Preparation of porous microstructures on NiTi alloy surface with femtosecond laser pulses

Abstract

Porous microstructures on Nickel-Titanium (NiTi) alloy surfaces were prepared by linearly polarized femtosecond lasers with moving focal point at a certain speed. It was found that various novel microstructures from feather-like ripples to cluster-like porous textures could be formed with increasing laser energy. Particularly, when the laser energy was 400 μJ, a periodic porous metal surface was generated. Measurement of X-ray diffraction showed that the grains on the sample surface were refined through femtosecond laser ablation processes, but the crystal structures still kept their original states. Analysis by X-ray photoelectron spectroscopy revealed that Ni/Ti on the sample surface was changed with an evident oxidization of titanium element under different laser energies. This investigation provides a new approach to improve the biocompatibility of NiTi-based implant devices.femtosecond laser, NiTi alloy, porous microstructures, grain refinement

Surface Engineering of Cardiovascular Devices for Improved Hemocompatibility and Rapid Endothelialization

“…By using a femtosecond laser, the well-ordered porous microstructures from featherlike ripples to cluster-like porous textures can be formed on metal stent surface. [156] Accordingly, SMCs-biomimetic microstructure in the nano-micro range can be produced on implant surfaces to promote the SMCs adhesion. 316L SS stents with SMCs-biomimetic micro-nanopatterns were obtained according to the morphology of SMCs recorded by atomic force microscopy (Figure 2F).…”

Laser-induced structured biomimetic surface

“…就显色机理而言生物体表面呈 现的五颜六彩的颜色分为化学色以及物理色 [80] , 化学 色是指生物体内的色素对光进行吸收致使表面呈现不 同的色彩, 而物理色则是来源于表面的微结构产生的 薄膜干涉、光子晶体、光栅衍射以及散射产生的效果, 即为结构色 [81] . Vorobyev [79,82~85] 优势 [94] , 可以在多种表面上制造有序的周期性微纳 米结构 [95,96] . ; the enlarged region between endothelium and vascular smooth muscle in circumstance of (e) primitive blood vessels, (f) NTS-implanted blood vessels and (g) LTS-implanted blood vessels; tissue adhesion to the (h) normal electrode substrate (i) biomimetic electrode and (j) coupled biomimetic electrode; the SEM images of the surface of (k) normal electrode substrate and (l) coupled biomimetic electrode substrate [92,93] 评 述 Han等人 [93] In natural selection, "survival of the fittest" is the prevailing mechanism where organisms have constantly been evolving to adapt themselves to their surroundings.…”

The applications and research progresses of nickel–titanium shape memory alloy in reconstructive surgery

“…A research [53] on porous nitinol interbody fusion device revealed that nitinol has perfect biocompatibility on the dura mater, spinal cord and nerve roots, lymph nodes (abdominal para-aortic), and organs (kidneys, spleen, pancreas, liver, and lungs). Liang et al [54] prepared porous microstructures on Nickel-Titanium (NiTi) alloy surfaces by linearly polarized femtosecond lasers with moving focal point at a certain speed. This investigation provides a new approach to improve the biocompatibility of NiTi-based implant devices.…”