Sökning: "Gränsytors kemi"
Visar resultat 16 - 20 av 57 avhandlingar innehållade orden Gränsytors kemi.
16. Characterisation and surface reactions of iron oxides and fluorapatite in aqueous suspensions
Sammanfattning : The final objective of this study is to produce chemical models of flotation- like systems, including oxidation products of magnetite (maghemite and hematite) together with apatite. This is started by investigating the acid base properties, surface complexation and surface characteristics of the systems hematite-H+ and maghemite-H+ (paper I), fluorapatite-OH- (paper II) and a mixed system of maghemite-fluorapatite-OH- (paper III). LÄS MER
17. Surface reactions in aqueous suspensions of fluorapatite and iron oxides
Sammanfattning : The main objectives have been to study and model surface reactions of aqueous suspen-sions of minerals with relevance to the dephosphorization of iron oxides by reverse froth flotation. Synthetic hematite, maghemite and fluorapatite in colloidal forms were prepared and thoroughly characterized using XRD, SEM, BET, FT-IR and FT-Raman. LÄS MER
18. Solid state 29Si and 27Al magic angle spinning NMR studies of mechanochemically modified cement
Sammanfattning : Solid state 29Si and 27Al magic angle spinning (MAS) NMR spectroscopy has been used to investigate how mechanochemical modification affects the hydration kinetics, as well as the structural and chemical properties, in cement blends. The modification comprises intensive treatment of rapid hardening Portland cement with condensed silica fume additive in a vibrating grinding mill. LÄS MER
19. Spectroscopic studies of kaolinite surfaces
Sammanfattning : In this thesis, specific surface reactions on kaolinite have been investigated. The methods used are diffuse reflectance Fourier transform (DRIFT), FT-Raman and micro Raman spectroscopy. The deuterium exchange of the hydroxyl protons of kaolinite has been studied. LÄS MER
20. Surface reactions on Kaolinite studied by FT-spectroscopy
Sammanfattning : .... LÄS MER
