High core-content microcapsules

In order to obtain microcapsules with the high solid content, a ternary solution with high concentration of the shell polymer and the core material should be chosen. 

Core/wall ratio cannot only decide the wall thickness of a microcapsule but also the effectiveness of the microencapsulation." The work" on the microencapsulation of xylitol by poly (urethane-urea), which was performed in a water-in-oil system, indicates that the most proper core/wall ratio is 77/23 in terms of high encapsulation yield and xylitol loading content. Another work on the microencapsulation of perfume by polyurea, which was performed in a oil-in-water system, found that with the decrease of the core/wall ratio, the size of the formed microcapsule increased even the original droplet size is roughly the same. An outward diffusion mechanism was proposed to explain... 

To produce microgels that have a very large pore structure with a high internal fluid content, one can utilize cross-junctions in the microfluidics to encapsulate quantum dot metal cores into a hydrogel microcapsule with size distributions typically within 5 %. Using such techniques, it is possible to obtain microgel particles in the size range of 10-1,000 pm [3]. 

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