Applications of nanoparticles in combating COVID-19 Researchers review the various properties and use of nanoparticles in targeting SARS-CoV-2 and how they could be used to develop new therapeutics and diagnostics for SARS-CoV-2. Nanoparticles, materials with a size less than 100 nm, have been used widely in many applications. Their small size makes their surface to volume ratio large, which has been used advantageously. Nanoparticles have been made from a wide variety of materials, including inorganic, metals, and organic materials. The use of nanoparticles in pharmaceutical applications has many benefits. These materials can improve drug solubility, controlled drug release, and targeting of specific cells. In addition, they show efficient adsorption of many types of biomolecules and other chemicals, and can be used both for therapy and diagnostics. In a recently published review in