The document discusses the use of nanoparticles for drug delivery. It notes that nanoparticles have advantages over traditional tablets and suspensions for drug delivery due to their small size, which allows for greater bioavailability and targeting of specific tissues. The size of nanoparticles is important as it influences dissolution rate and can allow particles to cross cell membranes if small enough. The document then covers various methods for creating nanoparticles, including top-down size reduction techniques and bottom-up assembly approaches. It also discusses how particle sizing instruments like dynamic light scattering and laser diffraction can be used to characterize nanoparticles and ensure batches meet the necessary specifications for drug delivery.