Helical Nanofilament Phases
| Autor: | Darren R. Link, Jürgen P. Rabe, David M. Walba, Matthew A. Glaser, Gerd Heppke, Michi Nakata, Daniel Krüerke, Eva Korblova, Dong Chen, Noel A. Clark, Joseph A. Zasadzinski, Hannes Jung, Wolfgang Stocker, Michael-Scott Heberling, Loren E. Hough, Christopher D. Jones |
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| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | Science. 325:456-460 |
| ISSN: | 1095-9203 0036-8075 |
| Popis: | Assembling achiral molecules typically generates achiral domains. However, odd things can happen when the molecules are banana-or boomerang-shaped—their cores can twist out of plain to form left- or right-handed helices, which can then pack into chiral domains that will polarize light (see the Perspective by Amabilino ). Hough et al. (p. [452][1]) show that if you make the situation even more complex by frustrating the packing of adjacent layers, you can create a material that appears to be macroscopically isotropic with only very local positional and orientational ordering of the molecules but still shows an overall chirality. In a second paper, Hough et al. (p. [456][2]) also show that if you change the chemistry of the molecules to allow for better overall packing, you can create a situation where helical filaments form that also tend to pack in layered structures. However, the frustration between the two types of packing leads to macroscopically chiral and mesoporous structures. [1]: /lookup/volpage/325/452 [2]: /lookup/volpage/325/456 |
| Databáze: | OpenAIRE |
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