Dissolution behavior of vaterite spherulite in solutions containing phosphate ions

DOI Web Site 被引用文献3件 参考文献24件
  • SUGIURA Yuki
    Department of Environmental and Resources Engineering, School of Creative Science and Technology, Waseda University
  • ONUMA Kazuo
    National Institute of Advanced Industrial Science and Technology
  • NAGAO Masahiro
    Department of Environmental and Resources Engineering, School of Creative Science and Technology, Waseda University
  • MOMMA Koichi
    Department of Geology and Paleontology, National Museum of Nature and Science
  • KIMURA Yuki
    Institute of Low Temperature Science, Hokkaido University
  • YAMAZAKI Atsushi
    Department of Environmental and Resources Engineering, School of Creative Science and Technology, Waseda University

抄録

Vaterite is a crystalline polymorph of calcium carbonate that exhibits low stability in comparison with the other crystalline polymorphs of calcium carbonate. It often assumes a spherical shape. The physical properties of vaterite are utilized in advanced biomaterials such as drug delivery systems (DDSs). The potential application of vaterite in DDSs demands a comprehensive understanding of its dissolution rate as a function of PO4 concentration. Using in situ optical studies, we analyzed the dissolution behavior of vaterite in a simulated PO4-containing biogenic environment. The varying physicality (i.e., the pseudo-physiological conditions) of vaterite were investigated using high-resolution cryogenic transmission electron microscopy and small-angle X-ray scattering. In addition, we measured the PO4/Ca ratio in each part of vaterite spherulites using field-emission scanning electron microscopy in conjunction with energy-dispersive X-ray spectroscopy and inductively coupled plasma atomic emission spectrometry.<BR>We categorized the vaterite spherulites into three parts—the shell, mantle, and core parts—on the basis of their dissolution behavior and PO4 response. The PO4 response to the dissolution dynamics increases toward the outer part, although the adsorption rate decreases in the presence of PO4 and PO4 fluorescence materials. The composition of the shell part was nearly identical to that of ideal vaterite, whereas the inner part exhibited a high C/Ca ratio and a poorly crystalline phase referred to as vaterite-like material. The dissolution rate of each part was 0.23–1.58 nm/s (shell), 0.63–3.19 nm/s (mantle), and 1.38–5.71 nm/s (core). The vaterite and vaterite-like materials were further identified according to their composition and particle size distribution.

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