NMR characterization of dispersant-particle interactions in the colloidal dispersions

The understanding of stabilization mechanisms in colloidal dispersions is of great importance in many application fields. Analytical tools to provide direct insight into stabilization mechanisms in in-situ conditions are in high demand. Approaches and techniques based on solution state NMR are – in principle – well suited to study such systems. We are examining the potential of such approach to probe in-situ the interactions between sodium dodecylsulphate (SDS) and quinacridone pigment particles of 70 nm diameter. This model system was chosen as a prelude to the exploration of pigment dispersions that will involve more complex surfactant molecules and formulations. In this contribution we present preliminary results of this investigation.