The unprecedented simultaneous accessibility of the low and high Q region available on NIMROD allows to tackle the issue of ageing of colloidal systems from the point of view of the microscopic structure. We propose to study two Laponite-water suspensions, which undergo dynamical arrest as a gel or a glass, depending on concentration, and attempt addressing questions about the microscopic mechanism and interactions with the solvent, driving the gel or glass transition: What is the role of the water-laponite correlations in the gelation/glassification process? How do these change upon ageing and by changing concentration? There is a difference between the microscopic structure of water in the gel and glassy phase? If Laponite forms a percolating network upon gelation, what is the relation of this network with that of water H-bonds?The total beam time required is 4 days.