Microfluidic liquid-liquid contactor

A method, comprising:

• situating a first liquid guide on a surface of a first housing portion, the first liquid guide having an inlet, an outlet, and a liquid-conducting layer comprising a porous member, the porous member comprising a first material, the first liquid guide further comprising one or more solid members arranged with the porous member in a stacked arrangement, the liquid-conducting layer extending between the inlet and the outlet;
• situating a second liquid guide on the surface of the first housing portion such that at least a portion of a liquid-conducting layer of the second liquid guide overlaps the liquid-conducting layer of the first liquid guide, and such that when a first liquid flows along the liquid-conducting layer of the first liquid guide and a second liquid flows along the liquid-conducting layer of the second liquid guide, the second liquid contacts the first liquid along the portion of the liquid-conducting layer of the second liquid guide that overlaps the liquid-conducting layer of the first liquid guide, the liquid-conducting layer of the second liquid guide comprising a second material that is different from the first material, the liquid-conducting layer of the second liquid guide extending between an inlet and an outlet of the second liquid guide;
• and
• securing a second housing portion to the first housing portion to enclose the first and second liquid guides.