Low-energy He-ion beam modifications the surface properties of biomaterial

Abstract

In the present work, ultra-high-molecular-weight polyethylene (UHMWPE) films were irradiated with 130 keV He ions. The fluence of the ion beam was ranged from 1 × 10¹² to 1 × 10¹⁶ cm⁻². The chemical, morphological, and crystallite structure changes resulted from the ion bombardment were obtained using different spectroscopic techniques. These techniques were Fourier transform infrared spectrometer, scanning electron microscope, X-ray diffraction, and UV–vis spectrophotometry. The surface free energy for untreated and ion-beam-treated samples was determined by means of contact angle measurements of three different liquids. Our results showed a decrease in the crystallinity of UHMWPE and formation of C=O groups on the polymer surface for modified samples as well. A remarkable shifting in the UV–vis spectra toward lower energy and increase in the optical absorption were observed as the ion fluence increases. Measurements of the contact angle indicate remarkable increase in the surface free energy as a function of ion fluence.

Keywords:

• ultra-high-molecular-weight polyethylene
• ion bombardment
• surface properties
• biocompatibility

Acknowledgment

The authors would like to thank Prof. Dr A. Turos and the staff of the Institute of Electronic Material Technology (IEMT) Warsaw, Poland, for providing the facilities of the ion implantation.

Disclosure statement

No potential conflict of interest was reported by the authors.