Preparation Of Inorganic Nanostructured Material, And Study On Fe₃O₄/SiO₂ Composite Materials

Nano- SiO₂ particles ,Nanometer magnetite (Fe₃O₄) particles and nanocomposites are widely used in many fields of advanced technology, In this article, using the hydrolysis of tetraethyl orthosilicate to preparation nano- SiO₂ colloid, the particle shape were studied by SEM . it was prepared from tetraethyl orthosilicate, distilled water, ethanol,ammonia , general preparation methods were discussed, and used granularity apparatus(3000HSA)to measure these granularity.Through some parallel experiment,the author fished out experiment condition about impacting the granularity of nano- SiO₂ . The result indicated that, the dosage of tetraethyl orthosilicate, distilled water, ethanol,ammonia affect obviously the size of Nano- SiO₂ particles.And using dynamic light dispersion way inspect the change of the size of Nano- SiO₂ particles, The result makes know that the size of particles is obvious accretion firstly and minish during the hydrolytic polycondensation of TEOS. The formation mechanisms of the resultant SiO₂ particles under different reaction conditions were carefully investigated and discussed. Discussed initially surface modification of Nano-SiO₂ Powder.Nanometer magnetite (Fe₃O₄) particles were prepared by chemical co-precipitation in this work, NH3H2O was chosen to act as precipitating agent,which was added to mixed aqueous solution containing ferric and ferrous ions to produce nano-Fe₃O₄ particles. In order to make nano-Fe₃O₄ particles have favorable decentralization, accede to a small quantity of ethanol and oleic acid. Using SEM and XRD chart to characterization ,proving nano-Fe₃O₄ particles is roundness by this preparation method , decentralization is favorable, colour and luster is black.Finally, in this article study on preparation and characterization of the Nanometer magnetite Fe₃O₄/ SiO₂ particles initially. The size of nano-composite particles is about 15-20nm , decentralization is favorable.