المؤلفون: Farias, Carlos Eduardo, Bianchi, José Carlos, Oliveira, Paulo Roberto de, Borges, Paulo César, Bernardelli, Euclides Alexandre, Belmonte, Thierry, Mafra, Márcio

المصدر: Materials Research. October 2014 17(5)

مصطلحات موضوعية: plasma cleaning, etching, stearic acid

الوصف: Plasma cleaning is a promising technology in surface treatments, despite technological interest its use is limited because its mechanisms still are not entirely understood. This work aims to evaluate how the applied power of an inductively coupled RF discharge at 13,56 MHz, with Ar and Ar+10%O2 atmospheres, affects its capabilities to etch an organic molecule. Mass variation rate was used as direct characterization of degradation process and attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR) was performed to search for residual molecular modifications. Additionally, optical emission spectroscopy (OES) measurements were performed to monitor the offer of active species in the gaseous volume. In experimental conditions was possible attain mass reduction from sample, with higher mass loss rate when applied power is increased. Material characterization shows the possibility of attain a high etch rate, while no structural modifications were detected, if the temperature is controlled.

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الوصول الحر: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392014000500018Test

المؤلفون: Bernardelli, Euclides Alexandre, Mafra, Marcio, Maliska, Ana Maria, Belmonte, Thierry, Klein, Aloisio Nelmo

المصدر: Materials Research. April 2013 16(2)

مصطلحات موضوعية: stearic acid, DC discharge, post-discharge, grafting, etching, plasma cleaning

الوصف: In this work, stearic acid (SA) was degraded in an Ar-O2and Ar-H2post-discharge environment created by a plasma reactor with a microwave source and in an Ar, Ar-H2and Ar-O2DC (Direct Current) discharge environment created in a cathode-anode confined system. The afterglow region is useful for understanding the role of the chemically active species (O, O2, H and H2). In contrast, the discharge region allows the observation of the effects of chemically active species, charged species (ions and electrons) and photons. The influence of these species on the grafting and etching of SA was evaluated by measuring the mass variation, mass variation rate and chemical composition. The results showed that when only chemically active oxygen species are present, the SA is preferentially grafted. However, when both photons and charged species are present, the SA is more efficiently etched. When the Ar-H2and Ar environments are utilized; the SA is not efficiently degraded.

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الوصول الحر: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392013000200015Test

المؤلفون: Bernardelli, Euclides Alexandre, Souza, Thiago, Mafra, Márcio, Maliska, Ana Maria, Belmonte, Thierry, Klein, Aloisio Nelmo

المصدر: Materials Research. December 2011 14(4)

مصطلحات موضوعية: stearic acid, grafting, etching, cleaning by plasma

الوصف: Stearic acid (CH3(CH2)16COOH) was treated with Ar and Ar-O2 (10%) pulsed DC discharges created by a cathode-anode confined system to elucidate the role of oxygen in plasma cleaning. The treatment time (5 to 120 minutes) and plasma gas mixture (Ar and Ar-O2) were varied, and the results showed that the mass variation of stearic acid after Ar-O2 plasma exposure was greater than that of pure Ar plasma treatment. Thus, compared to Ar*, active oxygen species (O and O2, in all states) enhance the etching process, regardless of their concentration. During the treatments, a liquid phase developed at the melting temperature of stearic acid, and differential thermal analyses showed that the formation of a liquid phase was associated with the breakage of bonds due to treatment with an Ar or Ar-O2 plasma. After treatment with Ar and Ar-O2 plasmas, the sample surface was significantly modified, especially when Ar-O2 was utilized. The role of oxygen in the treatment process is to break carbonaceous chains by forming oxidized products and/or to act as a barrier again ramification, which accelerates the etching of stearic acid.

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الوصول الحر: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392011000400016Test

المؤلفون: Belmonte, T.¹ thierry.belmonte@ijl.nancy-universite.fr, Bernardelli, E.A.^1,2, Mafra, M.^1,2, Duday, D.³, Frache, G.³, Poncin-Epaillard, F.⁴, Noël, C.¹, Choquet, P.³, Migeon, H.-N.³, Maliska, A.M.²

المصدر: Surface & Coatings Technology. Jul2011 Supplement 2, Vol. 205, pS443-S446. 0p.

مصطلحات موضوعية: *STEARIC acid, *ALKANES, *ARGON, *AFTERGLOW (Physics), *DIFFUSION, *OXYGEN, *VISCOSITY, *PLASMA gases

مستخلص: Abstract: The transformations undergone in a late Ar―O2 afterglow by the hexatriacontane, a long chain alkane, and the stearic acid, a C18 alkane skeleton with an acid function, are compared. The diffusion of molecular oxygen is found to be the limiting step in the case of the HTC. When the SA is treated, this process is fast, likely because of the high diffusion coefficient of O2 in the SA than in the HTC. Desorption of OH groups produced by the abstraction of one hydrogen from the alkane skeleton by an oxygen atom is proposed as the limiting step. The fragmentation process stands in the core of the material and creates by-products that are responsible for the appearance of bubbles whose mobility and coarsening depend on the viscosity of the treated material. Finally, by resorting to pulse mode, both the HTC and the SA can be etched whereas they are functionalized in the continuous mode where non-linear behaviours are observed. [Copyright &y& Elsevier]