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悬浮在二甲基硫酸盐中的单壁碳纳米管和阿加罗斯凝之间的相互作用力
Justin G Clar1, Carlos A Silvera Batista, Sejin Youn
1Department of Environmental Engineering Sciences and ‡Department of Chemical Engineering, University of Florida , Gainesville, Florida 32611, United States.
Journal of the American Chemical Society
|October 30, 2013
概括
和单壁碳纳米管 (SWCNTs) 之间的离子双极相互作用是选择性吸附的关键. 了解这些力量可以提高SWCNT分离产量和选择性.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
- 分离科学 分离科学
背景情况:
- 选择性吸附到阿加罗斯凝上是分离单壁碳纳米管 (SWCNTs) 的关键方法.
- 了解控制这种吸附的相互作用力对于提高分离效率和产量至关重要.
- 现有的模型可能无法完全捕捉复杂的吸附行为.
研究的目的:
- 研究涉及SWCNTs选择性吸附到阿加凝上的特定相互作用力 (范德瓦尔斯力,离子力,疏水力,π-π,离子双极力).
- 阐明阿加罗斯表面特性和表面活性剂 (二硫酸盐 - SDS) 相互作用在SWCNT保留中的作用.
- 确定驱动选择性吸附的主要力量,并了解它们对分离选择性的贡献.
主要方法:
- 使用了不平衡和平衡吸附研究的组合.
- 研究了阿加罗斯表面修饰对SWCNT保留的影响.
- 使用热度计数据来提取有关吸附过程的热力学信息.
主要成果:
- 对阿加凝表面的修改,影响其永久双极时刻,显著减少了SWCNT保留.
- 鉴定出离子双极力是首要的相互作用,它负责将SDS悬浮的SWCNT (作为宏离子) 吸附到agarose上.
- 吸附的选择性归因于纳米管极化性的变化,影响表面活性剂的结构和移动性,这反过来影响吸附和.
结论:
- 离子双极相互作用对于使用阿加凝的SWCNT选择性吸附和分离至关重要.
- 吸附过程是复杂的,并没有被兰迈尔模型充分描述,需要热量计分析以获得热力学见解.
- 对这些相互作用的进一步了解可以为高产量,高选择性SWCNT分离带来优化的协议.
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