Nanoparticles xa mus rau cov khoom uas muaj qhov me me ntawm 1-100nm (nanoparticles kuj hu ua ultrafine particles). Nws belongs rau qeb ntawm colloidal particle loj. Lawv nyob hauv thaj chaw hloov pauv ntawm cov atomic pawg thiab cov khoom macroscopic, nruab nrab ntawm cov tshuab microscopic thiab macroscopic systems, thiab yog cov pab pawg tsim los ntawm cov atoms lossis molecules me me, yog li lawv tsis yog cov tshuab microscopic lossis cov tshuab macroscopic.
