离心纯化的羧化碳纳米管无表面活性剂悬浮液的表面酸度增加

Elizabeth I. Braun , Rockford Draper , Paul Pantano
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引用次数: 6

摘要

众所周知,表面活性剂悬浮的碳纳米管(CNT)样品可以通过离心纯化来减少团聚物,增加单个分散的碳纳米管。然而,离心并不总是制备用于生物医学应用的碳纳米管样品的协议的一部分。在本研究中,我们利用羧化多壁碳纳米管(cMWCNTs)悬浮在水中而不添加表面活性剂,开发了一种Boehm滴定法来分析离心后的cMWCNT悬浮液,并利用该方法表明,仅需一个低速离心步骤,水中氧化碳材料的表面酸度就会增加~ 40%。未离心和离心的cMWCNT悬浮液表面酸度的显著差异此前未被认识到,这一点很重要,因为已知表面酸度的程度会影响cMWCNT与生物系统的相互作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Enriched surface acidity for surfactant-free suspensions of carboxylated carbon nanotubes purified by centrifugation

It is well known that surfactant-suspended carbon nanotube (CNT) samples can be purified by centrifugation to decrease agglomerates and increase individually-dispersed CNTs. However, centrifugation is not always part of protocols to prepare CNT samples used in biomedical applications. Herein, using carboxylated multi-walled CNTs (cMWCNTs) suspended in water without a surfactant, we developed a Boehm titrimetric method for the analysis of centrifuged cMWCNT suspensions and used it to show that the surface acidity of oxidized carbon materials in aqueous cMWCNT suspensions was enriched by ∼40% by a single low-speed centrifugation step. This significant difference in surface acidity between un-centrifuged and centrifuged cMWCNT suspensions has not been previously appreciated and is important because the degree of surface acidity is known to affect the interactions of cMWCNTs with biological systems.

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