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相关概念视频

Superplasticizers01:30

Superplasticizers

272
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,...
272

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相关实验视频

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Functionalization of Single-walled Carbon Nanotubes with Thermo-reversible Block Copolymers and Characterization by Small-angle Neutron Scattering
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超塑性碳纳米管是一种超塑性碳纳米管

J Y Huang1, S Chen, Z Q Wang

  • 1Department of Physics, Boston College, Boston, Massachusetts 02467, USA. huangje@bc.edu

Nature
|January 20, 2006
PubMed
概括
此摘要是机器生成的。

单个单壁碳纳米管在高温下表现出超塑性变形,在破裂之前显著延长. 这一发现可以提高陶和纳米复合材料等先进材料的性能.

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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
  • 机械工程 机械工程

背景情况:

  • 单壁碳纳米管 (SWCNTs) 具有约20%的理论最大拉伸力,但实际应用受到较低的实现延长 (约6%) 的限制.
  • 了解SWCNT的变形机制对于它们融入先进材料至关重要.

研究的目的:

  • 在高温下研究单个SWCNT的变形行为.
  • 探索利用SWCNTs的材料中增强机械性能的潜力.

主要方法:

  • 单个单壁碳纳米管的高温拉伸试验.
  • 微观分析以观察变形机制.

主要成果:

  • 单个SWCNT在高温下表现出超塑性变形,达到高达280%的延长.
  • 在超塑性变形过程中,SWCNTs变得约为15倍窄.
  • 观察到的超塑性归因于纳米管内结构的核和运动.

结论:

  • 高温使SWCNT的超塑性变形成为可能,显著超过之前观察到的极限.
  • 涉及扭曲的超塑性机制提供了一条改善陶和纳米复合材料强度和性的途径.
  • 这一发现对对高性能材料的开发产生了重大影响,这些材料适用于苛刻的应用.