Hydrophilic vs Hydrophobic Colloids

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Hydrophilic colloids have a

high viscosity

The high viscosity associated with the hydrophilic colloids allow you to

interact the dispersion phase with the dispersion medium

The hydrophobic colloids have a

low viscosity

The low viscosity associated wit the hydrophobic colloids prevent the

dispersion phase from interacting with the dispersion medium

The hydrophilic colloid haS a

difficult time passing light through the colloid
- it has a low Tyndall Effect

The hydrophobic colloid

does not have a difficult time passing light through a colloid

The hydrophilic colloids are

very stable
they are not reactive to a low concentration of electrolytes

The hydrophobic colloids are

very unstable
they are very sensitive to a low concentration of electrolytes

Can hydrophilic colloids be reversed

Yes they are reversible

If you take a hydrophilic colloid heat it, get rid of the water and then place it back into water it

can be reused again

The hydrophobic colloids are

irreversible and you can not use them again after they have been used

The materials in which the hydrophilic colloids are dispersed in are

organic and inorganic

The molecules that the hydrophobic colloids are dispersed in are

inorganic material

what type of charge is associate with the hydrophobic colloids

positive or negative

What type of charge is associated with the hydrophilic colloids

positive, negative and neutral

How are hydrophilic colloids created

by mixing the colloid in water, there is no special procedure required

How are hydrophobic colloids created

via chemical or physical means
- mortal and pestle via grinding into smaller pieces

Hydrophilic colloids become

ionized when place in water

Hydrophobic colloids do

not ionize when placed in water but they become charged by picking up ions from the dispersion medium during preparation

Hydrophobic colloids can be prepared physically by

grinding up the substance with a mortal and pestle and then adding them to the dispersion medium

Methods used to prepare a hydrophobic colloid include

colloid mill
micronizer
ball mill
ultrasonic generator

When preparing a hydrophobic colloid you have to manipulate the particle size by getting it into

colloïdal range by changing the solvent
- this is known as the condensation method

Manipulation of the size of colloid sulfur occurs by adding sulfur to hot alcohol to produce

sulfur in the sub colloidal range
at this point the substance is insoluble in water and it will precipitate our

Once the colloidal sulfur has been precipitated out its in

colloïdal range
- it then has charges that will allow it to be kept in suspension

AgNO₃+ NaCLl→AgCl+ NaCo₃ is an example of

condensation with a chemical reaction

A high concentration of NaCl with a low concentration of AgNO₃ the particle will be

negative charged

A low concentration of NaCl with a high concentration of AgNO₃ the particle will be

positively charged

Schulze- Hardy has a rule pertaining to

hydrophobic colloids

Hardy states that the

arrangement od the ions should be based upon their ability to precipitate hydrophobic colloids related to the value of the compound

Trivalent compounds will have a greater precipitate power than

monovalent compounds

AlCl+++ takes

less AlCl to PPt in the hydrophobic colloid and is more sensitive to electrolytes

NaCl+ has the

lowest precipitate port and it take more NaCl to ppt in the hydrophobic colloid
less sensitive to electrolytes

If you treat a hydrophobic colloid with a hydrophilic colloid (protective) the hydrophobic colloid

will not respond to the change in e-

Hydrophilic colloids are not

affected by charge

As it relates to charge the hydrophobic colloids

are affected

Hydrophilic colloids have a

↑ attraction for the dispersion medium

Hydrophobic colloids have a

↓ attraction for the dispersion medium

As it relates to stability hydrophilic colloids are

stable to a low concentration of electrolytes

As it relates to stability hydrophobic colloids are

not stable to a low concentration of electrolytes

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