液体的脆弱性是否嵌入其玻璃的特性?
Tullio Scopigno1, Giancarlo Ruocco, Francesco Sette
1Istituto Nazionale per la Fisica della Materia and Dipartimento di Fisica, Universitá di Roma La Sapienza, 00185 Roma, Italy. tullio.scopigno@phys.uniroma1.it
概括
这项研究揭示了玻璃的振动特性与其脆弱性之间的联系. 这些发现允许从玻璃过渡温度 (Tg) 以下的微观性质中独特地确定玻璃状状态中的脆弱性.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 物理化学 物理化学
背景情况:
- 液体通常在低于点的冷却后结晶.
- 快速冷却可以防止结晶,导致无序的玻璃状状态.
- 玻璃过渡温度 (Tg) 标志着液体失去流动性并表现为固体的点.
研究的目的:
- 研究玻璃相的微观特性与脆弱性概念之间的关系.
- 探索玻璃中的振动特性如何与脆弱性相关.
- 将脆弱性概念扩展到玻璃状状态,并提出其确定方法.
主要方法:
- 实验观察液体冷却和玻璃形成.
- 对玻璃相的振动特性进行分析.
- 振动特性和脆弱性值之间的相关性分析.
主要成果:
- 发现Tg远低于Tg的玻璃的振动特性与其脆弱性之间存在相关性.
- 该研究表明,脆弱性不仅限于液态,还延伸到玻璃状状态.
- 玻璃相的微观特性可以独特地确定脆弱性.
结论:
- 材料的脆弱性可以从其在玻璃状态下的振动特性中确定.
- 这扩大了对脆弱性的理解,超出了液态到玻璃过渡的范围.
- 这些发现为描述无形固体的特性提供了新的视角.
相关概念视频
Cohesion
Cohesion is the attraction between molecules of the same type, such as water molecules. Water molecules have an overall neutral charge but are polar molecule. An oxygen atom in one water molecule has a partial negative charge that can bind to a hydrogen atom with a partial positive charge in a second water molecule, forming a hydrogen bond. Each water molecule can form up to four hydrogen bonds with other water molecules. Hydrogen bonds are responsible for water's cohesive nature.
On a surface,...
On a surface,...
Surface Tension, Capillary Action, and Viscosity
Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
Characteristics of Fluids
When a force is applied parallel to the top surface of a solid, it resists the applied force due to the internal frictional forces between the layers of the solid known as shearing resistance. However, when the force is removed, the shearing forces restore the original shape of the solid. Other deformation forces also cause temporary changes in shape if the forces are not beyond a threshold magnitude. Solids tend to retain their shape, making the study of their rest and motion easier. Beyond...
Stress-Strain Diagram - Brittle Materials
Brittle materials, including glass, cast iron, and stone, exhibit unique characteristics. They fracture without considerable change in their elongation rate, indicating that their breaking and ultimate strength are equivalent. Such materials also show lower strain levels at the point of rupture. The failure in brittle materials predominantly results from normal stresses, as evidenced by the rupture created along a surface perpendicular to the applied load. These materials do not display...
Characteristics of Fluids
Fluids differ from solids primarily in their molecular structure and stress response. Solids have tightly packed molecules with strong intermolecular forces, maintaining their shape and resisting deformation. In contrast, fluids have molecules spaced farther apart with weaker forces, allowing them to flow and deform easily.
Fluids, which include both liquids and gases, are substances that deform continuously under shearing stress. For example, water and oil are liquids with molecules that can...
Fluids, which include both liquids and gases, are substances that deform continuously under shearing stress. For example, water and oil are liquids with molecules that can...
Surface Tension of Fluid
Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
Surface tension varies with...
Surface tension varies with...


