Sökning: "Chemical physics"
Visar resultat 11 - 15 av 762 avhandlingar innehållade orden Chemical physics.
11. Photoluminescence Characteristics of III-Nitride Quantum Dots and Films
Sammanfattning : III-Nitride semiconductors are very promising in both electronics and optical devices. The ability of the III-Nitride semiconductors as light emitters to span the electromagnetic spectrum from deep ultraviolet light, through the entire visible region, and into the infrared part of the spectrum, is a very important feature, making this material very important in the field of light emitting devices. LÄS MER
12. First Principles Calculations for NOx Reduction over Ag/Al2O3
Sammanfattning : .... LÄS MER
13. Spectroscopic investigation of palladium catalysts during wet methane oxidation
Sammanfattning : Abatement of the strong greenhouse gas methane in vehicle applications by use of catalytic end-of-pipe technologies is challenging due to the prevailing reaction conditions with low temperatures and high water content. In this thesis, the mechanisms behind low-temperature water inhibition of lean methane oxidation over palladium-based catalysts have been studied using an integrated experimental approach including wet-chemical preparation of model catalysts with systematic variation of key performance parameters, transient measurements of reaction kinetics in chemical flow reactor, and operando infrared and X-ray absorption spectroscopic characterisation. LÄS MER
14. Nanobubbles in water - how to identify them and why they are stable
Sammanfattning : Gas bubbles smaller than 1 micrometer in water, commonly referred to as nanobubbles, is a growing field of research and innovation. Applications range from medical imaging and drug delivery to mining industry and environmental remediation. LÄS MER
15. Spectroscopic characterisation of surface hydroxyls during catalytic methane oxidation
Sammanfattning : Implementation of methane rich fuels as to develop sustainable vehicle transports requires improved catalytic exhaust aftertreatment technologies to convert engine-out methane emissions to carbon dioxide and water by total oxidation. A main challenge is that water formed during combustion inhibits the methane oxidation reaction even over the most active palladium-based catalysts presently known. LÄS MER
