Surface topography and wetting modifications of PEEK for implant applications

Akkan, Cağrı Kaan; Hammadeh, Mohamad Eid; May, Alexander; Park, Hai-Woong; Abdul‐Khaliq, Hashim; Strunskus, Thomas; Aktas, Oral Cenk

doi:10.1007/s10103-014-1567-7

Cited by 48 publications

(37 citation statements)

References 26 publications

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“…As can be clearly seen in Figure a, a dramatic change in the color of the PA12 powder was observed as the pristine PA12 powder is white and becomes light brown after a 1 h exposure, and a darker brown after 2 h. The treated and nontreated powders were also pressed into solid discs with the disc surface displaying a uniform color which reveals that only fewer powder particles were not well‐exposed (see Figure b). Activated atoms and molecules in the electric field during plasma exposure react with the modified surface, creating new oxygenated groups and new chemical functionalities …”

Section: Resultsmentioning

confidence: 99%

“…Plasma‐ a reactive medium containing free electrons, excited and ionized atoms and molecules, radicals, and metastables and VIS‐UV radiation is widely applied also for chemically modification of polymer surfaces, e.g., ultrafine cleaning, functionalization, etching, or thin film deposition . Atmospheric pressure plasma jets are used to improve the wettability and adhesion, as is low pressure plasma . Both of these techniques are investigated in this work, although the plasma jet, can be expected to have an advantage that it is more economical than the low pressure ones requiring a vacuum chamber .…”

Section: Introductionmentioning

confidence: 99%

“…For this purpose, an advanced characterization of chemical properties is required in correlation to plasma process settings (gas, pressure, excitation frequency, power). Different gases or gas mixtures for example, Argon or Fluorine based plasmas such as CF 4 and oxygen gas plasma, are used for the surface hydrophilisation or hydrophobisation of polymers . Plasma based technique is a common way but not the only method, other types of methods like grafting or electron beam irradiation can also be used to manipulate the surface properties of materials …”

Section: Introductionmentioning

confidence: 99%

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Surface modification of the laser sintering standard powder polyamide 12 by plasma treatments

Almansoori

Masters

Abrams

et al. 2018

Plasma Processes & Polymers

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Polyamide 12 (PA12) powder was exposed for up to 3 h to low pressure air plasma treatment (LP‐PT) and several minutes by two different atmospheric pressure plasma jets (APPJ) i.e., kINPen (K‐APPJ) and Hairline (H‐APPJ). The chemical and physical changes resulting from LP‐PT were observed by a combination of Scanning Electron Microscopy (SEM), Hot Stage Microscopy (HSM) and Fourier transform infrared spectroscopy (FTIR), which demonstrated significant changes between the plasma treated and untreated PA12 powders. PA12 exposed to LP‐PT showed an increase in wettability, was relatively porous, and possessed a higher density, which resulted from the surface functionalization and materials removal during the plasma exposure. However, it showed poor melt behavior under heating conditions typical for Laser Sintering. In contrast, brief PJ treatments demonstrated similar changes in porosity, but crucially, retained the favorable melt characteristics of PA12 powder.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Surface modification of the laser sintering standard powder polyamide 12 by plasma treatments

Almansoori

Masters

Abrams

et al. 2018

Plasma Processes & Polymers

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show abstract

“…Plasma processes can be used to modify polymer surfaces for adhesion enhancement by introducing new reactive chemical groups and/or roughening the surfaces 14,15 . and the mechanical ones so-called anchoring or interlocking mechanism for which roughness is required.…”

Section: Introductionmentioning

confidence: 99%

Plasma functionalization and etching for enhancing metal adhesion onto polymeric substrates

et al. 2015

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The metallization of plastics materials, dealing with a lot of industrial applications in the field of automotive, electronic, etc…, is generally performed by a chemical and/or electrochemical process not so ecofriendly. Therefore, this paper aims at studying an innovative two-step process for such metal coating onto ABS, ABS/PC and PEEK polymers. The first step corresponds to the plasma treatment improving the surface wettability and surface roughness. The second step is associated with the deposition of the copper metallic film by cathodic magnetron sputtering. Metallic adhesion is discussed in function of these two plasma-effects but also in function of the bias voltage or temperature substrate-holder during the film deposition. Moreover, the use of a titanium thin film as a primary layer, before copper deposition, has led to an increase of the metal/polymer adhesion.

