Fig. 4 | Nature Communications

Fig. 4

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

Fig. 4

Physico-chemical evolution of reaction solutions with 2.5 g L−1 ds-DNA, 10 mM CaCl2, and slow stirring (100 r.p.m.). a Liquid-state 31P NMR spectra of a neat 2.5 g L−1 ds-DNA solution, and reaction solutions at different growth stages. b Chemical shifts and peak widths of the spectra in a, which are labeled by black squares and orange circles connected by lines, respectively. c Volume averaged particle sizes and count rates of reaction solutions at different growth stages derived from DLS measurements, and corresponding zeta potentials, which are labeled by magenta circles, blue triangles, and black squares connected by lines, respectively. The data were obtained by averaging 10 measurements of each sample, and the error bars represent the standard deviations. d pH/[Ca2+] curves of the reaction solution and corresponding d(pH)/dt derivative curves. The two changes in slope in the pH and [Ca2+] curves at 117 and 157 min are highlighted by orange-dashed lines, respectively

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