*4.1.3 Microvascular system*

 To overcome the limitation of hollow fiber containers, microvascular networks have been introduced and developed by White et al. [ 40 , 41 ] which are similar to the biological vascular system. In this method, the microvascular networks can repair the damaged area autonomously. Thanks to the small diameter of the microvascular, only the vascular in the damaged area will discharge the healing agent when damage occurs and the rest of the containers will remain intact. **Figure 10** shows a schematic of a microvascular network for self-healing applications. Although this method can increase the number of healing cycles, the fabrication process of such a microvascular

 **Figure 10.**

 *A schematic of a microvascular network for self-healing application [ 41 ].* 

network is complex and it is hard to achieve synthetic materials with such properties for practical applications.
