I want to know how to calculate the concentration of a commercially available colloidal TiO2 (Ti-Nanoxide HT from Solaronix, Cat. No. 11711) for quenching studies. As it contains an organic binder, the calculation of M.Wt seems to be difficult. And I don't know how will be the extinction coefficient of the Ti-Nanoxide in presence of the binder. Can any one suggest some solution?
Heating at high temperature may not remove all the binder molecules. So I can't sure about whether the resulting TiO2 is completely free from the binder or not as I don't know anything about the properties of the binder such as its boiling point, structure, etc.,
Yeah you are right. Thank you for your valuable suggestion Luc Emile Brunet. Let me try this.
This is not a solution but rather a colloid of TiO2 particles, so I am not sure what you will mean by concentration? You might really be more interested in the number of particles of TiO2 per litre or the surface area of those particles.
If you are simply interested in a rough estimate of the TiO2 you might be able to us UV spectra to check if the concentration is changing with time and if not refer to the product speciation for the weight of TiO2 per litre.
The binder may effect your quenching studies, do you know what the binder is? Does its structure suggest it can quench your sensitiser? Or will it effect the way in which your sensitiser interacts with the TiO2?
Thanks James
I don't know about the organic binder. It should be an organic polymer like PVA.
If you are using Ruthenium bipyridine complexes they are unlikely to be strongly quenched by PVA.
They should be ok unless the PVA caused them to aggregate. The uv/vis spectrum will show you if they aggregate.
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