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Bioinspired Inorganic/polymer Thin Films

Published online by Cambridge University Press:  31 January 2011

Gustavo A. Hirata
Affiliation:
hirata@cnyn.unam.mx, CNYN-UNAM, Fisicoquimica de Nanomateriales, Km. 107 Carretera Tij-Ens, Ensenada, BAJA CALIFORNIA, 22860, Mexico, +52-646-174-4604, +52-646-174-4603
Sandra Payan Diaz
Affiliation:
spayan@cnyn.unam.mx, CNYN-UNAM, Fisicoquimica de Nanomateriales, Ensenada, Mexico
Po-Yu Chen
Affiliation:
pochen@ucsd.edu, University of California, San Diego, Materials Science and Engineering Program, La Jolla, California, United States
Marc A. Meyers
Affiliation:
mameyers@ucsd.edu, University of California, San Diego, Mechanical and Aerospace Engineering, La Jolla, California, United States
Joanna McKittrick
Affiliation:
jmckittrick@ucsd.edu, University of California, San Diego, Mechanical and Aerospace, 9500 Gilman Dr., La Jolla, California, 92093-0411, United States
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Abstract

Studies of hard biological materials such as marine shells, animal teeth, horns and bones have produced fascinating ideas for mimicking their micro/nanostructure in the lab. The nacre in the abalone shell has a well-defined organic/inorganic structure that has a fracture resistance that is much higher than the individual constituents. By using biocompatible materials we have fabricated zirconium nitride/ polymethylmethacrylate alternating layers that are based on the structure of nacre. A combination of DC-magnetron sputtering and pulsed laser deposition on (100) silicon substrates was used to fabricate multilayers in a single chamber without breaking the vacuum. The ZrN films showed nanocrystalline columnar growth on the silicon substrates or on the PMMA nanolayer. High resolution SEM analysis at the inorganic/organic interface revealed well formed, uniform thickness inorganic films which are separated by the polymeric layer (30-90 nm). The ratio of the ceramic/polymer is the same as in nacre. Nanoindentation hardness values of ˜ 20GPa were measured on both the ZrN single film, similar to published values, and the ZrN/PMMA composite layers and the elastic modulus remained constant, independent of the number of layers.

Type
Research Article
Copyright
Copyright © Materials Research Society 2010

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