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Stable ▫$TiO_2$▫ dispersions for nanocoatings preparation [Elektronski vir]
Veronovski, Nika ...
In this research the preparation and characterization of titanium (TiO2) coated self-cleaning cellulose materials starting from TiO2 P25 powder (Degussa, Germany) was studied. The aim of the research ...was to decrease high aggregation of TiO2 P25 nanoparticles, using surfactant species as dispersant and/or stabilisers (considering the balance between repulsive and attractive forces), in view of the fact that TiO2 nanoparticles, when optimally separatedinto smaller particles populations, present the best properties in the system they are used in (coatings) in. For this purpose cationic Alkanediyl-?,?-bis-N-dodecyl-N, N'-dimethyl-ammonium bromide (Gemini) and anionic Sodium dodecyl sulphate (SDS) surfactants were applied, with concentrations under their CMSs. Size and zeta-potential characterization of stable colloidal dispersions were performed. For stable 0.5, 2.5 and 5.0 mg/mL TiO2 dispersions in the presence of 250 * 10- 6 mol/L Gemini surfactant (zeta-potential ~ 40 mV) only two scattering populations were determined, at 78-95 nm and at ~ 280 nm. As a proof of stabilized TiO2 P25-surfactant colloidal dispersions uniform coatings were obtained, generatedat the fibres surfaces, which were analyzed by Scanning electron microscopy (SEM). With the usage of proper amounts of surfactants, homogeneousthin TiO2 coatings were formed. Superior dense coatings on the fibres surfaces were formed after treatment in 5.0 mg/mL aqueous TiO2 P25 dispersions, in the presence of 250 * 10- 6 mol/L Gemini surfactant in 5.0 * 10- 3 mol/L KBr at 25 °C. In addition to that, self-cleaning test was performed. Higher photocatalytic activity was determined for samples with denser coatings. Fibres with thin coatings had the lack of phototocataytic activity.
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