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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 .
Sols are stable, so that they do not settle down when left undisturbed, and exhibit the Tyndall effect, which is the scattering of light by the particles in the colloid. The size of the particles can vary from 1 nm - 100 nm. Examples include amongst others blood, pigmented ink, cell fluids, paint, antacids and mud.
Pages for logged out editors learn more. ... Download as PDF; Printable version; ... Pages in category "Colloids" The following 29 pages are in this category, out of ...
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.
For example, if the particles had a diameter of 10 μm the sedimentation length would be 5.92×10 −4 μm, one order of magnitude smaller than for polyethylene particles. Also, because the particles are more dense than water, l g {\displaystyle l_{g}} is positive and the particles will sediment.
Photographic emulsion is a fine suspension of insoluble light-sensitive crystals in a colloid sol, usually consisting of gelatin. The light-sensitive component is one or a mixture of silver halides: silver bromide, chloride and iodide. The gelatin is used as a permeable binder, allowing processing agents (e.g., developer, fixer, toners, etc ...
Colloid cysts are most effectively removed through a craniotomy, where part of the skull is removed to access the brain. It is a rare kind of brain tumour but one which is fortunately benign, ...
When heavy metals or radionuclides form their own pure colloids, the term "Eigencolloid" is used to designate pure phases, e.g., Tc(OH) 4, Th(OH) 4, U(OH) 4, Am(OH) 3. Colloids have been suspected for the long range transport of plutonium on the Nevada Nuclear Test Site. They have been the subject of detailed studies for many years.
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