Sökning: "catalytic effects"

Visar resultat 11 - 15 av 229 avhandlingar innehållade orden catalytic effects.

  1. 11. Nanoplasmonic Spectroscopy of Single Nanoparticles Tracking Size and Shape Effects in Pd Hydride Formation

    Författare :Svetlana Syrenova; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; hole-mask colloidal lithography; enthalpy of formation; palladium nanoparticles and nanocrystals; metal-hydrogen interactions; shrinking-hole colloidal lithography; localized surface plasmon resonance; dark field scattering spectroscopy; single particle spectroscopy; nanoscale effects; plasmonic sensors;

    Sammanfattning : Localized surface plasmon resonance (LSPR) is a phenomenon of collective oscillation of conduction electrons in metal nanoparticles smaller than the wavelength of light that is used for its excitation. Plasmonic metal nanoparticles are able to confine light to extremely small volumes around them, i.e. below the diffraction limit. LÄS MER

  3. 12. On electrostatic effects, minimal motion and other catalytic strategies used by enzymes

    Författare :Per-Olof Syrén; Karl Hult; Jiri Damborsky; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biochemistry; Biokemi; SRA - Molecular Bioscience; SRA - Molekylär biovetenskap;

    Sammanfattning : Enzymes are powerful biocatalysts that provide rate accelerations of up to 1019 fold compared to the corresponding uncatalyzed reaction in solution. The origin of the remarkable performance displayed by enzymes has fascinated and puzzled researchers for over a hundred years. LÄS MER

  4. 13. Wall Related Lean Premixed Combustion Modeled with Complex Chemistry

    Författare :Johan Andrae; KTH; []
    Nyckelord :Wall effects; premixed flames; flame quenching; numerical modeling; chemkin; boundary layer approximation; gasified biomass; fuel-NOx; hybrid catalytic combustor.; NATURAL SCIENCES; NATURVETENSKAP;

    Sammanfattning : Increased knowledge into the physics and chemistrycontrolling emissions from flame-surface interactions shouldhelp in the design of combustion engines featuring improvedfuel economy and reduced emissions. The overall aim of this work has been to obtain afundamental understanding of wall-related, premixed combustionusing numerical modeling with detailed chemical kinetics. LÄS MER

  5. 14. Modeling environment effects on spectroscopic properties of biomarkers and catalytic mechanisms in enzymes

    Författare :Camilla Gustafsson; Patrick Norman; Daniel Escudero; KTH; []
    Nyckelord :Computational chemistry; spectroscopy; biocatalysis; water flow; biomarkers; Teoretisk kemi och biologi; Theoretical Chemistry and Biology;

    Sammanfattning : Arguably, humans are in need of both better diagnostic tools to prevent pro- gression of diseases as well as greener catalysts for synthesis of chemicals.Neurodegenerative diseases affecting neurons in the brain leads to demen- tias, where Alzheimer’s disease (AD) is the most prevalent. LÄS MER

  7. 15. Development of Catalytic ElectrophilicTrifluoromethylation and Fluorination Methods

    Författare :Nadia Ilchenko; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : This thesis is focused on development of new catalytic, electrophilic fluorination and trifluoromethylation methods of alkenes. These reactions were carried out using hypervalent trifluoromethyl and fluoroiodine reagents.The first project involved copper catalyzed oxytrifluoromethylation of terminal alkenes and alkynes. LÄS MER