在单壁碳纳米管表面表面表面活性剂结构的和
Juan G Duque1, Crystal G Densmore, Stephen K Doorn
1Chemistry Division, Physical Chemistry and Applied Spectroscopy Group (C-PCS), Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States.
Journal of the American Chemical Society
|October 27, 2010
概括
表面活性剂在单壁碳纳米管 (SWNTs) 上的结构反应会随着度的增加或移动性的限制而和. 这种和会影响SWNT的分离和调,密度梯度超离心和光谱学证实了这一点.
科学领域:
- 材料科学 材料科学 材料科学
- 表面化学 表面化学
- 纳米技术 纳米技术
背景情况:
- 单壁碳纳米管 (SWNTs) 具有独特的电子特性,受到表面吸附物的影响.
- 表面活性剂吸附在SWNT分散和分离中起着至关重要的作用.
- 了解表面活性剂的动态反应是控制SWNT行为的关键.
研究的目的:
- 研究SWNT表面上表面活性剂结构动态的限制行为.
- 探索表面活性剂度和电解质选对SWNT-表面活性剂相互作用的影响.
- 定义和描述表面活性剂结构反应的和.
主要方法:
- 密度梯度超离心 (DGU) 探测表面活性剂吸附和重组.
- 光谱学分析SWNT光发光的变化.
- 用二甲基硫酸盐 (SDS) 和化 (NaCl) 进行定位,以诱导重组力.
主要成果:
- 在金属SWNT上SDS吸附在半导体SWNT之前显示有限的重组能力.
- 在NaCl定位后,半导体SWNT中的光发光强化随着SDS度的增加而减少.
- 观察到表面活性剂结构反应和,其特点是SDS负荷和重定位能力降低.
- 发现和是可逆的,并由SDS移动性受限制引起.
结论:
- 该研究定义并证实了SWNTs的表面活性剂结构反应和.
- 结果与SDS-SWNT相互作用的分子动力学模拟一致.
- 这些发现对使用共表面活性剂系统调整基于密度的SWNT分离有意义.
更多相关视频
09:12Functionalization of Single-walled Carbon Nanotubes with Thermo-reversible Block Copolymers and Characterization by Small-angle Neutron Scattering
Published on: June 1, 2016
09:28Engineering Molecular Recognition with Bio-mimetic Polymers on Single Walled Carbon Nanotubes
Published on: January 10, 2017
相关概念视频
01:30Micelles
Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...
01:27Surface Active Agents
Surfactants, named for their behavior at interfaces, positively adsorb at the interfaces of two phases, reducing interfacial tension. Their versatility as emulsifiers, detergents, and foaming agents stems from this ability. Surfactants, often termed amphiphiles, share the property of amphipathy, with molecules having both hydrophilic and hydrophobic portions. The hydrophilic part is called the head, and the hydrophobic part, including an elongated alkyl substituent, forms the tail.Surfactants...