概括
研究人员使用超声波创建了盘状纳米集群. 这些独特的晶体表现出特定的磁性和比散装更大的单元细胞,为新的磁性应用提供了潜力.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
- 固态物理 固态物理
背景情况:
- 纳米集群由于其磁性特性而引起人们的兴趣.
- 在纳米尺度上控制晶体结构和磁性方向是具有挑战性的.
研究的目的:
- 为了合成和描述新的纳米集群.
- 为了研究这些纳米集群的晶体和磁性特性.
主要方法:
- 对水性离子和氨酸的超声波处理.
- 电子衍射用于晶体分析.
- 洛伦茨显微镜用于磁域调查.
主要成果:
- 同度,圆盘形纳米集群的形成 (大约. 宽度为100纳米,厚度为15纳米).
- 粒子呈现出面向的 (001) 晶体,其三角形/六角形单元细胞大于散装的α-cobalt.
- 确定为单磁域粒子,其磁化轴位于 (101) 平面.
结论:
- 超声波提供了一种合成可控形态的纳米集群的方法.
- 独特的晶体结构和磁性特性表明,有潜在的先进磁性材料.
- 进一步研究这些纳米集群的应用是有必要的.
相关概念视频
02:34Structural Isomerism
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
03:02Colors and Magnetism
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.