= Nanotechnology
{wiki}
<Nanotechnology> studies and controls matter whose important dimensions are on the <nanoscale>, conventionally about $1$–$100$ <nanometres>. A <nanometre> is $10^{-9}$ <metres>. The scientific interest comes from changes in behaviour at these dimensions, including the increasing role of <surfaces> and, in suitable systems, <quantum confinement>.<About Nanotechnology by the National Nanotechnology Coordination Office>[Definition and How Small Is Nano]{ref}
For example, subdividing a fixed <volume> into smaller <nanoparticles> increases the exposed <surface area>, changing how much material can participate in a <surface> reaction. <Nanostructures> can also alter <electrical conductivity>, interaction with <light> and mechanical properties by controlling geometry rather than changing only chemical <chemical composition>. Useful <nanotechnology> therefore combines fabrication with measurements of structure and properties, such as <electron microscopy> or <atomic force microscopy>.<What Is So Special about Nano? by the National Nanotechnology Coordination Office>[Scale at which surface behavior plays a larger role]{ref}
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