Research was carried out at the Center for Functional Nanomaterials, Brookhaven National Laboratory, which is supported by the U.S. Department of Energy, Office of Basic Energy Sciences (Contract No. DE-AC02-98CH10886). Use of the National Synchrotron Light Source, Brookhaven National Laboratory, was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-98CH10886. RKP acknowledges financial support from the International Iberian Nanotechnology Laboratory (INL) in Braga, Portugal. Supporting Information is available from the Wiley Online Library or from the author.
Biomimetic Pathways for Nanostructured Poly(KAMPS)/aragonite Composites that Mimic Seashell Nacre†
Version of Record online: 23 MAY 2011
Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Advanced Engineering Materials
Volume 13, Issue 10, pages B415–B422, October, 2011
How to Cite
Pai, R. K., Zhang, L., Nykpanchuk, D., Cotlet, M. and Korach, C. S. (2011), Biomimetic Pathways for Nanostructured Poly(KAMPS)/aragonite Composites that Mimic Seashell Nacre. Adv. Eng. Mater., 13: B415–B422. doi: 10.1002/adem.201080136
- Issue online: 10 OCT 2011
- Version of Record online: 23 MAY 2011
- Manuscript Accepted: 12 MAR 2011
- Manuscript Received: 12 NOV 2010
Complex microstructures of biominerals such as seashell nacre, bone, and teeth are awe-inspiring. Nature has devised schemes to combine hard inorganic platelets of aragonite (CaCO3) and an organic matrix that produce tough biocomposites. The ability of the organic-inorganic components to “slide” internally leads to the toughening of the materials, though a recreation of this system at the nanoscale has yet to be shown. Here, we implement a poly(KAMPS)-based assembly, which is carried out entirely from dilute aqueous solutions of the materials to create a “brick and mortar”-type aragonite structure that mimics the platelet sliding and exhibits toughening. The negatively charged poly(KAMPS) chains are attracted to the positively charged divalent cations, by which addition of NaHCO3 to an aqueous mixture of Ca2+-poly(KAMPS), results in the growth of aragonite nanorods with a width of 120 nm. The reversible nature of the physical gel formation of poly(KAMPS) in solution results in adhesion of the nanorods into a microscale structure. The new nacre-like carbonate composite, has a modulus (44 GPa) and hardness (2.8 GPa) on a similar order as to that of nacre and other bio-composites, exhibits limited creep, and demonstrates a mechanism with nanoscale deformation.