Molecular dynamics simulations of interaction between sub-bituminous coal and water

Molecular dynamics simulations of interaction between sub-bituminous coal and water
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次烟煤与水相互作用的分子动力学模拟

DOI:
10.1080/08927022.2018.1450981
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发表时间:
2018-03
影响因子:
2.1
通讯作者:
Li Lin
Li Lin
中科院分区:
化学4区
文献类型:
--
作者:
Zhang Wei;He Meng;Wei Hengbin;Zhu Xianchang;You Xiaofang;Lyu Xianjun;Li Lin

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摘要次烟煤的高水分与煤与水的相互作用有关。由于次烟煤的组成和结构复杂,本文采用羟基、羧基和羰基改性的石墨表面作为次烟煤的表面模型。氧原子和氢原子的密度分布表明,煤表面性质影响界面水分子的结构和动力学特性。界面水表现出更多的有序比散装水。水分子与三个氧原子的径向分布函数、均方位移和局域自扩散系数的计算结果表明,水分子更倾向于与羧基发生吸附,且水分子在羟基和羰基上的吸附规律相似。
Abstract The high moisture content of sub-bituminous coal is associated with the interactions between coal and water. Because of complex composition and structure, the graphite surface modified by hydroxyl, carboxyl and carbonyl groups was used to represent the surface model of sub-bituminous coal according to XPS results. Density profiles for oxygen atoms and hydrogen atoms indicate that the coal surface properties affect the structural and dynamic characteristics of the interfacial water molecules. The interfacial water exhibits much more ordering than bulk water. The results of radial distribution functions, mean square displacement and local self-diffusion coefficient for water molecule related to three oxygen moieties confirmed that the water molecules prefer to absorb with carboxylic groups, and adsorption of water molecules at the hydroxy and carbonyl is similar.
DOI: 10.1080/07349349708905135
发表时间: 1997
期刊: Coal Preparation
影响因子: --
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