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The role and implications of bassanite as a stable precursor phase to gypsum precipitation.(REPORTS)(Author abstract)(Report)

Van Driessche, A. E. S. ; Benning, L. G. ; Rodriguez - Blanco, J. D. ; Ossorio, M. ; Bots, P. ; Garcia - Ruiz, J. M.

Science, April 6, 2012, Vol.336(6077), p.69(4) [Tạp chí có phản biện]

ISSN: 0036-8075

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  • Nhan đề:
    The role and implications of bassanite as a stable precursor phase to gypsum precipitation.(REPORTS)(Author abstract)(Report)
  • Tác giả: Van Driessche, A. E. S. ; Benning, L. G. ; Rodriguez - Blanco, J. D. ; Ossorio, M. ; Bots, P. ; Garcia - Ruiz, J. M.
  • Chủ đề: Mineralogical Chemistry -- Research ; Desalination -- Research ; Precipitation (Chemistry) -- Research ; Gypsum -- Chemical Properties
  • Là 1 phần của: Science, April 6, 2012, Vol.336(6077), p.69(4)
  • Mô tả: Calcium sulfate minerals such as gypsum play important roles in natural and industrial processes, but their precipitation mechanisms remain largely unexplored. We used time-resolved sample quenching and high-resolution microscopy to demonstrate that gypsum forms via a three-stage process: (i) homogeneous precipitation of nanocrystalline hemihydrate bassanite below its predicted solubility, (ii) self-assembly of bassanite into elongated aggregates co-oriented along their c axis, and (iii) transformation into dihydrate gypsum. These findings indicate that a stable nanocrystalline precursor phase can form below its bulk solubility and that in the CaS[0.sub.4] system, the self-assembly of nanoparticles plays a crucial role. Understanding why bassanite forms prior to gypsum can lead to more efficient anti-scaling strategies for water desalination and may help to explain the persistence of CaS[0.sub.4] phases in regions of low water activity on Mars. 10.1126/science.1215648
  • Ngôn ngữ: English
  • Số nhận dạng: ISSN: 0036-8075

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