Effect of accelerating gas temperature on microstructure and properties of cold sprayed Al coating on polyether ether ketone (PEEK)

The aim of this work was to extend conventional medical implants by the possibility of communication between them. For reasons of data security and transmitting distances, this communication should be realized using ultrasound, which is generated and detected by capacitive micromachined ultrasonic transducers (CMUTs). These offer the advantage of an inherent high bandwidth and a high integration capability. To protect the surrounding tissue, it has to be encapsulated. In contrast to previous results of other research groups dealing with the encapsulation of CMUTs, the goal here is to integrate the CMUT into the housing of a medical implant. In this work, CMUTs were designed and fabricated for a center frequency of 2 MHz in water and experimentally tested on their characteristics for operation behind layers of Polyether ether ketone (PEEK) and titanium, two typical materials for the housings of medical implants. It could be shown that with silicone as a coupling layer it is possible to operate a CMUT behind the housing of an implant. Although it changes the characteristics of the CMUT, the setup is found to be well suited for communication between two transducers over a distance of at least 8 cm.

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Development of bioactive sodium alginate/sulfonated polyether ether ketone/hydroxyapatite nanocomposites: Synthesis and in-vitro studies

Carbohydrate Polymers ◽

10.1016/j.carbpol.2021.118236 ◽

2021 ◽

pp. 118236

Author(s):

Esmaeil Salimi

Keyword(s):

Sodium Alginate ◽

In Vitro Studies ◽

Polyether Ether Ketone ◽

Sulfonated Polyether Ether Ketone ◽

Ether Ketone

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Polyether Ether Ketone-Based Anion Exchange Membranes with Bis-imidazolium Cations for All-Vanadium Redox Flow Batteries

ACS Applied Energy Materials ◽

10.1021/acsaem.1c00887 ◽

2021 ◽

Author(s):

Song Yang ◽

Xufeng Chu ◽

Bing Xue ◽

Teng Lv ◽

Bencai Lin ◽

...

Keyword(s):

Anion Exchange ◽

Anion Exchange Membranes ◽

Imidazolium Cations ◽

Redox Flow Batteries ◽

Polyether Ether Ketone ◽

Flow Batteries ◽

Ether Ketone ◽

Vanadium Redox

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Interfacial Fracture Toughness Comparison of Three Indirect Resin Composites to Dentin and Polyether Ether Ketone Polymer

European Journal of Dentistry ◽

10.1055/s-0040-1713309 ◽

2020 ◽

Vol 14 (03) ◽

pp. 456-461

Author(s):

Rayhaneh Khalesi ◽

Mahdi Abbasi ◽

Zahra Shahidi ◽

Masoumeh Hasani Tabatabaei ◽

Zohreh Moradi

Keyword(s):

Fracture Toughness ◽

Bond Strength ◽

Testing Machine ◽

Composite Resins ◽

High Wear Resistance ◽

Luting Cements ◽

Anterior Teeth ◽

Polyether Ether Ketone ◽

Ether Ketone

Abstract Objectives Advances in laboratory composites and their high wear resistance and fracture toughness have resulted in their growing popularity and increasing use for dental restorations. This study sought to assess the fracture toughness of three indirect composites bonded to dental substrate and polyether ether ketone (PEEK) polymer. Materials and Methods This in vitro study was conducted on two groups of dental and polymer substrates. Each substrate was bonded to three indirect composite resins. Sixty blocks (3 × 3 × 12 mm) were made of sound bovine anterior teeth and PEEK polymer. Sixty blocks (3 × 3 × 12 mm) were fabricated of CRIOS (Coltene, Germany), high impact polymer composite (HIPC; Bredent, Germany), and GRADIA (Indirect; GC, Japan) composite resins. Composites were bonded to dentin using Panavia F 2.0 (Kuraray, Japan). For bonding to PEEK, Combo.lign (Bredent) and Visio.Link (Bredent) luting cements were used. In all samples, a single-edge notch was created by a no. 11 surgical blade at the interface. The samples were subjected to 3,500 thermal cycles, and their fracture toughness was measured in a universal testing machine (Zwick/Roell, Germany) by application of four-point flexural load. Statistical Analysis Data were analyzed using one-way analysis of variance, Kruskal–Wallis. Results The fracture toughness of CRIOS–PEEK interface was significantly higher than HIPC–PEEK. The fracture toughness of GRADIA–PEEK was not significantly different from that of HIPC and CRIOS. The fracture toughness of GRADIA–dentin was significantly higher than HIPC–dentin. Conclusion Considering the limitations of this study, GRADIA has the highest bond strength to dentin, while CRIOS shows the highest bond strength to PEEK.

