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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 be dispersed in a liquid , [ 1 ] while others extend the definition to include substances like aerosols and gels .
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Examples include amongst others blood, pigmented ink, cell fluids, paint, antacids and mud. Artificial sols can be prepared by two main methods: dispersion and condensation. In the dispersion method, solid particles are reduced to colloidal dimensions through techniques such as ball milling and Bredig's arc method .
Unlike solutions and colloids, if left undisturbed for a prolonged period of time, the suspended particles will settle out of the mixture. Although suspensions are relatively simple to distinguish from solutions and colloids, it may be difficult to distinguish solutions from colloids since the particles dispersed in the medium may be too small ...
A colloidal crystal is an ordered array of colloidal particles and fine grained materials analogous to a standard crystal whose repeating subunits are atoms or molecules. [1] A natural example of this phenomenon can be found in the gem opal, where spheres of silica assume a close-packed locally periodic structure under moderate compression.
Lady Gaga made a debut as an extra in music video for AC/DC in New York City. Gaga can be seen dancing and shaking her head. [60] "Magnetic Baby" 2007 Semi Precious Weapons: Pamela Romanowsky: Original version of "Magnetic Baby". The video shows Gaga as a brunette pouring alcohol on a member of the band, and then kissing him and dancing. [61]
Colloids are formed by phase separation, though not all phase separations forms colloids - for example oil and water can form separated layers under gravity rather than remaining as microscopic droplets in suspension. A common form of spontaneous phase separation is termed spinodal decomposition; it is described by the Cahn–Hilliard equation.
The accompanying music video was directed by filmmaker Robert Rodriguez, and features Gaga and Grande dancing inside a giant arena during a rainstorm, with daggers falling from the sky. "Rain on Me" was nominated for seven MTV Video Music Awards, winning for Song of the Year and two more other awards while being nominated for Video of the Year.