Search for dissertations about: "Dan Sandström"

Found 3 swedish dissertations containing the words Dan Sandström.

2. 1. Dipolar recoupling sequences in 13C and 31P nuclear magnetic resonance studies of mineral surfaces

   Author : Dan Sandström; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Chemistry of Interfaces; Gränsytors kemi;

   Abstract : Solid state magic angle spinning (MAS) 31P nuclear magnetic resonance (NMR) experiments, both cross polarization (CP) and dipole-dipole recoupling, were used as tools in the investigation of the reaction products at the surface of synthetic galena (PbS) mineral and O,O'-dialkyldithiophosphate potassium salts. Various dipole-dipole recoupling sequences have been tested on powder glycine-13C2 NMR and a polycrystalline powder sample of O,O'-diethyldithiophosphate2-Ni(II) to find one or several sequences suitable for the surface experiments. READ MORE

4. 2. Solid state nuclear magnetic resonance studies of synthetic mineral surfaces

   Author : Dan Sandström; Luleå tekniska universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Chemistry of Interfaces; Gränsytors kemi;

   Abstract : Solid state 1H, 31P and 27Al Magic Angle Spinning (MAS) Nuclear Magnetic Resonance (NMR) was used in studies of surface species formed on a synthetic fluorapatite in aqueous suspensions at different pH with or without ions or ion complexes of iron or aluminium in the suspension. Different sites related to the PO43- ions at the mineral surface were suggested, POx, POxH and POxH2. READ MORE

5. 3. Structural and solid state EMF studies of phases in the CaO–K2O–P2O5 system with relevance for biomass combustion

   Author : Malin Sandström; Dan Boström; Anders Nordin; Bo Björkman; Umeå universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; calcium potassium phosphates; structural studies; Gibbs standard energy of formation; EMF measurements; biomass; combustion; chemical equilibrium model calculations; Inorganic chemistry; Oorganisk kemi;

   Abstract : Fosfaters reaktioner i energiomvandlingsprocesser är kritisk för den generella processen som helhet, för askrelaterade problem, emissioner liksom för en effektiv och hållbar användning av askan.Denna avhandling är en sammanställning och diskussion med utgångspunkt i åtta artiklar som behandlar strukturella och termodynamiska studier på faser i CaO-K2O-P2O5-systemet, vilka är av relevans inom förbränning av biomassa. READ MORE