Matrix-based microparticle

Another encapsulation technique is to use matrix-based microparticles. The latter are of three main types [130] (i) Matrix powders where the active ingredient (a.i) is dispersed throughout the matrix and the mixture is ground (if necessary to form a pow-... 

Matrix Particles. Small particles based on a matrix can range in size from powders (microparticles) to granules (fine to macrogranules) to pellets (43). Microspheres can be considered as the matrix equivalent to microcapsules. Most controlled release granules are matrix-based, although some have a solid core or reservoir of pesticide (with a coating). 

In contrast, solid lipid microparticles consisting of a tripalmitin matrix and cationic lipids prepared using the micromixer-based solvent extraction process as described by Emi et al. [50] were of monomodal size, showing a narrow size distribution in the submicrometer range (Table 8.1). 

Figure 6. Merge, mix, split, and transport were the main manipulation steps used for on-chip droplet-based DNA purification. The system was able to extract genomic material from dilute raw cell samples by using the actuation of magnetic microparticles within the droplet using a matrix of coils [50],...

In other words, base-catalyzed microparticle synthesized in W/0 microemulsions results in the formation of relatively large matrix particles of low and even negligible porosity. Thus, in order to obtain porous microcapsules under base-catalyzed conditions, the two-step sol-gel polycondensation process must be employed, in which hydrolysis is first conducted under acidic conditions followed by condensation catalyzed by base. When this approach is adopted, mesoporous microspheres can be synthesized also in basic W/0 emulsions. In contrast, smaller particles synthesized in acid exhibit a strong microporous component (Figure 18.2). 

Fig. 1 Supramolecular systems described in this chapter. Top-. The extracellular matrix inspires most of the work and consists of fibers to resist tensile stresses such as collagens, fibers to resist compressive stresses such as the glycosaminoglycans, and soluble factors for cell signalling. Bottom Natural systems such as collagen, coiled-coil structures, p-sheet peptides such as peptide amphiphiles and multidomain peptides, hybrid systems such as streptavadin-biotin cross-linked microparticles, and synthetic systems such as the UPy-based hydrogelators...

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