- #1
superwolf
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How do you interpret this?
Colloidal chemistry - interpretation of lecture notes
- Thread starter superwolf
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In summary, the conversation discusses the requirements for forming a functional micelle, specifically the need for at least 8 surfactant molecules with a certain carbon chain length. It also mentions the effects of solution temperature and electrolytes on the behavior of non-ionic and ionic surfactants. The behavior of non-ionic surfactants can change with temperature, while ionic surfactants can also be affected by electrolytes in the solution.
How do you interpret this?
- #2
anisotropic
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My guess is:
- Greater than 8 surfactant molecules are required to form a functional micelle.
- Non-ionic surfactant behaviour is affected by solution temperature.
- Ionic surfactant behaviour is affected by electrolytes in solution.
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- #3
superwolf
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Seems reasonable :)
- #4
chemisttree
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What it really means is that you need at least 8 carbons in your alkyl chain before you start to form stable micelles. It isn't impossible for C7 compounds to do it but http://pubs.acs.org/doi/abs/10.1021/jm00228a025"
The other part of your notes can be interpreted as: As you change the temperature in solutions of non-ionic surfactants you can see different behavior (different behavior = changes in CMC for example). In ionic surfactants, electrolytes can cause these changes as well (as does temperature but they are not as sensitive to temperature as the non-ionic ones).
The other part of your notes can be interpreted as: As you change the temperature in solutions of non-ionic surfactants you can see different behavior (different behavior = changes in CMC for example). In ionic surfactants, electrolytes can cause these changes as well (as does temperature but they are not as sensitive to temperature as the non-ionic ones).
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1. What is colloidal chemistry?
Colloidal chemistry is a branch of chemistry that deals with the study of colloids, which are particles that are intermediate in size between individual molecules and bulk solids. Colloids have unique properties and behavior due to their small size and large surface area.
2. How are colloids formed?
Colloids can be formed through various methods such as condensation, dispersion, and chemical reactions. In condensation, small particles come together to form larger particles. In dispersion, larger particles are broken down into smaller ones. Chemical reactions can also produce colloids when two or more substances react to form insoluble particles.
3. What are some examples of colloids?
Some common examples of colloids include milk, paint, fog, and gelatin. In milk, the fat particles suspended in the liquid are colloids. Paint is also a colloid, with pigment particles dispersed in a liquid medium. Fog is a colloid made up of water droplets suspended in the air. And gelatin is a colloid made up of long protein molecules dispersed in water.
4. How are colloids different from solutions?
Colloids and solutions both consist of particles dispersed in a medium, but they differ in the size of the particles. In a solution, the particles are molecules or ions that are uniformly distributed and cannot be seen with the naked eye. In colloids, the particles are larger and can be seen under a microscope, but they do not settle out due to the constant motion of the particles.
5. What is the importance of colloidal chemistry?
Colloidal chemistry has many practical applications in various industries such as food, pharmaceuticals, cosmetics, and materials science. Understanding colloids is crucial for creating stable and effective products, as well as for developing new materials with unique properties. Colloidal systems also play a significant role in environmental processes, such as the transport of pollutants in water and soil.
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