Fig. 1. Schematic diagram of the experimental setup. TC, temperature controller.

Fig. 2. Amplitude power spectra of the singly backscattered light from suspension of particle with radius R=230  nm, ϕ=0.1, and L=40  μm, at T=281  K and T=292  K, respectively. Lines represent the Lorentzian fitting of the experimental data. Center frequency is shifted from 2 kHz to 0 Hz.

Fig. 3. Effective viscosity as a function of temperature T in colloidal suspensions. Solid line corresponds to Eq. (6).

Fig. 4. Effective viscosity as a function of the volume fraction ϕ in colloidal suspensions. Solid triangles, experimental results by low-coherence FODLS. Solid line corresponds to Eq. (6). Dashed line corresponds to Einstein’s equation.