Fig. 2

Schematic illustration of the LbL assembly method using BPEI, HA, and gold NPs. General strategy for the preparation of the (BPEI/HA/gold NPs/HA)n (n = number of tetralayers) structure-based nanoporous films, and subsequent ova release under model physiological conditions. (Reprinted with permission from Ref. [49]. Copyright 2016, Elsevier)