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Materials 2013, 6(1), 206-216; doi:10.3390/ma6010206
Article

Comparative Study of Loading of Anodic Porous Alumina with Silver Nanoparticles Using Different Methods

1,2
, 1
, 3
, 3
 and 1,*
1 Department of Nanophysics, Istituto Italiano di Tecnologia, via Morego 30, Genova I-16163, Italy 2 University of Genova, viale Causa 13, Genova I-16145, Italy 3 Department of Nanochemistry, Istituto Italiano di Tecnologia, via Morego 30, Genova I-16163, Italy
* Author to whom correspondence should be addressed.
Received: 24 October 2012 / Revised: 6 December 2012 / Accepted: 6 January 2013 / Published: 14 January 2013
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Abstract

Three different routes were used to infiltrate the pores of anodic porous alumina templates with silver nanoparticles, selected as an example of a bioactive agent. The three methods present a continuous grading from more physical to more chemical character, starting from ex situ filling of the pores with pre-existing particles, moving on to in situ formation of particles in the pores by bare calcination and ending with in situ calcination following specific chemical reactions. The resulting presence of silver inside the pores was assessed by means of energy dispersive X-ray spectroscopy and X-ray diffraction. The number and the size of nanoparticles were evaluated by scanning electron microscopy of functionalized alumina cross-sections, followed by image analysis. It appears that the best functionalization results are obtained with the in situ chemical procedure, based on the prior formation of silver ion complex by means of ammonia, followed by reduction with an excess amount of acetaldehyde. Elution of the silver content from the chemically functionalized alumina into phosphate buffer saline has also been examined, demonstrating a sustained release of silver over time, up to 15 h.
Keywords: anodic porous alumina; nanoparticles; silver; filling factor; elution anodic porous alumina; nanoparticles; silver; filling factor; elution
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.

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MDPI and ACS Style

Thorat, S.; Diaspro, A.; Scarpellini, A.; Povia, M.; Salerno, M. Comparative Study of Loading of Anodic Porous Alumina with Silver Nanoparticles Using Different Methods. Materials 2013, 6, 206-216.

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