Oxygen purging

Figure 10.3 Fluorescence emission spectra of green sensor (Gr) (A) Rose Bengal (RB) (B) and a mixture of both on (C) glass, (D) SiFs, (E) in cuvette, (F) on SiFs nitrogen purged, (G) on SiFs oxygen purged, (H) on 50 nm thick Ag, before and after light exposure (2 min) at room temperature. Light source is 100 W mercury lamp. Xex = 473nm. Adopted from ref [25]...

The monomers were charged into the autoclave, and trace amounts of oxygen purged by the freeze-thaw technique. Irradiation was carried out with gamma rays from a (50Co source at various temperatures. CHC13, CH2C12, dimethylformamide (DMF), triethylamime (TEA), and p-benzoquinone were used as additives in the polymerization systems. Viscosity of the copolymers obtained was measured in Freon 113 at 35°C. Infrared spectra and x-ray diffraction patterns of the sample were also obtained. NMR measurements of (proton and fluorine) were also done. 

In polarographic analysis, the dissolved oxygen forms two waves that overwhelm the signal from the trace metals present in the solution. How is the oxygen purged ... 

Fig. 15.6 RRDE measurements of oxygen reduction reactions on four Ag/C catalysts with different metal loadings, Vulcan XC-72, and 20 wt.% Pt/C (BASF) with a rotation rate of2,500rpm in oxygen-purged 0.1 M NaOH. Collection efficiency N = 0.23 ring potential , = 0.3 V versus Hg/HgO scan rate 20 mV s [37]...

Question by W. Jenkins, U. S. Industrial Chemicals In an air separation plant where the oxygen purging is intermittent, is there any chance of the combustible accumulation of hydrocarbons These hydrocarbons would be back-diffused from a contaminated atmosphere. 

Fig. 6.13 Transient spectra recorded for dyad 25 in acetonitrile after 532 nm laser excitation of nitrogen purging (a, 0.5 and 1.5 ps) or oxygen purging (b, 1 ps). The inset shows the temporal decay of the signal monitored at 350 nm for the nitrogen black) and oxygen red) purged dyad 25 in solution. Reprinted with permission from [27]...

Fig. 47 In situ UV-Vis spectral changes of octa-TiPc in DCM-TBAP electrolyte without molecular oxygen (purged with N2) a...

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