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Microscopic structure of the polymer-induced liquid precursor for calcium carbonate. | LitMetric

Microscopic structure of the polymer-induced liquid precursor for calcium carbonate.

Nat Commun

Department of Chemical Engineering and Chemistry, Laboratory of Materials and Interface Chemistry and Centre for Multiscale Electron Microscopy, Eindhoven University of Technology, PO Box 513, 5600 MB, Eindhoven, The Netherlands.

Published: July 2018

AI Article Synopsis

  • Many biomineral crystals develop complex shapes that aren't in equilibrium, often starting as temporary amorphous forms.
  • In the lab, crystals can also be engineered with these non-equilibrium shapes through the use of charged polymers that create a polymer-induced liquid precursor (PILP).
  • The study reveals that the polymer interacts with amorphous calcium carbonate nanoparticles early on but gets excluded during crystallization, suggesting that PILP involves the assembly of ACC clusters rather than liquid-liquid separation.

Article Abstract

Many biomineral crystals form complex non-equilibrium shapes, often via transient amorphous precursors. Also in vitro crystals can be grown with non-equilibrium morphologies, such as thin films or nanorods. In many cases this involves charged polymeric additives that form a polymer-induced liquid precursor (PILP). Here, we investigate the CaCO based PILP process with a variety of techniques including cryoTEM and NMR. The initial products are 30-50 nm amorphous calcium carbonate (ACC) nanoparticles with ~2 nm nanoparticulate texture. We show the polymers strongly interact with ACC in the early stages, and become excluded during crystallization, with no liquid-liquid phase separation detected during the process. Our results suggest that "PILP" is actually a polymer-driven assembly of ACC clusters, and that its liquid-like behavior at the macroscopic level is due to the small size and surface properties of the assemblies. We propose that a similar biopolymer-stabilized nanogranular phase may be active in biomineralization.

Download full-text PDF

Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6030133PMC
http://dx.doi.org/10.1038/s41467-018-05006-wDOI Listing

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