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Technical Brief

Laser surface modification of rare earth containing magnesium alloy through simulated body fluid and its impact on cells viability

[+] Author and Article Information
Khadka Indira

School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798; SIMTech-NTU Joint Laboratory (Precision Machining), Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798
INDIRA002@e.ntu.edu.sg

Wang Zhongke

SIMTech-NTU Joint Laboratory (Precision Machining), Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798; Machining Technology Group, Singapore Institute of Manufacturing Technology, 2 Fusionopolis Way, Singapore 138634
zkwang@simtech.a-star.edu.sg

Zheng Hongyu

SIMTech-NTU Joint Laboratory (Precision Machining), Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798; Machining Technology Group, Singapore Institute of Manufacturing Technology, 2 Fusionopolis Way, Singapore 138634; School of Mechanical Engineering, Shandong University of Technology, Zibo, China
zhenghongyu@sdut.edu.cn

Castagne Sylvie

Department of Mechanical Engineering, KU Leuven, Celestijnenlaan 300 - box 2420, 3001 Leuven, Belgium; Member Flanders Make, 3001 Leuven, Belgium
sylvie.castagne@kuleuven.be

1Corresponding author.

ASME doi:10.1115/1.4043941 History: Received November 11, 2018; Revised May 27, 2019

Abstract

Magnesium alloys have a good potential as structural biomaterials for temporary implant applications because of their self-degradation properties and biocompatibility. The surface condition is important for such applications and lasers are often used to modify the surface characteristics of such components. In this context, the media through which the laser beam passes before reaching the surface to be irradiated is also of interest. In particular, laser irradiation in liquids affects the thermal energy delivery to the surface of the material, which in turns influences the formation of surface structures. In this work, rare earth containing WE54 Mg alloy has been irradiated under air and through a simulated body fluid (SBF) layer using a 500 watt pulsed Nd: YAG laser. As compared to direct laser surface treatment through air, laser irradiation through SBF generates new surface structures and deposition of ions issued from the SBF solution. Scanning electron microscope (SEM) combined with energy dispersive spectroscopy (EDS) was used for the examination of surface structures formation and determination of elemental composition. Mesenchymal stem cells (MSC) culture was performed on laser modified WE54 alloy surface and the MSC cytocompatibility on SBF treated substrates was evaluated by the PrestoBlue™ assay test method. Cell reproducibility was observed on the SBF laser treated surface which indicated that cell viability was improved by the surface treatment. The deposition of calcium and phosphorus ions on the WE54 surface was beneficial for cell viability. These results motivate the potential use of SBF based films for biomedical purposes.

Copyright (c) 2019 by ASME
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