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  • 1
    Electronic Resource
    Electronic Resource
    On the effect of low-energy ion bombardment on polystyrene and polymethylmethacrylate etch rates in rf plasmas (1989)
    Springer
    Plasma chemistry and plasma processing 9 (1989), S. 3-12 
    Details
    ISSN: 1572-8986
    Keywords: Etching ; polystyrene ; polymethylmethacrylate ; ion bombardment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract The effect of low-energy ion bombardment on CD4/O2 and CF3X (X=F, Cl, Br) plasma etching has been assessed by applying controlled rf bias voltages on polystyrene (PS) and polymethylmethacrylate (PMMA) samples. In both cases ion bombardment has been found to have a “chemical” effect. In the case of CF4/O2 discharges, ion bombardment has been found to change the relative etching efficiency of different mixtures. In the case of CF3X plasmas, ion bombardment has been found to alter PMMA and PS etch rates in a different way. In particular, the ratios between CF4 and CF3X (X=Cl, Br) etch rates of PS have been found to decrease with increasing bias voltage. This effect has been tentatively attributed to an ion bombardment-induced enhancement of the reaction between the aromatic ring and halogen molecules formed in CF3Cl and CF3Br discharges.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01015823
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  • 2
    Electronic Resource
    Electronic Resource
    The wetting behavior of grafted hydrophilic acrylic monomers (1993)
    Springer
    Colloid & polymer science 271 (1993), S. 696-704 
    Details
    ISSN: 1435-1536
    Keywords: Wettability ; dynamic contact angle ; UV grafting ; hydrophilic surfaces
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The wetting behavior of vapor phase photografted hydrophilic acrylic monomers was evaluated by the three most commonly employed techniques, i.e., the captive bubble, the sessile drop, and the Wilhelmy plate technique. The measured contact angles and the overall wetting behavior were discussed in light of the non-ideal nature of these surfaces. It was found that the peculiar nature of hydrophilic grafted surfaces is carefully reflected in the experimentally measurable contact angles. While in the case of the captive bubble the hydrophilic and rough nature of these coatings prevent the bubble-surface contact, in the case of the sessile drop the measured contact angles follow the behavior predicted by contact angle hysteresis theories. Wilhelmy plate measurements, performed as sequential scanning loops, show velocity-dependent effects which are linked to the composition, morphology and mobility of the grafted surfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00652832
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