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Li Y, Yin Y, Li L. Conferring NiTi alloy with controllable antibacterial activity and enhanced corrosion resistance by exploiting Ag@PDA films as a platform through a one-pot construction route. Heliyon 2024; 10:e34154. [PMID: 39113964 PMCID: PMC11304019 DOI: 10.1016/j.heliyon.2024.e34154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2024] [Revised: 07/03/2024] [Accepted: 07/04/2024] [Indexed: 08/10/2024] Open
Abstract
The lack of antibacterial activity and the leaching of Ni ions seriously limit the potential applications of the near equiatomic nickel-titanium (NiTi) alloy in the biomedical field. In this study, a silver nanoparticles (Ag NPs) wrapped in a polydopamine (Ag@PDA) film modified NiTi alloy with controllable antibacterial activity and enhanced corrosion resistance was achieved using a one-pot approach in a mixed solution of AgNO3 and dopamine. The controllable antibacterial activity could be achieved by adjusting the initial concentration of dopamine (Cdop), which obtained Ag@PDA films with varying thickness of polydopamine layers coated on Ag NPs, thereby conferring different levels of antibacterial activity to the modified NiTi alloy. In vitro antibacterial ratios (24 h) of Ag@PDA film-modified NiTi alloy against E.coli and S.aureus ranged from 46 % to 100 % and from 42 % to 100 %, respectively. The release curves of Ag ions indicated the persistent antibacterial effect of Ag@PDA film-modified NiTi alloy for at least 21 days. Moreover, in vitro cytotoxicity and in vivo implantation tests demonstrated the satisfactory biosafety of the Ag@PDA film-modified NiTi alloy when used as bioimplants. This research offers valuable insight into meeting various antibacterial demands for NiTi alloy implantations and highlights the potential of Ag-containing film-modified biomaterials in addressing different types of infections induced by implantations.
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Affiliation(s)
- Ying Li
- College of Life Science, Mudanjiang Medical University, Mudanjiang, 157011, Heilongjiang Province, PR China
- School of Health Management, Mudanjiang Medical University, Mudanjiang, 157011, Heilongjiang Province, PR China
| | - Yongkui Yin
- College of Life Science, Mudanjiang Medical University, Mudanjiang, 157011, Heilongjiang Province, PR China
| | - Luxin Li
- College of Life Science, Mudanjiang Medical University, Mudanjiang, 157011, Heilongjiang Province, PR China
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Guo M, Qi B, Li J, Shi X, Ni H, Shi H, Ren J, Zhou X, Ye T, Yao L, Xu Y, Zhang M, Li C. Mechanical properties evaluation of metacarpophalangeal joint prosthesis with new titanium-nickel memory alloy: a cadaver study. BMC Musculoskelet Disord 2023; 24:738. [PMID: 37715199 PMCID: PMC10504783 DOI: 10.1186/s12891-023-06859-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Accepted: 09/06/2023] [Indexed: 09/17/2023] Open
Abstract
OBJECTIVE Ni-Ti memory alloys are unusual materials for hard-tissue replacement because of their unique superelasticity, good biocompatibility, high strength, low specific gravity, low magnetism, wear resistance, corrosion resistance and fatigue resistance. The current study aims to evaluate its mechanical properties and provide biomechanical basis for the clinical application of the prosthesis. METHODS Ten adult metacarpophalangeal joint specimens were randomly divided into a prosthesis group (n = 5, underwent metacarpophalangeal joint prosthesis) and a control group (n = 5, underwent sham operation). Firstly, the axial compression strength was tested with BOSE material testing machine to evaluate its biomechanical strength. Secondly, these specimens were tested for strain changes using BOSE material testing machine and GOM non-contact optical strain measurement system to evaluate the stress changes. Thirdly, fatigue test was performed between groups. Lastly, the mechanical wear of the metacarpophalangeal joint prosthesis was tested with ETK5510 material testing machine to study its mechanical properties. RESULTS Axial compression stiffness in the prosthesis group was greater than that in the control group in terms of 30 ° and 60 ° flexion positions (P < 0.05). There was no statistically significant difference between two groups with regards to axial compression stiffness and stress change test (P > 0.05). In the fatigue wear test, the mean mass loss in the prosthesis group's prosthesis was 17.2 mg and 17.619 mm3, respectively. The mean volume wear rate was 0.12%. There was no statistically significant difference in the maximum pull-out force of the metacarpal, phalangeal, and polymer polyethylene pads between the prosthesis group and the control group specimens. CONCLUSIONS Ni-Ti memory alloy metacarpophalangeal joint prosthesis conforms to the biomechanical characteristics of metacarpophalangeal joints without implants, and the fatigue strength can fully meet the needs of metacarpophalangeal joint activities after joint replacement.
