**4.1 Effect of initial composition**

**Figure 7** shows the phase separation patterns with different initial average concentrations during time steps 200, without considering the fluid flow. It has been suggested that there are two phases, namely, B and C, in the evaluated microstructures. In **Figure 7** the red region and blue region show the B-rich and C-rich phase, respectively. The volume fraction of the C phase has been shown in **Figure 7**. As we can see, when the volume fraction of the B and C phases is around 0.7 and 0.3, respectively, droplet-like structure has been formed (**Figure 7(a)**). When the volume fraction of the C phase increases from 0.3 to 0.4, an interconnected structure will form at the initial stage (**Figure 7(c)**). **Figure 7(e)** shows the equal volume fraction of both initial average concentrations with 0.5. It has been shown that at equal initial average concentration, spinodal- or interconnected-type microstructure has grown completely. **Figure 7(f–i)** shows the spinodal or interconnected to droplet-like microstructures, when it is subjected to increasing the initial average concentration of phase C from 0.5 to 0.7.
