Zinc oxide aerogel monoliths were obtained via an epoxide addition sol–gel process. The aerogels are mesoporous with high surface areas. Low-temperature annealing of the aerogel monolith yields a highly crystalline material which exhibit enhanced photoluminescence while retaining the inherent characteristics of the original aerogel.
Oliveira, A. A. R. D., Gomide, V. S., Leite, M. D. F., Mansur, H. S., Pereira, M. D. M. 2009. Effect of Polyvinyl Alcohol Content and After Synthesis Neutralization on Structure, Mechanical Properties and Cytotoxicity of Sol-Gel Derived Hybrid Foams. Materials Research. 12(2): 239-244.
Sol-gel synthesis of zinc oxide nanoparticles using …
In summary, nanoparticles of ZnO crystals were produced by using a simple mixing technique of precipitation. ZnSO4 and NH4OH have been as precipitating agent in aqueous solutions. A mother solution prepared from 25 mL of the Zinc Sulfate solution (0.2 M) and 50 mL of purified water was controlled within temperature about 50-60ºC. Then, the sample was dried at 60ºC for 8 h in oven. This method employed an inexpensive and reproducible process for the large-scale synthesis of Nano-sized ZnO flakes. Eventually, it was found that ZnO nanoparticles have the average of particle size about 30 nm. SEM images, EDX and XRD pattern indicated that the prepared ZnO nanoparticles have uniform structure and high purity. The leading characteristics of ZnO nanoparticles can be considered in the number of defects, optical properties, stability, electron transport, and other electronic properties. The varied structures allow for numerous applications in different device types. Nano ZnO flakes can be used for new opportunities for anode materials as Zn/Ni batteries and other energy-storage devices.
, they synthesized ZnO with an average crystallite size of 21 nm
N2 - Zinc oxide (ZnO) has excellent potential to be used in water and wastewater treatment, either as a photocatalyst or in membrane incorporation. In this work, the synthesis of smaller ZnO NPs through a sol-gel approach was enhanced by applying Taguchi design. Recent work on the synthesis of ZnO NPs was optimised to ensure relatively smaller sized particles were obtained. Several parameters of the synthesis process, such as molar ratio of starting materials, molar concentration and calcination temperature, were selected as they have the dominant effects on the particle size of ZnO NPs. Each of these factors was studied at three levels. Various analyses such as ANOVA, model adequacy check and numerical optimisation were performed to validate the predicted optimal model. As a result, the optimum conditions were estimated at a molar ratio of 50:50, an oxalic acid molar concentration of 0.1. M and a calcination temperature of 400. °C. Experiments were performed to validate the model at the selected conditions and the particle size was around 20. ±. 2. nm according to XRD analysis, which was in good agreement with the predicted size of 19.8. nm. In addition, the actual size of the synthesised NPs was confirmed by TEM analysis, with the average size of 13. ±. 5. nm. Hence, the Taguchi design was an essential tool in the optimisation of ZnO NP synthesis process with fewer experimental runs and relatively low cost approach.
Large-Scale Synthesis of TiO2 Nanorods via …
Zak, A. K., Abrishami, M. E., Majid, W. H. A., Youseﬁ, R., Hosseini, S. M. 2011. Effects Of Annealing Temperature On Some Structural And Optical Properties Of ZnO Nanoparticles Prepared By A Modiﬁed Sol–Gel Combustion Method. Ceramics International. 37: 393-398.