Dear colleagues,
I made aggregates composed of TiO2 and Carbon Black particles (aggregate diameter : 1-10 µm), and i was wondering how the stability of these aggregates in water (e.g. the fact particles will not dissociate easily) can be characterized ?
- XPS analysis has already been made, showing no new chemical bonds while trying to associate TiO2 and Carbon particles.
I'm looking for "adhesive forces" characterization techniques, or in the worst case, for empirical experiments which would help to highlight (or not) the stability of these aggregates in water.
Regards,
Enrique
The most simple way of performing stability test is simply by putting very harsh conditions for your system, let's say sonicating or agitating your agregates at a certaing concentration that you consider of interest. Then you leave it for a relative long time, let's say a week and analize the final product. If there is no electronic comunication, then you have to look only at the microstructure, then do SEM analysis to see morphological changes, also you can perform a powder pattern and model microstructure before and after the test.
Adhesion between water and materials can be be investigated by sedimentation rate. XPS and XRD can give you information about the new formed material.
Enrique Ribeiro
Take a look at this webinar for some ideas:
Adhesion and cohesion http://tinyurl.com/zwb2wlh
You may characterize it by degree of segregation (TiO2 via carbon black) as function of dispersing intensity.
Density of titania is about double that of carbon black, so in case of breaking the aggregates/agglomerates it will be enriched in lower sediment layers. You may quantify this by X-ray absorbance which is much more sensitive towards titania.
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