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相关概念视频

Pore Size Distribution01:23

Pore Size Distribution

117
In concrete, the pore size distribution significantly influences the material's properties. Capillary pores, markedly larger than gel pores, form a vast network within partially hydrated cement paste, reducing the concrete's strength and increasing its permeability. This heightened permeability leads to a greater risk of damage from environmental factors like freeze-thaw cycles and chemical attacks, with the extent of vulnerability also being tied to the water-to-cement ratio.
Adequate...
117
Porosity in Cement Paste01:18

Porosity in Cement Paste

125
The porosity of concrete is a measure of the void spaces within its structure. These spaces impact its strength and durability significantly. When water and cement interact, a chemical reaction called hydration creates a semi-solid paste. This paste includes combined water, making up approximately 23% of the cement's dry mass, and gel water, which fills minuscule voids known as gel pores, accounting for about 28% of the cement gel volume.
The balance of water to cement in the mix is...
125

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相关实验视频

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Dynamic Pore-scale Reservoir-condition Imaging of Reaction in Carbonates Using Synchrotron Fast Tomography
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钻石具有意想不到的多尺度孔径.

Shuaiqi Li1, Ruiang Guo2, Qian Li2

  • 1College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing, 400000, China.

Small (Weinheim an der Bergstrasse, Germany)
|June 19, 2024
PubMed
概括

使用可溶性骨架 (HPHT-ss) 的新型高温高压方法有效合成毫米级的多孔钻石. 这种材料为先进的应用提供了高表面积/体积比.

关键词:
高压和高温的高压和高温.半镜孔 半镜孔 半镜孔 半镜孔有孔的钻石钻石.有孔的材料是多孔的材料.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 纳米技术 纳米技术
  • 化学工程是化学工程的重要组成部分.

背景情况:

  • 钻石产品包括各种形式,如纳米多晶钻石 (NPD) 和微米多晶钻石 (MPD).
  • 多孔钻石因其高表面积/体积比 (SA/V) 和表面功能而脱而出.
  • 现有的合成方法,如蚀刻或微波等离子体化学蒸气沉积 (MPCVD) 有局限性.

研究的目的:

  • 开发一种高效,廉价的合成毫米级多孔钻石的方法.
  • 探索蚀或MPCVD技术的替代方案,以生产多孔钻石.
  • 为了描述合成的多孔钻石的多尺度孔隙结构.

主要方法:

  • 基于可溶性骨架 (HPHT-ss) 的高温高压方法的建议.
  • 使用开发的HPHT-ss技术合成毫米级的多孔钻石.
  • 分析温度-压力条件和多孔钻石的形成机制.

主要成果:

  • 通过HPHT-ss方法成功合成了毫米级的多孔钻石.
  • 合成的多孔钻石表现出多尺度的毛孔:巨孔 (平均75微米) 和中孔 (平均19纳米).
  • 这种多尺度孔隙分布是与其他方法生产的多孔钻石相比的独特特征.

结论:

  • 该HPHT-ss方法提供了一种高效和成本效益的途径,用于多孔钻石合成.
  • 通过HPHT-ss合成的多孔钻石具有独特的多尺度孔隙结构.
  • 由于这种材料的特性,它有可能在催化,吸附和电化学领域应用.