Fig. 2: High water content of ACNC.
From: Highly hydrated paramagnetic amorphous calcium carbonate nanoclusters as an MRI contrast agent
a k2-weighted EXAFS and b k2-weighted Fourier transform of the EXAFS for the ACNC, ACC standard, ACC-PAA, ACC-Gd, PAA-Ca, and PAA-Ca/Gd. Dotted black lines are their best fit. c Thermogravimetric curve of ACC and ACC-Gd lyophilized powder isolated by deionized water and then exposed to dry air for over 6 months. The weight loss before 300 °C could be attributed to the loss of water. d The water contents of ACC, ACC-PAA, ACC-Gd, AGC, AGC-PAA, and ACNC according to thermogravimetric (TG) analysis and volumetric Karl Fischer titration measurements (n = 3 independent samples). The data show means ± SD. e Molar ratio of water molecules per mole of CaCO3 in ACC, ACC-PAA, ACC-Gd, and ACNC in comparison with the reported value ranges of additive-free ACC (pink region) and PAA-stabilized ACC (orange region) (n = 3 independent samples). The data show means ± SD. f Molar ratio of water molecules per mole of Gd in AGC, AGC-PAA, ACC-Gd, and ACNC (n = 3 independent samples). The data show means ± SD.
