Polymer‐Induced Alignment of dl‐Alanine Nanocrystals to Crystalline Mesostructures
- 1 January 2005
- journal article
- research article
- Published by Wiley in Chemistry – A European Journal
- Vol. 11 (10), 2903-2913
- https://doi.org/10.1002/chem.200400420
Abstract
Crystallization of dl-alanine by cooling of a supersaturated solution in the presence of a chiral double-hydrophilic block copolymer poly(ethylene glycol)-block-poly(ethylene imine)-S-isobutyric acid (PEG4700-PEI1200-S-iBAc) yields crystal superstructures with an astonishing morphology. Although analysis by light microscopy reveals these crystals to be apparently well facetted, electron microscopy shows that they consist of three-dimensionally, well-aligned nanocrystals that are scaffolded to a so-called mesocrystal. This mesocrystal is formed by polymer-mediated structuration, and provides evidence for the importance of mesoscopic events in a typical crystallization process.Keywords
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