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相关概念视频

Porosity and Absorption of Aggregate01:20

Porosity and Absorption of Aggregate

996
Aggregates contain pores of varying sizes; while some are completely enclosed within the particles, others open onto the surface, allowing water to penetrate. The porosity of aggregates is a major factor contributing to the overall porosity of concrete, given that aggregates constitute about three-quarters of concrete's volume.
When all pores in an aggregate are filled with water, the aggregate is considered saturated and surface-dry. If left in dry air, water will evaporate until the...
996
Porosity in Cement Paste01:18

Porosity in Cement Paste

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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...
581

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相关实验视频

Updated: Apr 14, 2026

Microbubble Fabrication of Concave-porosity PDMS Beads
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为新兴应用而订购的多孔材料.

Mark E Davis1

  • 1Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA. mdavis@cheme.caltech.edu

Nature
|June 21, 2002
PubMed
概括

科学家们正在推进创造具有有序结构的新型多孔材料. 这些工程材料具有独特的特性,将应用范围扩大到传统用途之外,进入微电子和医学诊断等领域.

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 化学 化学

背景情况:

  • 控制多孔材料的结构对于先进的应用至关重要.
  • 近几十年来,在制造有序多孔固体方面取得了重大进展.
  • 多孔材料正在超越作为催化剂和吸附剂的传统作用.

研究的目的:

  • 为了突出透材料制造方面的进步.
  • 探索这些材料不断扩大的应用.
  • 讨论对毛孔大小,形状和均性的控制.

主要方法:

  • 制造具有有序结构的新型多孔固体.
  • 材料特性和孔隙均性的表征.
  • 探索不同的材料组成.

主要成果:

  • 在制造有序的多孔固体方面取得了重大进展.
  • 开发具有不寻常和可调节性质的材料.
  • 扩大了多孔材料的应用范围.

结论:

  • 多孔材料为纳米级环境提供了前所未有的控制.

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  • 这些材料有望影响各种技术领域.
  • 未来的应用包括微电子和先进的医学诊断.