An entry from the Inorganic Crystal Structure Database, the world’s repository for inorganic crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the joint CCDC and FIZ Karlsruhe Access Structures service and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

10.25505/fiz.icsd.cc21ytvp

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Supervariate gel transforms into various biominerals in salt solutions

Research Square (Research Square) (2024)

Xinxue Tang Chong Wang Yuk-Tong Cheng Junda Shen Yunchen Long

Abstract We disclose that calcium-based biominerals, particularly hydroxyapatite (as in vertebrate bones and teeth), calcium carbonate (as in plankton and corals), and calcium pyrophosphate (as the cause for pseudogout), can be mineralized from the same precursor—“supervariate” gel, a stable and non-toxic amorphous gel easily prepared by mixing common water-soluble inorganic salt. When dispersed in a Na₂CO₃ or K₂HPO₄ solution, this multi-ionic, “supervariate” gel can selectively form the biomineral calcite (CaCO₃) or hydroxyapatite, respectively. More remarkable reactions happen when the gel is dispersed in a CaCl₂ solution under ambient conditions: dihydrate calcium pyrophosphate (Ca₂P₂O₇·2H₂O, CPP) was produced in the morphologically intact gel matrix. The resulting gel further transforms into hydroxyapatite upon drying at room temperature. Because of the ubiquity of pyrophosphate in organisms, such mild formation of calcium pyrophosphate dihydrate (contrasting the high temperatures needed in other non-enzymatic procedures, e.g., as in condensing phosphoric acid), and its transformation into hydroxyapatite, sheds light on 1) the role of pyrophosphate in life’s origin; 2) key biomineralization mechanisms in physiological processes. We also apply this “supervariate” gel for dental repair and osteogenesis.

Salt solution

Salt lake

10.21203/rs.3.rs-5166210/v1

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The Carbonic Acid Reaction of Phosphogypsum Decomposition Slag in the Three-Phase Fluidized Ded

Advanced materials research (2012)

Yu Hang Chen Ping Li Yang Ren Hang Zhang Long Gui Xie

Through the study on influence factors of the carbonic acid reaction of phosphogypsum decomposition slag in the three-phase fluidized bed, the effect of different factors on the transformation of CaS in the phosphogypsum decomposition slag was discussed. Experiments show that Increasing CO2 gas flow and extending reaction time have benefit for the transformation of CaS. The conversion rate of CaS was increased firstly and then tended to flatten with the increase of the liquid-solid ratio. The rise of reaction temperature has a weak inhibitory effect for the transformation of CaS. Comparing with tank reactor, three-phase fluidized bed reactor is more advantageous to the carbonic acid reaction of phosphogypsum decomposition slag.

Phosphogypsum

Slag (welding)

Fluidized bed combustion

Carbonic acid

10.4028/www.scientific.net/amr.550-553.2921

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