Novel insights into nanopore deformation caused by capillary condensation
Novel insights into nanopore deformation caused by capillary condensation
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DOI：
10.1103/physrevlett.101.086104
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发表时间：
2008-08-22
影响因子：
8.6
通讯作者：
Schoen, Martin
中科院分区：
文献类型：
--
作者：
Guenther, Gerrit;Prass, Johannes;Schoen, Martin
通过原位小角度X射线衍射实验和半巨正则系综Monte Carlo模拟，我们证明了被限制在纳米孔内的流体的吸附和冷凝能够使孔壁变形。在低压下，由于流体分子与壁的碰撞引起的排斥相互作用，孔变宽。在毛细冷凝的孔隙突然收缩的吸引力的流体壁的相互作用，而更大的压力，他们再次扩大。这些功能不能单独占孔壁曲率相关的影响，而是要归因于流体壁分散力。
By means of in situ small-angle x-ray diffraction experiments and semi-grand-canonical ensemble Monte Carlo simulations we demonstrate that sorption and condensation of a fluid confined within nanopores is capable of deforming the pore walls. At low pressures the pore is widened due to a repulsive interaction caused by collisions of the fluid molecules with the walls. At capillary condensation the pores contract abruptly on account of attractive fluid-wall interactions whereas for larger pressures they expand again. These features cannot solely be accounted for by effects related to pore-wall curvature but have to be attributed to fluid-wall dispersion forces instead.