Diameter-Dependent Degradation of 11 Types of Carbon Nanotubes: Safety Implications

被引:27
作者
Zhang, Minfang [1 ]
Yang, Mei [1 ]
Nakajima, Hideaki [1 ]
Yudasaka, Masako [2 ,3 ]
Iijima, Sumio [1 ,3 ]
Okazaki, Toshiya [1 ]
机构
[1] Natl Inst Adv Sci & Technol AIST, CNT Applicat Res Ctr, 1-1-1 Higashi, Tsukuba, Ibaraki 3058565, Japan
[2] Natl Inst Adv Sci & Technol AIST, Res Inst Nanomat, 1-1-1 Higashi, Tsukuba, Ibaraki 3058565, Japan
[3] Meijo Univ, Fac Sci & Technol, Tempaku Ku, 1-501 Shiogamaguchi, Nagoya, Aichi 4688502, Japan
基金
日本学术振兴会;
关键词
carbon nanotubes; oxidation; sodium hypochlorite; biodegradation; diameter dependence; HYPOCHLOROUS ACID; INCREASE PRODUCTION; IN-VITRO; BIODEGRADATION; OXIDATION; MACROPHAGES; NEUTROPHILS; MESOTHELIOMA; MECHANISMS; INDUCTION;
D O I
10.1021/acsanm.9b00757
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Understanding the biodegradation profiles of various types of carbon nanotubes (CNTs) is important for their safe use according to their structural characteristics. To investigate the relationship between the biodegradation and the physicochemical properties of CNTs, sodium hypochlorite was used to degrade CNTs because it is believed to be a key oxidizer of CNTs inside macrophages and neutrophils. The complete degradation of CNTs in response to sodium hypochlorite was confirmed, and the half-lives of 11 different types of commercially available single-wall CNTs (SWNTs), carbon nanohorns (CNHs), and multiwall CNTs (MWNTs) in sodium hypochlorite were determined. The degradation of CNTs generally correlated with diameter, as follows: SWNTs >= CNHs > thinner MWNTs > thicker MWNTs. In addition, defects and the degree of dispersion also affected the degradation rate, but these were not the primary factors determining CNT degradation.
引用
收藏
页码:4293 / 4301
页数:17
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