The photocatalytic activity of a nano-anatase-containing paint has been studied. It was found that after a certain period of initial UV irradiation, the photocatalytic activity of such a paint significantly increases. To understand the underlying mechanisms, the pigment volume concentrations (PVCs)were varied in different ways, e.g. by varying the content of the inorganic filler, or by adjusting the content of the polymeric binder. The results were compared with the photocatalytic activity of a commercially available paint. The formulations which exhibit a good compromise between photocatalytic activity and other essential paint properties are discussed. The effect of relative humidity on the photocatalytic activity was also measured and is commented upon.
COBISS.SI-ID: 1817447
A model organic pigment (β copper phthalocyanine) was encapsulated by silica using water glass as a precursor. It is shown that the thickness, porosity and uniformity of silica shells (coatings) around individual pigment particles depend significantly on pH and temperature of synthesis. It is further demonstrated that the obtained silica shells can serve as an efficient protection against the highly reactive products of photocatalysis. The degree of protection depends not only on the thickness of silica shells but also on their porosity.
COBISS.SI-ID: 1856615