Irreversible and reversible phase transitions of alkyl monolayers. Gas chromatographic evidence of polar solvent influence on the adsorbing properties of the layer |
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Authors: | D Morel J Serpinet G Untz |
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Institution: | (1) Laboratoire de Chimie Analytique 3, Université Claude Bernard, Lyon I, 69622 Villeurbanne Cedex, France;(2) Oxysynthèse, 38560 Jarrie, France |
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Abstract: | Summary Further to Gilpin's observations in liquid chromatography of the irreversible transformation of alkyl grafts, following the replacement of an organic mobile phase by an aqueous one, we describe some gas chromatographic experiments which lead to similar (log Vs, I/T) plots, as a consequence of the same solvent release process.We use paraffin films on siliceous supports or hydroxylated liquid substrates or C22-alkyl bonded silica. These experiments demonstrate that this irreversible transition and the melting-like reversible transition are completely different phenomena. They confirm the existence of at least three kinds of monomeric alkyl films. |
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Keywords: | RP-HPLC and GC Bonded phase structure Phase transition Normal paraffin films Inverse gas chromatography |
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