Fig. 2 | Nature Communications

Fig. 2

From: Microscopic structure of the polymer-induced liquid precursor for calcium carbonate

Fig. 2

CryoTEM observations of CaCO3 thin film formation process with 10 mM CaCl2. ac Images showing the evolution of product morphologies with 25 mg L−1 pAsp at different growth stages. a ~60 nm-sized NP (150–200 min). The inset is a zoom-in image showing the ~2 nm-sized subunits. b Aggregated NPs (200–250 min). c Film aggregated by NPs (250–300 min), with SAED pattern in the inset showing it is amorphous. df Images of products grown with 2.5 g L−1 ds-DNA. d Approximately 30 nm-sized NPs (30–60 min). The inset is a zoom-in image showing the ~2 nm-sized subunits. e Aggregated NPs (60–120 min). f Film aggregated by the NPs (~120 min), with SAED pattern in the inset showing it is amorphous. gk Tomography of a NP grown with 2.5 g L−1 of ds-DNA (30 min). g Tomo tilt series image at 0°. hj Computer-generated cross-section slices with offsets of 0, 4.6, or 21.6 nm from the center of NP in Z-axis, respectively. k A cross-section slice of four NPs attached together (60 min), indicating they are hollow. hk are median-filtered (filter size 3 × 3 × 3 pixels) to remove noise for better visibility. The gold markers for tomography are highlighted by yellow circles in d, e, and g. Some ds-DNA molecules are highlighted by yellow arrows in d, e and hk. Scale bars: c and f: 500 nm. Inset of c and f: 5 nm−1. Other images: 20 nm

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