{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/124711"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/124711","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Mass transfer diffusion coefficient as a proxy for hydrophobic coating durability","abstract":"Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-05-01","abstract_html":"Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-05-01","abstract_has_math":false,"creators":["Bakhshi, Alireza"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":["Miljkovic, Nenad"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2024,"date_issued":"2024-05","date_published":"2024-05","updated_at":"2026-07-22T22:25:02Z","subjects":["Hydrophobic Coatings","Parylene C","Coating Thickness","Water Diffusion","Accelerated Testing","Durability","Dissolvable Substrate","Diffusion Coefficient","Temperature Dependence"],"languages":["en","eng"],"rights":["Copyright 2024 Alireza Bakhshi"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/2142/124711","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Miljkovic, Nenad"]},{"key":"dc:creator","label":"Author","values":["Bakhshi, Alireza"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2024-05","2024-05-01"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Mechanical Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Hydrophobic Coatings","Parylene C","Coating Thickness","Water Diffusion","Accelerated Testing","Durability","Dissolvable Substrate","Diffusion Coefficient","Temperature Dependence"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en","eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2024 Alireza Bakhshi"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://hdl.handle.net/2142/124711"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-05-01","The student, Alireza Bakhshi, accepted the attached license on 2024-04-26 at 14:12.","The student, Alireza Bakhshi, submitted this Thesis for approval on 2024-04-26 at 14:29.","This Thesis was approved for publication on 2024-05-01 at 16:01.","DSpace SAF Submission Ingestion Package generated from Vireo submission #20665 on 2024-09-16 at 00:51:03","Hydrophobic coatings are designed to repel water. Durability increases with the thickness of these coatings, while thinner coatings are preferred for energy-related applications because they offer less thermal resistance. Therefore, there is an optimal thickness for such coatings. Durability tests, which expose the coatings to relevant operational conditions like steam condensation, can take years based on specific durability and qualification needs. To speed up these evaluations, it is crucial to develop accelerated methods for lifetime testing. In this study, we introduce a simple method for assessing the durability of hydrophobic coatings by using a dissolvable substrate and submerging the coated sample in hot water. We monitor the sample's mass to uncover detailed degradation patterns, which allows us to measure the water diffusion coefficient through the coating experimentally. We use Parylene C (poly-chloro-p-xylylene) as a prototype coating system to analyze absorption data and validate our findings against those from a year-long steam condensation test. Our findings indicate that the diffusion coefficient for Parylene C decreases as the coating thickness decreases, which suggests high durability for ultra-thin films (approximately 100 nm). Conversely, durability significantly improves in thicker films (around 5 μm), which can be attributed to various interconnected physical and chemical interactions at the coating interface."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Mass transfer diffusion coefficient as a proxy for hydrophobic coating durability"]}]}],"canonical_facts":{"dc:contributor":["Miljkovic, Nenad"],"dc:creator":["Bakhshi, Alireza"],"dc:date":["2024-05","2024-05-01"],"dc:description":["Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-05-01","The student, Alireza Bakhshi, accepted the attached license on 2024-04-26 at 14:12.","The student, Alireza Bakhshi, submitted this Thesis for approval on 2024-04-26 at 14:29.","This Thesis was approved for publication on 2024-05-01 at 16:01.","DSpace SAF Submission Ingestion Package generated from Vireo submission #20665 on 2024-09-16 at 00:51:03","Hydrophobic coatings are designed to repel water. Durability increases with the thickness of these coatings, while thinner coatings are preferred for energy-related applications because they offer less thermal resistance. Therefore, there is an optimal thickness for such coatings. Durability tests, which expose the coatings to relevant operational conditions like steam condensation, can take years based on specific durability and qualification needs. To speed up these evaluations, it is crucial to develop accelerated methods for lifetime testing. In this study, we introduce a simple method for assessing the durability of hydrophobic coatings by using a dissolvable substrate and submerging the coated sample in hot water. We monitor the sample's mass to uncover detailed degradation patterns, which allows us to measure the water diffusion coefficient through the coating experimentally. We use Parylene C (poly-chloro-p-xylylene) as a prototype coating system to analyze absorption data and validate our findings against those from a year-long steam condensation test. Our findings indicate that the diffusion coefficient for Parylene C decreases as the coating thickness decreases, which suggests high durability for ultra-thin films (approximately 100 nm). Conversely, durability significantly improves in thicker films (around 5 μm), which can be attributed to various interconnected physical and chemical interactions at the coating interface."],"dc:format":["application/pdf"],"dc:identifier":["https://hdl.handle.net/2142/124711"],"dc:language":["en","eng"],"dc:rights":["Copyright 2024 Alireza Bakhshi"],"dc:subject":["Hydrophobic Coatings","Parylene C","Coating Thickness","Water Diffusion","Accelerated Testing","Durability","Dissolvable Substrate","Diffusion Coefficient","Temperature Dependence"],"dc:title":["Mass transfer diffusion coefficient as a proxy for hydrophobic coating durability"],"dc:type":["text"],"thesis:degree_discipline":["Mechanical Engineering"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:02Z"}