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(a) Chemical structure of Pc4 and (b) schematic diagram of Pc4 containing silica nanoparticles (Pc4SNP). (c) TEM images of Pc4SNP. (d) DLS determination of particle size and distribution of Pc4SNP. The number (%) in the Y axis represents the percent of mean number of nanoparticles while the X axis represents the size of the particles.
