Difference between revisions of "Colloidal Dispersion"

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== Definition ==
 
== Definition ==
'''Colloidal dispersions''' are a class of soft materials. The term typically refers to a material consisting of solid particles spread throughout a fluid. According to Jones [1, p. 49], colloidal particles must have dimensions on the order of 10<math>\mu</math>m or smaller.
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'''Colloidal dispersions''' are a class of soft materials. The term typically refers to a material consisting of solid particles spread throughout a liquid. According to Jones [1, p. 49], colloidal particles must have dimensions on the order of 10<math>\mu</math>m or smaller.
  
Witten [2, p. 113] distinguishes between colloids (solid particles in liquid), emulsions (liquid drops in another liquid), and foams (gas bubbles in a liquid), while Jones [1, p. 1] includes emulsions as a subgroup of colloidal dispersions. One can also find definitions of colloidal dispersions which include other combinations of solid, liquid, and gas phases.
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Witten [2, p. 113] distinguishes between colloids (solid particles in liquid), emulsions (liquid drops in another liquid), and foams (gas bubbles in liquid) while Jones [1, p. 1] includes emulsions as a subcategory of colloidal dispersions. One can also find definitions of colloidal dispersions which include other combinations of solid, liquid, and gas phases.
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When discussing the components of colloidal dispersions, the term "phase" has at least two meanings. Phase can refer to the liquid, solid, or gas state of the component materials and can also be used in the sense of the "dispersed phase" or "continuous phase." The particles in a colloidal dispersion collectively make up the dispersed phase, and the material between the particles is the continuous phase.
  
 
== Examples ==
 
== Examples ==
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*Paint
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*Ink
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*[http://nccam.nih.gov/health/silver/ Colloidal Silver]
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*[http://www.howstuffworks.com/question617.htm Mayonnaise]
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== References ==
 
== References ==
 
[1] R. Jones, "Soft Condensed Matter," Oxford University Press Inc., New York (2002).
 
[1] R. Jones, "Soft Condensed Matter," Oxford University Press Inc., New York (2002).
  
 
[2] T. Witten, "Structured Fluids: Polymers, Colloids, Surfactants," Oxford University Press Inc., New York (2004).
 
[2] T. Witten, "Structured Fluids: Polymers, Colloids, Surfactants," Oxford University Press Inc., New York (2004).

Latest revision as of 14:32, 14 September 2009

Definition

Colloidal dispersions are a class of soft materials. The term typically refers to a material consisting of solid particles spread throughout a liquid. According to Jones [1, p. 49], colloidal particles must have dimensions on the order of 10<math>\mu</math>m or smaller.

Witten [2, p. 113] distinguishes between colloids (solid particles in liquid), emulsions (liquid drops in another liquid), and foams (gas bubbles in liquid) while Jones [1, p. 1] includes emulsions as a subcategory of colloidal dispersions. One can also find definitions of colloidal dispersions which include other combinations of solid, liquid, and gas phases.

When discussing the components of colloidal dispersions, the term "phase" has at least two meanings. Phase can refer to the liquid, solid, or gas state of the component materials and can also be used in the sense of the "dispersed phase" or "continuous phase." The particles in a colloidal dispersion collectively make up the dispersed phase, and the material between the particles is the continuous phase.

Examples

References

[1] R. Jones, "Soft Condensed Matter," Oxford University Press Inc., New York (2002).

[2] T. Witten, "Structured Fluids: Polymers, Colloids, Surfactants," Oxford University Press Inc., New York (2004).