Coagulation In Colloids
Do you know what rubber is made of?
Rubber is made from rubber tree sap or often also called latex. This sap is white and liquid and is one example of a sole colloidal system. The rubber sap consists of two phases: a solid dispersed in a liquid. Solid substances in rubber tree sap are what will be taken to be made into rubber.
How to separate solids from liquids on rubber tree sap? Industrially, it is done by coagulating rubber latex using acidic compounds such as formic acid or acetic acid.
What is coagulation?
Coagulation is one of the properties of the colloidal system. Coagulation is a clumping of colloidal particles so that the colloidal system becomes unstable or even lost. These clumped colloid particles will settle at the bottom of the container.
Coagulation can occur through the following events.
Colloid charge turns to neutral.
The charge on colloidal particles serves to improve stability. When the charge of colloidal particles is lost, the particles become unstable and tend to precipitate.
One way to make the charge of colloidal particles to be neutral is to use the electrophoresis method. In electrophoresis, cells will be flowing with the electric current. When the charged colloidal particles are passed into electric field in the cell, then the particle will be attracted to one of the electrodes.
Why can colloid particles precipitate?
The reason is that when the charge of the colloidal particles reaches the opposite electrode, it will turn into neutral and then settle in there.
Coagulation can happen when we add an electrolyte solution into the colloidal system.
An electrolyte solution consists of two different ions called anion and cation. When we add this electrolyte into the colloidal system that has a positive charge, then the anion from electrolyte will be attracted to the positive particle of the colloids.
Instead, when we add the electrolyte into the negative colloidal system, then the cation will be attracted to the negative particle of the colloids.
The ions from electrolyte will cover the whole surface of colloids particle, so making it become a neutral charge particle.
Since the colloidal particles are already neutral, the stability of the particles will be lost. As a result, colloidal particles will begin to precipitate and coagulate.
One application of colloid coagulation using electrolyte solution is in the process of making tofu. Soybeans that are crushed with water will form an emulsion. Emulsions can be coagulated with the addition of CaSO4.2H2O. CaSO4.2H2O is an electrolyte compound and better known as "stone know".
In everyday life, the colloidal coagulation properties are widely used in the following process.
Rubber is made from rubber tree sap or often also called latex. This sap is white and liquid and is one example of a sole colloidal system. The rubber sap consists of two phases: a solid dispersed in a liquid. Solid substances in rubber tree sap are what will be taken to be made into rubber.
How to separate solids from liquids on rubber tree sap? Industrially, it is done by coagulating rubber latex using acidic compounds such as formic acid or acetic acid.
What is coagulation?
Coagulation is one of the properties of the colloidal system. Coagulation is a clumping of colloidal particles so that the colloidal system becomes unstable or even lost. These clumped colloid particles will settle at the bottom of the container.
Coagulation can occur through the following events.
Colloid charge turns to neutral.
The charge on colloidal particles serves to improve stability. When the charge of colloidal particles is lost, the particles become unstable and tend to precipitate.
One way to make the charge of colloidal particles to be neutral is to use the electrophoresis method. In electrophoresis, cells will be flowing with the electric current. When the charged colloidal particles are passed into electric field in the cell, then the particle will be attracted to one of the electrodes.
- If the charge of the colloidal particle is positive, it will be attracted to the negative electrode and settle there.
- If the charge of the colloidal particle is negative, it will be attracted to the positive electrode and settle there.
Why can colloid particles precipitate?
The reason is that when the charge of the colloidal particles reaches the opposite electrode, it will turn into neutral and then settle in there.
Coagulation can happen when we add an electrolyte solution into the colloidal system.
An electrolyte solution consists of two different ions called anion and cation. When we add this electrolyte into the colloidal system that has a positive charge, then the anion from electrolyte will be attracted to the positive particle of the colloids.
Instead, when we add the electrolyte into the negative colloidal system, then the cation will be attracted to the negative particle of the colloids.
The ions from electrolyte will cover the whole surface of colloids particle, so making it become a neutral charge particle.
Since the colloidal particles are already neutral, the stability of the particles will be lost. As a result, colloidal particles will begin to precipitate and coagulate.
One application of colloid coagulation using electrolyte solution is in the process of making tofu. Soybeans that are crushed with water will form an emulsion. Emulsions can be coagulated with the addition of CaSO4.2H2O. CaSO4.2H2O is an electrolyte compound and better known as "stone know".
In everyday life, the colloidal coagulation properties are widely used in the following process.
- Clumping of mud or clay in the water purification process using alum.
- The process of delta formation at the mouth of the river. This delta is formed when the mud from river water meets with sea water. Seawater contains a great many electrolyte compounds that can precipitate charged colloidal particles.
- Neutralizing albuminoid in the blood so that the wound on the body can close.
- Dust clogs or factory smoke using an electrical coagulation device called a Cottrell machine.
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