colloid (redirected from Colloidal synthesis)

colloid /col·loid/ (kol´oid)

1. glutinous or resembling glue.

2. a chemical system composed of a continuous medium (continuous phase) throughout which are distributed small particles, 1 to 1000 nm in size (disperse phase), that do not settle out under the influence of gravity; the particles may be in emulsion or in suspension. The term may be used to denote either the particles or the entire system.colloid´al

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dispersion colloid  colloid (2), sometimes specifically an unstable colloid system.

emulsion colloid 

1. lyophilic c.

2. rarely, emulsion.

lyophilic colloid  a colloid system in which the disperse phase is relatively liquid, usually comprising highly complex organic substances such as starch, which readily absorb solvent, swell, and distribute uniformly through the medium.

lyophobic colloid  an unstable colloid system in which the disperse phase particles tend to repel liquids, are easily precipitated, and cannot be redispersed with additional solvent.

stannous sulfur colloid  a sulfur colloid containing stannous ions; complexed with technetium 99m it is used in bone, liver, and spleen imaging.

suspension colloid  lyophobic c.

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col·loid (kloid)

n.

1. A suspension of finely divided particles in a continuous medium from which the particles do not settle out rapidly and are not readily filtered.

2. The particulate matter so suspended.

3. The gelatinous stored secretion of the thyroid gland, consisting mainly of thyroglobulin.

4. Gelatinous material resulting from colloid degeneration in diseased tissue. Also called colloidin.

adj.

Of, relating to, containing, or having the nature of a colloid.

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col·loidal (k-loidl, k-) adj.

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colloid

[kol′oid]

Etymology: Gk, kolla, glue, eidos, form

a state or division of matter in which large molecules or aggregates of molecules (1 to 100 nm in size) do not precipitate and are dispersed in another medium. In a suspension colloid the particles are insoluble and the medium may be solid, liquid, or gas. In an emulsion colloid the particles are usually water, and the medium is any of several complex hydrophilic, organic substances that become evenly dispersed among the particles of water. Compare solution, suspension.

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colloid,

n submicroscopic particles suspended in either a gaseous, liquid, or solid medium that does not separate. When homeopathic remedies are created from source materials, a colloidal phase may occur after trituration with lactose.

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colloid (kol´oid),

n a suspension of particles in a dispersion medium. The particles generally range in size from 1 to 100 mm. Hydrocolloids and silicate cements are examples of dental colloids.

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colloid

1. gluelike.

2. the translucent, yellowish, gelatinous substance resulting from colloid degeneration.

3. a chemical system composed of a continuous medium (continuous phase) throughout which are distributed small particles, 1 to 1000 nm in size (disperse phase), which do not settle out under the influence of gravity. For example, if the disperse phase is a solid and the dispersing phase a liquid, the system is called a sol, such as glue. Milk is an example of an emulsion, in which both phases are liquid, one an oil and one water. Colloidal particles are not capable of passing through a semipermeable membrane, as in dialysis. Solutes that can pass through a semipermeable membrane are sometimes called crystalloids.

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stannous sulfur colloid

a sulfur colloid containing stannous ions formed by reacting sodium thiosulfate with hydrochloric acid, then adding stannous ions; a diagnostic aid in bone, liver and spleen imaging.