Search for dissertations about: "OXIDE SURFACES"

Showing result 21 - 25 of 248 swedish dissertations containing the words OXIDE SURFACES.

2. 21. Physisorption of CO and N2O on ceria surfaces

   Author : Carsten Müller; Kersti Hermansson; Konstantin Neyman; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; ceria; carbon monoxide; nitrous oxide; embedded cluster; physisorption; method of increments; CCSD T ; vibrational frequencies; Quantum chemistry; Kvantkemi; Quantum Chemistry; kvantkemi;

   Abstract : Physisorption of CO and N2O on surfaces of ceria (CeO2) was investigated by means of high-level quantum-mechanical embedded cluster calculations. Both systems have high relevance in the field of environmental chemistry and heterogeneous catalysis. READ MORE

4. 22. Spatially Controlled Covalent Immobilization of Biomolecules on Silicon Surfaces

   Author : Elisabeth Pavlovic; Sven Oscarsson; Marcus Textor; Uppsala universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Biotechnology; silicon oxide; electrooxidation; sulfur; nanotechnology; self-assembled monolayers; atomic force microscopy; electron spectroscopy for chemical analysis; biomolecules; covalent immobilization; reversibility; Bioteknik; Bioengineering; Bioteknik;

   Abstract : The work described in this thesis aims to achieving surface patterning through chemical activation of thiolated silicon oxide surfaces, resulting in a spatially controlled covalent immobilization of biomolecules with high resolution.Existing chemical methods to immobilize molecules on surfaces do not reach below the micrometer scale while the ones allowing for spatial control mostly lead to non-covalent adsorption of molecules on surfaces, or require several successive chemical reactions to obtain the final covalent immobilization. READ MORE

5. 23. Engineering Surfaces of Solid-State Nanopores for Biomolecule Sensing

   Author : Shiyu Li; Shi-Li Zhang; Michael Mayer; Uppsala universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; solid-state nanopores; surface engineering; DNA sensing; DNA polymerase; optical detection; lipid bilayer; hafnium oxide; electron beam induced deposition;

   Abstract : Nanopores have emerged as a special class of single-molecule analytical tool that offers immense potential for sensing and characterizing biomolecules such as nucleic acids and proteins. As an alternative to biological nanopores, solid-state nanopores present remarkable versatility due to their wide-range tunability in pore geometry and dimension as well as their excellent mechanical robustness and stability. READ MORE

6. 24. Adsorption, desorption, and redox reactions at iron oxide nanoparticle surfaces

   Author : Lelde Krumina; MEMEG; []
   Keywords : Ferrihydrite; Goethite; Secondary metabolites; Reductive dissolution; Catalytic oxidation; hydroxyl radicals; Fenton reaction; SOM decomposition;

   Abstract : Iron oxide nanoparticles are involved in several important biogeochemical processes. The interfaces between aqueous solutions and iron oxide nanoparticle surfaces are found everywhere in nature, and the chemical and microbial processes occurring at these complex interfaces control e.g. nutrient and contaminant availability and transport. READ MORE

7. 25. Key Aspects of Sintering Powder Metallurgy Steel Prealloyed with Chromium and Manganese

   Author : Ola Bergman; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Manganese; Prealloyed; Sintering; Mechanical properties; Chromium; Spinel oxide; Powder metallurgy; PM steel; Oxide reduction; Residual oxides; Atmosphere;

   Abstract : The powder metallurgy (PM) process is a cost efficient near net-shape technology suitable for sustainable manufacturing of structural steel components. A drawback with the PM technology is the difficulty to use oxidation sensitive alloying elements, such as Cr and Mn. READ MORE