单壁碳纳米管的减少共价交联的基本见解
Milan Schirowski1,2, Gonzalo Abellán1,2, Edurne Nuin1
1Chair of Organic Chemistry II , Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) , Henkestrasse 42 , 91054 Erlangen , Germany.
Journal of the American Chemical Society
|February 7, 2018
概括
这项研究使用了还原功能化的共价交联单壁碳纳米管 (SWCNT). 酸连接剂提供了最好的同质性,而二连接剂提高了表面积和热稳定性,从而改善了氧降解反应.
科学领域:
- 材料科学
- 纳米技术
- 化学工程
背景情况:
- 单壁碳纳米管 (SWCNT) 具有独特的特性,但需要为定制的应用程序提供功能.
- 共价交联是提高SWCNT性能和可处理性的关键策略.
- 开发高效和可控的交叉连接方法对于先进的材料设计至关重要.
研究的目的:
- 使用各种二功能的电友链路对SWCNT进行共价交叉连接.
- 在交联SWCNT中比较不同分子支柱 (烯与双烯衍生物) 的有效性.
- 研究连接器结构对功能同质性,表面积,热稳定性和电化学性能的影响.
主要方法:
- 使用负电荷碳纳米管 (KC4) 的SWCNTs的减少功能化.
- 使用的双功能电:p-二,p-二,-4,4'-bis-和1,1'-二-4,4'-bis-盐.
- 通过统计拉曼光谱 (SRS),热重量测量分析与气色谱-质谱 (TG-GC-MS) 以及偏差校正的高分辨率传输电子显微镜 (HR-TEM) 来进行表征.
主要成果:
- 使用衍生物的SWCNT功能化产生了最佳的批量功能化同质性 (Hbulk) 和添加度.
- 烯连接器的功能化程度最高.
- 双连接剂增加了表面积,增强了热稳定性,并在氧降解反应 (ORR) 中提高了电化学性能.
结论:
- 用精心选择的分子链接器进行减少交叉链接是SWCNT功能化的有效策略.
- 连接器的选择对产生的材料的特性有很大影响,包括同质性,表面积和电化学活性.
- 这项工作强调了分子工程在设计新型功能性碳纳米管材料方面的重要性.
更多相关视频
09:28Engineering Molecular Recognition with Bio-mimetic Polymers on Single Walled Carbon Nanotubes
Published on: January 10, 2017
8.6K
09:12Functionalization of Single-walled Carbon Nanotubes with Thermo-reversible Block Copolymers and Characterization by Small-angle Neutron Scattering
Published on: June 1, 2016
9.6K
相关概念视频
02:04Covalently Linked Protein Regulators
9.7K
Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein....
These groups modify specific amino acids in a protein....
9.7K
02:04Covalently Linked Protein Regulators
2.0K
2.0K
02:46Covalent Bonding and Lewis Structures
63.2K
Compared to ionic bonds, which results from the transfer of electrons between metallic and nonmetallic atoms, covalent bonds result from the mutual attraction of atoms for a “shared” pair of electrons.
63.2K
01:29Covalent Bonds
164.7K
Overview
164.7K
02:18Network Covalent Solids
16.2K
Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
16.2K
01:34Crossing Over
172.3K
Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process...
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process...
172.3K