Nanoparticle
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A nanoparticle or ultrafine particle is a particle of matter 1 to 100 nanometres in diameter. The term is sometimes used for larger particles, up to 500 nm, or fibers and tubes that are less than 100
TEM (a, b, and c) images of prepared mesoporous silica nanoparticles with mean outer diameter: (a) 20nm, (b) 45nm, and (c) 80nm. SEM (d) image corresponding to (b). The insets are a high magnification of mesoporous silica particle.
Idealized model of a crystalline nanoparticle of platinum, about 2 nm in diameter, showing individual atoms.
Nanostars of vanadium(IV) oxide (VO2) exhibiting a crystal clusters structure resembling that of desert roses
1 kg of particles of 1 mm3 has the same surface area as 1 mg of particles of 1 nm3
Colloid
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A colloid is a mixture in which one substance, consisting of microscopically dispersed insoluble particles, is suspended throughout another substance. Some definitions specify that the particles must
Nanoparticle
…nm), and "coarse particles" (ranging from 2500 to 10,000 nm), because their smaller size drives very different physical or chemical properties, like colloidal properties and ultrafast optical effects or electric properties. Being more subject to the Brownian motion, they usually do not sediment, like colloidal…
Scanning electron microscope image of a colloid
Colloidal silica gel with light opalescence
A dollop of hair gel
Creams are semi-solid emulsions of oil and water. Oil-in-water creams are used for cosmetic purpose while water-in-oil creams for medicinal purpose