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Hydrogenation of titanium foil and titanium based nanoparticles

Heemstra, R.B. (2017) Hydrogenation of titanium foil and titanium based nanoparticles. Bachelor's Thesis, Physics.

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The aim of the present research was to produce titanium hydride precipitates in titanium, in such a way, that crystallographically sharp interfaces are present between the titanium and titanium hydride which can be investigated by transmission electron microscopy (TEM). In order to achieve this titanium disks were ground, polished, electrochemically etched to achieve electron transparency, and subsequently hydrogenated. Producing clearly detectable titanium hydride precipitates proved to be not trivial. A final successful procedure was to put the Ti-foil under 2 bar H2 pressure, at 250◦C for 3 hours and 25 minutes, after which the sample was left to anneal at 100◦C, still under 2 bar H2 pressure for 4 days, in order to let the TiH2 precipitates grow. The sample had clear TiH2 precipitates, it was however too thick to send to Eindhoven for imaging the hydrogen atomic columns in between the Ti-atomic columns. MgTiPd nanoparticles were also made on a home-modified sputtering machine using H2 as a sputtering agent, which automatically partially hydrogenates the particles. The particles degraded (started ”bleeding”) when exposed to oxygen for long times (days to weeks). So further improvements need to be made to prevent this degradation and create stable nanoparticles. For example, creating more of a core-shell structure with Mg as the shell, which (partially) oxidizes into an MgO shell, which protects the interior of the nanoparticle.

Item Type: Thesis (Bachelor's Thesis)
Degree programme: Physics
Thesis type: Bachelor's Thesis
Language: English
Date Deposited: 15 Feb 2018 08:28
Last Modified: 15 Feb 2018 08:28

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