Adhesion and proliferation of human endothelial cells on photochemically modified polytetrafluoroethylene

Gumpenberger, Thomas; Heitz, J.; Bäuerle, D.; Kahr, Heike; Graz, Ingrid; Romanin, Christoph; Švorčı́k, Václav; Leisch, F

doi:10.1016/s0142-9612(03)00460-5

Cited by 83 publications

(55 citation statements)

References 19 publications

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“…1. It can be noticed that the density is of the order of 1-10 % of the atmospheric density and is similar to NH 3 gas density employed in experiments performed using an excimer lamp for polymer irradiation [4]. Irradiation of N 2 , injected into the interaction region, by EUV photons results in ionization and excitation of the gas.…”

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confidence: 58%

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Simultaneous treatment of polymer surface by EUV radiation and ionized nitrogen

et al. 2012

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In this paper chemical modification of a poly(vinylidene fluoride) surface by extreme ultraviolet (EUV) irradiation in a presence of ionized nitrogen was demonstrated for the first time. Nitrogen gas, injected into an interaction region, was ionized and excited by the EUV radiation from a laser-plasma source. The ionization degree and excited states of nitrogen were investigated using EUV spectrometry and the corresponding spectra are presented. Chemical mod- ification of polymer after combined EUV and ionized nitrogen treatment was investigated using X-ray photoelectron spectroscopy. A significant contribution of nitrogen atoms in near-surface layer of the polymer after the treatment was demonstrated.Polymers are widely used in industry because of good mechanical properties and their resistance to environmental factors. For some applications, however, surface properties of polymers must be modified. The modification may concern hydrophobicity, wettability, adsorption, adhesion, optical or other surface properties and is associated with some changes in physicochemical structure of the near-surface layer. Different methods can be employed for surface structuring, including chemical [1], plasma [2], or radiation treatment. In the last case, ultraviolet (UV) lamps or UV lasers are mainly used [3][4][5]. Photons emitted from these sources can excite electrons from the valence band of polymer materials. Molecular electronic structure of the materials has some resonances, hence, excitation rate depends on energy of the irradiating photons and strongly influences the absorption depth. The excited states can relax through radiative or non-radiative processes. In case of polymers one of the possible radiationless channels corresponds to bond breaking of the polymer chain. This can result in formation of volatile fractions or in changes in chemical structure and composition of the polymer molecules. Some volatile fractions are released from irradiated layer resulting in smooth ablation or modification of the surface morphology due to a preferential dry etching of an amorphous polymer. For some applications incorporation of some functional groups into the polymer molecules is necessary. In such cases irradiation is being performed in a reactive atmosphere [4].

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supporting

confidence: 58%

“…For some applications incorporation of some functional groups into the polymer molecules is necessary. In such cases irradiation is being performed in a reactive atmosphere [4]. …”

mentioning

confidence: 99%

Simultaneous treatment of polymer surface by EUV radiation and ionized nitrogen

et al. 2012

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“…Appropriate modifications can be achieved by chemical [37], plasma [38], or radiation treatment. For the photo− −induced modification of polymers, excimer lamps or ex− cimer lasers are mainly used [39][40][41].…”

Section: Surface Treatmentmentioning

confidence: 99%

“…For some applications, however, incorporation of additional atoms or functional groups into the molecular structure is necessary. To attain such effect in case of using UV lasers the surface irradiation is being performed in a reactive atmo− sphere [40]. The author of the paper demonstrated a possi− bility of the EUV treatment in a presence of gases injected into the interaction region synchronously with the radiation pulses [48].…”

Section: Surface Treatmentmentioning

confidence: 99%

Laser-plasma extreme ultraviolet and soft X-ray sources based on a double stream gas puff target: interaction of the radiation pulses with matter

Bartnik

2015

Opto-Electronics Review

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In this work a review of investigations concerning interaction of intense extreme ultraviolet (EUV) and soft X-ray (SXR) pulses with matter is presented. The investigations were performed using laser-produced plasma (LPP) EUV/SXR sources based on a double stream gas puff target. The sources are equipped with dedicated collectors allowing for efficient focusing of the EUV/SXR radiation pulses. Intense radiation in a wide spectral range, as well as a quasi-monochromatic radiation can be produced. In the paper different kinds of LPP EUV/SXR sources developed in the Institute of Optoelectronics, Military University of Technology are described.Radiation intensities delivered by the sources are sufficient for different kinds of interaction experiments including EUV/SXR induced ablation, surface treatment, EUV fluorescence or photoionized plasma creation. A brief review of the main results concerning this kind of experiments performed by author of the paper are presented. However, since the LPP sources cannot compete with large scale X-ray sources like synchrotrons, free electron lasers or high energy density plasma sources, it was indicated that some investigations not requiring extreme irradiation parameters can be performed using the small scale installations. Some results, especially concerning low temperature photoionized plasmas are very unique and could be hardly obtained using the large facilities.

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“…Various methods are used for surface structuring, including chemical [1], plasma [2], or radiation treatment. For the latter one, ultraviolet (UV) lamps or UV lasers are usually employed [3][4][5]. Energy of UV photons is sufficient for excitation of valence electrons of polymers.…”

Section: Introductionmentioning

confidence: 99%

Surface Modification of Solids by Extreme Ultraviolet and Plasma Treatment

et al. 2018

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In this paper, results of surface modification, using a laser-produced plasma source of extreme ultraviolet, and the extreme ultraviolet induced low temperature plasmas, are presented. It was shown that irradiation of different materials by intense extreme ultraviolet pulses results in strong changes of the surface morphology. Examples of micro-and nanostructures obtained this way are presented. It was also demonstrated that a dual action of the radiation pulses and low temperature plasmas allows to modify a molecular structure of exposed materials.

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Adhesion and proliferation of human endothelial cells on photochemically modified polytetrafluoroethylene

Cited by 83 publications

References 19 publications

Simultaneous treatment of polymer surface by EUV radiation and ionized nitrogen

Simultaneous treatment of polymer surface by EUV radiation and ionized nitrogen

Laser-plasma extreme ultraviolet and soft X-ray sources based on a double stream gas puff target: interaction of the radiation pulses with matter

Surface Modification of Solids by Extreme Ultraviolet and Plasma Treatment

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