Control of crystal polymorphs by a ‘latent inductor’: crystallization of calcium carbonate in conjunction with in situ radical polymerization of sodium acrylate in aqueous solution

Abstract

Three different crystal polymorphs of CaCO 3 (aragonite, vaterite and calcite) have been selectively induced by changing the time of addition of a radical initiator to a calcium carbonate solution containing sodium acrylate.

Preparation and Characterization of Cellulose-CaCO3 Composites by an Eco-Friendly Microwave-assisted Route in a Mixed Solution of Ionic Liquid and Ethylene Glycol

“…The results show the typical bands of cellulose at 1062 cm -1 (the C-O in cellulose) and CaCO3 at approximately 1486 cm -1 (ν3-3 CO3 2-and ν3-4 CO3 2-) (Nelson and Featherstone 1982). More importantly, the characteristic peaks of calcite are observed at 715 and 871 cm -1 (Nelson and Featherstone 1982), while the typical band of aragonite near 855 cm -1 is also observed (Naka et al 2000). These results further indicate the mixed phases of calcite and aragonite that existed in the composites, which is consistent with the XRD results.…”

Microscopic Studies of Calcium Sulfate Crystallization and Transformation at Aqueous–Organic Interfaces

“…The discovery of simple, low-energy pathways for the growth of highly desirable and unstable polymorphs with vital industrial and biological applications is particularly important. [1][2][3][4][5][6][7][8][9][10] Numerous examples of high level control over polymorphism have been established for both organic [1][2][3] and inorganic [4][5][6][7][8] crystal systems. In particular, the calcium carbonate crystal system has been extensively studied.…”

“…In particular, the calcium carbonate crystal system has been extensively studied. [4][5][6][7]9,10 Crystal growth additives such as natural proteinmimics 4,10 and polymers [5][6][7] are commonly used to achieve the growth of the metastable polymorphs, vaterite and aragonite, at much lower temperatures than otherwise possible.…”

Polymorphic and Morphological Transformations of CaCO₃ under CO₂ Atmosphere and under the Influence of EDTA at 60 °C

“…Due to this reason, vaterite gets converted into calcite in due course of time following the 'step rule'. Earlier reports suggest that the crystal structure and morphology depend on several parameters such as supersaturation, solvents, additives, etc [16][17][18][19][20][21].…”

“…Addition of chemical reagents like chelating agents is one of the most common practices in internal water treatment process [23]. These chelating agents form complex with Ca 2+ and other scale forming ions and inhibit the formation of scale to a great extent [17][18][19][20].…”