Article 75 physical chemistry 69 chemistry 65 controlled study 56 nonhuman 39 human 32 Quantum chemistry 30 unclassified drug 25 Humans 23 particle size 23 metabolism 22 pH 17 physical parameters 16 Animals 15 X ray diffraction 15 nanoparticle 15 animal 14 article 14 scanning electron microscopy 14 chemical composition 13 water 13 Fourier transform infrared spectroscopy 12 Particle Size 12 Temperature 12 drug delivery system 12 drug effect 12 procedures 12 temperature 12 Water 11 surface property 11