在CdSe纳米血小板的形成过程中观察到从3D到1D封闭的连续过渡
S Ithurria1, G Bousquet, B Dubertret
1Laboratoire de Physique et d'Etude des Matériaux, UMR8213 CNRS, ESPCI, 10 rue Vauquelin, 75231 Paris Cedex 5, France.
Journal of the American Chemical Society
|February 18, 2011
概括
体化 (CdSe) 纳米板块从微小的种子中生长,保持恒定的厚度,同时横向延伸. 这个过程允许调整维度,并显示从3D到1D量子束的过渡.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
- 物理化学 物理化学
背景情况:
- 体纳米血小板是具有尺寸依赖光学和电子性能的关键纳米材料.
- 了解合纳米板块的生长机制是控制其特性的关键.
- 化 (CdSe) 纳米板块表现出量子束效应.
研究的目的:
- 为了研究合式CdSe纳米板块的形成机制.
- 为了阐明生长动态和产生的纳米血小板尺寸之间的关系.
- 分析纳米板块形成期间电子封闭的演变.
主要方法:
- 传输电子显微镜 (TEM) 用于可视化纳米粒子形态和尺寸.
- 光谱分析 (吸收和光) 探测电子属性.
- 控制的前体注射来调整纳米血小板的尺寸.
主要成果:
- 通过连续横向延伸的小 (<2 nm) 纳米晶体种子形成CdSe纳米板块.
- 纳米板块的厚度是由初始种子尺寸决定的,在生长过程中保持不变.
- 侧面维度可以通过前体添加来调整,从而影响量子限制.
- 光谱数据显示,随着横向生长的发生,从3D限制过渡到1D限制.
- 形成机制在不同的受控厚度中是一致的,直到单层水平.
结论:
- CdSe纳米血小板的生长是一个以种子为媒介的横向延伸过程.
- 精确控制纳米板块厚度和侧面尺寸是可以实现的.
- 这项研究提供了关于纳米材料生长过程中量子束的演变的见解.
相关概念视频
01:22Formation of the Platelet Plug
The platelet phase, the second stage of hemostasis, commences around 15-20 seconds after an injury. It follows and overlaps with the vascular phase, during which blood vessels constrict to minimize blood loss.
As the injured blood vessel contracts, endothelial cells undergo contraction, revealing collagen fibers in the basement membrane and underlying connective tissue. Furthermore, the plasma membrane of endothelial cells becomes adhesive, preparing the site for platelet adhesion. Platelets...
As the injured blood vessel contracts, endothelial cells undergo contraction, revealing collagen fibers in the basement membrane and underlying connective tissue. Furthermore, the plasma membrane of endothelial cells becomes adhesive, preparing the site for platelet adhesion. Platelets...
01:32Pinching-off of Coated Vesicles
Vesicle budding is orchestrated by distinct cytosolic proteins such as adaptor proteins, coat proteins, and GTPases. To initiate vesicle budding, membrane-bending proteins containing crescent-shaped BAR domains bind to the lipid heads in the bilayer and distort the membrane to form a protein-coated vesicle bud. Adaptors proteins such as AP2 for clathrin-coated vesicles can nucleate on the deformed membrane. Finally, coat proteins such as clathrin or COPI and COPII assemble into a coat forming...