Coating efficiency evaluation

Coating efficiency. A metric for evaluating column quality. The minimum theoretical plate height divided by the observed plate height ... 

Collection Efficiency. Single-Tube Denuders. For the appropriate design of a diffusion-based collection device for an intended application, the ability to estimate the collection efficiency a priori is of considerable help. Although the theoretical soundness of the Gormley-Kennedy equation (equation 1) is not questioned, it is based on the assumption that the uptake probability of the analyte gas at the wall is unity that is, the wall is truly a perfect sink , and every collision results in uptake. This assumption is unrealistic. In recent years, this issue has been reexamined. McMurry and Stolzenburg (42) showed for a liquid-coated denuder how the uptake probability (discussed by the authors in terms of the mass accommodation coefficient ) can be evaluated from collection efficiency measurements. Murphy and Fahey (43) utilized the mathematical solution originally developed for hemodialyzers by Cooney et al. (44) this treatment assumes a constant uptake probability that may be less than unity. To use the Murphy-Fahey approach, however, this probability must be precisely known. 

More recently, Kaneco et al. evaluated Pb, Ag, Au, Pd, Cu, and Ni sputter-coated p-InP electrodes [115], Whilst the onset potentials for C02 reduction were less negative than those observed at the corresponding metal electrodes, the authors chose an extremely negative potential of-2.55 V (versus SCE) for their studies. By using a LiOH/methanol electrolyte, they examined the dependence of the amount of metal deposited on the current efficiency of C02 reduction, where the main... 

Magnetic beads (50 nm) were used in a PC chip to fractionate E. coli cells (K12) from sheep blood cells. A biotinylated rabbit polyclonal anti-E. coli antibody was first attached to the magnetic beads coated with streptavidin. Then E. coli became attached to the beads and was retained by the magnetic field. On the other hand, the other non-retained blood cells were washed away. The cell capture efficiency was evaluated after subsequent PCR of E. coli DNA [227]. 

Carr and others have described the preparation and properties of polybutadiene (PBD) and polyethyleneimine (PEI), as well as aromatic polymer-coated and carbon-clad zirconia-based RP phases. The preparation of PBD-coated zirconia and the chromatographic evaluation of these phases have been described extensively by Carr, McNeff, and others [39 1]. From these studies, the authors conclude that at least for neutral analytes PBD zirconia-coated phases behave quite similar with respect to retention and efficiency compared to silica-based RP phases [42]. For polar and ionic analytes, however, substantial differences with respect to retention, selectivity, and efficiency have been reported [43]. 

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