ANYL 138 |
| Titanium dioxide (TiO2) is commonly used in building and construction applications as a pigment or filler for organic coatings to improve appearance or mechanical properties. However, the incorporation of TiO2 pigment in coatings has been shown to reduce the service life of coatings, due to its natural reaction with ultraviolet light. A common way to reduce this problem is to encapsulate the TiO2 with metal oxides. Development of new pigments is slowed because there is no simple, inexpensive way to measure their relative reactivity. Spectrophotometric assays show promise as a reliable method of ranking pigment reactivity. In this study, three assay methods are used to test the photoreactivity of an array of TiO2 pigments of different crystal phase, particle size, and metal oxide encapsulant. The three methods are: reduction of methyl viologen, peroxide measurements with leuco-crystal violet, and peroxytitanic acid. The assay results are compared to standard industrial tests. |
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General Papers
7:00 PM-9:00 PM, Sunday, 28 August 2005 Washington DC Convention Center -- Hall A, Poster
Division of Analytical Chemistry |