A molecule of interest that is between 1 and 100 nanometers (nm) in diameter is often described as a nanoparticle or ultrafine molecule. In some circumstances, the term is used to describe larger particles up to 500 nm in size or filaments and cylinders that are less than 100 nm in only two directions. Metal particles with a diameter of less than 1 nm are commonly referred to as iota groups all things considered. Because of their smaller size, nanoparticles are typically distinguished from microparticles (1-1000 m), "fine particles" (measured between 100 and 2500 nm), and "coarse particles" (between 2500 and 10,000 nm). These differences include colloidal properties, ultrafast optical effects, and electric properties.
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