Sep 09, 2021 · The EqC is enclosed by a single-layered, semipermeable polytetrafluoroethylene (PTFE) membrane with 10 µm–sized pores, while the CC is enclosed by double-layered PTFE membranes: the inner membrane and the outer membrane with pore sizes 200 nm and 10 µm, respectively (Fig. 1 C and D).