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It was Martin and Synge who suggested the replacement of the liquid mobile phase in LLC with a gas. As indicated above, the stationary phase is a liquid immobilized on a support (inert silica particles for packed columns, inner wall of the column for capillary molecules) generally by grafting. Most often used for molecules in solution, the sample must be brought to its vapour state beforehand or at the time of its introduction. Therefore, this technique can be used for compounds whose boiling points are not very high, as well as for compounds which have been subject to a prior pyrolysis stage.