日本地球惑星科学連合2019年大会

講演情報

[J] ポスター発表

セッション記号 M (領域外・複数領域) » M-IS ジョイント

[M-IS10] 結晶成長、溶解における界面・ナノ現象

2019年5月28日(火) 15:30 〜 17:00 ポスター会場 (幕張メッセ国際展示場 8ホール)

コンビーナ:木村 勇気(北海道大学低温科学研究所)、三浦 均(名古屋市立大学大学院システム自然科学研究科)、佐藤 久夫(三菱マテリアル株式会社エネルギー事業センター那珂エネルギー開発研究所)、塚本 勝男(大阪大学大学院工学研究科)

[MIS10-P04] 蛍光プローブによる炭酸塩鉱物の形成/溶解場の2次元可視化

*川野 潤1大澤 康太朗2豊福 高志3,4長井 裕季子4,5田中 淳也6永井 隆哉1 (1.北海道大学大学院 理学研究院、2.北海道大学 理学部、3.海洋研究開発機構、4.東京海洋大学、5.国立科学博物館、6.北海道大学大学院 理学院)

キーワード:可視化、炭酸塩鉱物、pH

To understand the formation or dissolution mechanism of crystal in aqueous solution, it should be important to analyze the local condition of solution just around dissolving or growing crystal. Recently, we have succeeded to visualize the distribution of pH and ionic concentration around carbonate minerals dissolving in inorganic environment, by using the fluorescent probe. In the present study, we have tried to apply this technique to the formation process of calcium carbonate.
Calcium carbonate was synthesized by the counter diffusion method, in which calcium chloride and sodium carbonate solutions were counter-diffused through an agarose gel matrix containing the fluorescent probe like 8-hydroxypyrene-1,3,6-trisul-fonic acid (HPTS). We observed under a microscope that pH in the middle part of gel first increased gradually with time and turn downward after crystals formed. The counter diffusion method with gel media for the carbonate synthesis has attracted attention as a valid tool in the study of biomineralization because the calcification sites in some organisms were recently suggested to have the features of a highly viscous sol or gel matrix. Therefore, the detail observation of the local condition around forming calcium carbonate in gel matrix could provide new insights into the knowledge of biomineralization mechanisms.