The result is natural silks that can stretch and bend while retaining a high degree ofstrength. But while thats all well and good for spiders, bees and the like, this understanding ofsilk geometry could lead to new materials that are stronger and more ductile than those we cancurrently manufacture. Our best and strongest materials are generally expensive and difficult toproduce (requiring high temperature treatments or energy-intensive processes).
By looking to silk as a model, researchers could potentially devise new manufacturingmethods that rely on inexpensive materials and weak bonds to create less rigid, more forgivingmaterials that are nonetheless stronger than anything currently on offer. And if you thought youwere going to get out of this materials science story without heating about carbon nanotubes,think again. The MIT team is already in the lab looking into ways of synthesizing silk-likestructures out of materials that are stronger than natural silk -- like carbcn nanotubes. Super-silks are on the horizon.
MIT researchers carry out the study to illustrate an ancient Chinese proverb.
A.Right
B.Wrong
C.Not mentioned
17、 Silks strength comes from its weak hydrogen bonds working together.
A.Right
B.Wrong
C.Not mentioned
18、 Biologist and engineer are interested in understanding natural silks because they are very light and brittle.
【2013年职称英语考试《理工类A级》考试真题】相关文章:
最新
2016-03-02
2016-03-02
2016-03-02
2016-03-02
2016-03-02
2016-03-02