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madaah-hoseini--hamid-reza
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Manufacturing of Magnesium-based Janus Micromotors Capable of Moving in Aqueous Environment and Magnetic Guidance for Biomedical Applications
, M.Sc. Thesis Sharif University of Technology ; Madaah Hoseini, Hamid Reza (Supervisor)
Abstract
Our goal in this research is to fabricate janus micromotors capable of moving in aquious media and being manipulated by an external magnetic field. Such devices were made via attaching magnetic nanoparticles to the surface of magnesium janus motor. The FTIR study proved their existance and physical attraction to the surface of the motors. They were easily navigated through a static magnetic field and janus motors aligned their motion to the direction of magnetic field. The anisotropic geometry of janus micromotors were verified through scaning electron microscope and elemental analysis. Biocompatibility of magnetised janus motors were examined through mtt assay and it was shown that the...
Microemulsion Synthesize of Fe3O4/TiO2 Core-Shell Nanoparticles
, M.Sc. Thesis Sharif University of Technology ; Madaah Hoseini, Hamid Reza (Supervisor)
Abstract
In this study magnetite nanoparticles were synthesized by microemulsion and were coated with TiO2 by a precipitation technique. The synthesize process were done under fixed molar ratio of various constituents of microemulsion and molar ratio of water to oil. Results of X-ray diffraction spectroscopy (XRD) showed that the uncoated nanoparticles were consisted of magnetite as the major phase and no other detectable phases such as pure iron or hematite were found. Field emission scanning electron microscopy (FE-SEM) results showed that the synthesized nanoparticles small size and narrow particle size distribution. For TiO2 coating process the effect of TBOT concentration, water concentration,...
Study of Microstructure and Wear behavior of In-Situ Al/Al3Ti Composite Coating on Commercial Pure Al Produced by Aluminum Cored Wires and TIG Process
, M.Sc. Thesis Sharif University of Technology ; Kokabi, Amir Hosein (Supervisor) ; Madaah Hoseini, Hamid Reza (Supervisor)
Abstract
Recently, Aluminum alloys have been the materials of choice for both military aircraft and automotive industries due to their high strength-to-weight ratio, high electrical and thermal conductivities and excellent corrosive resistance. However, their applications have been limited due to the low yield stress and wear resistance. In order to improve the surface wear resistance, structural and chemical surface modifications such as producing composite coatings could be applied. Gas Tungsten Arc welding (GTAW) process can be used to produce alloy and composite surface layers on different substrates. In this research, GTAW process and aluminum cored wires were used for coating of Al/Al3Ti...