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Journal Article

Magic angle (54.7°) gradient and minimal surfaces in quadruple micellar helices

MPS-Authors

Boettcher,  Christoph
Fritz Haber Institute, Max Planck Society;
Institut fur Organische Chemie der Freien Universitat Berlin;

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Winkler,  Hanspeter
Fritz Haber Institute, Max Planck Society;

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Zeitler,  Elmar
Fritz Haber Institute, Max Planck Society;

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Citation

Köning, J., Boettcher, C., Winkler, H., Zeitler, E., Talmon, Y., & Fuhrhop, J.-H. (1993). Magic angle (54.7°) gradient and minimal surfaces in quadruple micellar helices. Journal of the American Chemical Society, 115(2), 693-700. doi:10.1021/ja00055a045.


Cite as: https://hdl.handle.net/21.11116/0000-000A-CF69-8
Abstract
The first self-organized quadruple helices consisting of nonpolymeric material have been obtained from N-octyl-and N-dodecyl-ᴅ-gluconamides in water. They have been characterized by electron microscopy, image analysis, and computer modelling. The pitch of the helices is equal to (2π x molecular bilayer diameter); their gradient conforms with the magic angle (54.7°). The quadruple helices rearrange in aqueous gels to a single helix made of circular 4-fold layers of molecules, a pitch of 7.4 nm, and a gradient of 82 ± 3°. This quadruple layer may already contain head-to-tail oriented molecules, which are exclusively found in the final crystal sheets. The process of crystallization, from highly curved micellar fibers to planar crystal sheets, proceeds on minimal sufaces.