The polymorph composition of precipitated particles in the early metastable stage was presented as a function of temperature in Fig. 3.Initial ACC transformed to the combination of vaterite and calcite at low temperatures (14 °C to 30 °C).Vaterite polymorph occurs predominantly at 30 °C–40 °C.At intermediate temperatures (40 °C to 50 °C) the …
WhatsApp: +86 18221755073Vaterite as a biomineral has been identified from mollusc pearls, fish otoliths, ascidians, and even human heart valves. As a metastable phase, it is likely to occur as a …
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WhatsApp: +86 18221755073As recent carbon capture and utilization technologies allow scalable production of vaterite, a more reactive CaCO 3 polymorph, we overcome the challenge …
WhatsApp: +86 18221755073Since the 1970s, vaterite was assumed to be a possible precursor phase during the formation of CaCO 3 in sediments (Rowlands and Webster 1971).This assertion was confirmed by experimental observations showing that vaterite forms prior to calcite, at moderate or high supersaturations (Ogino et al. 1987).In addition, now it is well known …
WhatsApp: +86 18221755073While vaterite's hexagonal substructure (a0 ~ 4.1 Å and c0 ~ 8.5 Å) and the organization of the carbonate groups within a single layer is known, conflicting interpretations regarding the ...
WhatsApp: +86 18221755073Of the four polymorphs, calcite, aragonite, vaterite, and amorphous CaCO3, vaterite is the most enigmatic one due to an ongoing debate regarding its structure that has persisted for nearly a...
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WhatsApp: +86 18221755073As a biomineral, vaterite is found in such things as gallstones, fish otoliths, freshwater pearls, and the healed scars of some mollusk shells. But unlike most minerals, vaterite has defied every effort to resolve its crystal structure, stymieing scientists for nearly 100 years. The structure of a mineral crystal is a critically important ...
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WhatsApp: +86 18221755073Vaterite. Vaterite, CaCO3, is classified as a vaterite Group Carbonate. A calcium carbonate mineral with a formula unit identical to — and thus a polymorph of — calcite, vaterite has an orthorhombic crystal system (Calcite forms trigonal crystals) and a pseudocubic crystal habit. vaterite's structure consists of triangular carbonate ion …
WhatsApp: +86 18221755073The widespread application of calcium carbonate is determined by its high availability in nature and simplicity of synthesis in laboratory conditions. Moreover, calcium carbonate possesses highly …
WhatsApp: +86 18221755073Vaterite, a metastable polymorph of calcium carbonate (CaCO 3) 1 is of substantial interest as a naturally occurring biomaterial, and for its use as an additive in various consumer products ...
WhatsApp: +86 18221755073A method for synthesizing stable high-purity vaterite using BOFS and revealing the crystal transition and stabilization mechanism.
WhatsApp: +86 18221755073As a metastable phase, vaterite is involved in the first step of crystallization of several carbonate-forming systems including the two stable polymorphs calcite and …
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WhatsApp: +86 18221755073Organisms generate biominerals such as nacre, shell, bone, and tooth 1,2 by controlling the nucleation, growth, and assembly of inorganic crystals 3,4,5,6,7.The sequences of native biomineral ...
WhatsApp: +86 18221755073Vaterite is the least thermodynamically stable anhydrous calcium carbonate polymorph. Its existence is very rare in nature, e.g., in some rock formations or as a component of biominerals produced by some fishes, crustaceans, or birds. Synthetic vaterite particles are proposed as carriers of active substances in medicines, additives …
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WhatsApp: +86 18221755073The results showed that pure aragonite, calcite and vaterite were formed at low, moderate and high temperatures respectively. A binary mixture of calcite and vaterite was resulted between 150 and 200 °C. The data suggested an unusual conversion of stable calcite to meta stable vaterite at higher temperature in presence of DTPA.
WhatsApp: +86 18221755073The space group of this newly derived vaterite structure is P6 5 22 (no. 179) with Z = 18 and cell dimensions of √3 times in a, and 3 times in c of the previous suggested disordered structure. Comparison of experimental observations of X-ray diffraction patterns, enthalpies of transformation to calcite, and volume change by heat treatment ...
WhatsApp: +86 18221755073Calcium carbonate (CaCO 3 ) microspheres of vaterite polymorph were successfully obtained by combining calcium chloride (CaCl 2 ) and sodium carbonate (Na 2 CO 3 ) in the presence of poly (acrylic acid) (PAA) and sodium dodecyl benzene sulfonate (SDBS). The experimental results suggested that increasing the SDBS concentration could inhibit the …
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WhatsApp: +86 18221755073Various methods are proposed to precipitate vaterite particles, including the conventional solution-solution synthesis, gas-liquid method as well as special routes. Precipitation conditions should be …
WhatsApp: +86 18221755073This work turned industrial waste of magnesium slag (MS) into two value-added products, high-purity vaterite and supplementary cementitious materials, through …
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