Structural relaxation time correspondence

Nevertlieless the sketched picture provides the most basic view of a glass transition in colloidal suspensions, connecting it with the increase of the structural relaxation time T. Increased density or interactions cause a slowing down of particle rearrangements which leave the HI relatively unaffected, as these solvent mediated forces act on all time scales. Potential forces dominate the slowest particle rearrangements because vitrification corresponds to the limit where they actually prevent the final relaxation of the microstructure. The structural relaxation time T diverges at the glass transition, while stays finite. Thus close to arrest a time scale separation is possible, T T . 

The structural relaxation time T4 (the indices have been chosen for correspondence with previous results) decrease with rising concentration from 25 ms (70 mM) to 0.2 ms (300 mM) and the short time constant T3 decrease from 0.35 ms (70 mM) to 0.1 ms (250 mM). Therefore, they correspond well with the time constants determined hy dynamic electric hirefringence measurements. 

Films in the MROL phase also showed slower dynamics, as indicated by values of the structural relaxation time Tmrol 4-5 times longer than the OL phase, corresponding to a shift in Tg of 4 K (Fig. 10.2d). This finding is in line with the quantitative predictions proposed both for Lennard-lones liquids [6], and for model polymeric systems [17]. However, Tmrol decreases continuously upon cooling, until the bulk value is fully recovered, and it remains unchanged upon following cooling. 

Table 7 shows results obtained when data were fit to Cross model,. The upper Newtonian plateau was, as usually, inaccessible. Structural relaxation times, , showed that hydrated polysaccharides constituted a network which relaxed after attainment of its corresponding onset value. 

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