Suspensions, Colloids and Solutions

Malvern에서는 기본 이론 관련된 강의를 여러분들에게 소개하여 드리고자 합니다.

영어로 된 강의라서 더 이상하실 수 있지만 천천히 들어보시면 영어 공부도…


자세하게 소개하는 강의이므로 여유롭게 들어보세요..




간단하게 설명하면,


  Solution Suspension Colloid
Appearance Clear, transparent and homogeneous Cloudy, heterogeneous, at least two substances visible Cloudy but uniform and homogeneous
Particle Size  molecule in size larger than 10,000 Angstroms 10-1000 Angstroms 
Effect of Light Tyndall Effect none — light passes through, particles do not reflect light variable  light is dispersed by colloidal particles 
Effect of Sedimentation none particles will eventually settle out  none
In summary:

  A solution is always transparent, light passes through with no scattering from solute particles which are molecule in size. The solution is homogeneous and does not settle out. A solution cannot be filtered but can be separated using the process of distillation.

  A suspension is cloudy and heterogeneous. The particles are larger than 10,000 Angstroms which allows them to be filtered. If a suspension is allowed to stand the particles will separate out.

  A colloid is intermediate between a solution and a suspension. While a suspension will separate out a colloid will not. Colloids can be distinguished from solutions using the Tyndall effect. Light passing through a colloidal dispersion, such as smoky or foggy air, will be reflected by the larger particles and the light beam will be visible.

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