Synthesis and Characterization of Porous CaCO3 Vaterite Particles by Simple Solution Method

Abstract

Appropriately engineered CaCO3 vaterite has interesting properties such as biodegradability, large surface area, and unique physical and chemical properties that allow a variety of uses in medical applications, mainly in dental material as the scaffold. In this paper, we report the synthesis of vaterite from Ca(NO3)2·4H2O without porogen to obtain a highly pure and porous microsphere for raw material of calcium phosphate as the scaffold in our future development. CaCO3 properties were investigated at two different temperatures (20 and 27 °C) and stirring speeds (800 and 1000 rpm) and at various reaction times (5, 10, 15, 30, and 60 min). The as-prepared porous CaCO3 powders were characterized by FTIR, XRD, SEM, TEM, and BET methods. The results showed that vaterite with purity 95.3%, crystallite size 23.91 nm, and porous microsphere with lowest pore diameter 3.5578 nm was obtained at reaction time 30 min, temperature reaction 20 °C, and stirring speed 800 rpm. It was emphasized that a more spherical microsphere with a smaller size and nanostructure contained multiple primary nanoparticles received at a lower stirring speed (800 rpm) at the reaction time of 30 min. One of the outstanding results of this study is the formation of the porous vaterite microsphere with a pore size of ~3.55 nm without any additional porogen or template by using a simple mixing method.

Effect of eggshell/N,N-dimethylformamide (DMF) mixing ratios on the sonochemical production of CaCO3 nanoparticles

“…Contrarily, larger volume of solvent enhances the solvent extraction capability, preventing early saturation and enabling a higher production of nano-CaCO 3 [40]. The crystallite sizes of ES-1 and ES-2 (18.07 and 23.08 respectively) are close to the crystalline size of nano-CaCO3 particles that were synthesized through the precipitation of dissolved Ca(NO 3 )2•4H 2 O [44]. This indicates a possible production of nano-CaCO 3 particles from ES-1 and ES-2.…”

Spatiotemporal based response for methylene blue removal using surface modified calcium carbonate microspheres coated with Bacillus sp.

“…CaCO 3 microspheres are characterized by their large surface area. 41 The core–shell preparations such as that for CaCO 3 microspheres. 9 Core-shell 2-layer model form layers that can be tightly or loosely bound, this helps in the removal of adsorbates.…”

Various polymorphs of calcium carbonate and poly(ethylene) glycol as thermal energy storage materials

“…The XRD patterns of the starting raw materials, polymorphs of CaCO 3, and the produced PEG-CaCO 3 blends 110), ( 112), (104), and (202) crystallographic planes of vaterite, respectively. 51,54 There is still ambiguity regarding the crystal structure of vaterite, which consists of a predominantly hexagonal structure along with at least one other coexisting crystallographic structure. 55 As shown in Figure 3, it can be said that the synthesized polymorphs were all pure and had no other impurities.…”