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相关概念视频

Fiber Reinforced Concrete01:22

Fiber Reinforced Concrete

Fiber-reinforced concrete significantly enhances the structural and nonstructural properties of traditional concrete by incorporating fibers like steel, glass, and polymers. These fibers, varying from natural ones such as sisal and cellulose to manufactured ones like polypropylene and Kevlar, are mixed into hydraulic cement with aggregates. Steel fibers, often preferred for their robustness, contribute to improved ductility, toughness, and post-cracking performance. The concrete is classified...
Superplasticizers01:30

Superplasticizers

Superplasticizers are advanced admixtures that enhance the workability of concrete by lowering the water content without compromising the strength of the material. These substances are highly effective water reducers, improving concrete flow, making it easier to work with, and enabling concrete to reach inaccessible areas or densely reinforced sections without mechanical vibration. The key components in superplasticizers are either sulfonated melamine or naphthalene formaldehyde condensates,...
Additives and Fillers in Concrete01:29

Additives and Fillers in Concrete

Additives and fillers are integral to enhancing the properties of concrete. Pozzolans and blast-furnace slag are additives or admixtures due to their reactions with calcium hydroxide released during cement hydration. Fillers, which are finely ground and similar in fineness to Portland cement, improve concrete attributes such as workability density, and reduce capillary bleeding or cracking. Some fillers possess hydraulic properties or participate in benign reactions within the cement paste.
The...
Alkali Aggregate Reaction in Concrete01:26

Alkali Aggregate Reaction in Concrete

The alkali-aggregate reaction in concrete involves natural siliceous minerals in aggregates reacting with alkaline hydroxides derived from cement alkalis. This reaction forms an alkali-silica gel that absorbs water, swells, and increases in volume, which is confined by the surrounding cement paste, creating internal pressures that crack and disrupt the concrete. The extent of expansion and damage can be partly attributed to the alkali-silica reaction's osmotic hydraulic pressure and the...

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Preparation and Reactivity of Gasless Nanostructured Energetic Materials
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结构工程的半孔AlSi/P(VDF-HFP) 能量复合材料具有扩散增强的反应性.

Xinwen Ma1, Ke-Juan Meng1, Wenhao Wang2

  • 1Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, China.

Small (Weinheim an der Bergstrasse, Germany)
|December 24, 2025
PubMed
概括

这项研究为高能复合材料设计了半孔-合金燃料,通过克服扩散极限,显著增加了能量释放. 新的设计增强了先进的能量材料的燃烧性能和加压能力.

关键词:
基于Al的合金燃料是基于Al的合金燃料.它具有能量特性,具有能量特性.增强的扩散扩散增强的扩散.这是一种中孔结构,具有中孔结构.表面化表面化

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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.
  • 能量材料 能量材料

背景情况:

  • 基于 (Al) 的合金是能量复合材料 (EC) 的关键固体燃料.
  • 它们的能量释放效率通常受到缓慢扩散控制反应动力学的限制.
  • 改善反应动力学对于提高EC性能至关重要.

研究的目的:

  • 设计和合成一种新型功能化的半孔AlSi合金燃料.
  • 形成具有增强反应性的AlSi/P(VDF-HFP) 能量复合物.
  • 为了研究结构-属性关系,管理改善的燃烧.

主要方法:

  • 序列蚀刻和化策略用于制造AlSi合金.
  • 形成AlSi/P(VDF-HFP) 能量复合材料的过程.
  • 用于表面分析的X射线光电子光谱 (XPS).
  • 分子动力学 (MD) 模拟用于相互作用分析.
  • 用于性能评估的点火和封闭式炸弹测试.

主要成果:

  • 半孔AlSi合金有效地克服了ECs中的扩散限制.
  • 半孔Si框架催化P ((VDF-HFP) 分解,并促进气体运输.
  • 化表面增强与P(VDF-HFP的结合,增加反应热量.
  • 减少了激活能量,显著改善了燃烧性能和加压.

结论:

  • 结构工程的半孔AlSi合金燃料提供了一个可行的途径来提高EC反应性.
  • 中等性和表面化的协同效应是提高性能的关键.
  • 这种方法为开发高性能能量材料提供了一种可访问的方法.