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- W2150510497 abstract "Epitaxial crystallization of poly-γ-benzyl-L-glutamate (PBLG) on 001 alkali halide single crystal surfaces results in block and row structures that are qualitatively similar for various solvents and crystals used. There is a definite tendency in the first stages of epitaxial crystallization to align the α-helical molecules along the 〈110〉 substrate direction. We propose that the epitaxial structures are built up of straight, non-folded α-helical molecules associated side-by-side and, in the case of low Mw fractions, also end-to-end. The epitaxial crystallization of PBLG was observed only in the vicinity of the precipitation point. The orienting and attracting forces coming from the crystal substrate have a long range character and are of at least two kinds. The decoration effect of PBLG epitaxial structures could be used for substrate surface structure characterization.Die Epitaxie von Poly-α-benzyl-L-glutamat (PBLG) auf der (001)-Spaltflache von Alkalihalogenideinkristallen fuhrt zum Aufwachsen von Block- und Linienstrukturen, welche fur verschiedene Losungsmittel und Tragermaterialien qualitativ ahnlich sind. Im Anfangsstadium der epitaktischen Kristallisation wurde eine eindeutige Tendenz zur Orientierung der α-Helices von PBLG entlang der 〈110〉-Richtung des Tragers beobachtet. Es wird angenommen, das die epitaktischen Strukturen aus gestreckten, nicht gefalteten Molekulen (α-Helices) gebildet sind, die normalerweise nebeneinander, im Fall von niedermolekularen Fraktionen aber auch linear assoziiert sind. Epitaxie von PBLG wurde nur in der Nahe des Fallungspunktes beobachtet. Die vom Kristall ausgehenden Anziehungs-und Orientierungskrafte sind ziemlich weitreichend, und es gibt mindestens zwei Arten davon. Man kann den Dekorationseffekt der PBLG-Epitaxie zur Charakterisierung der Trageroberflache ausnutzen." @default.
- W2150510497 created "2016-06-24" @default.
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- W2150510497 date "1972-08-01" @default.
- W2150510497 modified "2023-09-24" @default.
- W2150510497 doi "https://doi.org/10.1002/macp.1972.021580105" @default.
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