Generally , the membrane thickness is much larger than the pore dimension . therefore , the resistance of the pore channel was the control resistance of the membrane diffusion process . while the existences of the stephen diffusion and pore interaction well explained the reason why the total membrane surface would be used as the interfacial area through where the mass transport took place 盡管由于膜的厚度比孔的尺寸要大很多, stephen擴(kuò)散以及孔之間的相互作用對(duì)通過膜的總擴(kuò)散阻力影響很小,但它們存在的結(jié)果是使整個(gè)膜表面的氣體濃度趨于一致。