用十二烷基二苯醚二磺酸钠（NaDDBS）通过RNA结合蛋白（RBM）带移实验证明的单壁碳纳米管束的分散机制

RBM band shift-evidenced dispersion mechanism of single-wall carbon nanotube bundles with NaDDBS.

作者信息

Utsumi Shigenori, Kanamaru Mamiko, Honda Hiroaki, Kanoh Hirofumi, Tanaka Hideki, Ohkubo Takahiro, Sakai Hideki, Abe Masahiko, Kaneko Katsumi

机构信息

Department of Chemistry, Faculty of Science, Chiba University, 1-33 Yayoi, Inage, Chiba 263-8522, Japan.

出版信息

J Colloid Interface Sci. 2007 Apr 1;308(1):276-84. doi: 10.1016/j.jcis.2006.12.041. Epub 2006 Dec 16.

DOI:10.1016/j.jcis.2006.12.041

PMID:17204278

Abstract

The dispersion process of single-wall carbon nanotube (SWNT) by using sodium dodecylbenzene sulfonate (NaDDBS) was studied by means of surface tension measurements, ultraviolet-visible (UV-Vis) spectroscopy, scanning electron microscopy (SEM), and transmission electron spectroscopy (TEM). The critical micelle concentration (CMC) and the concentration where the surface tension begins to drop increase by the presence of SWNT. The isotherm of NaDDBS amount adsorbed on SWNT shows the plateau region at 0.2-6 mM and the saturated region above 40 mM. The external surface of SWNT bundle is fully covered with adsorbed NaDDBS at the plateau region, showing that SWNTs can be dispersed with the bundle form. On the other hand, SWNTs are dispersed in individual tubes at the saturated region, where the adsorption amount corresponds to coating of individual tube surfaces with NaDDBS. This dispersion state was confirmed by SEM and TEM observations. The effect of the dispersion state of SWNTs on radial breathing mode in Raman spectrum gave inherent peak shifts, being the in situ evidences on the step-wise dispersion mechanism of the SWNT bundle to the individual tubes.

摘要

通过表面张力测量、紫外可见光谱（UV-Vis）、扫描电子显微镜（SEM）和透射电子光谱（TEM）研究了用十二烷基苯磺酸钠（NaDDBS）对单壁碳纳米管（SWNT）的分散过程。由于SWNT的存在，临界胶束浓度（CMC）和表面张力开始下降时的浓度增加。吸附在SWNT上的NaDDBS量的等温线在0.2 - 6 mM处显示出平台区，在40 mM以上显示出饱和区。在平台区，SWNT束的外表面完全被吸附的NaDDBS覆盖，表明SWNTs可以以束状形式分散。另一方面，在饱和区SWNTs以单根管子形式分散，此时吸附量相当于用NaDDBS覆盖单根管子表面。通过SEM和TEM观察证实了这种分散状态。SWNTs的分散状态对拉曼光谱中径向呼吸模式的影响产生了固有的峰位移，这是SWNT束逐步分散到单根管子的原位证据。