Water mediated growth of oriented single crystalline SrCO3 nanorod arrays on strontium compounds

Abstract

Morphology-controlled strontianite nanostructures have attracted interest in various fields, such as electrocatalyst and photocatalysts. Basic additives in aqueous strontium solutions is commonly used in controlling strontianite nanostructures. Here, we show that trace water also serves an important role in forming and structuring vertically oriented strontianite nanorod arrays on strontium compounds. Using in situ Raman spectroscopy, we monitored the structural evolution from hydrated strontium to strontianite nanorods, demonstrating the epitaxial growth by vapor–liquid–solid mechanism. Water molecules cause not only the exsolution of Sr liquid droplets on the surface but also the uptake of airborne CO2 followed by its ionization to CO32−. The existence of intermediate SrHO+–OCO22− phase indicates the interaction of CO32− with SrOH+ in Sr(OH)x(H2O)y cluster to orient strontianite crystals. X-ray diffraction simulation and transmission electron microscopy identify the preferred-orientation plane of the 1D nanostructures as the (002) plane, i.e., the growth along the c-axis. The anisotropic growth habit is found to be affected by the kinetics of carbonation. This study paves the way for designing and developing 1D architecture of alkaline earth metal carbonates by a simple method without external additives at room temperature.

Boosting the stability of perovskites with exsolved nanoparticles by B-site supplement mechanism

“…6a ). As shown, the distinct Raman feature peaks of SrCO 3 (located at 701 cm −1 ), SrMoO 4 (located at 795, 842, and 887 cm −1 ), carbon with lattice defect ( D band, located at 1319 cm −1 ) can be found on the cathode surface of SFNM+0.0Fe-red-GDC 39 , 52 , 53 , whereas only trace amounts of SrMoO 4 peaks were detected on the cathode surface of SFNM+1.2Fe-red-GDC. The emergence of Sr-containing impurities on both spectra confirms the structure decomposition and surface reconstruction on SFNM+0.0Fe-red and SFNM+1.2Fe-red.…”

Enhanced Bacterial Growth by Polyelemental Glycerolate Particles

“…In these quinary glycerolate particles, a small fraction of the secondary phase of strontium carbonate (SrCO 3 ) is detected, but upon multiple STEM-EDS analyses, no significant phase segregation in NiZnMnMgSr-Gly particles was found, indicating that their presence is minimal. The formation of SrCO 3 is possibly due to the high activity of Sr ions with a small amount of CO 2 in air dissolved in the solution and precipitation of SrCO 3 . Similarly, Figure S2 shows the XRD spectrum for NiZn-Gly particles, where a small fraction of zinc carbonate hydroxide ((Zn) 5 (CO 3 ) 2 (OH) 6 ) secondary phase was detected …”

“…The formation of SrCO 3 is possibly due to the high activity of Sr ions with a small amount of CO 2 in air dissolved in the solution and precipitation of SrCO 3 . 40 Similarly, Figure S2 shows the XRD spectrum for NiZn-Gly particles, where a small fraction of zinc carbonate hydroxide ((Zn) 5 (CO 3 ) 2 (OH) 6 ) secondary phase was detected. 41 Figure 2b shows the FTIR spectrum of Ni-Gly particles, confirming the coordination between Ni cations in the glycerol matrix.…”

Of Glasses and Crystals: Mitigating the Deactivation of CaO-Based CO2 Sorbents through Calcium Aluminosilicates

“…Hence, the Ca@Al sorbents deactivate by a combination of a continuous reduction of the fraction of CaO (see below) and the formation of increasingly large and heterogeneously distributed Ca 3 Al 2 O 6 particles that are not effective in mitigating the sintering of CaO . Furthermore, the dendritic shape of the Ca 3 Al 2 O 6 particles is consistent with the outward diffusion of Ca 2+ ions into the Al 2 O 3 overcoat. − …”