Untitled

Schröder, Karsten; Meyer‐Plath, Asmus; Keller, D.; Ohl, A.

doi:10.1023/a:1016239302194

Cited by 52 publications

(34 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[5] Many approaches have been proposed to improve the biocompatibility of this kind of surface, most of which involve coating the graft with proteins such as gelatine, [6] albumin, [7] or collagen [8] and subsequent chemical cross linking with glutaraldehyde or formaldehyde, [9] which may cause cytotoxic reactions. [10] It has been shown that the surface characteristics, such as wettability, roughness, chemistry, [11] surface charge, density of functional groups, [12] etc. play a crucial role in biocompatibility.…”

Section: Introductionmentioning

confidence: 99%

Surface modification of polyester by oxygen‐ and nitrogen‐plasma treatment

Vesel

Junkar

Cvelbar

et al. 2008

Surface & Interface Analysis

259

207

View full text Add to dashboard Cite

In this paper, we present a study on the surface modification of polyethyleneterephthalate (PET) polymer by plasma treatment. The samples were treated by nitrogen and oxygen plasma for different time periods between 3 and 90 s. The plasma was created by a radio frequency (RF) generator. The gas pressure was fixed at 75 Pa and the discharge power was set to 200 W. The samples were treated in the glow region, where the electrons temperature was about 4 eV, the positive ions density was about 2 × 10 15 m −3 , and the neutral atom density was about 4 × 10 21 m −3 for oxygen and 1 × 10 21 m −3 for nitrogen. The changes in surface morphology were observed by using atomic force microscopy (AFM). Surface wettability was determined by water contact angle measurements while the chemical composition of the surface was analyzed using XPS. The stability of functional groups on the polymer surface treated with plasma was monitored by XPS and wettability measurements in different time intervals. The oxygen-plasma-treated samples showed much more pronounced changes in the surface topography compared to those treated by nitrogen plasma. The contact angle of a water drop decreased from 75• for the untreated sample to 20• for oxygen and 25• for nitrogen-plasma-treated samples for 3 s. It kept decreasing with treatment time for both plasmas and reached about 10• for nitrogen plasma after 1 min of plasma treatment. For oxygen plasma, however, the contact angle kept decreasing even after a minute of plasma treatment and eventually fell below a few degrees. We found that the water contact angle increased linearly with the O/C ratio or N/C ratio in the case of oxygen or nitrogen plasma, respectively. Ageing effects of the plasma-treated surface were more pronounced in the first 3 days; however, the surface hydrophilicity was rather stable later.

show abstract

Section: Introductionmentioning

confidence: 99%

Surface modification of polyester by oxygen‐ and nitrogen‐plasma treatment

Vesel

Junkar

Cvelbar

et al. 2008

Surface & Interface Analysis

259

207

View full text Add to dashboard Cite

show abstract

Section: Sample Preparation and Analytical Equipmentmentioning

confidence: 96%

“…2,4,11 Also, the existence of well-defined geometrical features could be qualitatively demonstrated by fluorescence microscopy. 4 Here, polystyrene (PS) surfaces were first functionalized in an NH 3 . XPS measurements were performed using an XPS spectrometer (Axis Ultra, Kratos, Manchester, UK) in a standard configuration including a conventional hemispherical analyser, a monochromatized Al K˛source (1486.6 eV), and charge neutralization by low-energy electrons.…”

Section: Sample Preparation and Analytical Equipmentmentioning

confidence: 96%

See 1 more Smart Citation

Visualization of a plasma‐generated chemical micro‐pattern on polystyrene by XPS

Schröder

Babucke

Ohl

2004

Surface & Interface Analysis

View full text Add to dashboard Cite

Chemical microstructures on polymer surfaces are of increasing interest for biological applications. Here, the potential of high-resolution XPS (spatially as well as energetically) was investigated for characterization of these patterns. Chemical modifications obtained on non-patterned samples were compared to chemical contrasts inside the 30-200 µm wide patterns on polystyrene (PS).Chemical contrasts in micro-patterns down to 30 µm could be verified by small-spot XPS and imaging XPS. While features with typical dimensions of some hundred micrometres were reproduced with high contrasts and a chemical composition comparable to non-patterned samples, blurred information was found for spectroscopy as well as imaging of micro-patterns with typical dimensions less than 100 µm.

show abstract

“…Plasma processing meets all these requirements . Plasma-assisted chemical surface functionalization is a frequently-used processing step for the preparation of chemical micro patterns on polymeric surfaces (Schröder et al, 2002). Plasma processes were also applied for the treatment of interior surfaces of small trench structures (Besch et al, 2008) and for the creation of localized chemical structures for a cellbased high content screening system (Steffen et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

On the Application of Gas Discharge Plasmas for the Immobilization of Bioactive Molecules for Biomedical and Bioengineering Applications

Hempel¹

2011

Biomedical Engineering - Frontiers and Challenges

View full text Add to dashboard Cite

Untitled

Cited by 52 publications

References 14 publications

Surface modification of polyester by oxygen‐ and nitrogen‐plasma treatment

Surface modification of polyester by oxygen‐ and nitrogen‐plasma treatment

Visualization of a plasma‐generated chemical micro‐pattern on polystyrene by XPS

On the Application of Gas Discharge Plasmas for the Immobilization of Bioactive Molecules for Biomedical and Bioengineering Applications

Contact Info

Product

Resources

About