SummatvThecomposition of the mobile phaseemployed in capillary zone electrophoresis and the related technique, micellar electrokinetic capillary chromatography, is an important factor in determining separation performance. The influences of ionic salt, surfactant, and organic solvent mobile phase additives on separation efficiency, retention, and elution range are discussed and demonstrated.
The oxyacetylene torch facility is used to measure the ablation rates of graphite and the surface temperatures of different aerospace materials. The free-stream flame environment is characterized as a function of flame chemistry for heat flux, pO 2 , and flow velocity. Measured ablation rates for graphite increase as a function of increasing heat flux and pO 2 , which are validated by applying an oxygen diffusion based model. The model uses experimentally measured values for temperature, pO 2 , and gas velocity in order to confirm torch testing results are reliable and reproducible. Surface temperatures of ultra-high temperature ceramic composites are measured as a function of increasing heat flux and show an enthalpic cooling effect on the flame during oxidation testing.
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