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- Write a note on colour of Colloidal Solutions.
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- What is Tyndall effect.
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- Write a note on Mechanical Properties of Colloidal Solutions.
5553 Views
- Write a note on Electrical Properties of Colloidal Solutions.
9906 Views
- Write a short note on Stability and Protection of Colloids (Coagulation).
5363 Views
- What is Electrophoresis? Explain the apparatus for measuring the electrophoretic mobility?
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By Sunil Bhardwaj
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Migration of colloidal particles under the influence of an electric field is called electrophoresis or cataphoresis.
It is possible to detect the type of charge present on the colloidal particles by noting the direction of movement of particles.
The electrophoresis apparatus consists of U tube provided with a stop cock. A funnel shaped reservoir is connected to U tube through this stop cock. A small amount of water or a solution of some suitable electrolyte of lower density than sol is first placed in the U tube. Now the sol is introduced slowly. The electrolyte or water is displaced upwards and sharp boundaries are produced in both the arms of U tube.
The suitable electrodes are then inserted as shown in the figure and connected to suitable source of potential. The movement of colloidal particles can be easily observed by looking at the position of boundary. From the direction of movement of boundary, it is possible to detect the rate at which colloidal particles migrate in an electric field.
It is generally expressed in terms of electrophoretic mobility (\(\mu\)). It is defined as the distance traveled by the particle in one second under a potential gradient of one volt per cm. Electrophoresis is used for the separation of proteins, nucleic acids, Polysaccharides etc. Zeta potential (\(\zeta\)) and electrophoretic mobility (\(\mu\)) are related by the equation. $$ \zeta = \frac { 4\pi \eta \mu }{ D } $$Where \(\eta\) = viscosity of the medium and D = dielectric constant of the medium
- Write a short note on Electrical Double Layer (Helmholtz and Stern Models).
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- Explain Electro-osmosis with diagram?
5284 Views
- Explain Streaming potential.
4621 Views
- Explain Sedimentation potential? OR Explain Dorn Effect.
5426 Views
- Derive an equation for Donnan Membrane Equilibrium.
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Prof. Gianfranco Coletti
Shared publicly - 2019-08-23 00:00:00
Don’t want your columns to simply stack in some grid tiers? Use a combination of different classes for each tier as needed. See the example below for a better idea of how it all works.
Prof. Maheshwar Sharon
Shared publicly - 2019-08-24 00:00:00
For grids that are the same from the smallest of devices to the largest, use the .col and .col-* classes. Specify a numbered class when you need a particularly sized column; otherwise, feel free to stick to
sunil
Shared publicly - 2023-02-28 11:09:52
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Shared publicly - 2023-02-28 10:48:10
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