The densimetric measurements were performed using a DMA 4100 M density meter (Anton Paar, Graz, Austria). The samples were diluted/dissolved using ultrapure water (H 2 O) and the density of each sample was measured from 5 °C to 55 °C. For the estimation of the scattering length densities (SLD) in solution and to calculate the volume fraction, densities obtained at 25°C were used.