Abstract: In recent years, the production and application of plastic planting tray is subject to more restrictions, many scholars at domestic and abroad are actively to develop biodegradable biomass packaging materials. Based on these analysis and summarization, make use of treated sludge, waste paper fibers and industrial waste wood chips as raw materials, adding other environmental protection additives to prepare a kind of biomass foaming material which has low quality, low density and good mechanical properties. Text result shows that it is feasible to use this method to make environmental material, and its density is 0.43g/cm3, the compressive strength is 10.64MPa.
Abstract: In this study, organo-montmorillonite was utilized as an additive for the fabrication of the nanostructured membrane via electrospinning process.The purpose of this study is to investigate the performance of 95% PSF and 5% O-MMT blend in terms of its adsorption capacity towards MB dye in wastewater and comparing it to pure PSF membranes. Pure PSF and 5% O-MMT blend were immersed in the simulated wastewater at different time intervals (1, 5, 12, 24 and 48 hours), and the change in MB dye concentration was observed by UV-Vis absorbance reading. To determine the mechanism of adsorption, the data obtained were subjected to pseudo-first order and pseudo-second order kinetic models, and were fitted to Langmuir, Freundlich and Temkin adsorption isotherms to determine the adsorption equilibrium data. The results show that the adsorption efficiency was improved by 5.32%.
Abstract: Polymeric membranes infused with clays have attracted researchers for it poses a great potential in water treatment applications. In this study, polysulfone (PSF) has been infused with organo-montmorillonite (O-MMT) clay to fabricate membranes through electrospinning and were subjected into different characterizations to find out the effect of adding the clay to the polymer.Four sampleswith different amounts of O-MMT have been fabricated (Pure PSF, 1% O-MMT, 3% O-MMT and 5% O-MMT). The fiber morphology, fiber diameter,surface chemical composition, hydrophobicity, and mechanical properties of these samples were studied. Preliminary investigationhas revealed that shallow pores and smaller fiber diameter were formed with increasing O-MMT concentration. Molecular interaction between the PSF and O-MMT was also revealed through the FT-IR analysis. With regards to contact angle, there are no significant differences between the measurements for each PSF/O-MMT blend. Improvements in the mechanical properties of the samples were also observed as the O-MMT concentration increases.
Abstract: The oxyhalides Ba2InO3F, Ba2InO3Cl, and Ba2InO3Br were synthesized using the solid state method. It was found that the increasing of halide ion radius leads to the increase of lattice parameters and also caused to redistribution of indium-oxygen bond lengths. The possibility of water uptake was proved by thermogravimetry measurements. The presence of different forms of oxygen-hydrogen groups in the structure of hydrated oxyhalides was indicated by infrared spectroscopy.
Abstract: Nanocrystalline Fe/Al2O3 and Fe-Ce/Al2O3 catalysts doped with various amounts of cerium were prepared using the one-step flame spray pyrolysis (FSP) technique. The characterization of the catalysts was measured by several methods such as X-ray diffraction, nitrogen physisorption and hydrogen temperature programmed reduction (H2-TPR) techniques. The results revealed that the FSP-made catalyst exhibited the characteristic pattern of FeAl2O4 phase without any phases of aluminum or iron oxide. In addition, cerium (Ce) dopant did not alter crystal structure at low content. However, 7 wt% content of cerium dopant resulted in the formation of ceria (CeO) and iron oxide (Fe2O3) phase. The catalytic performance of the FSP-made catalyst was tested in carbon dioxide hydrogenation for selective production of long chain hydrocarbon, and was compared to conventional impregnation-made catalysts. In the comparison, the FSP-made catalyst exhibited lower catalytic activity but possessed a higher long chain hydrocarbon selectivity. After doping with Ce, the catalytic activity was improved while the hydrocarbon selectivity was decreased and shifted to the short chain hydrocarbon product. In the case of conventional-made catalysts, the activity remained unchanged but the hydrocarbon selectivity was decreased. Among all catalysts, the FSP-made Fe-Ce/Al2O3 catalyst with 3% Ce-promoted catalyst exhibited the best performance in terms of selectivity to long chain hydrocarbon.
