A Parametric Study Regarding The Influence of Fabrication Methods on The Explosive Characteristics of Porous Silicon

Over the past decade, extensive research has explored the reactive properties of porous silicon (PSi) when combined with chemical oxidizers. PSi detonations, capable of precise and reproducible thrust, have the potential to be utilized for advanced micro-thruster applications. By adjusting fabrication and oxidation parameters, it is possible to enhance the reactivity of chemically oxidized PSi. Changing these parameters can also provide valuable insights into the energetic yield of PSi, thus allowing optimization of propulsion characteristics. This parametric study focuses on performing the electrochemical anodization of bulk silicon (Si), using a 3:1 ratio of 49% hydrofluoric acid to ethanol (HF:EtOH) with varying current densities and anodization times to fabricate PSi. A 3.2Mol sodium perchlorate methanol solution is then applied to the PSi substrate as an oxidizer. The samples are subsequently dried using one of three methods: atmospheric drying, vacuum drying and drying in a nitrogen box. Variable drying times for each method are also reviewed. Finally, a bomb calorimeter is employed to analyze the combustive properties of the PSi samples. The results of this analysis are used to identify the optimal fabrication parameters for achieving maximum energy yield from a PSi detonation.