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Affiliation(s)
- Minzheng Guo
- Kunming Medical University, 650500, Kunming, China
- Department of Orthopaedic, 920th Hospital of Joint Logistics Support Force, No. 212 Daguan Road, Xishan District, 650118, Kunming, China
| | - Baochuang Qi
- Kunming Medical University, 650500, Kunming, China
- Department of Orthopaedic, 920th Hospital of Joint Logistics Support Force, No. 212 Daguan Road, Xishan District, 650118, Kunming, China
| | - Jun Li
- Department of Orthopaedic, 920th Hospital of Joint Logistics Support Force, No. 212 Daguan Road, Xishan District, 650118, Kunming, China
| | - Xiangwen Shi
- Kunming Medical University, 650500, Kunming, China
- Department of Orthopaedic, 920th Hospital of Joint Logistics Support Force, No. 212 Daguan Road, Xishan District, 650118, Kunming, China
| | - Haonan Ni
- Kunming Medical University, 650500, Kunming, China
- Department of Orthopaedic, 920th Hospital of Joint Logistics Support Force, No. 212 Daguan Road, Xishan District, 650118, Kunming, China
| | | | - Junxiao Ren
- Yunnan University of Chinese Medicine, 650500, Kunming, China
| | - Xizong Zhou
- Department of Orthopedics, Yanjin County Hospital, 657500, Zhaotong, China
| | - Tao Ye
- Department of Orthopaedic, 920th Hospital of Joint Logistics Support Force, No. 212 Daguan Road, Xishan District, 650118, Kunming, China
| | - Ling Yao
- Department of Orthopaedic, 920th Hospital of Joint Logistics Support Force, No. 212 Daguan Road, Xishan District, 650118, Kunming, China
| | - Yongqing Xu
- Department of Orthopaedic, 920th Hospital of Joint Logistics Support Force, No. 212 Daguan Road, Xishan District, 650118, Kunming, China
| | - Meichao Zhang
- Anatomy department, School of Basic Medical Science, Southern Medical University, No. 1023-1063 Shatai South Road, Baiyun District, 510515, Guangzhou, China.
| | - Chuan Li
- Department of Orthopaedic, 920th Hospital of Joint Logistics Support Force, No. 212 Daguan Road, Xishan District, 650118, Kunming, China.
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Maddu J, Karrolla B, Shaik RU, Elahi H, Arkanti K. Evaluation of Bronze Electrode in Electrical Discharge Coating Process for Copper Coating. MICROMACHINES 2023; 14:136. [PMID: 36677197 PMCID: PMC9865959 DOI: 10.3390/mi14010136] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/26/2022] [Revised: 12/29/2022] [Accepted: 12/30/2022] [Indexed: 06/17/2023]
Abstract
One of the widely used non-traditional machines for machining of hard materials into complex shapes and different sizes is the electrical discharge machine (EDM). Recently, the EDM has been used for deposition by controlling the input parameters (current and duty cycle). This work was carried out to evaluate the readily available bronze (88% Cu + 12% Sn) electrode for deposition of copper material on titanium alloy. Experiments were conducted according to Taguchi experimental design considering the input parameters of current, Ton, Toff and preheating temperature of substrates. Titanium alloy was further hardened by preheating at temperatures of 100 °C, 300 °C and 500 °C and quenching in brine, castor oil and vegetable oil in order to avoid workpiece erosion. After this treatment, hardness, grain area, grain diameter and number of grains were characterized to compare with pretreated substrates. Then, the treated substrates were taken for copper deposition with the EDM. Output parameters such as material deposition rate (MDR), electrode wear rate (EWR), coating thickness (CT), elemental composition and surface crack density (SCD) were found. Material characterization was carried out using a scanning electron microscope (SEM) with energy dispersive X-ray spectroscopy (EDX) and optical microscopy. Output parameters were optimized with technique for order of preference by similarity to ideal solution (TOPSIS) to find optimum parameters. A sixth experiment with parameter values of Ton of 440 µs, Toff of 200 µs, preheating temperature of 300 °C and quenching medium of castor oil was optimum with MDR of 0.00506 g/m, EWR of 0.00462 g/m, CT of 40.2 µm and SCD 19.4 × 107 µm2.
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Affiliation(s)
- JagadeeswaraRao Maddu
- Department of Mechanical Engineering, University College of Engineering, Osmania University, Hyderabad 500007, India
| | - Buschaiah Karrolla
- Department of Mechanical Engineering, University College of Engineering, Osmania University, Hyderabad 500007, India
| | - Riyaaz Uddien Shaik
- Department of Astronautics Electrical and Energy Engineering, University of Rome “La Sapienza”, Via Eudossiana 18, 00184 Rome, Italy
- Department of Civil and Environmental Engineering, University of California, Los Angeles, CA 90095, USA
| | - Hassan Elahi
- Department of Mechanical and Aerospace Engineering, University of Rome “La Sapienza”, Via Eudossiana 18, 00184 Rome, Italy
| | - Krishnaiah Arkanti
- Department of Mechanical Engineering, University College of Engineering, Osmania University, Hyderabad 500007, India
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SWOT Analysis of Electrical Discharge Coatings: A Case Study of Copper Coating on Titanium Alloy. SURFACES 2022. [DOI: 10.3390/surfaces5020021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The electrical discharge machine (EDM) has been one of the most widely used non-traditional machines in recent decades, primarily used for machining hard materials into various complex shapes and different sizes and, nowadays, used for surface modifications/hard coatings. In this study, the SWOT (strengths, weaknesses, opportunities and threats) of electrical discharge coating was analyzed by conducting a case study. For the purpose of the case study, copper was deposited on the titanium alloy surface (Ti6Al4V). Three electrodes of different copper alloy materials, viz., brass, bronze and copper, were selected for coating the Ti6Al4V surface. Input parameters such as current, pulse-on, pulse-off, flushing pressure and the electrode material were optimized to develop a uniform coating. Experiments were designed according to the L18 orthogonal array, and among them, the samples that showed proper coating, as seen with the naked eye, were selected for morphological and elemental analyses by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX. Further, the output responses, viz., the material deposition rate (MDR), electrode wear rate (EWR), surface roughness (SR), elemental data (copper (Cu) and zinc (Zn)) and coating thickness (CT), were considered for the optimization of coatings. Implementing the Technique for Order Performance by Similarity to Ideal Solution, copper coating with a thickness of 20.43 µm, developed with an MDR with input parameters of 20 A current, 600 µs pulse-on, 120 µs pulse-off, 0.5 bar flushing pressure and the brass electrode, was selected as the optimum coating. The most influential parameters in this coating process were the current and pulse-on time. In this study, a SWOT table was developed to depict the strengths, weaknesses, opportunities and threats of electrical discharge coating.
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