Fig. 32. (a) A schematic illustration for MLDH-based drug delivery system toward efficient loading and precisely controlled delivery of theranostic agents. (b) HRTEM image of MLDH nanosheets. (c) AFM image and (d) measured thickness of MLDH nanosheets. (e) Size distribution of MLDH nanosheets in water, PBS, and culture medium (high glucose Dulbecco's modified Eagle medium (DMEM)). (f) XRD patterns of: (1) bulk LDH colloid, (2) MLDH nanosheets colloid, and (3) the restacking sample of MLDH nanosheets. The peak at 26.2° is ascribed to the PET film substrate. (g) XPS spectra of MLDH nanosheets sample. Reproduced with permission from ref. 149. Copyright 2018 John Wiley & Sons, Inc.