Colloid





Colloid 2790
Photo by: Ivaylo Ivanov

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.

Types of colloids

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.

Types of Colloids

Colloid

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

Properties of colloids

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).

Light shining through a solution of sodium hydroxide (left) and a colloidal mixture. The size of colloidal particles makes the mixture, which is neither a solution nor a suspension, appear cloudy. (Reproduced by permission of Photo Researchers, Inc.)
Light shining through a solution of sodium hydroxide (left) and a colloidal mixture. The size of colloidal particles makes the mixture, which is neither a solution nor a suspension, appear cloudy. (Reproduced by permission of
Photo Researchers, Inc.
)



User Contributions:

Braty Angel
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Oct 21, 2008 @ 11:11 am
What are some more examples of colloids. Also do you know any examples of Suspensions, Solutions, and mixtures?
heidee
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Mar 5, 2009 @ 4:04 am
thanks for the information





i love it...



i hope that you have all the information about chemistry so that i will have my answer..
theGenius.
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Mar 31, 2009 @ 9:21 pm
This is a very helpful site that really let me know even more about colloids! Thank you for posting this. It really helped me... i mean like, a lot.

-theGenius.
layka
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Aug 5, 2009 @ 6:06 am
why do most colloids have electrical charges?

why are colloids good adsorbents?
bharath kumar
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Aug 17, 2009 @ 1:13 pm
THANK YOU VERY MUCH this is so nice and very conceptual i thank everybody those who help to know this information and WOULD YOU GIVE ANY MORE INFORMATION ABOUT COLLOIDS?
llaine
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Sep 12, 2009 @ 9:21 pm
what is the another properties of colloids??

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!!!!

i love it...
now i can answer my assignments...

i love this site!!

thanks....
mwuahh
Agbor Derrec
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Sep 19, 2009 @ 10:10 am
Hello!

This research was good. My nightmare about colloids is gone.

My best regards
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May 20, 2010 @ 4:16 pm
Thanks this information. I could use this for some homework. Thanks again.
Manoj Kariavattom
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Jul 19, 2010 @ 10:10 am
Thank you very much.
Expecting more valuable information like this.
Again Thank you.
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Jul 26, 2010 @ 5:05 am
more information please...thnks though.it helped me alot..
van
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Aug 23, 2010 @ 7:19 pm
Do you have other examples of colloids and what is aerosol ?
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Aug 31, 2010 @ 3:03 am
aerosol are suspension of liquid to solid or gas
examples are smoke smog fog
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Sep 1, 2010 @ 7:07 am
it is important to study the colloids and their
other functions

i love it
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Sep 7, 2010 @ 6:18 pm
Exceptional! Thank you very much. The information was clear and easy to understand. Keep doing what you're doing!!
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Sep 8, 2010 @ 12:00 am
thanks for the examples it was a great help for us, especially in our report. ^_^
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Sep 13, 2010 @ 7:07 am
what is the differentiate between suspensions and colloids?
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Oct 5, 2010 @ 5:05 am
what are the importance of properties of colloids in technology, medicine, and households?
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Oct 6, 2010 @ 12:00 am
thanks.,!

a great help,specially in my project.Thanks a lot,,
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Oct 7, 2010 @ 8:20 pm
.i get all information i want ! thanks ..
.i really appreciate the maker of this article ..
.keep it up !
.i hope you made a lot of articles ..
sri
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Oct 18, 2010 @ 1:01 am
do you know the examples of cooloidal solutions , true solution, suspension solution
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Nov 3, 2010 @ 6:06 am
why is that the color of the sky is blue while the clouds is white?
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Nov 14, 2010 @ 5:05 am
thank you for the info..

your website is very useful..

keep it up!
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Dec 6, 2010 @ 5:05 am
mmp thanks sa info nyo.. i learn more about colloids
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Jan 22, 2011 @ 2:02 am
Thank you very much !!!
it helps a lot in our group project in chemistry :))
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Feb 3, 2011 @ 3:03 am
what are the defferent proccesses use inpreparring colloids?...
Claire
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Feb 9, 2011 @ 5:17 pm
That helped me on my science project. I think i will tell my teacher about this website.Thank You
Precious
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Mar 7, 2011 @ 7:19 pm
Thanks for this information.Please elaborate on the topic.Thanks
edilyn rodriguez
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Mar 9, 2011 @ 3:03 am
I LEARN LOT ABOUT COLLIODS.MMP THANKS SA INFO NYO, IT HELP A LOTIN OUR GROUP REPORT IN CHEMISTRY.
john angelo
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Mar 11, 2011 @ 8:20 pm
thank you for infos. more science topic i have discovered because of this webpage
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Mar 20, 2011 @ 12:00 am
THE ARTICLE IS NICE BUT NEXT TIME, CAN YOU ADD MORE IMAGES WHEN REGARDS TO TYPES OF COLLOIDS? I WOULD REALLY APPRECIATE IF YOU WOULD CONSIDER MY SUGGESTION.
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Mar 27, 2011 @ 3:15 pm
This was very informative and yet easy to read and understand! It is amazing that the science is so specific! I wish more people were interested in science! It is pretty cool!!
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Jul 26, 2011 @ 5:05 am
i like it and also hope that you would cite , some examples of water too,,, at least three examples im hoping ,,,
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Jul 29, 2011 @ 10:22 pm
me i know what are the disadvantages of colloids ? :))
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Aug 28, 2011 @ 9:09 am
I love this page so much. I know the relevance of colloid.
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Sep 1, 2011 @ 2:02 am
I like this page as it is the most simplified one and is very accessible to use it when in time of need. I look forward in future to receive such help.
jolina octa
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Sep 10, 2011 @ 7:19 pm
how we consider that the paper is an ex. of colloids?
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Sep 15, 2011 @ 5:05 am
This article is so informative!
and STRAIGHT to the point.
Everything written here is so UNDERSTANDABLE!


