通过连接体工程调整单体金属有机框架的机械性能
Xing Duan1, Lihui Feng1, Dong Wu2
1Center of Advanced Optoelectronic Materials and Devices, Key Laboratory of Novel Materials for Sensor of Zhejiang Province, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, Zhejiang 310018, China; Key Laboratory of Materials for High Power Lasers, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China.
Journal of colloid and interface science
|November 1, 2023
概括
具有像-COOH这样的庞大的功能组的单体金属有机框架 (MOF) 的联体工程增强了机械性能. 这种修改提高了对变形的抵抗力,这对于这些先进材料的工业应用至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
- 化学工程是化学工程的重要组成部分.
背景情况:
- 单立体金属有机框架 (MOF) 由于更好的机械稳定性和可加工性,比工业用途的粉末具有优势.
- 了解MOF结构和机械性能之间的关系对于优化其在应用中的性能至关重要.
研究的目的:
- 研究不同功能组 (-NH2, -2OH, -2COOH) 对sol-gel合成的单质UiO-66 (MOF) 材料的机械性能的影响.
- 评估连接体工程如何影响单体MOF的机械行为和变形阻力.
主要方法:
- 使用sol-gel方法合成单质UiO-66型MOFs,修改了-NH2,-2OH和-2COOH的功能组.
- 纳米缩技术被用来测量机械性能,如硬度 (H) 和弹性模量 (E).
- 用77K的吸附-脱吸异热体来分析孔隙结构和表面积 (BET). 进行了爬行和跳跃痕测试.
主要成果:
- 与 -NH2 (0.334 GPa / 11.959 GPa) 和 -2OH (0.331 GPa / 10.251 GPa) 修改的MOF相比,2COOH功能化的单质MOF表现出明显更高的硬度 (0.589 GPa) 和弹性模量 (15.471 GPa).
- 较大,体积较大的功能组 (-2COOH) 减少了BET表面积和孔径.
- 入试验证实, -COOH 修饰增强了对不可逆转的塑料变形的抵抗力,并减少了激活体积,表明受限孔塌.
结论:
- 具有较大,体积较大的功能组的配体工程,特别是-COOH,显著提高了单质MOF的机械性能.
- 孔隙体积的减少和受限的孔隙崩有助于改善-COOH改性单体MOF的机械强度.
- 这些发现对于在需要高机械稳定性的工业环境中设计和应用坚固的单体MOF至关重要.
相关概念视频
02:51Metal-Ligand Bonds
20.8K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
20.8K
00:43Complexometric Titration: Ligands
964
Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
964