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: | |||
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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. |
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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. |
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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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