Search for dissertations about: "carboxylates"

Showing result 1 - 5 of 25 swedish dissertations containing the word carboxylates.

  2. 1. Surface chemistry of Al and Si (hydr)oxides, with emphasis on nano-sized gibbsite (α-Al(OH)3)

    Author : Jörgen Rosenqvist; Umeå universitet; []
    Keywords : Gibbsite; silica; kaolinite; surface complexation; protonation; adsorption; carboxylates; modeling; AFM; IR; XPS;

    Abstract : This thesis contains an introduction to the surface chemistry of minerals in aqueous environment, and a summary of five manuscripts concerning adsorption reactions at the surfaces of nano-sized gibbsite (α-Al(OH)3), amorphous silica and kaolinite. Nano-sized gibbsite was synthesized and thoroughly characterized using X-ray diffraction, high-resolution transmission electron microscopy, atomic force microscopy and Fourier transform infrared spectroscopy. READ MORE

  4. 2. Contribution of polyfluoroalkyl phosphate esters (PAPs) and other precursor compounds to perfluoroalkyl carboxylates (PFCAs) in humans and the environment

    Author : Ulrika Eriksson; Anna Kärrman; Bert van Bavel; Gunilla Lindström; Jonathan Martin; Örebro universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; PAPs; precursors; PFCA; exposure; indoor dust; human serum; WWTP; bird eggs; Chemistry; Kemi;

    Abstract : Per-and polyfluoroalkyl substances (PFAS) are anthropogenic compounds that have been spread all over the world. The use of fluorotelomer compounds, short-chained homologues, and other PFASs with perfluorinated moieties has emerged recent years. READ MORE

  5. 3. Hydrogen Bonded Phenols as Models for Redox-Active Tyrosines in Enzymes

    Author : Josefin Utas; Björn Åkermark; Helena Grennberg; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; electron transfer; photosystem II; radicals; imidazole; hydrogen bonding; Organic chemistry; Organisk kemi;

    Abstract : This thesis deals with the impact of hydrogen bonding on the properties of phenols. The possibility for tyrosine to form hydrogen bonds to other amino acids has been found to be important for its function as an electron transfer mediator in a number of important redox enzymes. READ MORE

  6. 4. Quantified In Situ Analysis of Initial Atmospheric Corrosion : Surface heterogeneity, galvanic effects and corrosion product distribution on zinc, brass and Galvalume

    Author : Ping Qiu; Christofer Leygraf; Béatrice Hannoyer; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Atmospheric corrosion; Zinc; Brass; Galvalume; In Situ; Quantification.; Materials science; Teknisk materialvetenskap;

    Abstract : The interaction of the surface of a pure metal or an alloy with the surrounding atmosphere occurs in a highly complex interfacial regime. During atmospheric corrosion this interfacial regime involves the metal surface, often covered by a naturally formed oxide layer of a few nanometers thickness; an aqueous adlayer, typically with a thickness of a few to a few tens of nanometers, and the atmosphere from which airborne particles, oxygen, and gaseous pollutants dissolve into the adlayer and influence the atmospheric corrosion process. READ MORE

  7. 5. Molecular perspectives on goethite dissolution in the presence of oxalate and desferrioxamine-B

    Author : Anna A. Simanova; John Loring; Owen Duckworth; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Chemistry; Kemi;

    Abstract : Iron, an essential nutrient, is primarily present in soils in the form of iron-bearing minerals characterized with low solubilities. Under iron deficient conditions, some plants and microorganisms exude a mixture of iron-complexing agents, including carboxylates and siderophores, that can cause minerals to dissolve and increase iron solubility. READ MORE