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相关概念视频

Bonding in Metals02:32

Bonding in Metals

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Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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Third Law of Thermodynamics02:38

Third Law of Thermodynamics

19.0K
A pure, perfectly crystalline solid possessing no kinetic energy (that is, at a temperature of absolute zero, 0 K) may be described by a single microstate, as its purity, perfect crystallinity,and complete lack of motion means there is but one possible location for each identical atom or molecule comprising the crystal (W = 1). According to the Boltzmann equation, the entropy of this system is zero.
19.0K
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

17.2K
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...
17.2K
Phase Transitions: Melting and Freezing02:39

Phase Transitions: Melting and Freezing

12.4K
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...
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Stability of Equilibrium Configuration01:23

Stability of Equilibrium Configuration

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Understanding the stability of equilibrium configurations is a fundamental part of mechanical engineering. In any system, there are three distinct types of equilibrium: stable, neutral, and unstable.
A stable equilibrium occurs when a system tends to return to its original position when given a small displacement, and the potential energy is at its minimum. An example of a stable equilibrium is when a cantilever beam is fixed at one end and a weight is attached to the other end. If the weight...
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相关实验视频

Updated: Jul 11, 2025

A Method to Manipulate Surface Tension of a Liquid Metal via Surface Oxidation and Reduction
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A Method to Manipulate Surface Tension of a Liquid Metal via Surface Oxidation and Reduction

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液体固体金属系统的图灵不稳定性

Zerong Xing1,2, Genpei Zhang3,4, Jianye Gao5

  • 1Key Laboratory of Cryogenic Science and Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.

Advanced materials (Deerfield Beach, Fla.)
|November 6, 2023
PubMed
概括
此摘要是机器生成的。

这项研究揭示了液体金属-固体金属系统中图灵模式的新机制. 基于的液体金属与固体金属反应,可以创建复杂的微观结构,如迷宫和条纹.

关键词:
图灵不稳定性就是图灵的不稳定性.竞争的反应 竞争的反应液体 - 固体金属接口形态发生过程是形态发生的过程.反应-扩散系统的反应-扩散系统.

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相关实验视频

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A Method to Manipulate Surface Tension of a Liquid Metal via Surface Oxidation and Reduction
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科学领域:

  • 材料科学 材料科学 材料科学
  • 化学工程是化学工程的重要组成部分.
  • 物理化学 物理化学

背景情况:

  • 经典的图灵形态生成通常发生在由反应-扩散驱动的非金属系统中.
  • 液体金属 (LMs),特别是 (Ga) 基合金,具有与固体金属 (SMs) 合金,扩散和反应等独特特性.

研究的目的:

  • 为了证明液体金属-固体金属反应-扩散系统中的图灵不稳定性和模式形成.
  • 探索金属系统中产生不平衡空间度模式的机制.
  • 研究作为抑制剂和其他金属作为激活剂在图灵模式形成中的作用.

主要方法:

  • 在液体金属-固体金属系统中研究了反应-扩散动力学,使用-合金和银基质 (GaIn-Ag) 作为概念证明.
  • 分析了图灵不稳定的条件,特别是和固体金属的相对扩散速率,以及偏好的反应动力学.
  • 描述了由此产生的图灵图案,包括迷宫,条纹和斑点,并确定形成的金属间化合物.

主要成果:

  • 揭示了在LM-SM反应扩散系统中实现静止图灵图案 (迷宫,条纹,斑点) 的一般机制.
  • 确定图灵不稳定性发生在Ga比固体金属 (X) 扩散快得多,而X优先与基质 (Y) 反应时.
  • 确定了温度和度作为调整模式过程的主导因素,并澄清了金属间化合物和竞争反应的作用.

结论:

  • 该研究提出了金属系统中图灵不稳定的新机制,扩大了超出非金属解决方案的范围.
  • 这种液体金属图灵不稳定机制为构建微结构系统提供了重大机会.
  • 它提供了一条途径,以实验探索使用凝结物质的一般形态发生过程.