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23 results on '"Fayyaz, Abdolali"'

12. Three dimensional polyurethane/ hydroxyapatite bioactive scaffolds: The role of hydroxyapatite on pore generation.

Author

Nasrollah, Seyyed Ahmad Seyyed, Najmoddin, Najmeh, Mohammadi, Mohsen, Fayyaz, Abdolali, and Nyström, Bo

Subjects
HYDROXYAPATITE, BONE regeneration, FIELD emission electron microscopy, CELL membranes, YOUNG'S modulus, TISSUE engineering
Abstract

Fabrication of a suitable scaffold with highly interconnected and well‐distributed pores for cell proliferation and growth in the field of bone tissue engineering is of high importance. In this study, three‐dimensional porous polyurethane (PU) scaffolds, with 0, 15, 25, and 32 wt% hydroxyapatite (HA), were fabricated. In this regard, HA was incorporated into PU constituents prior to starting in‐situ polymerization of PU. Porosity and density measurement of the scaffolds revealed that higher amount of HA in the scaffolds led to increasing the former and decreasing the latter quantity. The field emission scanning electron microscopy (FESEM) images revealed that by increasing HA content, the pore size showed a descending trend while the number of pores increased. This would be attributed to the type of interactions between HA and PU, and the role of HA in pore formation. Mechanical test revealed that Young's Modulus of the samples was reduced by increasing scaffold porosity caused by the increase of HA content. Bioactivity tests in the simulated body fluid (SBF) showed the ability of scaffolds forming apatite precipitates. MTT assay showed that by increasing HA content, MG63 osteoblast cell viability increased and FESEM images revealed proper attachment of the cells to the scaffold surface. [ABSTRACT FROM AUTHOR]

Published
2021
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23. Characterization of Fabricated Feedstock Using Nano Powders and a Water-Soluble Binder in Micro Metal Injection Molding

Author

Javad, Rajabi, Muhamad, Norhamidi, Sulong, Abu Bakar, Hasyimah, Aziz, Fayyaz, Abdolali, and Zakaria, Hafizawati

Abstract

Micro metal injection molding has become the promising method in powder metallurgy research in order to fabricate small-scale intricate parts in an influential process and competitive cost of mass production. Stainless steel 316 L powders with powder size of 150 nm and 5 μm were mixed with a binder with a water soluble component which consisted of a major fraction of water soluble Polyethylene Glycol (PEG), a minor fraction of polymethyl-methacrylate (PMMA) and some stearic acid has been used as a surfactant. This work aims to investigate the rheological properties of a feedstock which are efficiently characterised by capillary Rheometry to measure apparent viscosities at different temperatures and shear rates. Results obtained by the varying feedstock characteristics, when viscosity decreases by increasing of shear rate at certain temperature feedstock should have a pseudoplastic behaviour. Melt viscosity of the feedstock was decreased by adding nanoscale powders. The reduced (n) values at high temperature with addition of nanoparticles indicated a possible increase in the shear-thinning behavior.

Published
2008
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