Phase Transformation of Magnesium Amorphous Calcium Carbonate (Mg-ACC) in a Binary Solution of Ethanol and Water

2012 ◽  
Vol 13 (1) ◽  
pp. 59-65 ◽  
Author(s):  
Yang-Yi Liu ◽  
Jun Jiang ◽  
Min-Rui Gao ◽  
Bo Yu ◽  
Li-Bo Mao ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Calcium Carbonate ◽  
Binary Solution ◽  
Amorphous Calcium Carbonate

The roles of water and polyelectrolytes in the phase transformation of amorphous calcium carbonate

2008 ◽  
Vol 310 (16) ◽  
pp. 3779-3787 ◽  
Author(s):  
Xu-Rong Xu ◽  
An-Hua Cai ◽  
Rui Liu ◽  
Hai-Hua Pan ◽  
Rui-Kang Tang ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Calcium Carbonate ◽  
Amorphous Calcium Carbonate

Direct Synthesis of Hollow Vaterite Nanospheres from Amorphous Calcium Carbonate Nanoparticles via Phase Transformation

2008 ◽  
Vol 112 (30) ◽  
pp. 11324-11330 ◽  
Author(s):  
Anhua Cai ◽  
Xurong Xu ◽  
Haihua Pan ◽  
Jinhui Tao ◽  
Rui Liu ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Calcium Carbonate ◽  
Direct Synthesis ◽  
Amorphous Calcium Carbonate

scholarly journals Mechanisms of Phase Transformation and Creating Mechanical Strength in a Sustainable Calcium Carbonate Cement

2020 ◽  
Author(s):  
Jesús Rodríguez-Sánchez ◽  
Teresa Liberto ◽  
Catherine Barentin ◽  
Dag Kristian Dysthe
Keyword(s):  
Phase Transformation ◽  
Calcium Carbonate ◽  
Mechanical Strength ◽  
Cement Paste ◽  
Volume Fraction ◽  
Solid Volume Fraction ◽  
Fractal Model ◽  
Amorphous Calcium Carbonate ◽  
Carbonate Cement ◽  
In Situ Xrd

Calcium carbonate cements have been synthesized by mixing amorphous calcium carbonate and vaterite powders with water to form a cement paste and study how mechanical strength is created during the setting reaction. In-situ XRD was used to monitor the transformation of ACC and vaterite phases into calcite and a rotational rheometer was used to monitor the strength evolution. There are two characteristic time scales of the strengthening of the cement paste. The short timescale of the order 1 hour is controlled by smoothening of the vaterite grains, allowing closer and therefore adhesive contacts between the grains. The long timescale of the order 10-50 hours is controlled by the phase transformation of vaterite into calcite. This transformation is, unlike in previous studies using stirred reactors, found to be mainly controlled by diffusion in the liquid phase. The evolution of shear strength with solid volume fraction is best explained by a fractal model of the paste structure.

scholarly journals Reentrant phase transformation from crystalline ikaite to amorphous calcium carbonate

CrystEngComm ◽  
2018 ◽  
Vol 20 (21) ◽  
pp. 2902-2906
Author(s):  
Zhaoyong Zou ◽  
Luca Bertinetti ◽  
Wouter J. E. M. Habraken ◽  
Peter Fratzl
Keyword(s):  
Phase Transformation ◽  
Calcium Carbonate ◽  
Porous Structure ◽  
Amorphous Calcium Carbonate ◽  
Multi Level

Micrometer-sized metastable amorphous calcium carbonate with a multi-level interconnected porous structure is transformed from highly hydrated crystalline ikaite by fast dehydration.

Acceleration and inhibition effects of phosphate on phase transformation of amorphous calcium carbonate into vaterite

2012 ◽  
Vol 98 (1) ◽  
pp. 262-270 ◽  
Author(s):  
Y. Sugiura ◽  
K. Onuma ◽  
Y. Kimura ◽  
K. Tsukamoto ◽  
A. Yamazaki
Keyword(s):  
Phase Transformation ◽  
Calcium Carbonate ◽  
Amorphous Calcium Carbonate

scholarly journals Mechanisms of Phase Transformation and Creating Mechanical Strength in a Sustainable Calcium Carbonate Cement

Materials ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 3582
Author(s):  
Jesús Rodríguez-Sánchez ◽  
Teresa Liberto ◽  
Catherine Barentin ◽  
Dag Kristian Dysthe
Keyword(s):  
Phase Transformation ◽  
Calcium Carbonate ◽  
Mechanical Strength ◽  
Cement Paste ◽  
Volume Fraction ◽  
Solid Volume Fraction ◽  
Fractal Model ◽  
Amorphous Calcium Carbonate ◽  
Carbonate Cement ◽  
Carbonate Cements

Calcium carbonate cements have been synthesized by mixing amorphous calcium carbonate and vaterite powders with water to form a cement paste and study how mechanical strength is created during the setting reaction. In-situ X-ray diffraction (XRD) was used to monitor the transformation of amorphous calcium carbonate (ACC) and vaterite phases into calcite and a rotational rheometer was used to monitor the strength evolution. There are two characteristic timescales of the strengthening of the cement paste. The short timescale of the order 1 h is controlled by smoothening of the vaterite grains, allowing closer and therefore adhesive contacts between the grains. The long timescale of the order 10–50 h is controlled by the phase transformation of vaterite into calcite. This transformation is, unlike in previous studies using stirred reactors, found to be mainly controlled by diffusion in the liquid phase. The evolution of shear strength with solid volume fraction is best explained by a fractal model of the paste structure.

Anhydrous amorphous calcium carbonate (ACC) is structurally different from the transient phase of biogenic ACC

2019 ◽  
Vol 55 (48) ◽  
pp. 6946-6949 ◽  
Author(s):  
Chieh Tsao ◽  
Pao-Tao Yu ◽  
Chin-Hsuan Lo ◽  
Chung-Kai Chang ◽  
Chia-Hsin Wang ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Phase Transformation ◽  
Water Vapor ◽  
Calcium Carbonate ◽  
Pressure Range ◽  
Ambient Pressure ◽  
Transient Phase ◽  
Amorphous Calcium Carbonate ◽  
X Ray

An in situ ambient pressure soft X-ray spectroscopic study of the phase transformation of ACC exposed to water vapor in the mbar pressure range in conjunction with heat treatment.

Sign in / Sign up

Export Citation Format

Share Document