Metal
Mechanical properties and bioactivity of porous PLGA/TiO2 nanoparticle-filled composites for tissue engineering scaffolds
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Poly(lactide-co-glycolide) (PLGA) foams and PLGA/titanium dioxide (TiO2) nanoparticle-filled composite foams (porosity > 90%) were produced by thermally induced solid–liquid phase separation (TIPS) and subsequent solvent sublimation. The scaffolds exhibit bimodal and anisotropic pore structures, with tubular macropores (approximately 100 μm in diameter) interconnected by a network of micropores. Quasi-static compression testing and dynamic mechanical analysis were carried out and the results were correlated to the microstructure observed by SEM, confirming the strong anisotropic behaviour of the foams. A study of the collapse mechanism of the foams porous structure revealed that when compressed in the main pore direction, the scaffolds failure mechanism involves an initial “accommodation” of large regions of the porous structure, followed by the collapse of individual pores in different modes. The bioactivity of the scaffolds was demonstrated by immersion in simulated body fluid (SBF) for up to 28 days. Formation of hydroxyapatite crystals on the scaffold surface was confirmed by X-ray diffraction analysis.
This article originally appeared in Composites Science and Technology 67, 2007, Pages 1139-1147.
Sign up or log in to your free Materials Today account to download the full article.
Sign up or log in to your free Materials Today account to download the full article.
Poly(lactide-co-glycolide) (PLGA) foams and PLGA/titanium dioxide (TiO2) nanoparticle-filled composite foams (porosity > 90%) were produced by thermally induced solid–liquid phase separation (TIPS) and subsequent solvent sublimation. The scaffolds exhibit bimodal and anisotropic pore structures, with tubular macropores (approximately 100 μm in diameter) interconnected by a network of micropores. Quasi-static compression testing and dynamic mechanical analysis were carried out and the results were correlated to the microstructure observed by SEM, confirming the strong anisotropic behaviour of the foams. A study of the collapse mechanism of the foams porous structure revealed that when compressed in the main pore direction, the scaffolds failure mechanism involves an initial “accommodation” of large regions of the porous structure, followed by the collapse of individual pores in different modes. The bioactivity of the scaffolds was demonstrated by immersion in simulated body fluid (SBF) for up to 28 days. Formation of hydroxyapatite crystals on the scaffold surface was confirmed by X-ray diffraction analysis.
This article originally appeared in Composites Science and Technology 67, 2007, Pages 1139-1147.
Sign up or log in to your free Materials Today account to download the full article.
Metal
Ex-Europe scrap price in Turkey moves up sharply
Two new deep sea scrap deals have been disclosed in the Turkish market.
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Source: https://www.steelorbis.com/steel-prices/steel-prices-market-analyses/scrap-and-raw-materials/ex_europe-scrap-price-in-turkey-moves-up-sharply-1187817.htm
The Indian government has set up a $3.5 billion special fund to facilitate completion of stalled affordable housing projects across the country, a government official said on Thursday, February 25.
The sources said that fund will be utilized to complete an estimated 16 affordable housing projects involving 4,000 homes and deliver them to customers during the fiscal year 2020-21.
The government has estimated that housing projects worth $63 billion have been stalled across the country, with builders unable to service their debt liabilities and banks forced to write off loans.
The Indian government has set up a $3.5 billion special fund to facilitate completion of stalled affordable housing projects across the country, a government official said on Thursday, February 25.
The sources said that fund will be utilized to complete an estimated 16 affordable housing projects involving 4,000 homes and deliver them to customers during the fiscal year 2020-21.
The government has estimated that housing projects worth $63 billion have been stalled across the country, with builders unable to service their debt liabilities and banks forced to write off loans.
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