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Radical scavenging reaction kinetics with multiwalled carbon nanotubes.

Tsuruoka S; Matsumoto H; Koyama K; Akiba E; Yanagisawa T; Cassee FR; Saito N; Usui Y; Kobayashi S; Porter DW; Castranova V; Endo M

Carbon 2015 Mar; 83:232-239

https://doi.org/10.1016/j.carbon.2014.10.009

20045389

Progress in the development of carbon nanotubes (CNTs) has stimulated great interest among industries providing new applications. Meanwhile, toxicological evaluations on nanomaterials are advancing leading to a predictive exposure limit for CNTs, which implies the possibility of designing safer CNTs. To pursue safety by design, the redox potential in reactions with CNTs has been contemplated recently. However, the chemical reactivity of CNTs has not been explored kinetically, so that there is no scheme to express a redox reaction with CNTs, though it has been investigated and reported. In addition, the reactivity of CNTs is discussed with regard to impurities that consist of transition metals in CNTs, which obfuscates the contribution of CNTs to the reaction. The present work aimed at modeling CNT scavenging in aqueous solution using a kinetic approach and a simple first-order reaction scheme. The results show that CNTs follow the redox reaction assumption in a simple chemical system. As a result, the reaction with multiwalled CNTs is semiquantitatively denoted as redox potential, which suggests that their biological reactions may also be evaluated using a redox potential scheme.

Nanotechnology; Toxicology; Exposure-limits; Exposure-levels; Risk-factors; Carbon-compounds; Chemical-reactions; Models; Reaction-rates; Biological-effects

Shuji Tsuruoka, Aquatic Innovation Center, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan

CRBNAH

20150301

Journal Article

s_tsuruoka@shinshu-u.ac.jp

2015

M112014

0008-6223

HELD

Manufacturing

Carbon

WV