Abstract: CO2 conversion into valuable chemicals is an attractive option to deal with the increasing CO2 concentration in the atmosphere. In this study, Cu/ZnO catalyst was synthesized on multi-walled carbon nanotubes (MWCNTs) and Al2O3 supports via incipient wetness impregnation method. The physicochemical properties of the catalysts were investigated using TEM, XRD, N2 adsorption-desorption analysis, H2-TPR and XPS. The performance of the synthesized catalysts in a CO2 hydrogenation reaction was evaluated in a fixed-bed reactor at 503 K, 22.5 bar and H2:CO2 ratio of 3:1. TEM images showed that Cu/ZnO nanoparticles were deposited inside the CNTs as well as on the exterior walls of the CNTs. The average CuO crystallite size on Al2O3 and CNTs supports was 15.7 and 11 nm, repectively. Results of H2-TPR studies showed that the reducibility of the catalyst was improved on the CNTs support. XPS analysis confirmed the presence of Cu2+ in the samples, however, the binding energy of Cu 2p3/2 peak on the Al2O3 support was shifted to higher value compared to that of CNTs support. Products obtained from the CO2 hydrogenation reaction in the presence of these catalyts were methanol, ethanol, methyl formate and methane. The CO2 conversion of around 23% was obtained using both types of catalysts, however, Cu/ZnO on CNTs resulted in higher yield of methyl formate compared to that of Al2O3-supported catalyst.
Abstract: The dextran-covered poly (lactic acid) (PLA) polymeric nanoparticles were prepared by a nanoprecipitation process for the encapsulation of monocaprin (MC) or monolaurin (ML). The concentration of PLA/MC or ML was varied to evaluate the best condition for preparation. The miscibility of various PLA/MC or ML blends was studied using differential scanning calorimetry. The result showed that at concentrations of 50/50 wt/wt, the PLA/ML blend was partly miscible and the nanoparticle suspension produced large amounts of macroscopic aggregates after nanoprecipitation. Conversely, the miscibility of PLA/MC blends progressively increased with increasing amounts of PLA. Therefore, the best concentration to encapsulate the MC was the PLA/MC 90/10 (wt/wt), according to the miscibility results.
Abstract: The design of current talus implant are focusing too much on mechanical simplicity and usually based on certain population which tends to ignore the anatomically difference between populations. An anatomically talus implant design is known can reduce the contact pressure but one of the constraints for designing implant anatomically is to get bone parameters. This is due to the difficulty to get enough volunteers in getting bone parameters using hazardous method (X-ray or CT scan) .Thus, the talus implant (TI) for particular population was developed based on artificial neural network (ANN) prediction. By using Finite Element Method (FEM), numerical models that include mainly the talus bone and the talus implants are created to compare the contact pressure distribution of the newly develop talus implant with the three different kind of current talus implant designs (BOX, STAR & TNK). For FEM results, only BOX and the newly develop talus implant exceeded the contact stress recommended for the superior articular surface compared to the others. The results also showed that the stress increased near the resected surface. Thus, it is agreed that excessive bone resection may not support the force at the ankle which consequently may contribute to early loosening and subsidence of the talus implant. It is concluded that the excessive bone resection can be avoided by perfectly match talus implant which only can be achieved by designing talus implant for a particular population.
Abstract: Mesoporous magnetic hydroxyapatite nanocrystals (MPmHAp NCs) were successfully prepared through one-step co-precipitate process. From the results, the MPmHAp NCs kept HAp lattice structure and had short rod-like morphology with superparamagnetic property. The size of MPmHAp was 60-80 nm in length and 10-20 nm in width. It also had excellent cell viability when coculture with 3T3 cells in vitro. In addition, MPmHAp NCs not only possessed mesoporous architecture with high surface area for effective drug loading capacity and drug release. The above results indicate that the biocompatible MPmHAp NCs showed great potential as multifunctional therapeutic nanoagent for biomedical application.
Abstract: Tension-tension fatigue tests were conducted using ultrafine-grained commercially pure Titanium (Ti) plates fabricated by multi-directional forging (MDFing). The MDFed pure Ti plates with the thickness of 1 mm were developed aiming at dental implant application. The fatigue properties of MDFed pure Ti plates were superior to those of the conventional rolled pure Ti plates. The higher fatigue strengths in MDFed plates could be attributed to the much finer grains evolved by MDFing. Fatigue crack initiated from specimen surface, when number of cycles to failure was shorter than 106 cycles. In the high cycle fatigue (HCF) region, however, subsurface crack initiation with typical fish-eye feature was recognized in the MDFed pure Ti plate in spite of the thin thickness. Fractographic analyses revealed that no inclusion existed at the center of fish-eye. The subsurface crack initiation mechanism could be related to the inhomogeneity of microstructure with some coarse grains in the inner part of the plate.