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相关概念视频

Radical Formation: Addition00:47

Radical Formation: Addition

2.3K
Radicals can be formed by adding a radical to a spin-paired molecule. This is typically observed with unsaturated species, where the addition of a radical across the π bond leads to the production of a new radical by dissolving the π bond. For example, the addition of a Br radical to an alkene yields a carbon-centered radical.
Similar to charge conservation in chemical reactions, spin conservation is implicit for radical reactions. Accordingly, the product formed must possess an...
2.3K
Phase Transitions02:31

Phase Transitions

23.1K
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
23.1K
Properties of Transition Metals02:58

Properties of Transition Metals

29.7K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
29.7K
Conjugate Addition (1,4-Addition) vs Direct Addition (1,2-Addition)01:27

Conjugate Addition (1,4-Addition) vs Direct Addition (1,2-Addition)

4.3K
α,β-Unsaturated carbonyl compounds with two electrophilic sites, the carbonyl carbon, and the β carbon, are susceptible to nucleophilic attack via two modes: conjugate or 1,4-addition and direct or 1,2-addition.
Conjugate addition results in a thermodynamically stable product. The reaction retains the stronger C=O bond at the expense of the weaker C=C π bond. The process is slow as the β carbon is less electrophilic than the carbonyl carbon.
Direct addition products are...
4.3K
Phase Transitions: Vaporization and Condensation02:39

Phase Transitions: Vaporization and Condensation

21.0K
The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
21.0K
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

8.7K
Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
8.7K

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相关实验视频

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Additive Manufacturing of Functionally Graded Ceramic Materials by Stereolithography
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混合材料中的过渡行为 大格式增材制造 增材制造

James Brackett1, Elijah Charles2, Matthew Charles2

  • 1The Bredesen Center for Interdisciplinary Research, University of Tennessee, Knoxville, TN 37996, USA.

Polymers
|January 28, 2026
PubMed
概括

大格式增材制造 (LFAM) 现在可以在大面积增材制造 (BAAM) 平台上使用新的双系统创建分级材料过渡. 这一进步通过改善材料界限和减少分层失败来增强复合3D打印.

关键词:
添加剂制造 添加剂制造 添加剂制造大型格式的大型格式.多种材料的多种材料.热塑复合材料是一种热塑复合材料.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 制造业 工程 制造工程
  • 添加剂制造 添加剂制造 添加剂制造

背景情况:

  • 大格式增材制造 (LFAM) 能够使用颗粒化原料进行多米尺度的复合材料3D打印.
  • 在LFAM中现有的多材料 (MM) 技术往往导致材料边界较弱和分层.
  • 大面积增材制造 (BAAM) 系统是工业应用的关键LFAM平台.

研究的目的:

  • 开发和研究BAAM系统的新型双配置,以便在现场切换材料原料.
  • 研究挤出参数和材料特性对不同原料之间的过渡行为的影响.
  • 在3D打印零件中创建分级过渡区域,减轻传统MM-LFAM中发现的弱点.

主要方法:

  • 在BAAM平台中集成了一种双跳槽配置,以实现无的材料切换.
  • 使用与挤出体积相关联的组成分析分析了材料过渡.
  • 过渡行为是使用韦布尔累积分布函数 (CDF) 建模的.
  • 研究的因素包括挤出螺丝的速度,组件设计,过渡方向和材料粘度.

主要成果:

  • 挤出螺丝的速度对过渡行为产生了微不足道的影响.
  • 旨在改善材料混合的组件设计导致了更大的混合材料区域.
  • 复杂粘度的相对差异和变化显著影响了混合过渡区域的大小.
  • 使用韦布尔CDF成功建模了材料过渡.

结论:

  • 这种新的双系统有效地在LFAM中创建了分级的材料过渡.
  • 通过优化复合材料原料选择和修改复杂粘度,可以实现材料转换和可调节性质.
  • 这种方法为克服多材料LFAM中的分层问题提供了一条途径,增强结构完整性.