Facile hydrothermal fabrication of nano-oxides hollow spheres using monosaccharide as sacrificial templates

Mein Ziel in dieser Dissertation ist es eine einfache, umweltfreundliche, ökonomisch sinnvolle und additivfreie Syntheseroute für die Herstellung von oxidischen Hohlkörpern vorzustellen, welche letztendlich eine Optimierung der anorganischen Hohlmaterialien ermöglicht, die mittels einer einfachen h...

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Bibliographic Details
Main Author: Abdelaal, Haitham
Contributors: Harbrecht, Bernd (Prof. Dr.) (Thesis advisor)
Format: Doctoral Thesis
Published: Philipps-Universität Marburg 2013
Online Access:PDF Full Text
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My original goal in this dissertation to present a facile, environmental benign, economical sustainable and additive free synthesis protocol for the fabrication of hollow oxides which ultimately could enable the fine-tuning of the hollow inorganic materials has been achieved via facile one-pot hydrothermal strategy through using simple sugar (glucose and fructose) as sacrificial templates. This class of materials are of great importance from the scientific and the technological point of view due to their unique properties such as large specific surface area and low density, which make them attractive for many potential applications. A series of experiments was performed by which various of porous metal and ceramic oxides hollow spheres were obtained as a final products via hydrothermal approach. The as-obtained hollow oxides were characterized by SEM, TEM, XRD, IR and nitrogen adsorption isotherm (BET). Overall, my work has suggested that using simple sugar as sacrificial template in one-pot hydrothermal method is efficient to fabricate nano-sized oxides with hollow structure. I succeeded in fabricating nanospheres of SiO2 by applying glucose as sacrificial template by hydrothermal approach for the first time. In addition, I have applied fructose as a sacrificial template for fabricating Cr2O3, α-Fe2O3, Co3O4, NiO and ZnO with hollow structures for the first time to the best of our knowledge. Moreover, glucose have been successfully used for fabricating the previous oxides hollow spheres. Furthermore, correlations between the particle size and the concentration of the sugar as well as the ratio of the amount of substance of metal precursor and sugar are uncovered; moreover, important factors critical to fine-tune the final particle size and shape are temperature, reaction time and the addition of acetic acid as a catalyst. Considering that metal salt are used as the metal precursor and that the precursor is available for many metallic elements, I anticipate that using monosaccharide as sacrificial templates through hydrothermal approach can widen the accessible field of metal oxide hollow spheres.