Characterisation of Silica in Equisetum hyemale and its Transformation into Biomorphous Ceramics

Sapei, Lanny (2007) Characterisation of Silica in Equisetum hyemale and its Transformation into Biomorphous Ceramics. ["eprint_fieldopt_thesis_type_phd" not defined] thesis, Universität Potsdam.

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Equisetum spp. (horsetail / “Schachtelhalm”) is the only surviving genus of the primitive Sphenopsids vascular plants which reached their zenith during the Carboniferous era. It is an herbaceous plant and is distinguished by jointed stems with fused whorl of nodal leaves. The plant has been used for scouring kitchen utensils and polishing wood during the past time due to its high silica encrustations in the epidermis. Equisetum hyemale (scouring rush) can accumulate silica up to 16% dry weight in its tissue, which makes this plant an interesting candidate as a renewable resource of silica for the synthesis of biomorphous ceramics. The thesis comprises a comprehensive experimental study of silica accumulations in E.hyemale using different characterisation techniques at all hierarchical levels. The obtained results shed light on the local distribution, chemical form, crystallinity, and nanostructure of biogenic silica in E.hyemale which were quite unclear until now. Furthermore, isolation of biogenic silica from E.hyemale to obtain high

Item Type: Thesis (["eprint_fieldopt_thesis_type_phd" not defined])
Uncontrolled Keywords: Mikrotomographie; Raman; Röntgenbeugung; Siliciumdioxid; Winterschachtelhalm Equisetum hyemale; Raman; SAXS; microtomography; silica
Subjects: T Technology > TP Chemical technology
Divisions: Faculty of Engineering > Department of Chemical Engineering
Date Deposited: 09 Jan 2020 08:13
Last Modified: 09 Jan 2020 08:13

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