2006-10-26 12:33:10 · 3 answers · asked by Anonymous in Education & Reference ➔ Homework Help
In general, a colloid or colloidal dispersion is a substance with components of one or two phases, a type of mixture intermediate between a homogeneous mixture (also called a solution) and a heterogeneous mixture with properties also intermediate between the two. Typical membranes restrict the passage of dispersed colloidial particles more than they restrict the passage of dissolved ions or molecules; i.e. ions or molecules may diffuse through a membrane through which dispersed colloidal particles will not. The dispersed phase particles are largely affected by the surface chemistry existent in the colloid.
Many familiar substances, including butter, milk, cream, aerosols (fog, smog, smoke), asphalt, inks, paints, glues, and sea foam are colloids. This field of study was introduced in 1861 by Scottish scientist Thomas Graham.
The size of dispersed phase particles in a colloid range from one nanometer to one micrometer. Dispersions where the particle size is in this range are referred to as colloidal aerosols, colloidal emulsions, colloidal foams, or colloidal suspensions or dispersions. Colloids may be colored or translucent because of the Tyndall effect, which is the scattering of light by particles in the colloid.
2006-10-26 12:41:13 · answer #1 · answered by davidalden98 3 · 0⤊ 0⤋
A colloid is a mixture in which the solute particles do not easily settle out.
2006-10-28 18:21:05 · answer #2 · answered by ineedonebuddy 3 · 0⤊ 0⤋
Aerosol has solid or liquid particles suspended in gas. When operated, it comes out as a flow of vaporised - gas like form. sol is used in very near meaning of solution - it is in fact particles suspended in a liquid. Emulsion is a mix of hydrophilic and hydrophobic liquids - balanced is a particular manner. Milk and Bread are one of the best examples of emulsions in liquid phase and solid phase. Gel is a solidified or semi solid form of matter. Sol and Gel are very close to each other. Silica gel is a good water absorbent. It is sometimes gas trapped in liquid. Colloids are mixtures of things that do not dissolve into each other, but keeps solids suspended in liquid phase for specific purpose.
2016-05-21 23:20:02 · answer #3 · answered by Anonymous · 0⤊ 0⤋