从宏性中制备层次性多孔
1Department of Materials Science and Engineering, University of California at Los Angeles, Los Angeles, California 90095, USA.
Journal of the American Chemical Society
|November 23, 2006
概括
研究人员开发了一种新方法,使用模板的水性处理来创建层次性的多孔结构. 这种技术可以产生高度多孔的金属材料,在催化和储能方面具有潜在的应用.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
- 电化学 电化学 电化学
背景情况:
- 层次性多孔材料在各种应用中提供了独特的优势,因为它们的微和宏多孔性结合在一起.
- 基于的材料对于催化和储能至关重要,但通常需要特定的结构控制才能达到最佳性能.
研究的目的:
- 开发一种新且高效的方法来合成层次性的多孔结构.
- 探索使用巨孔作为创建复杂金属架构的模板的潜力.
主要方法:
- 用酸 (HF) 溶液蚀刻的宏性模板的水性加工.
- 通过排位反应沉积,其中被取代.
- 控制的蚀刻,以创建直线的微通道和多孔的侧墙.
主要成果:
- 成功制造了层次性的多孔结构,具有相互连接的多孔性.
- 证明了沉积物在侧壁上表现出高孔径,这是由于移位过程中消耗造成的.
- 由此产生的金属结构具有微通道和侧墙多孔性,从而创建了一个层次结构.
结论:
- 开发的水性加工方法对于制造层次性的多孔是有效的.
- 巨孔作为一个可行的模板,用于模板复杂的多孔金属结构.
- 由此产生的层次性多孔结构对需要高表面积和可控多孔度的应用具有前景.
相关概念视频
01:20Porosity and Absorption of Aggregate
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 aggregate...
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 aggregate...
01:18Porosity in Cement Paste
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 critical—it...
The balance of water to cement in the mix is critical—it...