Submicronic calcite particles with controlled morphology tailored by polymer skeletons via carbonation route with compressed or supercritical CO2

Investigation of particulate matter performances in relation to chalk selection in classroom environment

“…24,25 XRD pattern of all chalks were recorded and shown in Figure 3 (right panel) to obtain the information about polymorphic forms of CaCO 3 and CaSO 4 . XRD pattern of chalks 1 and 2 matches with that of calcite 26,27 and in case of 3 and 4, it matches with that of gypsum. 28 Thermogravimetric characteristics shown in Figure 4, of chalks 1 and 2, matches with CaCO 3 while that of 3 and 4 matches with CaSO 4 (Industrial specification of gypsum, Industrial specification of calcium carbonate).…”

Biomimetic Controlling of CaCO3 and BaCO3 Superstructures by Zwitterionic Polymer

“…42,43 While for the other particle in Figure 5a, the clear and order lattice fringes in HRTEM reveal that the particle is well crystallized, and the dspacing is 3.02 Å, corresponding to the (104) faces of calcite (Figure 5c). 37 The single-crystalline SAED pattern with sharp faculae also reveals that the crystal has high crystallographic orientation. The faculae are assigned to (104), (102), and (006) faces of calcite, suggesting ACC transforms to calcite gradually during the mineralization process.…”

“…However, when the mineralization time is very long, the dissolution of defected crystals becomes much stronger, and the growth of new crystals is weakened because of a decrease in Ca 2+ ions, which has already been demonstrated by previous reports. 37,48 Therefore, both defected and perfect crystals would be sharply etched in the later stage, which can be certified by the products generated after 36 h reaction ( Figure 6k and Figure S4h, Supporting Information). The rugged surface disappears, and instead, the sunken and relatively smooth surface with some textured structure is formed because of the strong fusion for all parts of the crystal.…”

Fabrication of BaCO3 sheaves tailored by carboxymethyl cellulose under compressed CO2

“…On the other hand, when the carbonation route with supercritical CO 2 was adopted, due to the fast carbonation rate, CMC chains acted as ''direct skeletons'' and the ions in the reaction system attached onto the polymer skeletons to grow in situ [27]. Herein, we chose CMC as the crystal modifier of BaCO 3 crystals under compressed CO 2 and tried to figure out the effect of CMC on regulating the unique morphology of BaCO 3 crystals.…”

“…Owing to the convenience, low cost and the possible contribution to greenhouse effect, the carbonation route with compressed or supercritical CO 2 developed fast in recent years. As described by our group previously, submicronic CaCO 3 particles with ellipsoidal morphology were synthesized under compressed/supercritical CO 2 [27]. Besides, many other reports [28][29][30] were based on the fabrication of carbonate crystals using carbonation route with supercritical CO 2 .…”