so GOOD WORK!
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Sep 15, 2011 @ 9:21 pm
It is helpful to me to search about the liquid colloids to answer my task/home work in my school.
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Sep 20, 2011 @ 8:08 am
I hope you add more information 'bout colloids... for wider understanding.. thanks
shayla-loves-alex
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Sep 25, 2011 @ 12:12 pm
Thank you so much! it really helped with my paper!!!
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Oct 6, 2011 @ 6:06 am
I really love all the informations about this article i can easily understand the difference between its classes



thank you for this informations
keep this up guyz
^_^



congratulations for this success
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Oct 10, 2011 @ 8:08 am
It gives more impormation...for my homework and projects..
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Oct 16, 2011 @ 7:19 pm
We are comparing Oobleck (corn starch and water) with the properties of the asthenosphere. We know that Oobleck has properties of colloids, but does the asthenosphere have colloid properties?
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Nov 14, 2011 @ 1:01 am
Thx for your informations, it's make me enrich the knowledge
sam.prince
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Dec 1, 2011 @ 11:23 pm
Why is it not possible to have a gas in gas type of colloid? Thank you
jang
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Dec 14, 2011 @ 7:07 am
what significant role do colloids play in the life of plants? tnx
Patricia :)
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Jan 5, 2012 @ 8:08 am
This finally answered my questions! It has a clear description and examples unlike to any other sites. THANK YOU! Keep it up
Jhane :)
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Jan 10, 2012 @ 8:08 am
whats is difference between tyndall movement and brownian motion ?
RhidZ
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Jan 16, 2012 @ 5:05 am
colloid is any substance that exhibits tyndall effect or brownian movment
tyndall effect is the movement of light and brownian movement is the movement of colloid particles
Benbolove Bilson
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Feb 6, 2012 @ 5:17 pm
I realy like this site. All my science researches are done here, as i prepare for my final exams(WASSCE).
ryzza mae genes
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Feb 7, 2012 @ 9:09 am
i realy like this site.all my science researched are done here as i prepare for my final exams
JASON MAGBANUA POGI
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Feb 20, 2012 @ 8:20 pm
HI IM Jason I love boys but dont tell my mother please
marivic
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Mar 7, 2012 @ 5:05 am
thx for this it helps! ^_^
try to put more examples thank you
jamille wills
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May 7, 2012 @ 6:18 pm
tank you for your information it helps me a lot in all my studies a lot
Linda Davies
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May 22, 2012 @ 10:10 am
Is this what a facebook is? Im not quite sure what I am doing but i know this is a post.
Jorge
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Jun 12, 2012 @ 10:10 am
Excellent! Helped me a lot to finally understand colloids.
chrzlyn redondo
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Jun 27, 2012 @ 12:00 am
I learn more about it. thanks a lot.
i love to know more about it.
kelly
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Jun 27, 2012 @ 2:14 pm
i really like this site alot it helps my homework anybody know what is separation techniques
jmmagma
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Aug 22, 2012 @ 9:21 pm
the Light shining through a solution of sodium hydroxide is very amazing
Patrisha
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Sep 18, 2012 @ 7:07 am
Why is it not possible to have a gas in gas type of colloid?
rexie cute 29
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Sep 24, 2012 @ 6:18 pm
the difference

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.
nicole fam
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Jan 8, 2013 @ 4:04 am
thank you for this answer this can help me study my homework's
nicole fam
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Jan 8, 2013 @ 4:04 am
this is a great answer i love science thanks a lot!
mercy
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Feb 3, 2013 @ 9:21 pm
TNX FOR THIS IT HELPS ME VERY MUCH IN MY LESSON.
PLEASE GIVE EXPERIEMENTS FOR MORE UNDERSTANDING OF COLLOIDS
akocphendumelod
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Feb 14, 2013 @ 4:04 am
why do we need to introduce your own answer if we dont know your questions about the 5 senses of colloids?
S.S.
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Mar 20, 2013 @ 6:18 pm
it helped me understand the term colloid. its important to know it
sarahmae
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Apr 16, 2013 @ 5:05 am
Very nice. i really love the way it was explained!
wendy
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Apr 17, 2013 @ 9:09 am
I am having fun reading this one it helps me a lot.thnx
jefelyn gymai
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Jun 20, 2013 @ 6:06 am
this website is so unique and so cool.. the information are complete..

i will always visit this site every time that i have an assignment regarding to science.. thanks much ..you builder :)))
Subham
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Jan 29, 2014 @ 9:21 pm
a colloidal state of a substance can be regarded as an intermediate
state between a true solution and a suspension example plz .

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