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Ohne Zusammenfassung 相似文献
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Vandenbroucke Arne M. Aerts Robby Van Gaens Wouter De Geyter Nathalie Leys Christophe Morent Rino Bogaerts Annemie 《Plasma Chemistry and Plasma Processing》2015,35(1):217-230
Plasma Chemistry and Plasma Processing - In this work, we study the abatement of dilute trichloroethylene (TCE) in air with a negative direct current corona discharge. A numerical model is used to... 相似文献
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A. Leys und M. Kubli 《Fresenius' Journal of Analytical Chemistry》1900,39(6):372-373
Ohne Zusammenfassung 相似文献
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Leys FE Amovilli C March NH 《Journal of chemical information and computer sciences》2004,44(1):122-135
After a brief discussion of the structural trends which appear with an increasing number of atoms in B cages, a one-to one correspondence between the connectivity of B cages and C cage structures will be proposed. The electronic level spectra of both systems from Hartree-Fock calculations is given and discussed. The relation of curvature introduced into an originally planar graphitic fragment to pentagonal "defects" such as are present in buckminsterfullerene is also briefly treated. A study of the structure and electronic properties of B nanotubes will then be introduced. We start by presenting a solution of the free-electron network approach for a "model boron" planar lattice with local coordination number 6. In particular the dispersion relation E(k) for the pi-electron bands, together with the corresponding electronic Density Of States (DOS), will be exhibited. This is then used within the zone-folding scheme to obtain information about the electronic DOS of different nanotubes obtained by folding this model boron sheet. To obtain the self-consistent potential in which the valence electrons move in a nanotube, "the March model" in its original form was invoked, and the results are reported for a carbon nanotube. Finally, heterostructures, such as BN cages and fluorinated buckminsterfullerene, will be briefly treated, the new feature here being electronegativity difference. 相似文献
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Tinneke Jacobs Rino Morent Nathalie De Geyter Peter Dubruel Christophe Leys 《Plasma Chemistry and Plasma Processing》2012,32(5):1039-1073
Polymers are commonly used in industry because of their excellent bulk properties, such as strength and good resistance to chemicals. Their surface properties are for most application inadequate due to their low surface energy. A surface modification is often needed, and plasma surface modification is used with success the past decades. In the past few years, also plasma surface modification for biomedical polymers has been investigated. For biomedical polymers, the surface properties need to be altered to promote a good cell adhesion, growth and proliferation and to make them suitable for implants and tissue engineering scaffolds. This review gives an overview of the use of plasma surface modification of biomedical polymers and the influence on cell-material interactions. First, an introduction on cell-material interaction and on antibacterial and antifouling surfaces will be given. Also, different plasma modifying techniques used for polymer surface modification will be discussed. Then, an overview of literature on plasma surface modification of biopolymers and the resulting influence on cell-material interaction will be given. After an overview of plasma treatment for improved cell-material interaction, plasma polymerization and plasma grafting techniques will be discussed. Some more specialized applications will be also presented: the treatment of 3D scaffolds for tissue engineering and the spatial control of cell adhesion. Antibacterial and antifouling properties, obtained by plasma techniques, will be discussed. An overview of research dealing with antibacterial surfaces created by plasma techniques will be given, antifouling surfaces will be discussed, and how blood compatibility can be improved by preventing protein adhesion. 相似文献
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R.R. Lieten O. Richard S. Degroote M. Leys H. Bender G. Borghs 《Journal of Crystal Growth》2011,314(1):71-75
Early efforts to grow GaN layers on germanium substrates by plasma assisted molecular beam epitaxy led to GaN domains, rotated by 8° relative to each other. Increased insight in the growth of GaN on germanium resulted in the suppression of these domain and consequently high quality layers. In this study the interface of these improved layers is investigated with transmission electron microscopy. The GaN layers show high crystal quality and an atomically abrupt interface with the Ge substrate. A thin, single crystalline Ge3N4 layer is observed in between the GaN layer and Ge substrate. This Ge3N4 layer remains present even at growth temperatures (850 °C) far above the decomposition temperature of Ge3N4 in vacuum (600 °C). Triangular voids in the Ge substrate are observed after growth. Reducing the Ga flux at the onset of GaN growth helps to reduce the triangular defect size. This indicates that the formation of voids in the Ge substrate strongly depends on the presence of Ga atoms at the onset of growth. However complete elimination was not achieved. The formation of voids in the germanium substrate leads to diffusion of Ge into the GaN layer. Therefore we examined the diffusion of Ge atoms into the GaN layer and Ga atoms into the Ge substrate. It was found that the diffusion of Ge into the GaN layer and Ga into the Ge substrate can be influenced by the growth temperature but cannot be completely suppressed. Our results suggest that Ga atoms diffuse through small imperfections in the Ge3N4 interlayer and locally etch the Ge substrate, leading to the diffusion of Ga and Ge atoms. 相似文献
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R. Morent N. De Geyter M. Trentesaux L. Gengembre P. Dubruel C. Leys E. Payen 《Plasma Chemistry and Plasma Processing》2010,30(4):525-536
The effect of a plasma treatment on polymers is not permanent, since the treated surfaces tend to recover to the untreated
state (ageing process). This paper investigates the influence of discharge atmosphere on the ageing behaviour of plasma-treated
PLA foils: these foils are plasma-treated with a DBD in 4 different atmospheres (air, nitrogen, argon and helium) and are
subsequently stored in air. Results of contact angle and XPS measurements show that the discharge gas has a significant influence
on the ageing behaviour of the PLA foils. This influence can be explained by the different cross-linking degree of the plasma-treated
surfaces: helium and argon plasma-treated PLA films have a high cross-linking degree, which limits polymer chain mobility
and as a result reduces the ageing process. In contrast, the ageing behaviour of air and nitrogen plasma-treated films is
more pronounced due to their low cross-linking degree. 相似文献