Sökning: "low energy electron diffraction"

Visar resultat 26 - 30 av 109 avhandlingar innehållade orden low energy electron diffraction.

1. 26. Chemically Modified Metal Oxide Nanostructures Electrodes for Sensing and Energy Conversion

   Författare :Sami Elhag; Omer Nour; Magnus Willander; Alberta Bonanni; Linköpings universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Metal oxide nanostructures; mixed metal oxide nano-compound; low temperature wet-chemical growth; chemically modified electrode; doping; surfactant; potentiometric sensor; chemical sensor and photo-electrochemical activity;

   Sammanfattning : The goal of this thesis is the development of scalable, low cost synthesis of metal oxide nanostructures based electrodes and to correlate the chemical modifications with their energy conversion performance. Methods in energy conversion in this thesis have focused on two aspects; a potentiometric chemical sensor was used to determine the analytical concentration of some components of the analyte solution such as dopamine, glucose and glutamate molecules. LÄS MER

3. 27. Development of new nanomaterials syntheses for mesostructured TiO2 and SiO2

   Författare :Erik Nilsson; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; X-ray diffraction; microemulsion synthesis; silica; high-resolution electron microscopy; gelation; nonionic amphiphiles; EISA; titania; mesostructured; waterglass;

   Sammanfattning : Mesostructured materials is a class of materials within the concept nanomaterials andcharacterized by structural features on the length scale 2-50 nm. This group of materials isinteresting for several applications such as, membrane and separation technology, heterogeneouscatalysis, controlled release, adsorption of pollutants, solar energy conversion, electrode materialsetc. LÄS MER

4. 28. Structure of Hardened Cement-Fly Ash Systems and Their Related Properties

   Författare :Aimin Xu; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; water vapour sorption isotherms; thermogravity analysis; mortar; scanning electron microscopy; differential thermal analysis; X-ray diffraction analysis; fly ash; pore structure; microstructure; cement paste;

   Sammanfattning : The influence of fly ash on the pore structure and microstructure of cement paste and mortar has been investigated. The methods applied include water vapour sorption isotherms, scanning electron microscopy, X-ray diffraction analysis and thermogravity/differential thermal analysis. LÄS MER

5. 29. Surface integrity on post processed alloy 718 after nonconventional machining

   Författare :Jonas Holmberg; Tomas Beno; Anders Wretland; Johan Berglund; Mikael Olsson; RISE; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Alloy 718; Non-conventional machining; post processing; surface integrity; Microstructure; Residual stress; Electron back scattering diffraction; Material removal rate; Manufacturing; Surface and Joining Technology; Bearbetnings-; yt- och fogningsteknik; Production Technology; Manufacturing and materials engineering;

   Sammanfattning : There is a strong industrial driving force to find alternative production technologies in order to make the production of aero engine components of superalloys even more efficient than it is today. Introducing new and nonconventional machining technologies allows taking a giant leap to increase the material removal rate and thereby drastically increase the productivity. LÄS MER

7. 30. Synthesis and Characterisation of Ultra Thin Film Oxides for Energy Applications

   Författare :Mattis Fondell; Mats Boman; Tomas Edvinsson; Andreas Lindblad; Christophe Detavernier; Uppsala universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Atomic Layer Deposition; Iron oxides; Hematite; Solar Water Splitting; Hard X-Ray Photoelectron Spectroscopy;

   Sammanfattning : This thesis describes studies of materials which can be exploited for hydrogen production from water and sunlight. The materials investigated are maghemite (γ-Fe2O3), magnetite (Fe3O4) and especially hematite (α-Fe2O3), which is an iron oxide with most promising properties in this field. LÄS MER