Biocompatibility of nanoactuators: stem cell growth on laser-generated nickel–titanium shape memory alloy nanoparticles
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Nanoactuators made from nanoparticulate NiTi shape memory alloy show potential in the mechanical stimulation of bone tissue formation from stem cells. We demonstrate the fabrication of Ni, Ti, and NiTi shape memory alloy nanoparticles and their biocompatibility to human adipose-derived stem cells. The stoichiometry and phase transformation property of the bulk alloy is preserved during attrition by femtosecond laser ablation in liquid, giving access to colloidal nanoactuators. No adverse effect on cell growth and attachment is observed in proliferation assay and environmental electron scanning microscopy, making this material attractive for mechanical stimulation of stem cells.
KeywordsNanoparticles Nanoactuators Nickel Titanium Nitinol Biocompatibility Stem cell Laser ablation Bone tissue formation Nanomedicine
This work was supported by the German Research Foundation within the TransRegio 37 “Micro- and Nanosystems in Medicine—Reconstruction of biologic Functions” and within the projects BA 3580/2-1 and CH-179/9-1. The authors thank Juan Manuel Bellver for carrying out part of the investigation on femtosecond laser ablation at the LZH.
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