Research Article

Layer-by-Layer Fabrication of PAH/PAMAM/Nano-CaCO3 Composite Films and Characterization for Enhanced Biocompatibility

Figure 1

Allotropic structural cells of calcium carbonate: (a) vaterite, (b) calcite, and (c) aragonite. The neighboring environment of the cation and the cation-oxygen distances are also shown (copyright: Royal Society of Chemistry 2014, order number 1198792 [19]).
(a)
(b)
(c)