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Adhesion Behaviour of Primary Human Osteoblasts and Fibroblasts on Polyether Ether Ketone Compared with Titanium under In Vitro Lipopolysaccharide Incubation

Materials ◽

10.3390/ma12172739 ◽

2019 ◽

Vol 12 (17) ◽

pp. 2739 ◽

Cited By ~ 1

Author(s):

Korbinian Benz ◽

Andreas Schöbel ◽

Marisa Dietz ◽

Peter Maurer ◽

Jochen Jackowski

Keyword(s):

Gene Expression ◽

Protein Level ◽

Binding Protein ◽

Sem Images ◽

Human Osteoblasts ◽

Polyether Ether Ketone ◽

Primary Human Osteoblasts ◽

Titanium Surfaces ◽

Ether Ketone

The aim of this in vitro pilot study was to analyse the adhesion behaviour of human osteoblasts and fibroblasts on polyether ether ketone (PEEK) when compared with titanium surfaces in an inflammatory environment under lipopolysaccharide (LPS) incubation. Scanning electron microscopy (SEM) images of primary human osteoblasts/fibroblasts on titanium/PEEK samples were created. The gene expression of the LPS-binding protein (LBP) and the LPS receptor (toll-like receptor 4; TLR4) was measured by real-time polymerase chain reaction (PCR). Immunocytochemistry was used to obtain evidence for the distribution of LBP/TLR4 at the protein level of the extra-cellular-matrix-binding protein vinculin and the actin cytoskeleton. SEM images revealed that the osteoblasts and fibroblasts on the PEEK surfaces had adhesion characteristics comparable to those of titanium. The osteoblasts contracted under LPS incubation and a significantly increased LBP gene expression were detected. This was discernible at the protein level on all the materials. Whereas no increase of TLR4 was detected with regard to mRNA concentrations, a considerable increase in the antibody reaction was detected on all the materials. As is the case with titanium, the colonisation of human osteoblasts and fibroblasts on PEEK samples is possible under pro-inflammatory environmental conditions and the cellular inflammation behaviour towards PEEK is lower than that of titanium.

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The effects of adding carbon nanotubes to the mechanical and tribological properties of a carbon fibre reinforced polyether ether ketone composite

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1243/09544062jmes1585 ◽

2009 ◽

Vol 223 (11) ◽

pp. 2501-2507 ◽

Cited By ~ 9

Author(s):

J Li ◽

L Q Zhang

Keyword(s):

Carbon Nanotubes ◽

Wear Resistance ◽

Carbon Fibre ◽

Vinyl Ester ◽

High Wear Resistance ◽

Compression Moulding ◽

Mechanical And Tribological Properties ◽

Polyether Ether Ketone ◽

Carbon Nano Tubes ◽

Ether Ketone

The main objective of this article is to develop a high wear resistance carbon fibre (CF)-reinforced polyether ether ketone composite with the addition of multi-wall carbon nano-tubes (MWCNT). These compounds were well mixed in a Haake batch mixer and compounded polymers were fabricated into sheets of known thickness by compression moulding. Samples were tested for wear resistance with respect to different concentrations of fillers. Wear resistance of a composite with 20 wt% of CF increases when MWCNT was introduced. The worn surface features have been examined using a scanning electron microscope (SEM). Photomicrographs of the worn surfaces revealed higher wear resistance with the addition of carbon nanotubes. Also better interfacial adhesion between carbon and vinyl ester in a carbon-reinforced vinyl ester composite was observed.

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