Artificial photosynthesis is a new approach to generate sustainable energy. In order to constrain reaction solution in a solid state structure and increase the reaction efficiency in artificial photosynthesis reaction...Artificial photosynthesis is a new approach to generate sustainable energy. In order to constrain reaction solution in a solid state structure and increase the reaction efficiency in artificial photosynthesis reactions, we presented two methods to fabricate the chitosan scaffold with interconnected micro channels as construction structure of a novel artificial photosynthesis device. We built 3D chitosan structure with a home-made heterogeneous 3D rapid prototyping machine, and we used lyophilization method to generate the micron-scale pores inside the chitosan scaffold. Chitosan in acetic acid could achieve different viscosities. We found a proper chitosan recipe to construct 3D scaffold by our own rapid prototyping machine. Optional support material sodium bicarbonate was used in printing 3D scaffold for holding the printed structures, and the results images indicate that this method can make the scaffold stronger and more stable.展开更多
The effects of mesogen-jacketed liquid crystalline polymer poly(dipropyl vinylterephthalate)(PDPVT) on the mechanical and thermal properties of diglycidyl ether of bisphenol-A(DGEBA) epoxy resin were investigated by i...The effects of mesogen-jacketed liquid crystalline polymer poly(dipropyl vinylterephthalate)(PDPVT) on the mechanical and thermal properties of diglycidyl ether of bisphenol-A(DGEBA) epoxy resin were investigated by impact test, tensile test and thermogravimetric analysis(TGA). The mechanism underlying the enhancement of mechanical properties of epoxy resin was studied using 1D wide-angle X-ray diffraction(WAXD) and scanning electron microscope(SEM). It was found that the mechanical properties of 1 wt%–5 wt% PDPVT/DGEBA composites were significantly improved compared to neat epoxy resin. Especially, the epoxy resin with 3 wt% PDPVT had the greatest increase in mechanical properties, with the impact strength, tensile strength and elongation while breaking increased by 87%, 59% and 174%, respectively. The increased mechanical strength was due to the fact that PDPVT maintained liquid crystalline phase in cured PDPVT/DGEBA composites, which would blunt the crack tip and prevent crack propagation. Moreover, PDPVT had slight effect on the thermal stability properties of epoxy resin.展开更多
文摘Artificial photosynthesis is a new approach to generate sustainable energy. In order to constrain reaction solution in a solid state structure and increase the reaction efficiency in artificial photosynthesis reactions, we presented two methods to fabricate the chitosan scaffold with interconnected micro channels as construction structure of a novel artificial photosynthesis device. We built 3D chitosan structure with a home-made heterogeneous 3D rapid prototyping machine, and we used lyophilization method to generate the micron-scale pores inside the chitosan scaffold. Chitosan in acetic acid could achieve different viscosities. We found a proper chitosan recipe to construct 3D scaffold by our own rapid prototyping machine. Optional support material sodium bicarbonate was used in printing 3D scaffold for holding the printed structures, and the results images indicate that this method can make the scaffold stronger and more stable.
基金financially supported by the National Natural Science Foundation of China(51343008)
文摘The effects of mesogen-jacketed liquid crystalline polymer poly(dipropyl vinylterephthalate)(PDPVT) on the mechanical and thermal properties of diglycidyl ether of bisphenol-A(DGEBA) epoxy resin were investigated by impact test, tensile test and thermogravimetric analysis(TGA). The mechanism underlying the enhancement of mechanical properties of epoxy resin was studied using 1D wide-angle X-ray diffraction(WAXD) and scanning electron microscope(SEM). It was found that the mechanical properties of 1 wt%–5 wt% PDPVT/DGEBA composites were significantly improved compared to neat epoxy resin. Especially, the epoxy resin with 3 wt% PDPVT had the greatest increase in mechanical properties, with the impact strength, tensile strength and elongation while breaking increased by 87%, 59% and 174%, respectively. The increased mechanical strength was due to the fact that PDPVT maintained liquid crystalline phase in cured PDPVT/DGEBA composites, which would blunt the crack tip and prevent crack propagation. Moreover, PDPVT had slight effect on the thermal stability properties of epoxy resin.
