However, after the conversion to ZrP, the 30 nm substrate is the most filled with AcAc-Zr. However, the substrates with pore sizes of 100 nm, 70 nm, and 50 nm failed to be filled, resulting in no transparency change, unlike the change shown in the pictures in Fig. . ). For the ZrP membrane, the characteristic peak at 1250 cm -1 is due to stretching vibration by P-O-H, the absorption peak at 1620 cm -1 is due to the asymmetric stretching vibration of O-H in the layered crystal of α-ZrP, and the peak at 596 cm is due to Zr-O bonding , . The peaks at 596 cm -1 and at 530 cm -1 are due to Zr-O bonding and PO4 -, respectively . membranes have sharp peaks at 2θ = 21.6° and 24.0°, derived from the PE substrate , . On the other hand, ZrP membranes have peaks at 2θ = 11.4°, 19.9°, 25.0°, and 34.0°, regardless of the pore size. These peaks correspond to the (002), ( ), (112), and (303) lattice planes of α-ZrP crystal . The lattice constant corresponding to 2θ = 11.4°