Pigments & Inks
Basically, inks are suspensions containing pigments as disperse and liquids as the continuous phase. One of the challenges is to stabilize these suspensions. The most important parameters regarding stability are the viscosity of the liquid and particle size distribution of pigments. Additionally, surface-active additives are used which could be characterized via zeta potential experiments. For the industrial application of inks it is very important to know the viscosity at the condition right on the nozzle of the printing head at very high shear rates (up to 50,000 1/sec). Finally yet importantly, the drying behavior on different substrates can be of high interest for the control of ink quality.