Synthesis and characterization of silica nanoparticles and magnetite/silica/titania core shell nanocomposites

Kho, Sze Yun (2013) Synthesis and characterization of silica nanoparticles and magnetite/silica/titania core shell nanocomposites. Masters thesis, University Malaysia Sarawak, UNIMAS.

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Abstract

The aims of this study were to synthesize and characterize silica based inorganic nanocomposite materials. The core shell nanocomposites prepared from magnetite, silica and titania was developed. Silica nanoparticles of different mean sizes (60 to 300 nm) were successfully prepared by varying experimental conditions, i.e. the effect of [H2O]/[TEOS] ratios, ammonia concentration, dialysis, amount of polyethylene glycol (PEO) and polyvinyl pyrrolidone (PVP). Silica xerogels of tailored microstructure were obtained through mixing silica nanoparticles from different mean sizes and addition of polymeric surfactants. Magnetite/silica/titania (Fe3O4/SiO2/TiO2) core shell nanocomposites of mean diameter of 140 nm and average BET specific surface area of 140 m2/g were also successfully prepared. The synthesis route used for this preparation is simple and less time consuming without the aid of any surfactant. The photocatalytic and magnetic properties of the Fe3O4/SiO2/TiO2 core shell nanoparticles were evaluated.

Item Type: Thesis (Masters)
Additional Information: Thesis (M.Sc.) -- Universiti Malaysia Sarawak, 2013
Uncontrolled Keywords: silica, magnetite,titania, mean sizes, microstructures, photocatalytic,unimas, university, universiti, Borneo, Malaysia, Sarawak, Kuching, Samarahan, ipta, education, Postgraduate, research, Universiti Malaysia Sarawak
Subjects: Q Science > QD Chemistry
Divisions: Academic Faculties, Institutes and Centres > Faculty of Resource Science and Technology
Depositing User: Karen Kornalius
Date Deposited: 05 Nov 2015 02:19
Last Modified: 22 May 2020 08:37
URI: http://ir.unimas.my/id/eprint/9401

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