SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2022, Vol. 43 ›› Issue (3): 275-281.DOI: 10.1016/j.cjche.2021.03.039

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The role of diffusion in the nucleation of calcium carbonate

Xiangyu Dou1,2,3, Haoyang Huang1,2, Yongsheng Han1,2   

  1. 1. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
    2. School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;
    3. College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
  • 收稿日期:2020-09-27 修回日期:2021-01-04 出版日期:2022-03-28 发布日期:2022-04-28
  • 通讯作者: Yongsheng Han,E-mail:yshan@ipe.ac.cn
  • 基金资助:
    The financial support from National Natural Science Foundation of China (91934302, 21978298, U1862117) and the Innovation Academy for Green Manufacture, Chinese Academy of Sciences (IAGM-2019-A13) is warmly appreciated. This study was supported by the project from the State Key Laboratory of Multiphase Complex Systems (MPCS-2017-A-01) and the MPCS Facility Upgradation Program. We thank Dr. Ying Ren, Dr. Wei Chen and Dr. Chengxiang Li for their discussion to this work.

The role of diffusion in the nucleation of calcium carbonate

Xiangyu Dou1,2,3, Haoyang Huang1,2, Yongsheng Han1,2   

  1. 1. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
    2. School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;
    3. College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
  • Received:2020-09-27 Revised:2021-01-04 Online:2022-03-28 Published:2022-04-28
  • Contact: Yongsheng Han,E-mail:yshan@ipe.ac.cn
  • Supported by:
    The financial support from National Natural Science Foundation of China (91934302, 21978298, U1862117) and the Innovation Academy for Green Manufacture, Chinese Academy of Sciences (IAGM-2019-A13) is warmly appreciated. This study was supported by the project from the State Key Laboratory of Multiphase Complex Systems (MPCS-2017-A-01) and the MPCS Facility Upgradation Program. We thank Dr. Ying Ren, Dr. Wei Chen and Dr. Chengxiang Li for their discussion to this work.

摘要: Nucleation widely exists in nature, from cloud formation to haze generation. The classical nucleation theory (CNT) was created to describe the nucleation process, but it fails to predict many experimental phenomena due to the short consideration of nanoscale phenomena and macroscale dynamics. Although the attachment and detachment of monomers are considered in the developed model of nucleation, the diffusion of chemicals in the bulk is not valued as supersaturation in the nucleation process so far. Here we employ simulation and experimental approaches to investigate how the diffusion of ions affects the nucleation of calcium carbonate. The diffusion of ions is regulated by the viscosity of solvents and the sonication imposed on the solution. It is found that the nucleation rates increased exponentially with the diffusion coefficient of ions, which is beyond the prediction of CNT. This abnormal finding might be ascribed to the involvement of cluster aggregation in the nucleation of calcium carbonate. This study highlights the significance of chemical diffusion in the nucleation process, which may help to revise the nucleation theory and develop solutions for the rational synthesis of materials, as well as for the control of air pollution.

关键词: Calcium carbonate, Nucleation, Simulation, Diffusion, Dynamics

Abstract: Nucleation widely exists in nature, from cloud formation to haze generation. The classical nucleation theory (CNT) was created to describe the nucleation process, but it fails to predict many experimental phenomena due to the short consideration of nanoscale phenomena and macroscale dynamics. Although the attachment and detachment of monomers are considered in the developed model of nucleation, the diffusion of chemicals in the bulk is not valued as supersaturation in the nucleation process so far. Here we employ simulation and experimental approaches to investigate how the diffusion of ions affects the nucleation of calcium carbonate. The diffusion of ions is regulated by the viscosity of solvents and the sonication imposed on the solution. It is found that the nucleation rates increased exponentially with the diffusion coefficient of ions, which is beyond the prediction of CNT. This abnormal finding might be ascribed to the involvement of cluster aggregation in the nucleation of calcium carbonate. This study highlights the significance of chemical diffusion in the nucleation process, which may help to revise the nucleation theory and develop solutions for the rational synthesis of materials, as well as for the control of air pollution.

Key words: Calcium carbonate, Nucleation, Simulation, Diffusion, Dynamics