Seton Hall University
Epoxy Siloxane Self-Cleaning Coating using F64PcZn/TiO2 Photocatalyst Composite
Abstract
dc:description.abstract<p>A new photocatalytic composite powder incorporated into a siloxane epoxy polymer has been shown to yield a highly efficient self-cleaning coating. The composite, which makes greater use of light in the visible/near-infrared (NIR) region, was prepared by coating a nano-particle photocatalytic TiO<sub>2</sub> with 3% w/w of F<sub>64</sub>PcZn photosensitizer resulting in a dark green powder. The F<sub>64</sub>PcZn/P25 TiO<sub>2</sub> composite exhibited a greater photo-induced degradation of methyl red, a model surface contaminant, compared to traditional nano-particle photocatalytic TiO<sub>2</sub>. Singlet oxygen (<sup>1</sup>Δ<sub>g</sub> <sup>1</sup>O<sub>2</sub>), generated form the F<sub>64</sub>PcZn, is believed to be the primary species responsible for the observed photo-activity. The durability of the coating was evaluated by electrochemical impedance spectroscopy (EIS) due to the potential for unwanted photo-oxidation of the polymer by the photocatalytic material. After 11 weeks of atmospheric sunlight exposure, the coating containing the composite displayed a small drop in impedance value but still remained >10 GOhm cm<sup>2</sup>, indicating the formation of a strong barrier that is able to protect the underlying metal surface. A control coating containing uncoated nano-particle photocatalytic TiO<sub>2</sub> dropped slightly lower to ~10 GOhm cm<sup>2</sup>. The novelty of the disclosed composite for producing self-coatings was recognized by the US Patent Office, US 9,260,630 B2.</p>
Degree
thesis:*- Name thesis:degree_name
- MS Chemistry
- Level thesis:degree_level
- Thesis
- Discipline thesis:degree_discipline
- Chemistry and Biochemistry
- Year dc:date.available
- 2016
Author and committee
dc:creator, dc:contributor.*- Author dc:creator
-
- Sullivan, James F.
- Contributors dc:contributor
-
- Sergiu M. Gorun, Ph.D
- James E. Hanson, Ph.D
- Wyatt R. Murphy, Ph.D
Subjects
dc:subject × 8Identifiers
dc:identifier.*- Repository record dc:identifier
- https://scholarship.shu.edu/dissertations/2171
- OAI identifier oai:identifier
- oai:scholarship.shu.edu:dissertations-3216