2026-09-22T21:49:47Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/115936 2023-07-11 col_2142_5131 col_2142_14787 com_2142_5130 com_2142_9630 com_2142_234

Cai, Lili 2022-08 application/pdf en text Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-08-01 The student, Adrian Manjarrez, accepted the attached license on 2022-07-14 at 08:17. The student, Adrian Manjarrez, submitted this Thesis for approval on 2022-07-14 at 08:29. This Thesis was approved for publication on 2022-07-19 at 09:33. DSpace SAF Submission Ingestion Package generated from Vireo submission #18299 on 2022-11-16 at 10:56:10 Atmospheric-pressure flame vapor deposition of nanocrystalline diamonds in methane/hydrogen/air flat flames Manjarrez, Adrian 2022-07-19 Nanocrystalline diamond atmospheric pressure flat flame methane Nanocrystalline diamonds have become attractive for advancing many existing technologies and materials, owed to their superb mechanical, thermal, and optical properties, among others. Yet, current methods utilized in diamond growth must be improved to provide high quality growth of particles and films at low costs and improved scalability. Presented here is the flame vapor deposition (FVD) of nanodiamond particles and films in methane-hydrogen-air flat flames at atmospheric pressure. Due to the synthesis at atmospheric pressure and the larger area of the burner, diamond growth can be scaled up at lower costs and in a more time efficient manner. This method also allows for the growth of nanocrystalline diamond to be more finely controlled by tuning parameters such as the gas flow rates, substrate material, and seeding density. Moreover, the addition of an external electric bias is shown to be influential in controlling the porosity and thickness of the NCD films. Notably, this method also provides new growth conditions beyond the previously considered diamond-growth region of the C-H-O phase diagram. Overall, with the low cost and simple for operation, the atmospheric-pressure FVD approach will offer opportunities to facilitate the scaling-up of NCD synthesis. Thesis eng https://hdl.handle.net/2142/115936 Copyright 2022 Adrian Manjarrez M.S. Thesis Mechanical Engineering University of Illinois at Urbana-Champaign Mechanical Sci & Engineering