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Development Of Graphene-Filled Fluoropolymer Composite Coatings For Condensing Heat Exchangers, Mitchell Jacob Cierpisz
Development Of Graphene-Filled Fluoropolymer Composite Coatings For Condensing Heat Exchangers, Mitchell Jacob Cierpisz
Electronic Theses and Dissertations
Low-temperature waste heat recovery employs condensing heat exchangers to recover both sensible and latent heats. Due to the condensation of flue gases within these heat exchangers, they are subjected to severe corrosion. Perfluoroalkoxy (PFA) has been applied as a barrier layer on the surfaces of these heat exchangers for the prevention of corrosion. However, PFA has exhibited poor thermal properties and durability, which are requirements in low-temperature heat recovery applications. In this thesis, carbon-based nano-materials (8 nm and 60 nm thickness graphene particles and multi-walled carbon nanotubes, MWCNT) were incorporated into fluoropolymer (PFA) powders to generate thermally conductive and corrosion …
Friction Mechanisms Of 2d Materials--Graphene And Mos2--In Different Environments: Effects Of Sliding Induced Defects, Zaixiu Yang
Friction Mechanisms Of 2d Materials--Graphene And Mos2--In Different Environments: Effects Of Sliding Induced Defects, Zaixiu Yang
Electronic Theses and Dissertations
This dissertation focuses on studying sliding friction mechanisms of two-dimensional (2D) materials, namely graphene and MoS2, and delineating the effects of structural defects on their coefficient of friction (COF) values under different test atmospheres. Raman, SEM and cross-sectional TEM studies of samples and counterfaces before and after the wear tests in inert and air atmospheres with different relative humidity (RH) levels were used to identify initial microstructures and formation of sliding induced defects at the wear tracks and within the transferred layers. Using density functional theory (DFT) calculations the roles of undissociated and dissociated H2O molecules at defect sites of …