Release of particles by abrasion of CNT composites using a belt sander

[摘要] There have been many reports on the effect of exposure to nanomaterials such as titanium dioxide, silver, and carbon nanotube (CNT) on human health. Several experiments have examined the abrasion of CNT composites, in which CNT nanoparticles are embedded within a resin or rubber matrix, yielding varying results. Separate study of free CNTs and CNT nanoparticles in relation to health is important due to the different physicochemical characteristics of the two types of material. This study investigated the abrasion of CNT composites using a belt sander inside an enclosed chamber, with variation in the applied load and belt sander speed. At lower speeds, the population of particles with diameters of ∼100 nm was observed to increase (cf. mode values of ∼10 nm), and we found a relationship between the amount of the raising dust and the abrasion conditions. From these results, we propose a robust and widely applicable method to create particles of nanomaterial-containing composite materials of various types in order to conduct accelerated exposure assessment studies.

[发布机构] Agency for Health, Safety and Environment, Kyoto University, Japan^1;Graduate School of Engineering, Kyoto University, Japan^2

[效力级别] 医药卫生

[关键词] Accelerated exposure;Applied loads;Cnt composites;Human health;Physicochemical characteristics;Rubber matrix