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Plasma Immersion Ion Implantation (plasma + immersion_ion_implantation)

Distribution by Scientific Domains
Polymers and Materials Science80%

Selected Abstracts

Surface Structures and Osteoblast Activity on Biomedical Polytetrafluoroethylene Treated by Long-Pulse, High-Frequency Oxygen Plasma Immersion Ion Implantation

ADVANCED ENGINEERING MATERIALS, Issue 5 2010
Liping Tong
Abstract Polytetrafluoroethylene (PTFE) is a biologically safe polymer used widely in clinical medicine including oral and orthopedic surgery. However, the high bio-inertness of PTFE has hampered wider applications in the biomedical fields. In this work, we extend the treatment time in long-pulse, high-frequency oxygen plasma immersion ion implantation of PTFE and a more superhydrophobic surface with a water contact angle of 160° is created. X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) reveal that the optimized long-pulse, high-frequency oxygen plasma immersion ion implantation process induces a rougher surface and to a lesser extent alters the surface oxygen concentration on the PTFE. Our data, especially long-term contact angles, suggest that the superhydrophobility stems from surface roughness alteration. Furthermore, the activity of MC3T3-E1 osteoblasts cultured on the treated surfaces is promoted in terms of quantities and morphology. [source]

Silver nanocluster containing diamond like carbon

PHYSICA STATUS SOLIDI (A) APPLICATIONS AND MATERIALS SCIENCE, Issue 4 2008
F. Schwarz
Abstract Applying Diamond Like Carbon (DLC) as medical coating has become well established since large scale plasma processes like Plasma Immersion Ion Implantation and Deposition (PIII&D) are available. Now the focus of research lies on systematic modification of certain biological relevant properties and the most recent field of interest turned to generating antimicrobial behaviour. This is desirable for medical tools as well as for different types of medical implants. Since silver and copper are known to provide a bactericidal effect, one tries to introduce clusters of these noble metals into the carbon matrix. The basic principle of the method presented is to convert a metal containing polymer film into DLC by ion bombardment. In this paper the hydrogenated DLC matrix is characterized and the evolution of the metal particles is studied. By means of film composition (RBS/ERD), bonding structure (Raman spectroscopy) and hardness (nanoindentation), the dependency of these material properties on ion species, energy and fluence is investigated. TEM imaging is used to visualize the film structure. Upon ion irradiation of the polymer films, increased density and considerable loss of hydrogen can be observed, which both are controlled by ion fluence and mass. The crosslinking of the carbon network, caused by hydrogen drive out as well as atomic displacements in collision cascades, results in the formation of a-C:H. The silver particles in the film some ion induced growth, but still remain as nanoclusters in the a-C:H matrix. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

Surface Structures and Osteoblast Activity on Biomedical Polytetrafluoroethylene Treated by Long-Pulse, High-Frequency Oxygen Plasma Immersion Ion Implantation

ADVANCED ENGINEERING MATERIALS, Issue 5 2010
Liping Tong
Abstract Polytetrafluoroethylene (PTFE) is a biologically safe polymer used widely in clinical medicine including oral and orthopedic surgery. However, the high bio-inertness of PTFE has hampered wider applications in the biomedical fields. In this work, we extend the treatment time in long-pulse, high-frequency oxygen plasma immersion ion implantation of PTFE and a more superhydrophobic surface with a water contact angle of 160° is created. X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) reveal that the optimized long-pulse, high-frequency oxygen plasma immersion ion implantation process induces a rougher surface and to a lesser extent alters the surface oxygen concentration on the PTFE. Our data, especially long-term contact angles, suggest that the superhydrophobility stems from surface roughness alteration. Furthermore, the activity of MC3T3-E1 osteoblasts cultured on the treated surfaces is promoted in terms of quantities and morphology. [source]

Plasma-Treated Polyethylene Surfaces for Improved Binding of Active Protein

PLASMA PROCESSES AND POLYMERS, Issue 5 2007
Joan P. Y. Ho
Abstract The use of plasma immersion ion implantation (PIII) to prepare polyethylene surfaces for binding active proteins is investigated. The PIII surface treatment significantly improves the density of active HRP bound to the surface after incubation in buffer containing the protein. The retention of enzyme activity on the PIII-treated surfaces is greatly improved as compared to both untreated controls and surfaces exposed to the plasma without the PIII treatment. A nitrogen PIII treatment produced surfaces with the best retention of protein activity. Oxidation of the ion-damaged surface and the formation of a carbonized subsurface are believed to be responsible for the observed protein binding properties. [source]

Mechanical Surface Properties of CoCr Alloys After Nitrogen PIII

PLASMA PROCESSES AND POLYMERS, Issue S1 2007
Inga-Maria Eichentopf
Abstract Initial experiments were performed to improve the mechanical surface properties of CoCr alloys by nitrogen plasma immersion ion implantation (PIII). Fast thermally activated diffusion with an activation energy of 0.6 eV was observed. A detailed investigation of the phase formation by X-ray diffraction revealed a variable phase composition with CrN and Cr2N being dominating at higher temperatures and additional fcc phases being present. The hardness of the surface layer increased from about 300 HV by a factor of 3,5 while the wear rate was reduced by a factor of up to ten as a result of the PIII treatment. [source]