<p>The
research described in this dissertation focuses on several areas: developing
analytical methods to distinguish structural isomers, identifying the chemical
compositions of aviation fuels and evaluating the effectiveness of organic
dopants to swell aircraft o-ring seals. Chapter 2 discusses fundamental aspects
of mass spectrometry, and ionization methods and the instrumentation used to
complete this research. </p>
<p>Chapter
3 discusses and compares two activation methods used to distinguish ionized
structural isomers. Ionized naphthene-containing aromatic
structural isomers were subjected to collision-activated dissociation (CAD) in
an ion trap (ITCAD) and to medium-energy collision-activated dissociation
(MCAD) in an octupole collision cell, both in the energy-resolved mass
spectrometry mode (ERMS). MCAD was shown to be superior over ITCAD at the
structural differentiation of the ionized isomers. </p>
<p>Determination
of the chemical compositions of petroleum-based jet and diesel fuels, potential
alternative fuels and fuel blending components by using a GCxGC/(EI)TOF MS is discussed in
chapter 4. The ability to determine the chemical compositions
of fuels and to correlate the identified compounds and their concentrations to the
physical and chemical properties and aircraft performance of the fuels is vital
for the development of future resilient, alternative fuels. The chemical compositions of petroleum-based
fuels were found to be different from potential alternative fuels.</p>
<p>Chapter
5 discusses the effectiveness of aromatic and nonaromatic compounds in swelling
air craft o-ring seals, which prevents leaks in the fuel circulation systems. The aim of this study was to identify aromatic
and nonaromatic compounds that most effectively swell o-ring seals. Steric effects were shown to decrease the efficiency of the
compounds to swell seals. Ethylbenzene and indane were found to swell o-ring
seals more effectively than any other compounds studied, including a currently
approved alternative fuel. </p>
| Identifer | oai:union.ndltd.org:purdue.edu/oai:figshare.com:article/7629110 |
| Date | 10 May 2019 |
| Creators | Mark Romanczyk (6263273) |
| Source Sets | Purdue University |
| Detected Language | English |
| Type | Text, Thesis |
| Rights | CC BY 4.0 |
| Relation | https://figshare.com/articles/Developing_Mass_Spectrometric_Methods_for_Distinguishing_Isomers_Characterizing_Complex_Mixtures_and_Determining_the_Capability_of_Organic_Compounds_to_Swell_Aircraft_O-ring_Seals/7629110 |
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