Orientation and alignment control of LDH-containing composite membranes using magnetic processes and their anion conductivity

Abstract Orientation control of layered double hydroxide (LDH) was attempted using magnetic crystalline anisotropy, and alignment control was explored through magnetic dipole interactions. Under an external magnetic field, Mg–Al LDH and Ni–Al LDH oriented, and the LDH composite membrane prepared in the magnetic field showed enhanced anion conductivity in the direction parallel to the LDH layer plane. In Ni–Al LDH, a connected structure was observed due to magnetic dipole interactions; however, improved anion conductivity was not observed, likely due to improper orientation.