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In this work, an unsteady‐state strategy for rapid measurement of gas diffusivity in liquid is proposed, which has a quick perturbation of the liquid flow rate in inner tube for obtaining the change of gas flow rate across the membrane with time. The strategy has taken full advantages of the tube‐in‐tube reactor that possesses a high permeability Teflon AF‐2400 membrane to accelerate the diffusion...
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