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Trendy w badaniach kontrolowanej reakcji hydrolizy związków glinoorganicznych

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Dokonano przeglądu literatury na temat kontrolowanej reakcji hydrolizy związków glinoorganicznych, prowadzącej do trwałych kompleksów hydroksyglinowych, a w tym pochodnych hydroksyglinowych stabilizowanych rozbudowanym przestrzennie ligandem b-diketiminowym. Pokazano możliwość wykorzystania tych kompleksów jako prekursorów alumoksanów oraz układów bimetalicznych Al-O-M. A review of reacti[...]

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

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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[...]

Producing and properties of the polylactide-alumina nanocomposite fibres

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Electro-spinning is a very promising and very interesting process of fibre production. This technique allows us to produce fibres of a diameter ranging from few na nometers to 1 mm [1÷5]. Experiments have showed that almost every polymer can be made into fibres by electro-spinning. Electro-spun fibre can be applied in an aerosol filtration but it can also be used as a drug carrier or bandage. First publications about electro-spinning for fibre production were published by Petrianov [6]. Other current applications include medical applications of electro-spun fibres as wound dressings. A portable device for fibres electro-spinning can be applied directly on the wound and produce a permeable wound dressing, applicable especially in the case of vast burns [7]. Electro-spun fibres, even if they are very fine, can be easily collected, if compared to other methods. The method for electro-spinning fibres collection is showed in Figure 1. Polylactide (PLA) is polyester produced in the lactide ring-opening polymerization process. Polylactide is the most important plastic material that can be derived from renewable resources. It also has an omnipresent status in the biomedical field, because of ability to decompose over a period of time [8]. In case of materials that can be decomposed in human organism, it is crucial to use filler, which will serve as a scaffold for human tissue after polylactide decomposition. Among all inert inorganic fill[...]

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