Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2010 - zeszyt 3

Study of the properties of Al2O3-Ag nanopowders produced by thermal decomposition-reduction method and colloidal nanosilver impregnation

nr katalogowy: 52725

There is a great need for antimicrobial materials across many industries and disciplines. That is why silver nanoparticles have been the centre of great interest in recent years. Owing to their small size, silver nanoparticles present good chemical activity, which is size and shape dependent [1]. They also possess good antirheumatic and antiphlogistic properties. As well as silver cations, silver nanoparticles affect wide range Gram-positive, Gram-negative bacteria and fungi [2]. Furthermore, it is unlikely that microorganisms will acquire resistance toward silver nanoparticles, compared to other biocides like antibiotics [3]. As a result, the potential for nanosilver-doped materials is limitless. Silver nanoparticles have been investigated as an addition to various types of matrices, due to their antimicrobial properties. Currently most important applications in the medical field include: wound dressings [4], medical implant coatings [5], ultrafiltration membranes and antifouling materials [6]. Although such “free" nanoparticles are not suitable in most applications (e.g. wound dressings) because they can be subsequently removed from the material while using it. In case of those materials, it is crucial to incorporate silver nanoparticles permanently. However, this problem can be solved by using a support. Among all inert supports, alumina is the most promising one. For silver nanoparticles incorporation, only alumina porous sinters [7], spheres [8] or needles [4] have been applied. Owing to alumina nanoparticles small size, which is no greater than 100 nm, they present large surface area. They are also characterized as the most inert ceramic for human organism, which have a good biocompatibility [5]. Due to these properties, alumina nanoparticles can be used as a support for silver nanoparticles. OBTAINING ALUMINA -SIL VER NANO PARTICLES For the synthesis of nanosilver particles (20 nm) supported on the alumina nanop[...]

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