Particle size 122 particle size 99 Particle swarm optimization (PSO) 87 Particle size analysis 79 Article 77 controlled study 57 chemistry 47 Nanoparticles 44 nonhuman 42 Particle Size 41 human 39 Particle swarm optimization 35 Particle beams 28 particle swarm optimization 28 article 27 Humans 26 nanoparticle 26 procedures 26 Morphology 25 Particles (particulate matter) 25 Scanning electron microscopy 25 X ray diffraction 25 Monte Carlo methods 24 Fourier transform infrared spectroscopy 22 drug delivery system 21 unclassified drug 21 Particles sizes 20 Photons 20 Animals 19 male 19