (H/C = 0.2), H-2, and CH4. Therefore, the amorphous carbon in the present study was produced by a different pathway than that in previous studies that have detected hydrogenated amorphous carbon (H/C = 1). For earth sciences, the present study can provide basic information on the delivery to the early earth of extraterrestrial organic materials related to the origin of life.