| Topic: |
Science > Physics |
| User: |
"Ross" |
| Date: |
03 Mar 2005 07:43:57 AM |
| Object: |
definition of gel |
in one definition, gel is defined as colloid with solid as a dispersing
phase while liquid as a dispersed phase. is the dispersing phase equivalent
to a solvent? if so, how come a 1% gel is defined as gel?
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| User: "tadchem" |
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| Title: Re: definition of gel |
03 Mar 2005 08:29:28 AM |
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Ross wrote:
in one definition, gel is defined as colloid
'colloid: a colloid is a heterogeneous mixture composed of tiny
particles suspended in another material.'
<http://antoine.frostburg.edu/chem/senese/101/glossary/c.shtml#colloid>
with solid as a dispersing
phase while liquid as a dispersed phase.
-'gel: a gel is a sol in which the solid particles fuse or entangle to
produce a rigid or semirigid mixture.'
<http://antoine.frostburg.edu/chem/senese/101/glossary/g.shtml#gel<
- 'sol: a colloid with solid particles suspended in a liquid. Examples
are protoplasm, starch in water, and gels.'
http://antoine.frostburg.edu/cgi-bin/senese/searchglossary.cgi?query=sol&shtml=%2Fchem%2Fsenese%2F101%2Fglossary.shtml
*gel => a heterogeneous mixture*
is the dispersing phase equivalent
to a solvent?
'solvent: the most abundant component in a solution'
<http://antoine.frostburg.edu/chem/senese/101/glossary/s.shtml#solvent>
'solution: a sample of matter consisting of more than one pure
substance with properties that do not vary within the sample. Also
called a homogeneous mixture.'
<http://antoine.frostburg.edu/chem/senese/101/glossary/s.shtml#solution>
*solution => a homogeneous mixture*
if so, how come a 1% gel is defined as gel?
Percent composition is not as important as the distinction between
homogeneous and heterogeneous.
Aerogels
<http://en.wikipedia.org/wiki/Aerogel>
typically contain <1% solid and the remainder is a gas or vapor. (Nice
pictures here.)
Tom Davidson
Richmond, VA
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