<p>Iron oxide is the most common catalyst in
solid rocket propellant. We have previously demonstrated increased performance
of propellant by encapsulating iron oxide particles within ammonium perchlorate
(AP), but only nanoscale particles were used, and encapsulation was only
accomplished in fine AP (~20 microns in diameter). In this study, we extended the
size of particle inclusions to micron-scale within the AP particles as well the
particle sizes of the AP-encapsulated catalyst particles (100s of microns) using
fractional crystallization techniques with the AP-encapsulated particles as
nucleation sites for precipitation. Here we report catalyst particle inclusions
of micron-scale, as well as nanoscale, within AP and present characterization
of this encapsulation. Encapsulating micron-sized particles and growing these
composite particles could pave the way for numerous possible applications. A
study of the thermal degradation of these AP-encapsulated particles compared
against a standard mixture of iron oxide and AP showed that AP-encapsulated
micron-scale catalyst particles exhibited similar behavior to AP-encapsulated
nanoscale particles. Using computed tomography, we
found that catalyst particles were dispersed throughout the interior of coarse
AP-encapsulated micron-scale catalyst particles and decomposition was induced
within these particles around catalyst-rich regions.</p>
| Identifer | oai:union.ndltd.org:purdue.edu/oai:figshare.com:article/12206372 |
| Date | 29 April 2020 |
| Creators | Spencer A Fehlberg (8774588) |
| Source Sets | Purdue University |
| Detected Language | English |
| Type | Text, Thesis |
| Rights | CC BY 4.0 |
| Relation | https://figshare.com/articles/Decomposition_of_ammonium_perchlorate_encapsulated_nanoscale_and_micron-scale_catalyst_particles/12206372 |
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