Deposition Of Polymeric Materials Research Articles

Plasma ion implantation to thin polymer foils

AbstractPlasma ion implantation and deposition of polymeric materials has gained substantial interest in recent years. This paper will present numerical results on initial potential on top surface and some examples on ion implantation of thin polymer foils. The results demonstrate that the thickness and permittivity of treated samples have a critical influence on initial potential drop across the insulating objects. The smaller thickness and larger permittivity are beneficial for ion implantation. Duplex films of Al2O3/SiO2 have been fabricated using arc plasma ion implantation and deposition. The films may substantially increase atomic‐oxygen resistance of Kapton foils, which have been frequently utilized in satellites in low‐earth‐orbit (LEO) environment. The mass loss of treated samples may decrease by one quarter of magnitude compared to that of control sample. The PET foils have also been implanted using C2H2 plasma ion implantation. The experimental results show that ion implantation may effectively enhance the gas barrier capability. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Indium tin oxide coated conducting glass electrode for electrochemical destruction of textile colorants

Galvanostatic oxidation of 5.0 × 10 −2 mM textile dyes such as Eosin Y (EY) and Orange II (Or II) was carried out on an indium tin oxide (ITO) coated glass anode in the presence of 1.0 × 10 −2 mM KCl solution at pH 4.0 and 6.0. The degradation results of EY were compared with that of highly stable azo dyes (Or II). EY dye solution with a concentration of 5.0 × 10 −2 mM is totally decolorized in 30 min at an electrical charge ( Q) 0.067 A h dm −3 while 5.0 × 10 −2 mM Or II degraded in a little less than an hour at the same electrical charge density. The decay kinetics of dyes follows a pseudo first-order reaction. The degradation of dyes is faster in acidic pH values than in basic pH values. Electrochemical degradation results show significant decrease in chemical oxygen demand (COD) values after electrodegradation of textile dyes. The key advantage of the ITO conducting glass anode is that the deposition of polymeric materials on the anode surface during electro-degradation of textile dyes is absent and therefore the electrode fouling is not observed. Hence, the ITO anodes can be employed an extended period without loss of activity.

‘Defence lignin’ and hydroxycinnamyl alcohol dehydrogenase activities in wounded Eucalyptus gunnii

‘Defence lignin’ and hydroxycinnamyl alcohol dehydrogenase activities in wounded <i>Eucalyptus gunnii</i>