Sökning: "ternary surface complex"

Visar resultat 1 - 5 av 24 avhandlingar innehållade orden ternary surface complex.

  1. 1. Coordination Chemistry of Monocarboxylate and Aminocarboxylate Complexes at the Water/Goethite Interface

    Författare :Katarina Norén; Per Persson; Staffan Sjöberg; Stephan J. Hug; Umeå universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Acetate; benzoate; adsorption; surface complex; ternary surface complexes; ATR-FTIR spectroscopy; EXAFS spectroscopy.; cyclohexanecarboxylate; sarcosine; MIDA; EDDA; EDTA; gallium III ; goethite; mineral surface; Chemistry; Kemi;

    Sammanfattning : This thesis is a summary of five papers with focus on adsorption processes of various monocarboxylates and aminocarboxylates at the water/goethite interface. Interaction of organic acids at the water/mineral interfaces are of importance in biogeochemical processes, since such processes have potential to alter mobility and bioavailability of the acids and metal ions. LÄS MER

  3. 2. Phase transformation and surface chemistry of secondary iron minerals formed from acid mine drainage

    Författare :Jörgen Jönsson; Lars Lövgren; Per Persson; Staffan Sjöberg; Douglas B Kent; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Inorganic chemistry; schwertmannite; goethite; lepidocrocite; acid mine drainage; sulphate; natural organic matter; mineral surface; infrared spectroscopy; EXAFS; XRD; ternary surface complex; copper II ; cadmium II ; lead II ; zinc II ; Oorganisk kemi; Inorganic chemistry; Oorganisk kemi; Inorganic Chemistry; oorganisk kemi;

    Sammanfattning : The mining of sulphidic ore to extract metals such as zinc and copper produces huge quantities of waste material. The weathering and oxidation of the waste produces what is commonly known as Acid Mine Drainage (AMD), a dilute sulphuric acid rich in Fe(II) and heavy metals. LÄS MER

  4. 3. Chemical Processes at the Water-Manganite (γ-MnOOH) Interface

    Författare :Madeleine Ramstedt; Staffan Sjöberg; Per Persson; Lars Lövgren; Steven A. Banwart; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Inorganic chemistry; manganite; γ-MnOOH; mineral surface; acid-base properties; adsorption; Cd II ; N- phosphonomethyl glycine; glyphosate; PMG; surface complex; dissolution; disproportionation; XPS; EXAFS; infrared spectroscopy; SEM; AFM; potentiometry; electrophoresis; Oorganisk kemi; Inorganic chemistry; Oorganisk kemi; oorganisk kemi; Inorganic Chemistry;

    Sammanfattning : The chemistry of mineral surfaces is of great importance in many different areas including natural processes occurring in oceans, rivers, lakes and soils. Manganese (hydr)oxides are one important group to these natural processes, and the thermodynamically most stable trivalent manganese (hydr)oxide, manganit (γ-MnOOH), is studied in this thesis. LÄS MER

  5. 4. Electrostatic Interactions in Complex Liquids : A Thermodynamic Analysis Based on the Poisson-Boltzmann Equation and the Flexible Surface Model

    Författare :Ingemar Carlsson; Fysikalisk kemi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; AOT; AerosolOT; ionic surfactant; spontaneous curvature; bending modulus; bending energy; Helfrich curvature energy; fluid membrane; complex liquid; flexible surface model; micelle; counterion; Poisson-Boltzmann equation; cell model; L3 phase; sponge phas; Physical chemistry; Fysikalisk kemi;

    Sammanfattning : The aim of this study was to analyse physico-chemical properties of some complex liquids using the Poisson-Boltzmann (PB) cell model; to extend the theory to cover bilayer systems with complex global geometry; finally to apply this new extended model to such bilayer systems. The PB cell model provides a practical tool to examine counterion association and phase behaviour for structures of simple geometries; cylindrical and spherical. LÄS MER

  7. 5. Kinetic and thermodynamic modelling of ternary nanowire growth

    Författare :Egor Leshchenko; NanoLund: Centre for Nanoscience; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; III-V semiconductor materials; ternary nanowires; composition; crystal structure; modelling; Fysicumarkivet A:2021:Leshchenko;

    Sammanfattning : Among nanoscale structures of different shapes and dimensions nanowires are one of the most promising because of its truly unique properties different from their bulk counterparts. The energy quantization, perfect defect-free structure, and the possibility to grow them within the miscibility gap in combination with the benefits of bottom-up design and the possibility of integration on silicon substrates make nanowires ideal candidates for applications in optoelectronics, biotechnology and energy harvesting. LÄS MER