A method for the detection of the refractive index of irregular shape solid pigments in light absorbing liquid matrix.
The immersion liquid method is powerful for the measurement of the refractive index of solid particles in a liquid matrix. However, this method applies best for cases when the liquid matrix is transparent. A problem is usually how to assess the refractive index of a pigment when it is in a colored host liquid. In this article we introduce a method, and show that by combining so-called multifunction spectrophotometer, immersion liquid method and detection of light transmission and reflection we can assess the refractive index of a pigment in a colored liquid, and also the extinction or absorption coefficient of the host liquid.
Niskanen
Ilpo
I
Measurement and Sensor Laboratory, University of Oulu, Technology Park 127, Kajaani, Finland. ilpo.niskanen@oulu.fi
Räty
Jukka
J
Peiponen
Kai-Erik
KE