Counter Current Chromatography of Carbon Nanotubes

碳纳米管的逆流色谱法

• 批准号: 457038539
• 负责人: Dr. Benjamin Flavel
• 金额: --
• 依托单位: Institut für Experimentalphysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/457038539?language=en
• 关键词: Counter; Current; Chromatography; Carbon; Nanotubes

For the last 20 years carbon nanotubes (CNTs) have been touted as a material for the future due to their richly varying optical and electronic properties. It is possible to have single, double or multiple carbon walls, where each wall can either be semiconducting or metallic, each possess structure specific optical transitions, have exceptional properties such as high mobilities and environmental stability and come in a range of lengths. However, the initial excitement for CNTs was quickly dampened as it became apparent that it was not possible to selectively synthesize CNTs of arbitrarily defined structure (chirality) in the quantities required by industry. Post synthesis separation offered a solution to this problem, but, the complicated nature of these techniques coupled with small quantities, low yields, poor reproducibility, the use of expensive chemicals and easy structure selectivity only to small diameter semiconducting CNTs continue to hinder the appearance of CNTs in end-user applications. This project provides a solution to these long-standing problems with 3 work packages (WPs) that are aimed at transforming structure (chirality) and enantiomer sorted CNTs (most structures come in both left- and right-handed varieties), regardless of their diameter, wall number or electronic type, into a material that is cheap, large scale, and easy to prepare at large scale. In WP1 this will be achieved with a process known as Counter Current Chromatography (CCC), which will allow for CNTs to be simply injected into a system and sorted CNTs output within minutes. In WP2, CCC will allow for rapid screening of surfactant conditions to extend CNT separation to large diameter CNT species, both semiconducting and metallic, along with double-walled and multi-walled CNTs. WP3 will find new cheap water-based alternatives to the PEG/dextran system and allow for recovery and recycling of the two-phase components. This will ensure that the separation of SWCNTs is not only scalable but also cheap, time effective and industrially attractive.

过去 20 年来，碳纳米管 (CNT) 因其丰富多样的光学和电子特性而被誉为未来的材料。 可以具有单层、双层或多层碳壁，其中每个壁可以是半导体的或金属的，每个壁都具有结构特定的光学跃迁，具有高迁移率和环境稳定性等特殊特性，并且有一定的长度范围。 然而，最初对碳纳米管的兴奋很快就被浇灭了，因为很明显，不可能选择性地合成工业所需数量的任意定义结构（手性）的碳纳米管。 合成后分离为这个问题提供了解决方案，但是，这些技术的复杂性，加上数量少、产量低、重现性差、使用昂贵的化学品以及仅对小直径半导体碳纳米管进行简单的结构选择性，继续阻碍碳纳米管在最终用户应用中的出现。 该项目通过 3 个工作包 (WP) 为这些长期存在的问题提供了解决方案，旨在将结构（手性）和对映异构体排序的 CNT（大多数结构都有左旋和右旋两种类型）转变为廉价、大规模且易于大规模制备的材料，无论其直径、壁数或电子类型如何。 在 WP1 中，这将通过称为逆流色谱 (CCC) 的过程来实现，该过程允许将 CNT 简单地注入系统并在几分钟内对 CNT 输出进行分类。 在 WP2 中，CCC 将允许快速筛选表面活性剂条件，将 CNT 分离扩展到大直径 CNT 种类（半导体和金属）以及双壁和多壁 CNT。 WP3 将找到 PEG/葡聚糖系统的新型廉价水基替代品，并允许回收和再循环两相成分。 这将确保单壁碳纳米管的分离不仅可扩展，而且成本低廉、省时且具有工业吸引力。