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Inicio  /  Applied Sciences  /  Vol: 10 Par: 7 (2020)  /  Artículo
ARTÍCULO
TITULO

Surface Functionalization of Polyethylene by Silicon Nitride Laser Cladding

Matteo Zanocco    
Elia Marin    
Francesco Boschetto    
Tetsuya Adachi    
Toshiro Yamamoto    
Narisato Kanamura    
Wenliang Zhu    
Bryan J. McEntire    
B. Sonny Bal    
Ryutaro Ashida    
Osam Mazda and Giuseppe Pezzotti    

Resumen

Functional coatings are commonly applied to biomaterials in order to improve their properties. In this work, polyethylene was coated with a silicon nitride (Si3N4) powder using a pulsed laser source in a nitrogen gas atmosphere. Several analytical techniques were used to characterize the functionalized surface of the polymer, including Raman spectroscopy, laser microscopy, scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDS). Antibacterial properties were tested in vitro against Staphylococcus epidermidis. The Si3N4 coating sensibly reduced the amount of living bacteria when compared to the uncoated polymer. Osteoconductivity was also tested in vitro using SaOS-2 osteosarcoma cells. The presence of Si3N4 coating resulted in an increased amount of hydroxyapatite. Coating of polyethylene with silicon nitride may lead to improved performance of indwelling orthopaedic or less invasive medical devices.

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