通过螺旋直链淀粉的超分子包封实现单壁碳纳米管的增溶

Solubilization of single-wall carbon nanotubes by supramolecular encapsulation of helical amylose.

作者信息

Kim Oh-Kil, Je Jongtae, Baldwin Jeffrey W, Kooi Steven, Pehrsson Pehr E, Buckley Leonard J

机构信息

Chemistry Division, Naval Research Laboratory, Washington, DC 20375-5342, USA.

出版信息

J Am Chem Soc. 2003 Apr 16;125(15):4426-7. doi: 10.1021/ja029233b.

DOI:10.1021/ja029233b

PMID:12683805

Abstract

We have developed a simple, efficient process for solubilization of single-wall carbon nanotubes (SWNTs) with amylose in aqueous DMSO. This process requires two important conditions, presonication of SWNTs and subsequent amylose treatment in an optimum mixture of DMSO/H2O. The former step separates SWNT bundles, and the latter step provides a maximum cooperative interaction of SWNTs with amylose, leading to the immediate and complete solubilization. The best solvent condition for this is around 10-20% DMSO, in which amylose assumes a random conformation or an interrupted helix. This indicates that the amylose helix is not the prerequisite for encapsulation of SWNTs. The SEM and AFM images of the encapsulated SWNTs manifest loosely twisted ribbons wrapping around SWNTs, which are locally intertwined as a multiple twist, but no clumps of the host amylose are seen on SWNT capsules.

摘要

我们开发了一种简单、高效的方法，用于在含水二甲基亚砜（DMSO）中用直链淀粉溶解单壁碳纳米管（SWNTs）。该方法需要两个重要条件，即对SWNTs进行预超声处理以及随后在DMSO/H2O的最佳混合物中进行直链淀粉处理。前一步骤可分离SWNT束，后一步骤可使SWNTs与直链淀粉产生最大程度的协同相互作用，从而实现快速且完全的溶解。对此而言，最佳的溶剂条件是约10 - 20%的DMSO，在这种条件下直链淀粉呈无规构象或间断螺旋结构。这表明直链淀粉螺旋并非包裹SWNTs的先决条件。被包裹的SWNTs的扫描电子显微镜（SEM）和原子力显微镜（AFM）图像显示，松散扭曲的条带缠绕在SWNTs周围，这些条带局部相互缠绕形成多重扭曲，但在SWNT胶囊上未观察到主体直链淀粉的团块。