Japan Geoscience Union Meeting 2023

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[J] Oral

S (Solid Earth Sciences ) » S-CG Complex & General

[S-CG48] Petrology, Mineralogy & Resource Geology

Fri. May 26, 2023 1:45 PM - 3:00 PM 301A (International Conference Hall, Makuhari Messe)

convener:Yu Nishihara(Geodynamics Research Center Ehime University), Keisuke Fukushi(Institute of Nature & Environmental Technology, Kanazawa University), Tatsuo Nozaki(Submarine Resources Research Center, Research Institute for Marine Resources Utilization, Japan Agency for Marine-Earth Science and Technology), Yui Kouketsu(Department of Earth & Planetary Sciences, Graduate School of Environmental Studies, Nagoya University), Chairperson:Tatsuo Nozaki(Submarine Resources Research Center, Research Institute for Marine Resources Utilization, Japan Agency for Marine-Earth Science and Technology), Keisuke Fukushi(Institute of Nature & Environmental Technology, Kanazawa University)

2:30 PM - 2:45 PM

[SCG48-10] Amorphous nanoparticles: the essence of clay

*Katushiro Tsukimura1, Kazuko Manpuku1, Youko Miyoshi1, Tetsuichi Takagi1, Masaya Suzuki1, Shin-ichi Wada2 (1.The National Institute of Advanced Industrial Science and Technology, 2.Kyushu University)

Keywords:Amorphous nanoparticles, Clay, Plasticity

Research on clays has focused on phyllosilicate clay minerals such as kaolinite and smectite because these phyllosilicate minerals were considered the most important substance in clays. On the other hand, amorphous nanoparticles were largely ignored because they were thought to be absent in most clays and to have no effect on clay properties. However, a recent study has revealed that large amounts of amorphous nanoparticles are present in clays and that these amorphous nanoparticles influence some of the important properties of clays. In this study, we have quantitatively shown that plasticity, the most important property of clay, is positively correlated with the weight percent of amorphous nanoparticles in clay and soil. This indicates that the minerals that impart plasticity are not phyllosilicate minerals but amorphous nanoparticles, indicating that the essence of clay is amorphous nanoparticles.