Mechanically Blended Silica-Based Bonded Phases. Application of the Simple Modulation of the Polarity of the Stationary Phase to T. L. C

A mixture of polycyclic aromatic hydrocarbons and azaarenes was used to test C 18 /cyano mixed phases prepared by mechanical mixing of silica-based bonded phases for one-dimensional T.L.C. It was shown that for a normal phase polarity mechanism, the modulation in polarity of the stationary phase, obtained by simple variation of the percentage of the cyano phase, contributed to an improvement in the resolution of the mixture.