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“…Therefore, it is of great significance to develop a new type of coronary stent, which has low restenosis rate and can prevent late stent thrombosis. In recent years, the studies show that the biocompatibility of the materials could be increased by the biomimetic process of surface and coating [3][4][5][6][7][8] . Consequently, the preparing bionic surface with regular geometric structure is beneficial to the rapid, directional and orderly adhesion and the growth of endothelial cells, which can reduce the formation of restenosis and late thrombosis.…”

mentioning

confidence: 99%

Fabrication of hydrophobic structures on coronary stent surface based on direct three-beam laser interference lithography

Gao

Zhou

Wang

et al. 2016

Optoelectron. Lett.

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To solve the problems with coronary stent implantation, coronary artery stent surface was directly modified by three-beam laser interference lithography through imitating the water-repellent surface of lotus leaf, and uniform micro-nano structures with the controllable period were fabricated. The morphological properties and contact angle (CA) of the microstructure were measured by scanning electron microscope (SEM) and CA system. The water repellency of stent was also evaluated by the contact and then separation between the water drop and the stent. The results show that the close-packed concave structure with the period of about 12 µm can be fabricated on the stent surface with special parameters (incident angle of 3°, laser energy density of 2.2 J·cm -2 and exposure time of 80 s) by using the three-beam laser at 1 064 nm, and the structure has good water repellency with CA of 120°.The coronary artery stent implantation has become the first choice for the treatment of coronary heart disease (CHD) in the world currently. Although the equipment and medication are increasingly improved, in-stent restenosis (ISR) is still a major defect of stent implantation [1] . Due to the occurrence of restenosis, still more than 15% patients with coronary stent implantation will accept interventional therapy in a year [2] . Therefore, it is of great significance to develop a new type of coronary stent, which has low restenosis rate and can prevent late stent thrombosis. In recent years, the studies show that the biocompatibility of the materials could be increased by the biomimetic process of surface and coating [3][4][5][6][7][8] . Consequently, the preparing bionic surface with regular geometric structure is beneficial to the rapid, directional and orderly adhesion and the growth of endothelial cells, which can reduce the formation of restenosis and late thrombosis.Laser interference lithography (LIL) has been applied in many fields, such as solar cells [9,10] , nano-scale patterned sapphire substrate [11] and bionics [12,13] . And studies have shown that the minimum feature size of direct LIL can reach 27 nm (laser wavelength of 308 nm, pulse width no more than 10 ns) [14] , which can fully meet the requirements of the process in this paper. Compared with other approaches, such as electron beam lithography, ion beam lithography and scanning probe lithography, which adopt the point by point writing strategy [15,16] , LIL reduces the required processing time by using multi-beam simultaneously. In addition, the long focal depth and the maskless process of LIL lower the flatness requirements of substrate and can realize imaging on a non-planar surface without affecting the resolution and image contrast.In this paper, LIL is used to modify the surface of coronary stent by imitating the water-repellent surface of lotus leaf. Test results show that the processed stent has good water repellency, which can achieve the desired effects.LIL is very suitable to process the coronary stent with the structure of mesh tubes, as shown in Fig....

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Surface topography and wetting modifications of PEEK for implant applications

Cited by 48 publications

References 26 publications

Surface modification of the laser sintering standard powder polyamide 12 by plasma treatments

Surface modification of the laser sintering standard powder polyamide 12 by plasma treatments

Plasma functionalization and etching for enhancing metal adhesion onto polymeric substrates

Fabrication of hydrophobic structures on coronary stent surface based on direct three-beam laser interference lithography

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