Simulations of condensable vapor permeation through sub-nanoscale pores were performed for a virtual amorphous silica membrane, prepared by melt-quenching. The simulated permeation of C2H6-like (TC = 305K) Lennard-Jones particles through an 8Å diameter pore exhibited a surface diffusion-like temperature dependence at 400 to 800K. At around 300K, the permeation decreased with decreasing temperature. A maximum was thus observed in the temperature dependence of permeation. The critical temperature, TC, of the permeating condensable vapor could be a contributing factor in the permeation properties through the micropore. The simulated permeation of C2H6 at 260K decreased with increasing mean pressure. At low pressures, where micropore filling would not be expected to occur, an almost gas-like permeation was observed even at temperatures below the TC. Under micrpore filling conditions at a relatively high pressure, the permeance suddenly decreased. Adsorption simulations were also conducted on the same unit cell, and the mobility of the adsorbed molecules in the micropore filling phase were found to smaller than those in the lower-density phase. It was concluded that development of the micropore filling phase led to a decrease in permeation and that transport - as a condensed filling phase - through the micropore was an activated process.Condensable Vapor Permeation Through Microporous Silica Membranes Studied with Molecular Dynamics Simulation. Yoshioka, T., Tsuru, T., Asaeda, M.: Separation and Purification Technology, 2003, 32[1-3], 231-7