Fig. 5 | Nature Communications

Fig. 5

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

Fig. 5

Compositional evolution of mineral phases with 2.5 g L−1 ds-DNA, 10 mM CaCl2 and slow stirring (100 r.p.m.). a ATR-FTIR spectra of ds-DNA and the 2, 3, 5 h samples, respectively. The peaks corresponding to ds-DNA, ACC or calcite are labeled by black, orange and blue-dashed lines and numbers, respectively. The peaks that are shared by ACC and calcite are labeled by magenta-dashed lines and numbers. b 31P CP-MAS SS-NMR spectra of Ca2+/ds-DNA complex, and the 2, 3, 5 h samples, and ds-DNA. The signals (black lines) are deconvoluted into two peaks at ~−2 p.p.m. (peak 1) and at ~−5 p.p.m. (peak 2), which are indicated by blue and orange-dashed lines, respectively. c Chemical shifts of peak 1 and 2, and peak 2/peak 1 ratios of the spectra in b, which are labeled by black squares, orange circles, and blue triangles connected by lines, respectively

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