Bio-silica issued from diatom, a microalgae, is attracted increasing attention in material science thanks to its peculiar nanoarchitecture and related properties with versatile applications. The present work is a deep...Bio-silica issued from diatom, a microalgae, is attracted increasing attention in material science thanks to its peculiar nanoarchitecture and related properties with versatile applications. The present work is a deep analysis on morphological and chemical properties of bio-silica issued from fossil origin (diatomaceous earth) and living one (algal paste). An optimization in purification protocol was performed to obtain multiparous bio-silica from its raw media with keeping its original shape entirely. Multiple characterization methods as scanning electronic microscopy (SEM), infrared spectroscopy, x-ray diffraction (DRX), X-ray photoelectron spectroscopy (XPS), energy dispersive X-ray spectroscopy (EDX), nitrogen adsorption and inverse gas chromatography (IGC), were used to check the purification protocol efficiency as well as to gather accurate information on morphology and chemical composition of diatom material obtained in large amount.展开更多
The study examines the impact of microstructure and polymethyl methacrylate(PMMA)grafting on the degradability of Zn–Mg alloys.The mechanical properties ofa Zn alloy containing 0.68 wt%Mg and extruded at 200◦C are en...The study examines the impact of microstructure and polymethyl methacrylate(PMMA)grafting on the degradability of Zn–Mg alloys.The mechanical properties ofa Zn alloy containing 0.68 wt%Mg and extruded at 200◦C are enhanced for degradable load-bearing applications,addressing a crucial need in the field.The materialexhibits a bimodal grain size distribution that is random texture,consisting of secondary phases,grains,and sub-grains.With an elongation to failure of 16%,theyield and ultimate tensile strengths are 325.9 and 414.5 MPa,respectively,and the compressive yield strength is 450.5 MPa.The“grafting-from”method was used to coat a few micrometers thick of PMMA on both bulk and scaffold Zn alloys to mitigate the corrosion rate.The last one is aporous structure,with a porosity of 65.8%,considered as in the first approach of an orthopedic implant.After being immersed for 720 h,the PMMA-grafted bulkalloy’s corrosion rate decreased from 0.43 to 0.25 mm/y.Similarly,the scaffold alloy’s corrosion rate reduced from 1.24 to 0.49 mm/y.These results indicate that themethod employed could be used for future orthopedic applications.展开更多
文摘Bio-silica issued from diatom, a microalgae, is attracted increasing attention in material science thanks to its peculiar nanoarchitecture and related properties with versatile applications. The present work is a deep analysis on morphological and chemical properties of bio-silica issued from fossil origin (diatomaceous earth) and living one (algal paste). An optimization in purification protocol was performed to obtain multiparous bio-silica from its raw media with keeping its original shape entirely. Multiple characterization methods as scanning electronic microscopy (SEM), infrared spectroscopy, x-ray diffraction (DRX), X-ray photoelectron spectroscopy (XPS), energy dispersive X-ray spectroscopy (EDX), nitrogen adsorption and inverse gas chromatography (IGC), were used to check the purification protocol efficiency as well as to gather accurate information on morphology and chemical composition of diatom material obtained in large amount.
文摘The study examines the impact of microstructure and polymethyl methacrylate(PMMA)grafting on the degradability of Zn–Mg alloys.The mechanical properties ofa Zn alloy containing 0.68 wt%Mg and extruded at 200◦C are enhanced for degradable load-bearing applications,addressing a crucial need in the field.The materialexhibits a bimodal grain size distribution that is random texture,consisting of secondary phases,grains,and sub-grains.With an elongation to failure of 16%,theyield and ultimate tensile strengths are 325.9 and 414.5 MPa,respectively,and the compressive yield strength is 450.5 MPa.The“grafting-from”method was used to coat a few micrometers thick of PMMA on both bulk and scaffold Zn alloys to mitigate the corrosion rate.The last one is aporous structure,with a porosity of 65.8%,considered as in the first approach of an orthopedic implant.After being immersed for 720 h,the PMMA-grafted bulkalloy’s corrosion rate decreased from 0.43 to 0.25 mm/y.Similarly,the scaffold alloy’s corrosion rate reduced from 1.24 to 0.49 mm/y.These results indicate that themethod employed could be used for future orthopedic applications.
