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Self-exploding polyelectrolyte-coated gel beads releasing micrometer-sized capsules at the time of explosion consist of degradable hydrogel beads loaded with 3 µm sized layer-by-layer (LbL) microcapsules. When the polyelectrolyte coated gel beads explode, the smaller LbL microcapsules are suddenly released.
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Geest et al. (2008) studied this question.
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