We present a multifunction spectrophotometer for the measurement of light reflection from thick and transmission from very thin turbid liquid samples. Moreover, we present a method to get the complex refractive index of such turbid liquids. As an example of the high performance of the device and the method, we present data on inks that are used in offset printing.
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Highlights Determination of complex refractive index of CNCs as a function of wavelength The data analysis is based on Beer-Lambert and immersion liquid method equations The refractive indexes of CNCs are considerably lower than original cellulose The method is independent of the shape or size of a particle The accuracy of the refractive index was better than ±0.005 refractive index units
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