Microtrapping characteristics of single and multi-walled carbon nanotubes
Microtrapping characteristics of single and multi-walled carbon nanotubes
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DOI：
10.1016/j.chroma.2008.01.073
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发表时间：
2008-03-28
影响因子：
4.1
通讯作者：
Mitra, Somenath
中科院分区：
文献类型：
--
作者：
Hussain, Chaudhery Mustansar;Saridara, Chutarat;Mitra, Somenath
碳纳米管（CNTs）具有一些非常理想的吸附剂特性，这使得它们在包括微尺度预富集在内的各种应用中具有吸引力。CNT的主要优点是它们是无孔的，从而消除了与扩散到孔结构中相关的传质阻力。它们的高长径比导致大的比容量，因此它们有可能成为下一代高性能吸附剂。在本文中，我们提出了微陷阱。本文的目的是研究选择的有机化合物的吸附在单壁和多壁纳米管包装或自组装到一个微型吸附剂陷阱。数据表明，碳纳米管显示出非常有利的吸附以及解吸。前者的特征在于相对较大的穿透体积和等量吸附热（Δ H-s，接近64 kJ/mol）。类似地，从CNT的快速解吸通过窄的解吸带宽来证明。从CNT表面消除非管状碳（NTC）是重要的，因为它们降低了这些吸附剂的性能。(C)2008 Elsevier B. V.保留所有权利。
Carbon nanotubes (CNTs) possess some highly desirable sorbent characteristics, which make them attractive for a variety of applications including micro-scale preconcentration. The main advantage of CNTs is that they are non-porous, thus eliminating the mass transfer resistance related to diffusion into pore structures. Their high aspects ratio leads to large specific capacity, consequently they have the potential to be the next generation high performance sorbent. In this paper we present the microtrapping. The objective of this paper was to study the sorption of select organic compounds on single and multi-walled nanotubes either packed or self-assembled onto a micro-sorbent trap. The data show that the CNTs show highly favorable adsorption as well as desorption. The former is characterized by relatively large breakthrough volumes and isosteric heats of adsorption (Delta H-s, close to 64 kJ/mol). Similarly, rapid desorption from CNTs was demonstrated by narrow desorption bandwidth. The elimination of non-tubular carbons (NTC) from the CNT surface is important, as they reduce the performance of these sorbents. (C) 2008 Elsevier B.V. All rights reserved.