Chemical speciation analysis for amorphous boron and precipitated boron carbide in sintered boron-added carbon nanotubes

Mikio Ishikuro, Yoshinori Sato, Kazuyuki Tohji, Kazuaki Wagatsuma

Research output: Contribution to journalArticlepeer-review

Abstract

The separation method and the determination of amorphous boron and boron carbide in carbon nanotubes (CNTs) were investigated. The boron carbide was precipitated in the CNTs when they were sintered after adding amorphous boron. The carbon nanotubes and boron carbide were not dissolved, whereas the amorphous boron could be dissolved with 7 N nitric acid. After dissolving amorphous boron in CNTs with 7 N nitric acid, residual boron carbide and CNTs were separated by filtration with a membrane filter. The separated insoluble boron carbide and CNTs on the filter were fused with molten sodium carbonate in a platinum crucible. The concentrations of boron in the filtrate and the insoluble residue were determined by inductively coupled plasma-optical emission spectrometry. It was found that the amount of the precipitated boron carbide increased along with an increase in the addition amount of boron and the rise of the temperature. The amount of unreacted amorphous boron in the CNTs was only a little.

Original languageEnglish
Pages (from-to)807-811
Number of pages5
JournalBUNSEKI KAGAKU
Volume60
Issue number10
DOIs
Publication statusPublished - 2011

Keywords

  • Amorphous boron
  • Carbon nanotubes
  • Chemical speciation
  • Precipitated boron carbide

ASJC Scopus subject areas

  • Analytical Chemistry

Fingerprint

Dive into the research topics of 'Chemical speciation analysis for amorphous boron and precipitated boron carbide in sintered boron-added carbon nanotubes'. Together they form a unique fingerprint.

Cite this