Colloids are mixtures whose particles are larger than the size of a molecule but smaller than particles that can be seen with the naked eye. Colloids are one of three major types of mixtures, the other two being solutions and suspensions. The three kinds of mixtures are distinguished by the size of the particles that make them up. The particles in a solution are about the size of molecules, approximately 1 nanometer (1 billionth of a meter) in diameter. Those that make up suspensions are larger than 1,000 nanometers. Finally, colloidal particles range in size between 1 and 1,000 nanometers. Colloids are also called colloidal dispersions because the particles of which they are made are dispersed, or spread out, through the mixture.
Colloids are common in everyday life. Some examples include whipped cream, mayonnaise, milk, butter, gelatin, jelly, muddy water, plaster, colored glass, and paper.
Every colloid consists of two parts: colloidal particles and the dispersing medium. The dispersing medium is the substance in which the colloidal particles are distributed. In muddy water, for example, the colloidal particles are tiny grains of sand, silt, and clay. The dispersing medium is the water in which these particles are suspended.
Colloids can be made from almost any combination of gas, liquid, and solid. The particles of which the colloid is made are called the dispersed material. Any colloid consisting of a solid dispersed in a gas is called a smoke. A liquid dispersed in a gas is referred to as a fog.
Dispersed Material | Dispersed in Gas | Dispersed in Liquid | Dispersed in Solid |
Gas (bubbles) | Not possible | Foams: soda pop; whipped cream; beaten egg whites | Solid foams: plaster; pumice |
Liquid (droplets) | Fogs: mist; clouds; hair sprays | Emulsions: milk; blood; mayonnaise | butter; cheese |
Solid (grains) | Smokes: dust; industrial smoke | Sols and gels: gelatin; muddy water; starch solution | Solid sol: pearl; colored glass; porcelain; paper |
Each type of mixture has special properties by which it can be identified. For example, a suspension always settles out after a certain period of time. That is, the particles that make up the suspension separate from the medium in which they are suspended and fall to the bottom of a container. In contrast, colloidal particles typically do not settle out. Like the particles in a solution, they remain in suspension within the medium that contains them.
Colloids also exhibit Brownian movement. Brownian movement is the random zigzag motion of particles that can be seen under a microscope. The motion is caused by the collision of molecules with colloid particles in the dispersing medium. In addition, colloids display the Tyndall effect. When a strong light is shone through a colloidal dispersion, the light beam becomes visible, like a column of light. A common example of this effect can be seen when a spotlight is turned on during a foggy night. You can see the spotlight beam because of the fuzzy trace it makes in the fog (a colloid).
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why are colloids good adsorbents?
can you define it?
like phase,particle size,tyndall effect,brownian movement,
and adsorption.....that is the properties of colloids..
but,what is the meaning of that?
and thank you for the information!!!!
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examples are smoke smog fog
other functions
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tyndall effect is the movement of light and brownian movement is the movement of colloid particles
try to put more examples thank you
i love to know more about it.
Solution is mixture of 2 or more substances in equal proportion such as sugar or salt in water.But to differentiate colloid and suspension solution,there is big diff. that in colloidal solution,size of colloidal particle is in between 1 to 1000 nm and they show scattering of light(even though they r not visible with naked eye) and for suspension solution,suspended particles r in range of size of more than 1000 nm.These particles can be seen through naked eyes.
PLEASE GIVE EXPERIEMENTS FOR MORE UNDERSTANDING OF COLLOIDS
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state between a true solution and a suspension example plz .
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- From DerielleB
Thanks for the help it really helps me with my Chemistry test
i learnt that colloid are mixtures whose particles are larger than the size of a molecule but smaller than particles that can be seen with the naked eye
Thanks you it hrlp in my project
How watrer absorbtion is done on soil of colloidal surface