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• W1974574783 abstract ". ► Ultra High Molecular Weight Polyethylene surface was modified with femtosecond laser pulses at 1027 nm wavelength. ► Surface roughness is increased. ► Ablation efficiency is maximum for 6 μJ pulses. ► Irradiated surfaces remain almost chemically unaltered. Ultra-high-molecular-weight polyethylene (UHMWPE) is a polymer with mechanical and corrosion properties, which make it appropriate for using in biomedical devices such as hip and knee prostheses. The surface morphology and chemistry of UHMWPE influence its biocompatibility. A laser with wavelength at 1027 nm delivering 450 fs pulses at a repetition rate of 1 kHz is used to modify the surface of UHMWPE samples with 0.45 μm root mean square surface roughness. Micrometric resolution is achieved with the use of a focusing lens of 0.25 NA and pulse energies of few microjoules. The study focuses in the influence of different pulse energies and pulse overlaps on the laser-induced surface roughness and ablation yield. Confocal microscopy is used to characterize changes in the morphology of the irradiated surfaces, and their chemical structure is analyzed by attenuated total reflectance infrared and Raman spectroscopies. The roughness increases as the pulse energy increases until it reaches a maximum. The ablation yield increases with the pulse energy and pulse overlap. However, the ablation yield per pulse is lower for higher pulse overlap. Pulses of 6 μJ have the highest ablation efficiency. Infrared and Raman spectra of samples irradiated with low energy pulses are similar to those of the pristine sample. However, some C C and C O bonds can be detected after irradiation with the highest pulse energies." @default.
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• W1974574783 date "2012-09-01" @default.
• W1974574783 modified "2023-10-17" @default.
• W1974574783 title "Surface modification of UHMWPE with infrared femtosecond laser" @default.
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• W1974574783 doi "https://doi.org/10.1016/j.apsusc.2011.09.106" @default.
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