Search for dissertations about: "quaternary ammonium salts"

Showing result 1 - 5 of 7 swedish dissertations containing the words quaternary ammonium salts.

  2. 1. Cellulose in Quaternary Ammonium-based Solvents: Dissolution, Modification and Coagulation

    Author : Shirin Naserifar; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; gelation; etherification; quaternary ammonium hydroxides; cellulose; dissolution;

    Abstract : Processing cellulose through dissolution and regeneration is essential for many applications, yet challenges are posed because it does not readily melt or dissolve in commonly used aqueous and organic solvents. Consequently, extensive efforts have been devoted to developing novel and efficient solvents for cellulose, as well as exploring new functionalization routes. READ MORE

  4. 2. The Use of Aliquat-336 in a Partitioning and Transmutation Process and a Kinetic Study of the Oxidation of U(IV) to U(VI)

    Author : Anders Landgren; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; partitioning; quaternary ammonium salts; transmutation; hydrolysis; Aliquat-336; liquid-liquid extraction; kinetics; oxidation; uranium IV ;

    Abstract : Spent nuclear fuel contains several long-lived radionuclides that must be stored in a safe manner for a long time. Transmutation of these radionuclides into short-lived or stable nuclides reduces the necessary storage time by several orders of magnitude. The nuclides most suitable for transmutation are those of the actinides. READ MORE

  5. 3. Nanocelluloses - surface modification and use in functional materials

    Author : Michaela Salajková; Lars Berglund; Gunnar Westman; Anna Finne; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Nanocellulose; surfactant; surface modification; papermaking process; quaternary ammonium salt;

    Abstract : Cellulose nanocomposites offer interesting potential in terms of improved properties and new functionalities compared with microcomposites. Preparation from colloidal suspensions is promising, since high reinforcement content is possible and a wide range of constituents can be used. READ MORE

  6. 4. Adsorption and Self-Assembly of Cationic Surfactants at Silica Surfaces

    Author : Cecilia Ström; Fysikalisk kemi; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Physical chemistry; Fysikalisk kemi;

    Abstract : The equilibrium self-assembly of cationic surfactants in bulk solution and at negatively-charged silica substrates is investigated experimentally and theoretically. The surfactants used are quaternary ammonium salts, both monovalent (DoTAB, TTAB, CTAB) and divalent (DoPPDAC). READ MORE

  7. 5. Ion Solvation in Critical Binary Aqueous Solvents Probed by Advanced Synchrotron-Based Techniques

    Author : Monika Witala; Göteborgs universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; preferential ion solvation; microscopic segregation of hydrophilic ions; ion size asymmetry; critical binary liquid mixtures; 2; 6-dimethylpyridine; potassium chloride; grazing-incidence x-ray fluorescence; small-angle x-ray scattering; mesoscale ordering; x-ray beam-induced local heating;

    Abstract : The Poisson-Boltzmann equation is the standard tool for studying the electrostatic interactions in electrolyte solutions, although it neglects e.g. the ion size and ion-ion correlations. Even experimentally observed specific ion effects cannot be explained in a view of this approximation. READ MORE