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首页> 外文会议>2014 40th Annual Northeast Bioengineering Conference >Diameter dependent degradation of single walled carbon nanotubes
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Diameter dependent degradation of single walled carbon nanotubes

机译：单壁碳纳米管的直径依赖性降解

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This study investigates the degradation of single walled carbon nanotubes via chemical method (3:1 ratio of sulfuric acid to nitric acid) and enzymatic method by Horseradish peroxidase (HRP). Two sets of carbon nanotubes (CNTs), pristine and carboxylated (functionalized) CNTs were used for degradation studies. Chemical degradation of CNTs was conducted using pristine CNTs whereas enzymatic degradation by HRP was conducted using both pristine and carboxylated CNTs. Chemical degradation of pristine CNTs was observed within one hour whereas enzymatic degradation of carboxylated CNTs was observed after 20 days. No observable degradation was noticed for enzymatic degradation of pristine CNTs. The CNT diameter dependence for degradation was studied using Radial Breathing Mode (RBM) of the Raman spectra for CNTs[1]. Three distinct RBM peaks corresponding to three different diameter CNTs were observed, i.e. the sample contained at least three different types of CNTs varying in diameter. It was observed that smaller and medium diameter CNTs were degraded more than the larger diameter CNTs via chemical degradation whereas a reverse trend of larger diameter CNTs being degraded was observed for enzymatic degradation.
机译：本研究通过化学方法（硫酸与硝酸的比例为3：1）和辣根过氧化物酶（HRP）的酶促方法研究了单壁碳纳米管的降解。两组碳纳米管（CNT），即原始碳纳米管和羧化（功能化）CNT被用于降解研究。 CNT的化学降解是使用原始CNT进行的，而HRP的酶促降解是同时使用原始和羧基化的CNT进行的。在一小时内观察到原始CNT的化学降解，而20天后观察到羧化CNT的酶降解。没有观察到原始碳纳米管的酶降解可观察到的降解。利用碳纳米管的拉曼光谱的径向呼吸模式（RBM）研究了降解碳纳米管的直径依赖性[1]。观察到对应于三种不同直径的CNT的三个不同的RBM峰，即，样品包含至少三种不同类型的直径变化的CNT。观察到较小和中等直径的CNT通过化学降解比较大直径的CNT降解更多，而对于酶降解，观察到较大直径的CNT被降解的相反趋势。

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