| Fe3O4, TiO2 and their composite have been investigated and synthesized in this paper. The synthesis of low-dimensional materials with different morphologies and compositions also was explored. By a simple wet chemical method and hydrothermal method, we successfully synthesized dendritic magnetic nanomaterials, recyclable photocatalytic membrane, magnetic photocatalytic and multifunctional hollow core-shell drug release materials. Transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), superconducting quantum interference device (SQUID) and UV-visible absorption (UV-vis) were used to characterize these mirco- and nano-materials. The results are below:A method for the growth and self-assembly of Fe3O4 nanoparticles that is template assisted, as well as gas diffusion and surface tension controlled, has been developed at room temperature. Well-defined dendrite patterns of Fe3O4 nanoparticles were obtained upon ion (Fe3+/Fe2+) entrapment in a polyethylene glycol solution followed by NH3 gas exposure on the surface of an aqueous solution on the glass substrate. This dendrite patterns have superparamagnetic behavior at room temperature. The effects of Fe2+/Fe3+ concentration on dendrite patterns of Fe3O4 nanoparticles also have been studied. The thus-formed patterns mimic nature's ice ?owers found on glass windows during frost.Heteronanostructures of Ag particles on titanate nanofibres were synthesized by a seed induced method, and the hetero-nanofibres were organized into catalytic membrane. The hetero-nanostructure membrane has shown similar character with titanate nanofibre one, such as flexible, stability, and self-supporting properties. The Ag/TiO2 nanofibre heterostructure films show high activity in photodegradation of methamidophos in aqueous solution and light sterilization. The recycling of nanofibre membranes makes it potentially useful in photocatalyst, catalyzer, antiseptic and the environmental pollution treatment.Based on the previous studies on photocatalytic, we successfully obtained hollow Fe3O4@TiO2@ Ag composite microspheres using the solution method and hydrothermal method. Disposal of TiO2 shell by hydrothermal method and Ag was used to develope magnetic photocatalytic's activity. This kind of material may also be used in Surface enhanced Raman spectroscopy (SERS) nanoprobes et.al.Hollow@Fe3O4@hollow@TiO2@CdTe@mesoporous silicon core-shell structure was further studied for new drug carrier. This drug carrier which combined magnetic properties, quantum dot fluorescence properties and the controlled-release properties of porous silicon can be controlled to a location and be controlled-release.This drug carrier may be used in drug release of cancer treatment. |
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