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Journal of Nanomaterials
Volume 2011 (2011), Article ID 760237, 10 pages
http://dx.doi.org/10.1155/2011/760237
Research Article

Controlled Release from Core-Shell Nanoporous Silica Particles for Corrosion Inhibition of Aluminum Alloys

1Department of Chemical and Nuclear Engineering and Center for Micro-Engineered Materials, University of New Mexico, Albuquerque, NM 87106, USA
2Aerosol and Respiratory Dosimetry Program, Lovelace Respiratory Research Institute, 2425 Ridgecrest Dr. SE, Albuquerque, NM 87108, USA
3Transmission Electron Microscopy Labs, The University of New Mexico, Albuquerque, NM 87131, USA
4SCB Innovation Accelerator, Dow Corning Corporation, 2200 W. Salzburg Road, P.O. Box 0994, Midland, MI 48686, USA
5Department of Geoscience, University of Wisconsin-Madison, Madison, WI 53706, USA
6Advanced Material Laboratory, Sandia National Laboratories, Albuquerque, NM 87185, USA

Received 3 November 2010; Accepted 2 December 2010

Academic Editor: Hugh D. Smyth

Copyright © 2011 Xingmao Jiang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Cerium (Ce) corrosion inhibitors were encapsulated into hexagonally ordered nanoporous silica particles via single-step aerosol-assisted self-assembly. The core/shell structured particles are effective for corrosion inhibition of aluminum alloy AA2024-T3. Numerical simulation proved that the core-shell nanostructure delays the release process. The effective diffusion coefficient elucidated from release data for monodisperse particles in water was 1.0×1014 m2s for Ce3+ compared to 2.5×1013 m2s for NaCl. The pore size, pore surface chemistry, and the inhibitor solubility are crucial factors for the application. Microporous hydrophobic particles encapsulating a less soluble corrosion inhibitor are desirable for long-term corrosion inhibition.