Refine your search:     
Report No.
 - 
Search Results: Records 1-6 displayed on this page of 6
  • 1

Presentation/Publication Type

Initialising ...

Refine

Journal/Book Title

Initialising ...

Meeting title

Initialising ...

First Author

Initialising ...

Keyword

Initialising ...

Language

Initialising ...

Publication Year

Initialising ...

Held year of conference

Initialising ...

Save select records

Journal Articles

Local crystal structure of nano-manganese-oxide gold adsorbent

Iikubo, Satoshi*; Koyanaka, Hideki*; Shamoto, Shinichi; Takeuchi, Ken*; Kohara, Shinji*; Kodama, Katsuaki; Loong, C.-K.*

Journal of Physics and Chemistry of Solids, 71(11), p.1603 - 1608, 2010/11

 Times Cited Count:8 Percentile:37.53(Chemistry, Multidisciplinary)

The local crystal structure of dried and deuterated nano-manganese-oxide powder samples was studied via atomic pair distribution function analysis of X-ray and neutron powder diffraction data. The protonated sample shows ultrahigh efficiency as a gold adsorbent even from ppt-level aqueous solutions such as seawater. We show that the nano-manganese-oxide particles have an R-MnO$$_{2}$$-type local crystal structure. The possible role of the protons on the surface of the nano-particles is discussed.

Journal Articles

Association of Am with humic substances isolated from river waters with different water quality

Nagao, Seiya*; Fujitake, Nobuhide*; Kodama, Hideki*; Matsunaga, Takeshi; Yamazawa, Hiromi

Journal of Radioanalytical and Nuclear Chemistry, 255(3), p.459 - 464, 2003/03

 Times Cited Count:7 Percentile:45.84(Chemistry, Analytical)

no abstracts in English

Oral presentation

Local structure analysis of a nano-manganese oxide

Iikubo, Satoshi; Koyanaka, Hideki*; Takeuchi, Ken*; Kohara, Shinji*; Loong, C.-K.*; Kodama, Katsuaki; Shamoto, Shinichi

no journal, , 

The crystal structure of a nano-manganese oxide, which has high performance as gold adsorbent from seawater has been determined by using the atomic pair distribution function analysis of X-ray and neutron diffraction data. The results complementarily show that the nano-manganese oxide consists mainly of R-MnO$$_2$$.

Oral presentation

Atomic pair distribution function analysis of a nanostructured manganese oxide gold adsorbent

Iikubo, Satoshi; Koyanaka, Hideki*; Shamoto, Shinichi; Takeuchi, Ken*; Kohara, Shinji*; Kodama, Katsuaki; Loong, C.-K.*

no journal, , 

The crystal structure of a nano-manganese oxide, which has high performance as gold adsorbent from seawater has been determined by using the atomic pair distribution function analysis of X-ray and neutron diffraction data. The results complementarily show that the nano-manganese oxide consists mainly of R-MnO$$_2$$.

Oral presentation

Local structural study of a manganese oxide gold-adsorbent

Iikubo, Satoshi; Koyanaka, Hideki*; Shamoto, Shinichi; Takeuchi, Ken*; Kohara, Shinji*; Kodama, Katsuaki; Loong, C.-K.*

no journal, , 

This nanostructured manganese oxide is a high efficient gold-adsorbent capable of extraction ppt-level of gold in aqueous solutions and seawater. The high ionic selectivity in the extremely diluted solution attracts much attention. Using the atomic Pair Distribution Function (PDF) analysis, we have studied the crystal structure of this nanostructured manganese oxide.

Oral presentation

Structural analysis of nano-transition-metal-oxides

Shamoto, Shinichi; Iikubo, Satoshi; Kodama, Katsuaki; Taguchi, Tomitsugu; Koyanaka, Hideki*; Takeuchi, Ken*; Kohara, Shinji*; Loong, C.-K.*; Proffen, T.*

no journal, , 

Local crystal structures of nano-transition-metal-oxide powder samples, such as manganese oxide and titanium oxide, have been studied by the atomic pair distribution function (PDF) analysis of X-ray and neutron powder diffraction data. For example, the nano-manganese-oxide (nano-Mn-O) sample with unknown crystal structure shows ultrahigh efficiency as a gold adsorbent even from ppt-level aqueous solutions such as the seawater. For the nanomaterials, there are various difficulties to determine the crystallographic parameters. Instead of fitting broad diffraction peaks, the PDF reveals relatively sharp features at short interatomic distances. For example, by analyzing the peak areas in absolute scale, a valence of a manganese ion or an atomic fraction of manganese ion in the nano-Mn-O sample, MnO$$_{x}$$, can be determined.

6 (Records 1-6 displayed on this page)
  • 1