Tunable Separation of Single-Walled Carbon Nanotubes by Dual-Surfactant Density Gradient Ultracentrifugation  

作　　者：Pei Zhao Erik Einarsson Georgia Lagoudas Junichiro Shiomi Shohei Chiashi Shigeo Maruyama 

机构地区：[1]Department of Mechanical Engineering, The University of Tokyo, Tokyo 113-8656, Japan [2]Global Center of Excellence for Mechanical Systems Innovation, The University of Tokyo, Tokyo 113-8656, Japan [3]Department of Bioengineering, Rice University, Houston, TX 77005, USA

出　　处：《Nano Research》2011年第7期623-634,共12页纳米研究（英文版）

基　　金：Acknowledgements Part of this work was financially supported by Grant- in-Aid for Scientific Research （No. 22226006 and 19054003）, ＂Development of Nanoelectronic Device Technology＂ of New Energy and Industrial Technology Development Organization （NEDO）, and the Global Centers of Excellence （COE） Program ＂Global Center for Excellence for Mechanical Systems Innovation＂. P. Z. acknowledges a scholarship granted by the China Scholarship Council and G. L. acknowledges support from the NanoJapan program funded by the National Science Foundation.

摘　　要：We present a systematic study of the effects of surfactants in the separation of single-walled carbon nanotubes （SWNTs） by density gradient ultracentrifugation （DGU）. Through analysis of the buoyant densities, layer positions, and optical absorbance spectra of SWNT separations using the bile salt sodium deoxycholate （DOC） and the anionic salt sodium dodecyl sulfate （SDS）, we clarify the roles and interactions of these two surfactants in yielding different DGU outcomes. The separation mechanism described here can also help in designing new DGU experiments by qualitatively predicting outcomes of different starting recipes, improving the efficacy of DGU and simplifying post-DGU fractionation.我们在场在由密度坡度 ultracentrifugation (DGU ) 的围单人赛的碳 nanotubes (SWNT ) 的分离的表面活化剂的效果的系统的研究。通过快活的密度，层位置，和用胆汁盐钠 deoxycholate (文档) 和 anionic 的 SWNT 分离的光吸收度系列的分析腌钠 dodecyl 硫酸盐(SDS ) ，我们在产出不同 DGU 结果澄清这二表面活化剂的角色和相互作用。这里描述的分离机制能也在由预言不同开始的配方的结果的品质上设计新 DGU 实验帮助，改进 DGU 的功效并且简化 post-DGU 分别。

关 键 词：Single-walled carbon nanotubes density gradient ultracentrifugation sodium deoxycholate sodium dodecyl sulfate 

分 类 号：O314[理学—一般力学与力学基础] TB383[理学—力学]