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[交流] 新开发纯碳材料具极佳防震特性 已有1人参与

新开发纯碳材料具极佳防震特性



日本研究者新近开发出一种纯碳材料,这种材料具有极佳防震特性,不仅有延展能力,可自行恢复原状,而且耐寒耐热,有望应用于航空工业及汽车制造业。

日本产业技术综合研究所材料科学家许明(音译)12月2日告诉路透社记者,这种新型材料有如浓稠的蜂蜜,可伸展,可自行复原。

“它就像是一种有孔的金属海绵,它由数以万亿计直径为5纳米的碳管组成,当你拉伸它然后松手,它会自己慢慢恢复原状,”徐明说。

定于3日出版的《科学》杂志说,由于这种材料具有良好延展性,因此具有极佳防震性能。同时,在有氧环境中,它可以耐受的温度范围为零下196摄氏度至1000摄氏度。

“这是一种全新和独特的材料。它可以用于太空领域,用于制造太空飞船或火箭的燃料箱,也可以用于制造汽车引擎,用以避震,”徐明说,“现阶段,还没有其他材料能够具备相同特性。”

他说,新材料的延展特性有些像橡胶,但它又具有良好的导电性,因此应用范围比橡胶更广泛。(来源:新华社)

Carbon Nanotubes with Temperature-Invariant Viscoelasticity from –196° to 1000°C
Ming Xu1, Don N. Futaba1,*, Takeo Yamada1, Motoo Yumura1 and Kenji Hata1,2,*
+ Author Affiliations

1Technology Research Association for Single Wall Carbon Nanotubes (TASC) and Nanotube Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, 305-8565, Japan.
2Japan Science and Technology Agency (JST), Kawaguchi, 332-0012, Japan.
*To whom correspondence should be addressed. E-mail: kenji-hata@aist.go.jp (K.H.); d-futaba@aist.go.jp (D.N.F.)
Abstract
Viscoelasticity describes the ability of a material to possess both elasticity and viscosity. Viscoelastic materials, such as rubbers, possess a limited operational temperature range (for example, for silicone rubber it is –55° to 300°C), above which the material breaks down and below which the material undergoes a glass transition and hardens. We created a viscoelastic material composed from a random network of long interconnected carbon nanotubes that exhibited an operational temperature range from –196° to 1000°C. The storage and loss moduli, frequency stability, reversible deformation level, and fatigue resistance were invariant from –140° to 600°C. We interpret that the thermal stability stems from energy dissipation through the zipping and unzipping of carbon nanotubes at contacts.

http://www.sciencemag.org/content/330/6009/1364

[ Last edited by csuhcb2000 on 2010-12-7 at 21:18 ]
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