Light Scattering techniques
Light scattering techniques are a must-have in a colloidal tool box.
Light interacts with matter and reveals through the scattered intensity in different angles information about both structure and dynamics of the material studied. Frequently asked questions are: How large are the particles? Do the particles aggregate? What is the molecular weight of the polymer and how broad is the size distribution?
We use both dynamic and static light scattering and recently we have had good experience using Diffusion Wave Spectroscopy, DWS. In the latter project the question in focus was if the material structured itself as a network and if this network could be easily broken and restructured. Normally, this is a question that implies a study with a rheometer. Here, due to the sensitivity of the sample, DWS was the much better choice of instrumentation.