JpGU-AGU Joint Meeting 2017

Presentation information

[EJ] Oral

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS11] [EJ] Interface- and nano-phenomena on crystal growth and dissolution

Wed. May 24, 2017 10:45 AM - 12:15 PM A03 (Tokyo Bay Makuhari Hall)

convener:Yuki Kimura(Institute of Low Temperature Science, Hokkaido University), Hitoshi Miura(Graduate School of Natural Sciences, Department of Information and Basic Science, Nagoya City University), Katsuo Tsukamoto(Graduate School of Engineering, Osaka University), Hisao Satoh(Naka Energy Research Laboratory, Mitsubishi Materials Corporation), Chairperson:Yuki Kimura (Institute of Low Temperature Science, Hokkaido University)

11:45 AM - 12:00 PM

[MIS11-04] 2D imaging of pH change around calcium carbonate crystals during dissolution

*Jun Kawano1, Kaede Nishimura1, Takashi Toyofuku2, Yukiko Nagai2, Sachiko Kawada2, Henry Teng3, Takaya Nagai1 (1.Hokkaido University, 2.JAMSTEC, 3.The George Washington University)

Keywords:pH, calcium carbonate, dissolution

To understand the growth and dissolution mechanism of minerals, the pH monitoring of a solution is a useful technique. Actually a number of the previous studies has performed the pH measurements of bulk solution during the growth. However, to clarify the detail process on the surface, regional change of pH just above the crystal surface should be monitored. In the present study, we have tried to obtain two dimensional images of pH change around CaCO3 crystals which inorganically grows or dissolves, by using the fluorescent probe 8-hydroxypyrene-1,3,6-trisul-fonic acid (HPTS) which has been applied for the research on the biogenic calcification of foraminifers. As a result, we succeeded to visualize the two dimensional distribution of pH around dissolved CaCO3 crystal and its change with time, where pH increases above its surface. The results obtained by this technique may provide new insights into not only inorganic growth/dissolution mechanism of CaCO3, but also the vital effect on the biomineralization by comparing with the results for bio-related process.