Liquid deposition techniques concentration

Endres et al. [82] have demonstrated the suitability of an air- and water-stable ionic liquid for the electropolymerization of benzene. This synthesis is normally restricted to media such as concentrated sulfuric acid, liquid SO2 or liquid HF as the solution must be completely anhydrous. The ionic liquid used, l-hexyl-3-methylimidazolium tris(pentafluoroethyl)trifluorophosphate, can be dried to below 3 ppm water, and this ionic liquid is also exceptionally stable, particularly in the anodic regime. Using this ionic liquid, poly(para-phenylene) was successfully deposited onto platinum as a coherent, electroactive film. Electrochemical quartz crystal microbalance techniques were also used to study the deposition and redox behavior of the polymer from this ionic liquid (Section 7.4.1) [83]. 

In the MAI.DI technique, a low concentration of the analyte is uniformly dispersed in a solid or liquid matrix deposited on the end of a stainless steel probe or placed on a metal plate. The plate is then placed in a vacuun chamber and a laser beam is focused onto the sample. In addition to the usual vacuum-chamber MALDI. atmospheric-pressure MAI.DI has also been de-.scribed. The MAI.DI matrix tnusi strongly absorb the laser radiation. The matrix and analyte are then do-... 

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