Adsorption of ammonia on treated stainless steel and polymer surfaces
作者： O. Vaittinen , M. Metsälä , S. Persijn , M. Vainio , L. Halonen
DOI: 10.1007/S00340-013-5590-3
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摘要: Adsorption of dynamically diluted ammonia at part-per-billion to low part-per-million concentrations in dry nitrogen was studied with treated and non-treated stainless steel polymer test tubes. The treatments included electropolishing two types coatings based on amorphous silicon. Cavity ring-down spectroscopy an external cavity diode laser operating the near-infrared wavelength range used monitor adsorption process real time continuous-flow conditions obtain quantitative assessment adsorptive properties surfaces. investigated polymers were all less than any or Some commercial reduced loss by a factor ten more. Polyvinylidene fluoride found be superior (less adsorption) four other coatings. number adsorbed molecules per surface area obtained different gas phase modeled Langmuir Freundlich isotherms. behavior adsorption–desorption occurring scale seconds minutes simulated simple kinetic model.
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