Abstract
We report here the occurrence of uniquely shaped nanoparticles newly discovered in natural ponds. Nanoparticles originate from the Goshiki-numa pond community in Japan, where volcanic activity facilitated the formation of four specific ponds. We built a steric three-dimensional image of nanoparticles by integrating 120 transmission-electron-microscope image fragments obtained from various angle ranges. The thick-walled, cylindrically shaped particle has an outer diameter that measures approximately 40Â nm and a length that measures 70Â nm. A 10-nm-thick wall surrounds a 30Â nm hole located in the particle centre. Particles are composed of an aluminium silicate-based material with an Al2O3:SiO2 ratio of 2:1. They also exhibit an amorphous X-ray diffraction pattern. Although the water solubility characteristics and the infrared spectrum of these newly discovered particles resembles imogolite, these two materials do not have identical structural characteristics.
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The authors gratefully acknowledge funding from the JSPS Grant-in-Aid for Challenging Exploratory Research #15K14198 and the JSPS Grant-in-Aid for Scientific Research (B) # 15H03842.
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Takagai, Y., Abe, R., Endo, A. et al. Unique aluminosilicate-based natural nanoparticles in the volcanogenic Goshiki-numa pond. Environ Chem Lett 14, 565–569 (2016). https://doi.org/10.1007/s10311-016-0592-0
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DOI: https://doi.org/10.1007/s10311-016-0592-0