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Phenyl-modified phosphosilicate gels for proton conductivity
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Title
Phenyl-modified phosphosilicate gels for proton conductivity
Name
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Joseph
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Lorne S.
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Lorne S. Joseph
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author
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Klein
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Lisa
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Lisa C Klein
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Advisory Committee
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chair
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Birnie
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Dunbar P
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Dunbar P Birnie
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member
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Garofalini
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Stephen
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Stephen Garofalini
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Advisory Committee
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member
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Jitianu
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Andrei
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Andrei Jitianu
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Advisory Committee
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member
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Rutgers University
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School of Graduate Studies
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theses
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2023
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2023-01
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2023
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English
Abstract
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Proton (H+) transport in membranes and solid electrolytes leads to their potential use in fuel cells and chemical sensors. Phenyl and zirconia modified phosphosilicate gels were successfully synthesized and demonstrate interesting properties that suggest that these materials have future use as proton conductors. The amount of substitution and the amount of zirconia have been varied. Conductivity measurements using a Four-Point Probe were used to determine the effects of the substitutions on proton conduction in the gel samples. The highest value of conductivity was 1.48E-05 S/m for the sample with 5 wt.% PhTES and 5 wt.% TPZr (5PPS-5Z). The molecular structure of the gels was investigated using FTIR and Raman spectroscopy, to identify hydroxyls and phenyl groups, and the presence of bridging oxygen bonds in the samples. The FTIR transmission spectra explain the nature of the functional groups that are present in the three samples and the Raman spectra display the characteristic peaks for a silica and phosphate network. The samples were also subjected to nanoindentation, it was observed that samples with phenyl substitutions showed some plasticity, while samples without phenyl substitution were brittle. The results of the BET analysis indicate that all three samples have minimal surface area that is accessible to nitrogen. The pore volume is also very low, indicating that the compositions with and without phenyl substitutions have almost no measurable pore volume. The water adsorption studies for samples at 99 % RH for about one hour show a steady increase in the samples mass. The samples, despite being phenyl modified are still able to take in water. The substitution of a phenyl group on the silica precursor as well as the addition of zirconium (IV) ions in the formulation of phosphosilicate gels for proton conduction has interesting effects on the mechanical, structural, thermal and transport properties.
Subject
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Topic
Engineering
Subject
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Topic
Materials Science
Subject
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Topic
Phosphosilicate
Subject
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Topic
Proton conductivity
Subject
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Topic
Sol-gel
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Rutgers University Electronic Theses and Dissertations
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http://dissertations.umi.com/gsnb.rutgers:12235
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Extent
95 pages
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Ph.D.
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Includes bibliographical references
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Includes vita
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School of Graduate Studies Electronic Theses and Dissertations
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rucore10001600001
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NjNbRU
Identifier
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doi:10.7282/t3-rfy0-k059
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Rights
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The author owns the copyright to this work.
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Name
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Joseph
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Lorne
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S
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Permission or license
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2023-02-23T11:09:36
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Lorne S Joseph
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Affiliation
Rutgers University. School of Graduate Studies
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Author Agreement License
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I hereby grant to the Rutgers University Libraries and to my school the non-exclusive right to archive, reproduce and distribute my thesis or dissertation, in whole or in part, and/or my abstract, in whole or in part, in and from an electronic format, subject to the release date subsequently stipulated in this submittal form and approved by my school. I represent and stipulate that the thesis or dissertation and its abstract are my original work, that they do not infringe or violate any rights of others, and that I make these grants as the sole owner of the rights to my thesis or dissertation and its abstract. I represent that I have obtained written permissions, when necessary, from the owner(s) of each third party copyrighted matter to be included in my thesis or dissertation and will supply copies of such upon request by my school. I acknowledge that RU ETD and my school will not distribute my thesis or dissertation or its abstract if, in their reasonable judgment, they believe all such rights have not been secured. I acknowledge that I retain ownership rights to the copyright of my work. I also retain the right to use all or part of this thesis or dissertation in future works, such as articles or books.
Copyright
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Copyright protected
Availability
Status
Open
Reason
Permission or license
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2022-09-30T22:58:22
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2023-01-19T16:07:39
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