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E. A. Bernardelli T. Belmonte D. Duday G. Frache F. Poncin-Epaillard C. Noël P. Choquet H.-N. Migeon A. Maliska 《Plasma Chemistry and Plasma Processing》2011,31(1):189-203
We study the interaction of thick films (~4 mm) of stearic acid (SA), a C18 alkane skeleton with an acid function, with late Ar–O2 post-discharge. Contrary to what is observed with thin films of SA (~2–3 μm) which are efficiently etched (part I), only functionalization is observed over the first 2 h of treatment with a plasma source operated in the continuous mode,
whatever the temperature. The heat released by surface reactions affects non-linearly the temperature of the substrate. Pulsing
the source at a frequency ranging from 0.1 to 1 kHz slows down the functionalization process but does not allow any etching
of the material. On the contrary, the SA can be etched as thick films by pulsing the oxygen flow rate at a frequency below
50 mHz. By pulsing the reactive gas, the time averaged value of the [O]/[O2] ratio is decreased, limiting the functionalization processes due to oxygen atoms, and the mean temperature is lowered, decreasing
the diffusion length of O2 (and/or possibly O2*) species in the SA which are responsible for the scission of C–C bonds of radicals. 相似文献
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