在原子尺度上对一个分子固体进行成像场驱动的化
Franklin Liou1,2,3, Hsin-Zon Tsai1,2, Zachary A H Goodwin4,5,6
1Department of Physics, University of California at Berkeley, Berkeley, CA, 94720, USA.
Advanced materials (Deerfield Beach, Fla.)
|June 15, 2023
概括
研究人员开发了一种新方法,使用原子分辨率显微镜可视化分子结构中的固体-液体相变. 该技术允许在石墨烯场效应晶体管 (FET) 上对融化和结动态进行成像.
科学领域:
- 表面科学是一门学科.
- 材料科学 材料科学 材料科学
- 物理化学 物理化学
背景情况:
- 固体-液体相变是基本的物理过程.
- 在原子分辨率下捕捉这些转变的全部动态仍然是一个挑战.
- 现有的显微镜技术在成像动态相变方面存在局限性.
研究的目的:
- 开发一种用于控制和成像分子系统中固体-液体相变的新技术.
- 为了实现化和结动态的原子分辨率可视化.
- 研究不平衡融化动态和由此产生的二维平衡状态.
主要方法:
- 使用一个用2,3,5,6-四-7,7,8,8-四亚诺二甲分子装饰的石墨烯场效应晶体管 (FET).
- 应用电场来诱导可逆的固体-液体相位过渡.
- 采用原子分辨率扫描道显微镜来图像相位过渡行为.
- 通过对石墨烯基底部的快速电加热,可视化了不平衡的化动态.
主要成果:
- 在FET表面的分子水平上成功控制和成像可逆的固体-液体相位过渡.
- 观察和可视化了不平衡的化动态和向新的2D平衡状态的演变.
- 根据分子能量水平的光谱测量,开发了一种解释混合状态相的分析模型.
- 蒙特卡洛模拟证实了观察到的不平衡融动态.
结论:
- 开发的技术使得固体-液体相变动力学的前所未有的原子分辨率成像成为可能.
- 装饰FET上的电场控制为研究分子相位行为提供了一个强大的平台.
- 这些发现提供了对不平衡过程和分子系统中二维平衡状态的形成的见解.
相关概念视频
Molecular and Ionic Solids
17.3K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
17.3K
Phase Transitions: Melting and Freezing
12.5K
Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
12.5K
Comparing Intermolecular Forces: Melting Point, Boiling Point, and Miscibility
44.6K
Intermolecular forces are attractive forces that exist between molecules. They dictate several bulk properties, such as melting points, boiling points, and solubilities (miscibilities) of substances. Molar mass, molecular shape, and polarity affect the strength of different intermolecular forces, which influence the magnitude of physical properties across a family of molecules.
Temporary attractive forces like dispersion are present in all molecules, whether they are polar or nonpolar. They...
Temporary attractive forces like dispersion are present in all molecules, whether they are polar or nonpolar. They...
44.6K
The Fluid Mosaic Model
149.2K
The fluid mosaic model was first proposed as a visual representation of research observations. The model comprises the composition and dynamics of membranes and serves as a foundation for future membrane-related studies. The model depicts the structure of the plasma membrane with a variety of components, which include phospholipids, proteins, and carbohydrates. These integral molecules are loosely bound, defining the cell’s border and providing fluidity for optimal function.
149.2K


