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

School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou 730070, People's Republic of China

Engineering and Technology Center of Gansu Province for Botanical Pesticides, Lanzhou Jiaotong University, Lanzhou 730070, People's Republic of China

Corresponding author.

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QING LUO MENG

School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou 730070, People's Republic of China

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https://doi.org/10.1142/S0218625X15500365Cited by:5 (Source: Crossref)

Abstract

In this paper, we systematically drew a series of inverse-microemulsion quasi-ternary system phase diagrams of OP-10+C₈H₁₇OH+C₆H₁₂+brine (CaCl₂/BaCl₂) by adjusting the ratio of CaCl₂ and BaCl₂. On this basis, microemulsions have been prepared with seven different molar ratios of Ca²⁺/Ba²⁺, 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 Ca²⁺ was higher, some incomplete large cube of coprecipitation particles were formed in solution, but with the content of Ba²⁺ increased gradually, they formed a large number of small spherical particles, with the further increase of Ba²⁺ concentration, the particles mainly had structures of irregular polyhedron eventually. The measurement results of FTIR and XRD indicated that CaCO₃ coprecipitation products gradually changed from calcite to the vaterite, eventually turned into being aragonite with the further increase of Ba²⁺ concentration.

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