All Questions
Tagged with colloids surface-chemistry
13
questions
6
votes
0
answers
428
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Why is there preferential adsorption of a common ion during preparation of colloids by peptization?
There was a similar question asked here on Chem SE, but the answer was not very satisfactory to me, so I am asking a fresh question.
Peptization is the process of creating a colloid from a precipitate ...
- 543
3
votes
0
answers
131
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Do lyophilic sols have an electrical double layer?
"There are two factors which are responsible for the stability of lyophilic sols. These factors are the charge and solvation of the colloidal particles".
Quoted from NCERT book of OC
But we ...
- 279
3
votes
0
answers
183
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How do lyophilic colloids reduce surface tension?
It's given in my textbook that the surface tension of lyophilic/hydrophilic solutions is lower than water.
But my intuition says, since in lyophilic solutions the interaction between a lyophilic ...
- 181
1
vote
0
answers
26
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What is the influence of citrate on PEG-modified polyacrylamide hydrogels?
I've been having a puzzle explaining the experimental results with the citrate anions and PEG modified polyacrylamide:
According to the experimental data there is a hydrogel swelling whenever citrate ...
2
votes
2
answers
796
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How does adding HCl convert AgCl into a sol?
According to the text I follow, in peptization the ions of the added electrolyte (peptizing agent) get adsorbed by the particles of the precipitate and turn the precipitate into a sol. An example of ...
- 157
1
vote
1
answer
2k
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Electric double layer formation
What textbook states about the formation of electric double layer:
When silver nitrate solution is added to potassium iodide solution the precipitated silver iodide adsorbs iodide ion from ...
- 460
0
votes
0
answers
184
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What is the logic behind the terminology lyophilic and lyophobic colloids?
Its given in my text book that-
Colloidal dispersions of starch,rubber,proteins etc are lyophilic colloids whereas colloidal dispersions of metals,sulphides etc are lyophobic in nature.
But even ...
- 460
1
vote
1
answer
733
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Acid-Temperature coagulation of milk
I was making coffee with a cup of boiling milk which was 2 days old. I used instant coffee powder and some sugar for the making of it. Tried to make a very hot coffee but usually prefer medium hotness....
1
vote
1
answer
129
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What decides the nature of emulsifying agents?
I read
The emulsifying
agent forms an interfacial film between suspended particles and the
medium. The principal emulsifying agents for O/W emulsions are
proteins, gums, natural and ...
- 297
1
vote
1
answer
247
views
Is it possible to prevent agglomeration and sedimentation of microparticles just by increasing the viscosity of the medium?
I am considering a suspension of a fine powder in a high-viscosity liquid. The suspension shall be stable over long time scales, i.e. the particles only move a few mm per year, and I have the ...
- 275
13
votes
2
answers
60k
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Hardy Schulze law
I have trouble understanding this particular law.
It states that:
Greater the valency of the flocculating ion, greater will be its coagulation power.
Why does this happen? What is the intuition ...
- 395
1
vote
1
answer
3k
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Why is gold sol used for intra-muscular injection?
In my textbook it is written that gold sol is used for intramuscular injection. But, actually what is its use? Why would people use such a precious element for injection. Can other colloids be used ...
- 3,345
7
votes
3
answers
17k
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The entropy change during micellization
I was reviewing the thermodynamics of micelle formation from the Wikipedia page and this book. I understood most of the arguments but micellization is supposed to be an entropy driven process with a ...
- 6,795