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单碳纳米管涂层被单链DNA所取代的动力学取决于纳米管结构

Kunhua Lei¹, Sergei M Bachilo¹, R Bruce Weisman^1,2

¹Department of Chemistry and the Smalley-Curl Institute, Rice University, Houston, Texas 77005, United States.

|August 30, 2023

概括

短的DNA链迅速取代单壁碳纳米管 (SWCNTs) 中的二甲基硫酸盐 (SDS). 移位动力学强烈依赖于DNA长度,SWCNT直径和角,揭示了复杂的表面相互作用.

科学领域:

材料科学材料科学材料科学
纳米技术纳米技术
物理化学物理化学

背景情况:

单壁碳纳米管 (SWCNTs) 因其独特的电子和机械性能而受到广泛研究.
SWCNT的表面功能化对其应用至关重要,像二甲硫酸盐 (SDS) 这样的吸附分子影响其行为.
了解表面位移的动态是控制SWCNT属性和开发新应用的关键.

研究的目的:

为了研究由单链DNA (ssDNA) 寡合体从SWCNT表面中吸附的SDS的位移.
分析这种移位过程对DNA长度,SWCNT直径和角的动力依赖.
提出一种解释观察到的移位现象的动力模型.

主要方法:

时间分辨率光谱学被用来监测SDS的位移.
使用了各种各样的SWCNT结构,直径和角不同.
六种不同的 (GT) _n ssDNA寡合体 (n=3到20) 被引入到涂有SDS的SWCNT中.

主要成果:

排位率显示出对ssDNA寡合体长度的强烈动力依赖,较短的寡合体更快地排位SDS.
在较短的ssDNA中观察到位移速率和SWCNT直径之间的反向关系,在较长的ssDNA中反转.
显著依赖SWCNT奇拉角度,特别是较短的ssDNA,影响移位率.

结论:

涉及SDS破坏和ssDNA形态放松的两步动态模型解释了观察到的结果.
确定速率的步骤从SDS中断转移到基于ssDNA长度的ssDNA放松.
ssDNA,SDS和SWCNT之间的表面相互作用是复杂的,并受到纳米管结构和DNA序列长度的影响.

关键词:

在SWCNT中,奇拉角效应是指形的角度效应.涂层交换动力学涂层交换动力学竞争性的吸附竞争.构造性放松的调整.运动光谱学运动光谱学.在纳米管中,纳米管是纳米管的反体.

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