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Directional water transport of Janus membrane- theoretical approach
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DOI：10.1016/j.desal.2025.118577.png)
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Abstract
En 中文
Membranes with asymmetric properties on different sides are called Janus membranes. A typical example is the membrane with the transition from the hydrophilic feed side to the hydrophobic permeate side or vice versa. Janus membranes exhibit unique transport characteristics, such as directional transport of solvents or solutes. There are many reports on Janus membranes for various applications and the number has been increasing recently. However, most of them are on experiments, and there are only a few works on the transport theory. One such work was that of Tian et al. to explain directional transport. In this work, a new attempt is made to explain the directional transport of the Janus membrane by the surface energy change that is caused by the movement of water in a pore in which the contact angle changes from one side to the other. This new approach, based on the Young equation, is simple and does not need the re-entrant structure that was required in Tian's work. Also, the newly developed model equations allow to compute the water flux when it takes place. The model also shows that the Janus membrane with hydrophilic/hydrophobic configuration can greatly improve resistance to pore wetting in membrane distillation.
Keywords:
Janus membrane
Membrane transport
Directional flow
Contact angle
Surface energy