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8. Reversible, repeatable and low phase transition behaviour of spin coated nanostructured vanadium oxide thin films with superior mechanical properties

Author

Mukherjee, Dipta, primary, Dey, Arjun, additional, Esther, A. Carmel Mary, additional, Palai, Debajyoti, additional, Sridhara, N., additional, Bera, Parthasarathi, additional, Bhattacharya, Manjima, additional, Rajendra, A., additional, Sharma, Anand Kumar, additional, and Mukhopadhyay, Anoop Kumar, additional

Published
2018
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10. Study on the Bioactivity Response of the Newly Developed Zn–Cu–Mn/Mg Alloys for Biodegradable Implant Application

Author

Palai, Debajyoti, Roy, Trina, De, Amiyangshu, Mukherjee, Sayan, Bandyopadhyay, Sharba, Dhara, Santanu, Das, Siddhartha, and Das, Karabi

Abstract

Scaffolds play a crucial role in bone tissue engineering to support the defect area through bone regeneration and defect reconstruction. Promising tissue regeneration without negative repercussions and avoidance of the lifelong presence inside the body make bioresorbable metals prosper in the field of regenerative medicine. Recently, Zn and its alloys have emerged as promising biodegradable materials for their moderate degradation rate and satisfactory biocompatibility. Nevertheless, it is very challenging for cells to adhere and grow over the Zn surface alone, which influences the tissue-implant integration. In this study, an attempt has been made to systematically investigate the bioactivity responses in terms of in vitro hemocompatibility, cytotoxicity, antibacterial activity, and in vivo biocompatibility of newly developed Zn–2Cu–0.5Mn/Mg alloy scaffolds with different surface roughness. The rough surface of Zn–2Cu–0.5Mg shows the highest degradation rate of 0.16 mm/yr. The rough surface exhibits a prominent role in the adsorption of protein, further enhancing cell adhesion. Concentration-dependent alloy extract shows the highest cell proliferation for 12.5% of the extract with a maximum cell viability of 101% in Zn–2Cu–0.5Mn and 108% in Zn–2Cu–0.5Mg after 3 d. Acceptable hemolysis percentages (less than 5%) with promising anticoagulation properties are observed for all of the conditions. Enhanced antibacterial (Staphylococcus aureusand Escherichia coli) activity due to a significant effect of ions illustrates the maximum killing effect on the bacterial colony for the rough Zn–2Cu–0.5Mg alloy. In addition, it is observed that for rough Zn–2Cu–0.5Mn/Mg alloys, the inflammatory response is minimal after subcutaneous implantation, and neo-bone tissue forms in the defect areas of the rat femur with satisfactory biosafety response. The osseointegration property of the Zn–2Cu–0.5Mg alloy is comparable to that of the Zn–2Cu–0.5Mn alloy. Therefore, the rough surface of the Zn–2Cu–0.5Mg alloy has the potential to enhance biocompatibility and promote better osseointegration activity with host tissues for various biomedical applications.

Published
2024
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12. Development of Zn-2Cu- x Mn/Mg Alloys for Orthopedic Applications: Mechanical Performance to In Vitro Degradation under Different Physiological Environments.

Author

Palai D, Siva Prasad P, Satpathy B, Das S, and Das K

Subjects
Materials Testing, Zinc, X-Ray Diffraction, Biocompatible Materials, Alloys chemistry
Abstract

Zinc (Zn) and its alloys are considered futuristic biodegradable materials for their acceptable mechanical properties, suitable corrosion rate, and good biocompatibility. In this study, we report newly developed biodegradable Zn-2Cu -x Mn/Mg ( x = 0, 0.1, and 0.5) alloys, aiming to achieve good mechanical strength with excellent elongation, desirable wear resistance, and suitable corrosion rate. The effect of Mn/Mg addition on the structural, mechanical, wear, and degradation behaviors of the Zn-2Cu- x Mn/Mg alloys was thoroughly investigated. Degradation and tribological behaviors of the alloys were explored in the presence of simulated body fluid (SBF), Dulbecco's modified Eagle medium (DMEM), and DMEM with a 10% fetal bovine serum (FBS) solution. Alloy elements and hot rolling improve their mechanical properties significantly due to precipitation hardening, grain refinement, and solid solution strengthening owing to the formation of MnZn 13 and Mg 2 Zn 11 phases. Among all the alloys, the Zn-2Cu-0.5Mn alloy achieved the highest ultimate tensile strength (UTS) of ∼405 MPa and yield strength (YS) of ∼293 MPa with an excellent elongation of ∼51%. The corrosion behavior of the alloys as determined by a potentiodynamic polarization study under different solutions follows the sequence Zn-2Cu < Zn-2Cu-0.5Mn < Zn-2Cu-0.1Mn < Zn-2Cu-0.1Mg < Zn-2Cu-0.5Mg. The corrosion rate by immersion testing for 30 and 90 days also follows the same sequence. The corrosion rate in different solutions follows the order SBF > DMEM + 10%FBS > DMEM. The addition of Mn/Mg also improves the wear resistance and slows the wear rate under wet conditions. The bending test results also indicate the highest bending strength of ∼375 MPa for the Zn-2Cu-0.5Mn alloy, among all the alloys. The bending and tensile strengths deteriorate continuously after the immersion for 30 and 90 days in the solution of SBF, DMEM, and DMEM + 10%FBS. Therefore, the Zn-2Cu- x Mn/Mg ( x = 0.1 and 0.5) alloys can be considered potential biodegradable implant materials.

Published
2023
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