Self-cleaning surfaces have excelled in recent years in energy and environmental fields. In particular, in solar energy area, these surfaces are used to avoid soiling accumulation on photovoltaic (PV) modules. So far ...
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Self-cleaning surfaces have excelled in recent years in energy and environmental fields. In particular, in solar energy area, these surfaces are used to avoid soiling accumulation on photovoltaic (PV) modules. So far TiO2 has been widely used due to its photocatalytic activity and photo-induced superhydrophilicity. However, this oxide has some limitations since it reduces the glass transmittance and it rapidly reestablish the water contact angle in dark environments. In order to circumvent these limitations, composites TiO2/SiO2 have been proposed. For photovoltaic application, besides a good transparency in the wavelength region 300–1800 nm and self-cleaning properties, the coating should also present long durability and adequate adhesion to endure the outdoor conditions. Aiming at developing a coating with these properties, in this work, TiO2/SiO2 composites containing different titanium content have been synthesized and compared with pure TiO2 films in relation to adhesion, transparency and hydrophilicity. Both films have been deposited over low iron float glass substrates by sol–gel dip-coating technique and different calcination temperatures (400, 500, 600°C) and Si/Ti molar rates (Si86Ti14, Si40Ti60) have been considered. TiO2/SiO2 films showed higher transmittance in visible range compared with pure TiO2. TiO2/SiO2 films showed superhydrophilic character before and after ultraviolet irradiation, with water contact angles near to 0°. Furthermore, as predicted, TiO2/SiO2 films could keep the superhydrophilic character in dark environments, in contrast with pure TiO2 films. Both TiO2 and TiO2/SiO2 films exhibited good adherence and it is shown that higher calcination temperatures and higher titanium content enhance such property. All f
Ferroelectric ceramics have a wide range of industrial applications. While components can be formed through simple 'press and sinter' approaches, there is an increasing need for more flexible processing method...
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Polymer nanocomposites have been extensively investigated over the past two decades, resulting in a wide range of applications because of their excellent performance. Halloysite, a type of naturally occurring aluminos...
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Through evolutionary processes, biological composites have been optimized to fulfil specific functions. This optimization is exemplified in the mineralized dactyl club of the smashing predator stomatopod (specifically...
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The present work focuses on the fabrication of environmental friendly ZnO nanocrystals and chitosan/cellulose films hosting ZnO nanoparticles (NPs) as an attempt to produce nanocomposites with enhanced bactericidal ca...
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The present work focuses on the fabrication of environmental friendly ZnO nanocrystals and chitosan/cellulose films hosting ZnO nanoparticles (NPs) as an attempt to produce nanocomposites with enhanced bactericidal capacity. The solution casting method was used to fabricate the chitosan/cellulose blend films. Highly monodisperse ZnO nanoparticles were synthesized using Zinc acetate and Triethylene glycol (TEG) via a modified Polyol route. ZnO crystal size was controlled by the heterogeneous nucleation approach. Optical properties of ZnO nanoparticles were studied by UV–vis spectroscopy and Photoluminescence Spectroscopy (PL) techniques. The nanoparticles’ size and morphology were determined by Transmission Electron Microscopy (TEM) and X-ray diffraction (XRD), respectively. Obtained results confirmed the effectiveness of the size-controlled synthesis employed. The chitosan/cellulose/ZnO nanocomposites were characterized by Fourier Transform–Infrared spectroscopy (FTIR) and X-ray diffraction (XRD) methods. The mechanical properties of produced bare and ZnO-bearing composites were determined from stress-strain tests. The Standard Plate Count and the Halo Zone methods were used to evaluate the bactericidal properties of the ZnO nanoparticles, chitosan/cellulose blend films and chitosan/cellulose/ZnO nanocomposites against Escherichia coli (ATCC 35218).
We report a facile hydrothermal synthesis in base solution for shape/size-controlled ceria(CeO2) nanocrystals and CeO2-ZrO2 solid solutionCeO2 nanocrystals in the shape of nanorods, nanotubes, or nanocubes with reacti...
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ISBN:
(纸本)9783038351023
We report a facile hydrothermal synthesis in base solution for shape/size-controlled ceria(CeO2) nanocrystals and CeO2-ZrO2 solid solutionCeO2 nanocrystals in the shape of nanorods, nanotubes, or nanocubes with reactive {110} and {200} faces can be produced using this hydrothermal methodWe found that hydrothermal reaction temperature is a critical parameter to control the shape and size of ceria nanocrystalsAbove 210 oC, high resolution transmission electron microscopy studies revealed that the CeO2 nanocubes expose predominant {200} crystal planesMicroscopic investigation showed that the CeO2-ZrO2 solid solutions synthesized using this method had high crystallinity, and compositional homogeneity, and improved low-temperature reducibility.
A facile technique is herein reported to fabricate three-dimensional （3D） polymeric porous scaffolds with interior surfaces of a topographic microstructure favorable for cell adhesion. As demonstration, a well-known...
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A facile technique is herein reported to fabricate three-dimensional （3D） polymeric porous scaffolds with interior surfaces of a topographic microstructure favorable for cell adhesion. As demonstration, a well-known biodegradable polymer poly（lactide-co-glycolide） （PLGA） was employed as matrix. Under the porogen-leaching strategy, the large and soft porogens of paraffin were modified by colliding with small and hard salt particles, which generated micropits on the surfaces of paraffin spheres. The eventual PLGA scaffolds after leaching the modified porogens had thus interior surfaces of microscale roughness imprinted by those micropits. The microrough scaffolds were confirmed to benefit adhesion of bone marrow stromal cells （BMSCs） of rats and meanwhile not to hamper the proliferation and osteogenic differentiation of the cells. The insight and technique might be helpful for biomaterial designing in tissue engineering and regenerative medicine.
This special section of ASME Journal of Nanotechnology in engineering and Medicine focuses on reporting state-of-the-art nanoscale materials, devices, and systems for advanced biosensing, biomanipulation, and biofabri...
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This special section of ASME Journal of Nanotechnology in engineering and Medicine focuses on reporting state-of-the-art nanoscale materials, devices, and systems for advanced biosensing, biomanipulation, and biofabrication. Such nanoscale materials, devices, and systems can be organic, inorganic, and hybrid, and their applications for advanced biosensing, biomanipulation, and biofabrication have generated significant impact for important biology and biomedical applications. Nanotechnology has seen rapid progress in recent years, with advanced capabilities to generate and manipulate precisely engineered nanoscale organic and inorganic materials and their assemblies pointing toward the emergence of disruptive functionalities for diverse biological and biomedical applications. Furthermore, nanofabricated devices and systems such as nanofluidics, nanoelectromechanical systems, and nanophotonic structures with critical dimensions comparable to the molecular scale open up new possibilities for direct observation, manipulation, and analysis of biomolecules, thus providing a novel basis for ultrasensitive and high-resolution sensors and diagnostic systems. Nanoscale surface patterning...
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