Influence Factors of Calcium Carbonate Whiskers Prepared by Intermittent Bubbling Method

Abstract

Calcium carbonate whiskers were successfully prepared in the MgC12-Ca(OH)2-CO2 system by a intermittent bubbling method and characterized by X-ray diffraction and scanning electron microscopy. The results demonstrated that aragonite style calcium carbonate whiskers with well morphology, large aspect ratio and smooth surface can be obtained by controlling technical conditions such as reaction temperature, concentration of Ca(OH)2 and amount of additives and under the conditions of CO2 flow velocity of 3.4ml/min/gCa(OH)2, flow of CO2 to air ratio of 1:4, stirring speed of 240 r/min.

Tuning Crystal Polymorphisms and Structural Investigation of Precipitated Calcium Carbonates for CO2 Mineralization

“…Vaterite can be also applied as a coating pigment to ink jet paper due to its higher hydrophilicity relative to calcite . A needle-like aragonite can be applied to lightweight plastics, and the medical, pharmaceutical, and cosmetics industries by altering optical properties or by achieving a high aspect ratio. − …”

Growth of Aragonite CaCO3 Whiskers in a Microreactor with Calcium Dodecyl Benzenesulfonate as a Control Agent

“…Calcium carbonate (CaCO 3 ), one of the most widely existing minerals in nature, has been extensively used in rubber, plastic, printing ink, dope, toothpaste, cosmetics, and food industries. − CaCO 3 has three different crystalline forms: calcite, aragonite, and vaterite. , Aragonite CaCO 3 in the form of a needle-like crystal is regarded as a functional inorganic material that can alter the optical and mechanical properties of pigment, plastics, and paints. − Especially in biologic systems, the crystal lattice of aragonite can be stable with the existence of amino acids in microenvironments, which makes aragonite CaCO 3 a possible biomedical material in the future. − However, among these three anhydrous polymorphs, calcite is the most stable, while aragonite and vaterite are the metastable and unstable forms of CaCO 3 , respectively. − To keep the continuous growth of aragonite CaCO 3 , it is necessary to ensure that the concentrations of the ions are within the metastable region (between the saturation and supersaturation curves), as shown in Figure . Q C is the corresponding ion product, which is represented as where [Ca 2+ ] and [CO 3 2– ] are the concentrations of Ca 2+ and CO 3 2– , respectively.…”