通过[Ln60]纳米组装的超强抗兰化
Jie Dong1, Ping Cui1, Peng-Fei Shi1
1Department of Chemistry, Key Laboratory of Advanced Energy Material Chemistry, MOE, and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Nankai University , Tianjin 300071, China.
Journal of the American Chemical Society
|December 15, 2015
概括
研究人员开发了具有独特[Ln60]纳米的新型化物. 这些稳定,多功能材料在催化和磁性应用方面展现出前途,
科学领域:
- 材料科学
- 无机化学
- 纳米技术
背景情况:
- 石是吸,催化和离子交换中使用的重要多孔材料.
- 传统的石通常由,和氧构成.
- 目前尚不知多功能化物化物.
研究的目的:
- 合成和描述新型的化物.
- 研究这些新材料的结构,化学和物理特性.
- 探索它们在催化和磁性技术中的潜在应用.
主要方法:
- 使用兰化离子和氧链体合成兰化 (1·Gd,1·Tb,1·Dy).
- 使用单晶X射线衍射进行结构分析.
- 通过在恶劣水溶液 (沸水,HCl,NaOH) 中处理的化学稳定性的评估.
- 磁性测量,包括磁热效应.
- 用环氧化物进行二氧化碳循环添加的催化活性评估.
主要成果:
- 成功合成并描述了三种具有60核[Ln60]纳米的新型兰坦化.
- 证明了特殊的化学稳定性,在沸水,0.1M HCl和20M NaOH中保持结晶性.
- 在1·Gd中观察到一个很大的磁热效应 (-ΔSm(max) =66.5 J kg(-1) K(-1)).
- 在温和条件下使用环氧化物添加二氧化碳的过程中表现出有效的催化作用.
结论:
- 这项研究报告了第一个多功能化物.
- 这些材料具有显著的稳定性和独特的特性,包括显著的磁热效应和催化能力.
- 这些发现扩大了石化学的范围,为基于石的新型多孔材料开辟了道路.
相关概念视频
03:06Alkali Metals
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
Table 1: Properties of the alkali metals
03:18Nuclear Stability
Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
To hold positively charged protons together in the...
To hold positively charged protons together in the...