Nanoscience and Nanotechnology Commons^™

Controlling The Emission Of Volatile Platinum Oxides To The Vapor Phase In Diesel Oxidation Catalysts, Arnab Ghosh

Nanoscience and Microsystems ETDs

Pt-based catalysts are used for the treatment of emissions from vehicles, particularly in Diesel oxidation catalysts (DOCs). Three-way catalysts are treated at temperatures ranging from 950℃-1050℃ while DOCs are aged at 800℃ for 50 hrs. At 800°C, Pt reacts with O₂ to form PtO₂ which has a high vapor pressure and can be transported through the vapor phase. These accelerated aging conditions lead to the formation of large Pt particles causing a loss of catalytic activity. In this thesis, we used model thin-film catalysts that made it possible to quantify the emission of Pt to the vapor phase …

The Physics Of Slot-Die And Gravure Coating Associated With Precision Thin Films And Coating Defects, Robert E. Malakhov

Nanoscience and Microsystems ETDs

Enabling future printable and flexible electronic (PFE) devices and technologies requires overcoming the technical challenge of manufacturing precision thin films and features at scale. Coating- and print-feature functionality for PFEs is imparted with dispersed active particulate inks that provide electronic properties via slot-die coating, a pre-metered film-deposition process, and gravure printing, a high-throughput, precision process. Both are poised to be ideal manufacturing technologies for PFEs but require further research to understand particulate effects in defect formation and processability. Therefore, overcoming the technical challenges of precision, throughput, and the complexities of particulate inks is the purpose of this work. For slot-die …

Investigating Scalable Manufacturing Of High-Conductivity Wires And Coatings From Ultra-Long Carbon Nanotubes, Pouria Khanbolouki

Mechanical Engineering ETDs

Carbon nanotubes (CNTs) are a promising candidate for next generation of electrical wirings and electromagnetic interference (EMI) shielding materials due to their exceptional mechanical and electrical properties. Wires and coatings from ultralong nanotubes that are highly crystalline, well-aligned and densely packed can achieve this goal. High-performance CNT conductors will be relatively lightweight and resistant to harsh conditions and therefore can potentially replace current conductors in many industries including aerospace, automotive, gas and oil.

This thesis investigates a new manufacturing approach, based on conventional solution coating and wire drawing methods, to fabricate high conductivity wires and coatings from ultra-long carbon nanotubes. …