Abstract
Diatoms are unicellular algae that belonging to the class Bacillariophyceae. They inhabit nearly all aquaticenvironments from marine to freshwater and moist habitats. These organisms create highly ornamented externalsiliceous shells of multi-layer structure with multi-scale porosity. The main objective of this study is to explore theutilization of diatom-derived porous structures in nanotechnology. The present study is based on five dominant speciesidentified and described from 59 samples collected from different habitats in Egypt. The studied taxa includedActinocyclus cf. octonarius Ehrenberg, Aulacoseira granulata (Ehrenberg) Simonsen, Cyclotella meneghinianaKutzing and Pleurosira laevis (Ehrenberg) Compere. Nanoporous structures of the considered taxa have been wellinvestigated through SEM analysis. The sizes of nanoporous silica were found in the range of 5 to 500 nm. Theobtained results showed the potential of diatoms as a source of natural silica micro-particles with micro- to nano-porousstructures with prospective applications as supports for catalysis, selective adsorption, sensors, membranes, and othernovel nanotechnological applications.
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