Thermo-physical modeling and experimental validation of core-shell nanoparticle fabrication of nickel-titanium (nitinol) alloy

Parmar, Vinod; Singh, Sonu; Kumar, Sunil; Prakash, G. Vijaya; Kalyanasundaram, Dinesh

doi:10.1016/j.optlastec.2020.106880

Cited by 6 publications

(3 citation statements)

References 44 publications

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“…With femtosecond laser cutting, microstructural grain recrystallization is avoided, hence mitigating potential adverse effects to the phase transformation temperatures. [134][135][136] Figure 29 shows an example of how ultrafast laser cutting has a negligible effect on the phase transformation temperatures. With a CW laser cut, there is a significant shift in the DSC results.…”

Section: Ultrashort Pulse Widthmentioning

confidence: 99%

Nickel–Titanium Alloy Laser Micromachining: A Review of Nitinol Laser Processes and Optimization for High‐Speed Laser Cutting

Otto,

Vaseghi,

Davami

2024

Adv Eng Mater

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The nickel‐titanium (NiTi) alloy, “Nitinol”, has become a prominent name in the medical device industry amongst medical device manufacturers. The unique properties of the material, such as the shape memory effect and pseudoelasticity, have earned the material increasing popularity for new product innovations. Amongst the various manufacturing processes for metal alloys, laser micromachining has taken the lead for processing Nitinol‐based products. This literature review provides an analysis of the history and applications of Nitinol, an overview of the microstructure of the material, and a review of the current manufacturing methods for laser cutting medical‐grade Nitinol. A more in‐depth focus is placed on the realm of laser processing and the challenges associated with the manufacturing process. Ultrafast femtosecond pulse processing delivers promising results and quality for manufacturing Nitinol medical devices. However, there exists a need to investigate potential approaches to increase the cutting speed of the process to enhance throughput and stay competitive in a growing market due to the cutting speed being over 4‐times slower than long pulse cutting. Many tactics to address the problem are discussed, ranging from laser selection, processing parameters, and non‐traditional laser processing approaches.This article is protected by copyright. All rights reserved.

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Section: Ultrashort Pulse Widthmentioning

confidence: 99%

Nickel–Titanium Alloy Laser Micromachining: A Review of Nitinol Laser Processes and Optimization for High‐Speed Laser Cutting

Otto,

Vaseghi,

Davami

2024

Adv Eng Mater

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“…Values of each material are given in Table 3. [66][67][68][69][70][71][72] For both anodic and cathodic behavior of a corroding material, electron transfer which is leading to electric current is directly associated in a corrosion process. Therefore, corrosion speed and rate depend on the releasing electron number and current flow between anodic and cathodic regions in a structure.…”

Section: Electrochemical Parameter Modeling For the Corrosion And Isr...mentioning

confidence: 99%

Computer‐Aided Analysis of the Corrosion Inhibition by Carbon‐Based Thin‐Film Coating on Vascular Bare Metal Stent Models

Akdoğan

Istanbullu

2022

Advcd Theory and Sims

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A simulation study of inhibiting the corrosion and corrosion-based restenosis is presented by diamond-like carbon (DLC) thin-film coating on bare-metallic intravascular stent models. The stents are designed and placed in a blood vessel model including a fatty-plaque layer in the study. 316L-stainless steel, CoCr-alloy, and nitinol are assigned to the stent models considering stent manufacturing. Modeled stents are coated with a carbon-based structure that mimics the DLC thin film. The electrochemical simulations are performed under the dynamic non-Newtonian blood flow condition for a 1 year period. Electrolytic current densities, corrosion, and restenosis rates of the bare and coated stents are simulated using time-dependent laminar flow and corrosion modules in multiphysics analysis software. Among the bare-stent models, the highest corrosion rate is observed for 316L with 79 µm year −1 and the minimum corrosion rate is observed for nitinol with 9 µm year −1 . Restenosis rates increase up to 36 µm year −1 due to the charged-particle adhesion on the bare stent surfaces. However, DLC-thin-film coating reduces corrosion and in-stent restenosis (ISR) rates down to 0.94 and 0.2 µm year −1 respectively. It can be concluded that surface passivation by thin-film DLC coating may be considered a promising candidate for novel stent designs having lower corrosion-based issues and ISR risks.

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“…Nitinol is a shape memory alloy made from nickel and titanium and has the ability to restore its original shape after deformation (Bhardwaj et al, 2019). Shape memory effects have been observed during austenite to martensite transformation, i.e., transformation from the face-centered cubic (FCC) structure to a body-centered tetragonal (BCT) structure (Parmar et al, 2021). Nitinol has gained popularity in the biomedical field, given its corrosion resistance, acceptable biocompatibility, super-elasticity, osseointegration, and fatigue and kink resistance properties (Hamann et al, 2020;Ulacia et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Modified Surface Composition and Biocompatibility of Core-Shell Nitinol Nanoparticles Fabricated via Laser Ablation of Differently Passivized Targets

et al. 2022

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Nitinol is a versatile alloy known for its shape memory effect and thus finds multiple applications in biomedical devices and implants. The biomedical applications of nitinol-based devices are, however, limited because of concerns related to leaching and its associated cytotoxicity. In particular, nitinol nanoparticles (NPs), despite being highly promising for biomedical applications such as nano-actuators and biomolecular delivery agents are not explored, owing to the same concerns. Moreover, nitinol nanoparticles and their biological interactions are not fully characterized, and the available literature on their toxicity portrays a divided picture. Surface passivation of nitinol using multiple methods has been explored in the past to reduce the leaching of nickel in implants while also improving the thrombogenic properties. In this work, we reported the preparation of passivized nitinol NPs by laser ablation of nitinol targets, followed by different surface treatments. The effect of different treatments in reducing nickel leaching and its influence on biocompatibility were studied. The biocompatibility and multi-faceted interaction of nitinol NPs with osteoblast cells and associated toxicity were explored. Homogenous nitinol NPs were found to be generated at 25 W of laser power. Also, surface modification using hydrogen peroxide, anodization, and acid etching was found to be effective in waning the nickel leaching and improving biocompatibility. In view of the observed results of cellular interactions, we discussed the possible routes of cellular toxicity of these NPs. The prospective applications of such passivized NPs in the biomedical field are also discussed in this work.

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Thermo-physical modeling and experimental validation of core-shell nanoparticle fabrication of nickel-titanium (nitinol) alloy

Cited by 6 publications

References 44 publications

Nickel–Titanium Alloy Laser Micromachining: A Review of Nitinol Laser Processes and Optimization for High‐Speed Laser Cutting

Nickel–Titanium Alloy Laser Micromachining: A Review of Nitinol Laser Processes and Optimization for High‐Speed Laser Cutting

Computer‐Aided Analysis of the Corrosion Inhibition by Carbon‐Based Thin‐Film Coating on Vascular Bare Metal Stent Models

Modified Surface Composition and Biocompatibility of Core-Shell Nitinol Nanoparticles Fabricated via Laser Ablation of Differently Passivized Targets

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