Advanced Materials Research Vols. 239-242

Abstract: A facile method has been developed to synthesis hierarchical nickel oxide with spherical particle morphologies, high surface area of 234 m²/g and narrow pore distribution at 3.25 nm by controlled thermal decomposition of the nickel nitrate hydroxide precursors. The as-obtained products were well characterized by XRD, SEM, TEM (HRTEM), SAED, FTIR and N2 adsorption-desorption measurement. It was shown that the hierarchical NiO microsphere with the diameter about 2.0 μm is composed of hexagonal nanoparticles with mesoporous structure. The prepared mesoporous materials were used as an adsorbent to remove the Congo red pollutant contained in the waste water, and they exhibited more favorable adsorptive properties than the mesoporous alumina powders with same surface area due to its special structural features.

Abstract: Fiber Bragg grating (FBG) sensors were applied for the monitoring of impact damage of composites. The FBG sensors were embedded into glass fiber reinforced vinyl resins (GFRP) laminates. Sectional appearance of the optical fiber embedded in composites was got by optical microscope. The composites were impacted by a drop-weight impact tester. The impact energies were 0.1J, 0.2J and 3J. The whole process was monitored by two different demodulators.

Abstract: Polymer electrolyte membrane based on Nafion and zirconium oxide (ZrO₂) was developed via film casting method. The content of ZrO₂ (1.0, 2.0, and 3.0 wt.%) was incorporated with Nafion solution to prepare Nafion-ZrO₂ composite membranes. Recast Nafion membrane was used as reference material. All of the prepared membranes have been subjected to both physical and chemical characterizations such as Fourier transform infra-red (FT-IR), scanning electron microscopy (SEM), differential scanning calorimetry (DSC) analysis, water uptake rate (WUR) and conductivity measurements. The Nafion-ZrO₂ composite membranes were found to possess high thermal stability (T_g= 188 - 192°C) and conductivity (0.30 – 0.93 S cm^-1). This study demonstrates the possibility of developing Nafion-ZrO₂ composite membrane as promising polymer electrolyte membrane for fuel cell operated at medium temperature and low humidity.

Abstract: Removed at Author Request due to Unrepeatable Results

Abstract: In this article, Pt nanoparticles protected by 1-dodecanethiol (DDT) were self-assembled on iron surface forming mixed self-assembled films. Those nanoparticles were prepared in aqueous solution and transferred from water phase to toluene phase. The self-assembled films of nanoparticles protected by DDT were prepared on iron surface. The nanoparticles were characterized by UV-vis spectroscopy. Electrochemical impedance spectroscopy (EIS), polarization curves, X-ray photoelectron spectroscopy (XPS) were applied to characterize the self-assembled films on iron surface.

Abstract: Using formaldehyde as a crosslinking reagena novel cross-linked chitosan resin was synthesized by orthogonal. The resin material with good properties of sphericity and acidresistivity can be prepared under the optimal experimental conditions, which are found to be 1:6 for the ratio of chitosan and formaldehyde, 60°C for the temperature, 1 h for the reaction time, 640r/min for the stirring rate and 9 for the pH, and the cross-linking rate under the optimal conditions is 401.86%. SEM shows the surface morphology changes of raw materials and products; IR of the raw materials and products shows that the reaction occurs mainly on the amino and the hydroxyl of chitosan, and TG shows that the crosslinking reaction of chitosan can change its heat resistance.

Abstract: Lysozyme molecularly imprinted polymer membranes(MIMs) were prepared using polyacrylamine as matrix. Direct detection of fluorescence intensity of absorbed lysozyme(Lyz) on the MIMs was achieved for the fast detection of lysozyme. The surface morphology of polymer was characterized by SEM. Adsorption time and rebinding solution pH were optimized to improve recognition ability of MIMs for lysozyme. The results showed that the MIMs had a high selection and recognition ability for the lysozyme protein.

Abstract: Nanomaterials have been demonstrated to possess novel characteristics that can be applied in developing new packaging with better properties than packaging produced with ordinary micromolecules materials. Such developments include the production of packaging with improved mechanical or barrier properties, which applied to the food industry will extend the shelf life of a food, thereby expanding its marketing potential. The present study discussed on approaches to reduce low molecular weight chemicals residue in flaxible films via modification by nano-SiO₂. The results of the study showed that the cast-polypropylene films with nano- SiO₂ particles have good adhesiveness of ink and peeling strength, especially low adsorption behavior of solvents in inks or adhesives, and low friction coefficient in absence of any slip agents.

Abstract: A ternary Eu(III) complex with salicylic acid (Hsal) and o-phenanthroline (phen) was synthesized and then incorporated into silica matrix by sol-gel method. The luminescence behavior of the complex in silica gel was studied compared with that of the pure complex by means of emission, excitation spectra and thermogravimetic analysis. The results indicate that the complex Eu(sal)₃(phen) in silica gel shows fewer emission lines than pure Eu(sal)₃(phen) and the luminescence intensity ratio of the ⁵D₀ → ⁷F₂ transition to the ⁵D₀ → ⁷F₁ transition is lower than that of the latter. The thermal stability of Eu(sal)₃(phen) is enhanced greatly through the introduction of the complex into silica matrix.

Abstract: Tool wear is a major contributor to the dimensional errors of a workpiece in precision machining. Tool wear modeling is an effective way to predict the tool wear loss in milling process. In this paper, different milling conditions are estimated as the input variables, tool wear loss is estimated as the output variable, and projection pursuit regression (PPR) method is proposed to establish the relationship between the input and the output variables. A real-time tool wear loss estimator is developed based on the PPR model, the experimental and estimated results are found to be in satisfactory agreement with average error lower than 10%.