Abstract
Control over the morphology of calcium carbonate (CaCO 3) crystals has been achieved through the use of anionic, amphiphilic block copolypeptides during crystallization. Microspheres of CaCO 3 can be synthesized by the introduction of preformed organic, amphiphilic block copolypeptide templates, poly( l-aspartate sodium salt) 100- block-[poly( l-phenylalanine) 25- random-( l-leucine) 25] ( 1) and poly( l-glutamate sodium salt) 100- block-[poly( l-phenylalanine) 25- random-( l-leucine) 25] ( 2). When cationic amphiphiles are used in lieu of the anionic amphiphiles, only CaCO 3 rhombohedra are produced. The self-assembling amphiphile controls the precipitation of the microspheres by acting as a template to form giant CaCO 3 microspheres. These microspheres are composed of nanocrystals ranging in size from 10 to 60 nm using 1 and 20 to 100 nm using 2.
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