Department of Mathematics and System Development, Interdisciplinary Graduate School of Science and Technology, Shinshu University, Nagano 380-8553, Japan.
Center for Energy and Environmental Science, Shinshu University, Nagano 380-8553, Japan.
J Colloid Interface Sci. 2018 Nov 1;529:332-336. doi: 10.1016/j.jcis.2018.06.023. Epub 2018 Jun 8.
The size control of nanowindows on the graphene walls is indispensable to develop innovative adsorption and separation technologies. As single wall carbon nanohorn (SWCNH) consists of graphene wall, the permeation of ions through the nanowindows can be evaluated with adsorption measurement. We regulated the nanowindow size by use of mild oxidation at 473-523 K for 20-70 h. The explicit low pressure adsorption hysteresis was observed in the N adsorption isotherms of thus-oxidized SWCNHs, suggesting the window size of 0.3-0.4 nm. Moreover, the aqueous phase adsorption measurement for Li, Na, K, Rb, and Cs indicates that the nanowindow size is smaller than about 0.37 nm, being close to the estimated size from N adsorption.
对石墨烯壁纳米窗的尺寸控制对于开发创新的吸附和分离技术是不可或缺的。由于单壁碳纳米角（SWCNH）由石墨烯壁组成，因此可以通过吸附测量来评估离子通过纳米窗的渗透。我们通过在 473-523 K 下温和氧化 20-70 h 来调节纳米窗的尺寸。在如此氧化的 SWCNH 的 N 吸附等温线上观察到明显的低压吸附滞后，表明窗口尺寸为 0.3-0.4 nm。此外，对于 Li、Na、K、Rb 和 Cs 的水相吸附测量表明，纳米窗的尺寸小于约 0.37 nm，接近从 N 吸附估计的尺寸。
