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本文采用分子动力学方法,模拟了流体在晶面结构为FCC100、FCC110、FCC111壁面上的吸附现象,结果表明壁面结构对粒子的吸附有较大的影响。在相同的条件下,三种晶面结构的吸附区产生的吸附作用力不相同,FCC110结构壁面的吸附粒子更贴近壁面,FCC111结构壁面吸附的粒子最多。在纳米尺度下定义壁面相对光滑度来表征壁面结构对粒子的吸附影响。随着纳米通道壁面的相对光滑度减小,壁面的吸附作用力减小,壁面吸附的粒子数减少,吸附数密度降低,吸附的粒子贴近壁面。最后提出了一种推测纳米通道吸附最优孔径的方法。
In this paper, molecular dynamics simulation is used to simulate the adsorption of fluid on the surface of FCC100, FCC110 and FCC111. The results show that the wall structure has a great influence on the adsorption of particles. Under the same conditions, the adsorption forces of the three kinds of crystal structure adsorption area are different, the adsorption particles on FCC110 structure wall are closer to the wall surface, and the FCC111 structure surface adsorption is the most. The relative smoothness of the wall is defined at the nanometer scale to characterize the adsorption effect of the wall structure on the particles. As the relative smoothness of the nanochannel wall decreases, the adsorption force on the wall decreases, the number of adsorbed particles on the wall decreases, the adsorption number density decreases, and the adsorbed particles close to the wall. Finally, a method of estimating the optimal pore size of nanochannels is proposed.