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Huangshan, China

Chen L.,Huangshan NOVEL Co. | Chen L.,Huangshan University | Chen L.,Hefei University of Technology | Jiang J.,Huangshan NOVEL Co. | And 6 more authors.
Russian Journal of Physical Chemistry A | Year: 2013

In this paper, strontium carbonate (SrCO3) and barium carbonate (BaCO3) crystals were synthesized in the presence of an organic additive-hexamethylenetetramine (HMT) using two CO2 sources. Scanning electron microscopy and X-ray powder diffractometry were used to characterize the products. The results showed that the morphologies of orthorhombic strontianite SrCO3 transformed from branch-like to flower-like, and to capsicum-like at last, while the morphologies of BaCO3 change from fiber-like to branchlike, and to rod-like finally with an increase of the molar ratio HMT/Sr2+ and HMT/Ba2+ from 0.2 to 10 using ammonium carbonate as CO2 source. When using diethyl carbonate instead of ammonium carbonate as CO2 source, SrCO3 flowers aggregated by rods and BaCO3 shuttles were formed. The possible formation mechanisms of SrCO3 and BaCO3 crystals obtained in different conditions were also discussed. © 2013 Pleiades Publishing, Ltd. Source


Chen L.,Huangshan NOVEL Co. | Chen L.,Huangshan University | Chen L.,Hefei University of Technology | Bao Z.,Huangshan NOVEL Co. | And 6 more authors.
Chinese Journal of Chemistry | Year: 2012

We report a novel strategy for the green synthesis of calcium carbonate (CaCO 3) microspheres by using four vegetables: potato, cucumber, aubergine, and carrot. The products were characterized by scanning electron microscopy, X-ray powder diffractometry and/or Fourier transform infrared spectroscopy. The results show that the spherical calcite crystals are obtained in the presence of potato, cucumber and aubergine extracts, while uniform vaterite and calcite mixed microspheres are produced with the extracts of carrot. The possible formation mechanism of the CaCO 3 microspheres by using vegetables is also discussed, suggesting that the biomolecules especially proteins may induce and control the nucleation and growth of CaCO 3 crystals. CaCO 3 is an important biomineral and inorganic material. Uniform particles have numerous important applications in many areas. Therefore, this study is very significant not only for expanding the scope of crystal engineering, but also for biomineralization research and green synthesis of functional inorganic materials. Uniform vaterite and calcite mixed microspheres are synthesized by using extract of carrot. Copyright © 2012 SIOC, CAS, Shanghai & WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source


Chen L.,Huangshan University | Chen L.,Hefei University of Technology | Chen L.,Huangshan NOVEL Co. | Zhang H.,Huangshan University | And 5 more authors.
Synthesis and Reactivity in Inorganic, Metal-Organic and Nano-Metal Chemistry | Year: 2012

The synthesis of calcium carbonate (CaCO 3) crystals in the presence of bacteria Escherichia coliform (E. coli) was investigated. The products were characterized by scanning electron microscopy, Fourier transform infrared spectroscopy and X-ray powder diffractometry. The results showed that calcite spherical superstructures constructed from small rhombohedral building units were formed with bacteria, and the particles are much larger than those formed without bacteria. The formation mechanism of CaCO 3 crystals in the presence of E. coli is explored, suggesting that the bacterial biomolecules especially proteins may induce the nucleation, growth, and aggregation of CaCO 3 crystals. © 2012 Copyright Taylor and Francis Group, LLC. Source


Hu F.-K.,Huangshan University | Chen L.,Huangshan University | Chen L.,Huangshan NOVEL Co. | Chen L.,Hefei University of Technology | And 4 more authors.
Synthesis and Reactivity in Inorganic, Metal-Organic and Nano-Metal Chemistry | Year: 2013

The authors studied the synthesis of calcium carbonate (CaCO3) in hexamethylenetetramine (HMT) aqueous solution using diethyl carbonate as CO2 supplier. Scanning electron microscopy and X-ray powder diffractometry were used to characterize the products. The results showed that calcite crystals with rough surface were formed in solution, while calcite polyhedrons and "flowers" were formed at the air/solution interface. The FTIR results indicated a strong interaction between HMT molecules and Ca2+ ions. The possible formation mechanism of the CaCO3 crystals obtained in the solution and at the interface was discussed, which could be explained by mesocrystal assembly. Copyright © Taylor & Francis Group, LLC. Source


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Huangshan Novel Co. | Date: 2011-09-27

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