scholarly journals Local Light‐Controlled Generation of Calcium Carbonate and Barium Carbonate Biomorphs via Photochemical Stimulation

2021 ◽  
Author(s):  
Arianna Menichetti ◽  
Alexandra Mavridi‐Printezi ◽  
Giuseppe Falini ◽  
Patricia Besirske ◽  
Juan Manuel García‐Ruiz ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Barium Carbonate

STUDY OF THE INFLUENCE BETWEEN BARIUM IONS AND CALCIUM IONS ON MORPHOLOGY AND SIZE OF COPRECIPITATION IN MICROEMULSION

2015 ◽  
Vol 22 (03) ◽  
pp. 1550036 ◽  
Author(s):  
NONG WANG ◽  
QING LUO MENG
Keyword(s):  
Calcium Carbonate ◽  
Barium Carbonate ◽  
Spherical Particles ◽  
X Ray Diffraction ◽  
Barium Ions ◽  
Molar Ratios ◽  
Measurement Results ◽  
Inverse Microemulsion ◽  
Barium Ion ◽  
System Phase

In this paper, we systematically drew a series of inverse-microemulsion quasi-ternary system phase diagrams of OP -10+ C 8 H 17 OH + C 6 H 12+ brine  ( CaCl 2/ BaCl 2) by adjusting the ratio of CaCl 2 and BaCl 2. On this basis, microemulsions have been prepared with seven different molar ratios of Ca 2+/ Ba 2+, and calcium carbonate and barium carbonate coprecipitation products were obtained by reaction with an equimolar amount of sodium carbonate. The influence of barium ion to morphology and composition of nanometer calcium carbonate were studied. These samples were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The SEM photographs indicated that when the content of Ca 2+ was higher, some incomplete large cube of coprecipitation particles were formed in solution, but with the content of Ba 2+ increased gradually, they formed a large number of small spherical particles, with the further increase of Ba 2+ concentration, the particles mainly had structures of irregular polyhedron eventually. The measurement results of FTIR and XRD indicated that CaCO 3 coprecipitation products gradually changed from calcite to the vaterite, eventually turned into being aragonite with the further increase of Ba 2+ concentration.

Controlling nucleation in giant liposomes

2014 ◽  
Vol 50 (42) ◽  
pp. 5619-5622 ◽  
Author(s):  
Chantel C. Tester ◽  
Michael L. Whittaker ◽  
Derk Joester
Keyword(s):  
Calcium Carbonate ◽  
Barium Carbonate ◽  
Strontium Carbonate ◽  
Confinement Effects ◽  
Amorphous Calcium Carbonate

Confinement effects in giant liposomes lead to dramatic stabilization of amorphous calcium carbonate (ACC), intermediate stabilization of amorphous strontium carbonate (ASC), but has no effect on the precipitation of barium carbonate.

scholarly journals Co-precipitation of calcium carbonate and barium carbonate at high temperature.

1985 ◽  
Vol 1 (1) ◽  
pp. 37-39 ◽  
Author(s):  
Keiko YOKOFUJITA ◽  
Yuko ISHII ◽  
Kazuyoshi TAKIYAMA
Keyword(s):  
High Temperature ◽  
Calcium Carbonate ◽  
Barium Carbonate ◽  
Co Precipitation

Study on Desulfurization Characteristic of Desulphurizing Coal Water Slurry

2013 ◽  
Vol 807-809 ◽  
pp. 1459-1463
Author(s):  
Chang Xing Shi ◽  
Hai Xiang Tang
Keyword(s):  
Calcium Carbonate ◽  
Barium Carbonate ◽  
Pulverized Coal ◽  
Water Evaporation ◽  
Desulfurization Rate ◽  
Water Slurry ◽  
Coal Water Slurry ◽  
Desulfurization Efficiency ◽  
Reaction Atmosphere

With calcium carbonate and barium carbonate as desulfurizers, combustion desulphurization experiments of coal water slurry and pulverized coal were respectively done in the ZCL. The results show that desulfurization efficiency in coal water slurry is prior to the same pulverized coal. The desulfurization characteristic of desulphurizing coal water slurry was analyzed by comparing the desulfurization efficiency of coal water slurry and pulverized coal. The reaction atmosphere in the boiler is different from the pulverized coal because of water evaporation ,and the CO content was lower ,so the decomposing rate for desulphurization products was reduced,after water evaporated ,it formed microstructures which was considered as favorable to the desulfurization rate .

Using Calcium Carbonate/Hydroxide and Barium Carbonate to Remove Sulphate from Mine Water

2017 ◽  
Vol 36 (2) ◽  
pp. 264-272 ◽  
Author(s):  
Vhahangwele Akinwekomi ◽  
Johannes P. Maree ◽  
Christian Wolkersdorfer
Keyword(s):  
Calcium Carbonate ◽  
Mine Water ◽  
Barium Carbonate ◽  
Carbonate Hydroxide ◽  
Calcium Carbonate Hydroxide

Growth of nanofibrous barium carbonate on calcium carbonate seeds

2008 ◽  
Vol 310 (11) ◽  
pp. 2938-2945 ◽  
Author(s):  
Sara J. Homeijer ◽  
Matthew J. Olszta ◽  
Richard A. Barrett ◽  
Laurie B. Gower
Keyword(s):  
Calcium Carbonate ◽  
Barium Carbonate

scholarly journals Incorporation of Incompatible Strontium and Barium Ions into Calcite (CaCO3) through Amorphous Calcium Carbonate

Minerals ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 270 ◽  
Author(s):  
Ayaka Saito ◽  
Hiroyuki Kagi ◽  
Shiho Marugata ◽  
Kazuki Komatsu ◽  
Daisuke Enomoto ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Room Temperature ◽  
Barium Carbonate ◽  
X Ray Diffraction ◽  
Amorphous Calcium Carbonate ◽  
Static Disorder ◽  
Ionic Radii ◽  
Barium Ions ◽  
Alkaline Earth Elements ◽  
Xrd Patterns

Calcite is a ubiquitous mineral in nature. Heavy alkaline-earth elements with large ionic radii such as Sr2+ and Ba2+ are highly incompatible to calcite. Our previous study clarified that incompatible Sr2+ ions can be structurally incorporated into calcite through crystallization from amorphous calcium carbonate (ACC). In this study, we synthesized Sr-doped calcite with Sr/(Sr + Ca) up to 30.7 ± 0.6 mol% and Ba-doped calcite with Ba/(Ba + Ca) up to 68.6 ± 1.8 mol%. The obtained Ba-doped calcite samples with Ba concentration higher than Ca can be interpreted as Ca-containing barium carbonates with the calcite structure which have not existed so far because barium carbonate takes the aragonite structure. X-ray diffraction (XRD) patterns of the Sr-doped and Ba-doped calcite samples obtained at room temperature showed that reflection 113 gradually weakened with increasing Sr/(Sr + Ca) or Ba/(Ba + Ca) ratios. The reflection 113 disappeared at Ba/(Ba + Ca) higher than 26.8 ± 1.6 mol%. Extinction of reflection 113 was reported for pure calcite at temperatures higher than 1240 K, which was attributed to the rotational (dynamic) disorder of CO32− in calcite. Our Molecular Dynamics (MD) simulation on Ba-doped calcite clarified that the CO32− ions in Ba-doped calcites are in the static disorder at room temperature. The CO32− ions are notable tilted and displaced from the equilibrium position of pure calcite.

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