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

Figure 2

SEM images of calcium carbonate of (a1–a3) noncross-linked, (b1–b3) low cross-linked, (c1–c3) medium cross-linked, and (d1–d3) highly cross-linked (PAH/PAMAM)_7.5 multilayers.