The influence of chemical etching on porous structure and mechanical properties of the Ti6AL4V Functionally Graded Porous Scaffolds fabricated by EBM

2022 ◽  
Vol 275 ◽  
pp. 125217
Author(s):  
Maria A. Surmeneva ◽  
Dmitriy Khrapov ◽  
Konstantin Prosolov ◽  
Maria Kozadayeva ◽  
Andrey Koptyug ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Porous Structure ◽  
Chemical Etching ◽  
Functionally Graded ◽  
Porous Scaffolds

Effect of Dynamic Chemical Etching on the Pore Structure, Permeability, and Mechanical Properties of Ti-Nb-Zr Scaffolds for Medical Applications

2020 ◽  
Vol 143 (5) ◽  
Author(s):  
V. Sheremetyev ◽  
S. Dubinskiy ◽  
M. A. Iqbal ◽  
K. Lukashevich ◽  
S. Prokoshkin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Porous Structure ◽  
Chemical Etching ◽  
Etching Technique ◽  
Essential Step ◽  
Compressive Stresses ◽  
Structure Geometry ◽  
Structure Lead ◽  
New Generation ◽  
Potential Use

Abstract Improving the post-processing of metallic porous tissue scaffolds is an essential step to create a new generation of superelastic implants for the replacement of damaged bone tissue. In this study, the dynamic chemical etching technique is applied to improve the permeability and to optimize the porous structure of Ti-Nb-Zr scaffolds fabricated by the powder metallurgy-based space holder technique. The etched scaffolds are characterized in terms of their porous structure geometry, permeability, and mechanical properties. It is shown that an increase in porosity from 49% to 54% during the etching is mainly due to an increase in the number of 100 to 800 μm-diameter pores, from 30% to 50% of them measuring from 100 to 300 μm in size. These changes in the porous structure lead to a significant increase of its permeability, i.e., from (0.1–15) × 10−11 m2 before etching to (44–91) × 10−11 m2, after etching; these permeability ranges corresponding to those of bone tissues. Furthermore, the etched scaffolds show systematically higher yield compressive stresses as compared to the as-sintered scaffolds of equivalent porosities. Finally, the highly permeable etched Ti-Nb-Zr scaffolds with a porosity varying from 40% to 60% exhibit an apparent Young’s modulus ranging from 8.6 to 1.9 GPa and an ultimate compressive strength from 650 to 190 MPa, which can be considered as a promising balance of properties for the potential use of these scaffolds as bone implants.

scholarly journals Functionally graded porous scaffolds in multiple patterns: New design method, physical and mechanical properties

2018 ◽  
Vol 160 ◽  
pp. 849-860 ◽  
Author(s):  
Fei Liu ◽  
Zhongfa Mao ◽  
Peng Zhang ◽  
David Z. Zhang ◽  
Junjie Jiang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Design Method ◽  
Physical And Mechanical Properties ◽  
Functionally Graded ◽  
Porous Scaffolds

scholarly journals Mechanical Properties and In Vitro Behavior of Additively Manufactured and Functionally Graded Ti6Al4V Porous Scaffolds

Metals ◽  
2018 ◽  
Vol 8 (4) ◽  
pp. 200 ◽  
Author(s):  
Ezgi Onal ◽  
Jessica Frith ◽  
Marten Jurg ◽  
Xinhua Wu ◽  
Andrey Molotnikov
Keyword(s):  
Mechanical Properties ◽  
Functionally Graded ◽  
Porous Scaffolds

scholarly journals Development of Biopolymeric Hybrid Scaffold-Based on AAc/GO/nHAp/TiO2 Nanocomposite for Bone Tissue Engineering: In-Vitro Analysis

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1319
Author(s):  
Muhammad Umar Aslam Khan ◽  
Wafa Shamsan Al-Arjan ◽  
Mona Saad Binkadem ◽  
Hassan Mehboob ◽  
Adnan Haider ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tissue Engineering ◽  
Bone Tissue Engineering ◽  
Bone Tissue ◽  
Guar Gum ◽  
Porous Scaffolds ◽  
Vitro Assay ◽  
Vitro Analysis ◽  
Nanocomposite Scaffolds

Bone tissue engineering is an advanced field for treatment of fractured bones to restore/regulate biological functions. Biopolymeric/bioceramic-based hybrid nanocomposite scaffolds are potential biomaterials for bone tissue because of biodegradable and biocompatible characteristics. We report synthesis of nanocomposite based on acrylic acid (AAc)/guar gum (GG), nano-hydroxyapatite (HAp NPs), titanium nanoparticles (TiO2 NPs), and optimum graphene oxide (GO) amount via free radical polymerization method. Porous scaffolds were fabricated through freeze-drying technique and coated with silver sulphadiazine. Different techniques were used to investigate functional group, crystal structural properties, morphology/elemental properties, porosity, and mechanical properties of fabricated scaffolds. Results show that increasing amount of TiO2 in combination with optimized GO has improved physicochemical and microstructural properties, mechanical properties (compressive strength (2.96 to 13.31 MPa) and Young’s modulus (39.56 to 300.81 MPa)), and porous properties (pore size (256.11 to 107.42 μm) and porosity (79.97 to 44.32%)). After 150 min, silver sulfadiazine release was found to be ~94.1%. In vitro assay of scaffolds also exhibited promising results against mouse pre-osteoblast (MC3T3-E1) cell lines. Hence, these fabricated scaffolds would be potential biomaterials for bone tissue engineering in biomedical engineering.

scholarly journals Atomistic modelling of functionally graded Cu-Ni alloy and its implication on the mechanical properties of nanowires

2021 ◽  
Author(s):  
Md Shajedul Hoque Thakur ◽  
Mahmudul Islam ◽  
Nur Jahan Monisha ◽  
Pritom Bose ◽  
Md. Adnan Mahathir Munshi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Functionally Graded ◽  
Atomistic Modelling ◽  
Ni Alloy

Fabrication of poly (1, 8-octanediol-co-Pluronic F127 citrate)/chitin nanofibril/bioactive glass (POFC/ChiNF/BG) porous scaffold via directional-freeze-casting

2020 ◽  
Vol 40 (7) ◽  
pp. 591-599
Author(s):  
Yaling Tian ◽  
Kai Liang ◽  
Yali Ji
Keyword(s):  
Bioactive Glass ◽  
Porous Structure ◽  
Pore Structure ◽  
Porous Scaffold ◽  
Pluronic F127 ◽  
Porous Scaffolds ◽  
Freeze Casting ◽  
Promising Candidate ◽  
Complete Replacement

AbstractThe citrate-based thermoset elastomer is a promising candidate for bone scaffold material, but the harsh curing condition made it difficult to fabricate porous structure. Recently, poly (1, 8-octanediol-co-Pluronic F127 citrate) (POFC) porous scaffold was creatively fabricated by chitin nanofibrils (ChiNFs) supported emulsion-freeze-casting. Thanks to the supporting role of ChiNFs, the lamellar pore structure formed by directional freeze-drying was maintained during the subsequent thermocuring. Herein, bioactive glass (BG) was introduced into the POFC porous scaffolds to improve bioactivity. It was found the complete replacement of ChiNF particles with BG particles could not form a stable porous structure; however, existing at least 15 wt% ChiNF could ensure the formation of lamellar pore, and the interlamellar distance increased with BG ratios. Thus, the BG granules did not contribute to the formation of pore structure like ChiNFs, however, they surely endowed the scaffolds with enhanced mechanical properties, improved osteogenesis bioactivity, better cytocompatibility as well as quick degradation rate. Reasonably adjusting BG ratios could balance the requirements of porous structure and bioactivity.

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