Wyniki 1-1 spośród 1 dla zapytania: authorDesc:"Wojciech Swieszkowski"

Frustules of Didymosphenia geminata as a modifier of resins DOI:10.15199/28.2018.5.2

  1. INTRODUCTION Didymosphenia geminata (Lyngbye), is a freshwater diatom, which produces siliceous shell and mucilage material in the form of stalks, which attach it to substrates in water, such as stones, plant or debris. This species received increasing interest in recent years, due to its geographical expansion [1÷3]. In the last decade, the massive occurrence of D. geminata has been reported in Europe, Asia [4] and other locations like New Zealand [4], the United States of America [5], Canada [6], Chile and Argentina [7]. Among the diatom species, with the length of 80÷140 μm [8] and width of 35÷45 μm [8], D. geminata is classified as large. The structure and chemical composition of the diatom D. geminata stalks have been recently a subject of extensive investigations, the results of which are given in Ehrlich et al. [9]. These investigations were driven by the idea of using the stalks as biomaterial. The aim of the present study was to set the stage for engineering applications of the D. geminata shells, called frustule, by exploring their properties as a filler of polymeric resins. Due to large variations in morphology, and hierarchical architecture (Fig. 1) the diatoms have been used in advanced materials applications, i.e.: in filtration [10, 11], absorption/insulation, fabrication of photonic crystals [12÷14], and drug delivery [15]. Also, it should be noted that the diatoms can be farmed on an industrial scale [16, 17], thus opening the space for the use in mass-production. In analysing potential advantages of using diatom frustule for modification of polymer composites [18, 19] and production “green" eco-polymers [19, 20], it should be noted that biological materials achieve mechanical properties, which are far beyond those man-made materials [21]. On the other hand, because of their unique micro- and nanostructural features, testing of the mechanical properties of the frustule is a challenging exerci[...]

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