Alumina and silica gel are the two materials used in the stationary phase.
The different constituents of the mixture are known to have different affinities for the stationary phase. The different molecules stay shorter or longer on the stationary phase, depending on their interactions with its surface sites. The mixture is dissolved in a fluid which is called the mobile phase.
Stationary phase, is the phase over which the mobile phase is passed in the technique of chromatography. The stationary phase is a porous solid that is packed into a metal or glass tube.
Chromatography is based on the concept of separating molecules in a mixture added to the ground or solid and liquid stationary state when travelling with the aid of a mobile phase.
