Sökning: "Keggin"

Hittade 5 avhandlingar innehållade ordet Keggin.

1. 1. Equilibrium and structure studies of aqueous vanadophosphates and molybdovanadophosphates

   Författare :Anna Selling; Lage Pettersson; Atsushi Yagasaki; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Molybdovanadophosphate; vanadophosphate; molybdate; vanadate; phosphate; heteropolyanions; Keggin; redox; equilibria; potentiometry; NMR 31P; 51V ; ESR;

   Sammanfattning : .... LÄS MER

3. 2. Crystal structure studies of a new series of molybdovanadate polyanions and some related vanadates

   Författare :Arne Björnberg; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; isopolyvanadates; molybdovanadate polyanions; single-crystal X-ray investigations; ESR spectroscopy; heteropoly blues;

   Sammanfattning : The determination of complexes formed in weakly acidic aqueous solutions containing pentavalent vanadium as well as hexavalent molybdenum has proved diffi cui t due to slow equilibria and 1 imi ted sol ubi 1 i ty of especially the vanadium species. The formation of several different polynuclear complexes with a very varied molybdenum/vanadium ratio also complicates the interpretation of Potentiometrie data. LÄS MER

4. 3. Thermodynamic modelling of aqueous solutions and applications in some functional materials synthesis

   Författare :Mingsheng Wang; KTH; []
   Nyckelord :;

   Sammanfattning : Modern advances in science and technology require thedevelopment of functional materials with improved performance.Such engineered materials often have a very complex compositionand specific microstructures. These factors impose a seriouschallenge for the synthesis and processing of advancedfunctional materials. LÄS MER

5. 4. Tungsten-Based Nanocomposites by Chemical Methods

   Författare :Sverker Wahlberg; Muhammet S. Toprak; Håkan Engqvist; FNM Funktionella material KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Sammanfattning : Tungsten based-materials find use in many different fields of engineering, particularly in applications where good temperature and/or erosion resistance is important. Nanostructuring of tungsten composites is expected to dramatically improve the materials’ properties and enhancing the performance in present applications but also enabling totally new possibilities. LÄS MER

7. 5. Nanostructured Tungsten Materials by Chemical Methods

   Författare :Sverker Wahlberg; Mamoun Muhammed; Håkan Engqvist; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : Tungsten based-materials are used in many different technical fields, particularly in applications requiring good temperature and/or erosion resistance. Nanostructuring of tungsten alloys and composites has the potential to dramatically improve the materials’ properties, enhancing the performance in present applications or enabling totally new possibilities. LÄS MER