Haggenmueller Reto, Rahatekar Sameer S, Fagan Jeffrey A, Chun Jaehun, Becker Matthew L, Naik Rajesh R, Krauss Todd, Carlson Lisa, Kadla John F, Trulove Paul C, Fox Douglas F, Delong Hugh C, Fang Zhichao, Kelley Shana O, Gilman Jeffrey W
National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.
Langmuir. 2008 May 6;24(9):5070-8. doi: 10.1021/la703008r. Epub 2008 Apr 29.
The use of single wall carbon nanotubes (SWCNTs) in current and future applications depends on the ability to process SWCNTs in a solvent to yield high-quality dispersions characterized by individual SWCNTs and possessing a minimum of SWCNT bundles. Many approaches for the dispersion of SWCNTs have been reported. However, there is no general assessment which compares the relative quality and dispersion efficiency of the respective methods. Herein we report a quantitative comparison of the relative ability of "wrapping polymers" including oligonucleotides, peptides, lignin, chitosan, and cellulose and surfactants such as cholates, ionic liquids, and organosulfates to disperse SWCNTs in water. Optical absorption and fluorescence spectroscopy provide quantitative characterization (amount of SWCNTs that can be suspended by a given surfactant and its ability to debundle SWCNTs) of these suspensions. Sodium deoxy cholate (SDOCO), oligonucleotides (GT)(15), (GT)(10), (AC)(15), (AC)(10), C(10-30), and carboxymethylcellulose (CBMC-250K) exhibited the highest quality suspensions of the various systems studied in this work. The information presented here provides a good framework for further study of SWCNT purification and applications.
在当前及未来的应用中，单壁碳纳米管（SWCNT）的使用取决于在溶剂中处理SWCNT以获得高质量分散体的能力，这些分散体的特征是单个SWCNT且具有最少的SWCNT束。已经报道了许多用于分散SWCNT的方法。然而，尚无对各方法的相对质量和分散效率进行比较的综合评估。在此，我们报告了包括寡核苷酸、肽、木质素、壳聚糖和纤维素在内的“包裹聚合物”以及诸如胆酸盐、离子液体和有机硫酸盐等表面活性剂在水中分散SWCNT的相对能力的定量比较。光吸收和荧光光谱法对这些悬浮液进行了定量表征（给定表面活性剂可悬浮的SWCNT量及其解开SWCNT束的能力）。脱氧胆酸钠（SDOCO）、寡核苷酸（GT）(15)、（GT）(10)、（AC）(15)、（AC）(10)、C(10 - 30)和羧甲基纤维素（CBMC - 250K）在所研究的各种体系中表现出最高质量的悬浮液。本文提供的信息为进一步研究SWCNT的纯化和应用提供了良好的框架。
