Advanced Materials Research Vols. 287-290

Abstract: Iron oxide black and iron oxide red magnetic sensitive to polyvinly-alcohol hydrogel has been fabricated using physical cross-linking method. The mechanical properties and swelling characteristics have been studied for different content, magnetic sensibility were tested using the vibration sample magnetometer, experiment results show that iron oxide red hydrogel has better mechanical properties, Percentage of swelling and loss rate of water of the polyvinly-alcohol hydrogel decrease with the increasing of the magnetic particles content, the change tendency is very like, cross-linking is increased with performance the swelling performance decreasing; PVA and Fe3O4 has good response from the SEM photo and IR spectrogram; its magnetic properties is better.

Abstract: The result of its static adsorption to Fermentation Liquid shows that the new reshaping resin. LX-18G-1 does so well in absorbing the Erythromycin and separating Pigment, its adsorption quantity reach 184ku/mL and the separation for pigmentosus just only 7.8%, comparing with 100ku/ml and 36.5% of the Amberlite XAD-16 resin made by US. Rohm & has Company.

Abstract: New prosthetic nucleus which consisted of ultrahigh molecular weight polyethylene (UHMWPE) jacket and polyvinyl alcohol (PVA) hydrogel core was prepared and studied. The hydrogels with similar size were encased in polyethylene jacket of different dimension. Studies indicate that with the decrease of jacket dimension, swelling time of prosthetic nucleus increases, the equilibrium water content and volume change ratio decrease. Differential Scanning Caborimetry (DSC) analysis shows that increasing the jacket dimension results in a slight increase of non-freezable bond water and significant increase in free water. The prosthetic nucleus with larger jacket has better stress relaxation property due to the plasticization of non-freezable water. These results suggest that the dimension ratio of jacket to core at 1.19-1.35 is the most suitable for artificial nucleus pulposus

Abstract: Rodlike ammonium tetrathiomolybdate has been synthesized via ultrasonic assistance using monocrystal ammonium dimolybdate and ammonium sulfide as raw materials. The phase compositions, purity of as-synthesized products were characterized by x-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), laser Raman spectroscopy(LRS). The thermal decomposition mechanism of ammonium tetrathiomolybdate was deduced by thermoanalysis. It is shown that brownish-red rhombic ammonium tetrathiomolybdate crystal with high purity could be obtained at 60°C for 1h under relatively mild conditions.

Abstract: Three-layered zeolite LTA-filled poly (vinyl alcohol) (PVA) composite membranes have been fabricated for water removal from highly concentrated ethanol solution by means of pervaporation. Higher separation factor and higher fluxes are both achieved after adding zeolite 3A, 4A and 5A. Through evaluating separation factor and permeation flux, separation performances of the composite membranes are elucidated in terms of the zeolite pore size and processing temperature.

Abstract: A convenient method to synthesize 2-(7-fluoro-1H-imidazo[4,5-b]phenazin-2-yl)- phenol derivatives 3a-d with substitute (s) X (X = H, CH₂OH, Br, Cl) via the reaction of 7-fluoro- phenazine-2,3-diamine and bisulfite addition products of 2-hydroxy aromatic aldehydes in DMF solution with a yield of 80-85% was developed. Meanwhile, the ultraviolet absorption and the fluorescent spectra of these o-hydroxy derivatives of 1H-imidazo[4,5-b] phenazin were measured in methanol and one fluorescence band with a peak wavelength of 550nm with a Stokes shift around 134-141 nm for 3a-d was observed.

Abstract: Fluid flow is mathematically expressed as mapping. A dynamic system is strong mixing under certain conditions. The cohesive mixing flow is often in laminar state. By introducing chaos into a laminar mixing system, the mixing performance can be effectively improved. Residence Time Distribution, Lyapunov Exponent, Decay of Correlation, and Mixture Homogeneity are often employed to evaluate the mixing performance of cohesive mixing. New measuring techniques of flow field study, including Particle Tracking Velocimetry, Particle Image Velocimetry, Planar Laser Induced Fluorescence, etc., are quite useful in studying cohesive mixing process. Euler-Lagrange approach and Euler-Euler one are two approaches for modeling and simulation of the cohesive mixing.

Abstract: Lithium extraction from seawater and brine is an important approach to solving the short supply of lithium resource. Development of ion-sieve adsorption materials is the key of realizing industrial application of lithium extraction from seawater and brine with high ratio of magnesium to lithium. Although the synthetic process is complicated, with plenty of influencing factors, levels, and large amounts of data, this research successfully optimized the synthesis conditions by orthogonal experiment and statistical analysis. The achievements will lay solid foundation for the development of lithium adsorption materials.

Abstract: This research focuses on absorption of Cr(VI) in wastewater by powdered activated carbon, and determines the effect of pH, initial concentration of solution, amount of powdered activated carbon, adsorption time, adsorption temperature, etc, on adsorption of Cr(VI) in wastewater. The results show that the treatment of 100mL containing Cr(VI) wastewater with concentration of 50mg/L will work best in the conditions of 0.35g powdered activated carbon, pH=3.0, 298K, and 1hour oscillatory adsorption.

Abstract: Different degrees of high degree of substitution cationic starch (HCS) were prepared and applied in paper coating. Effects of HCS on coating properties and coated paper properties were investigated, and the comparison of effects of HCS and PDMDAAC was made. The results show that the best amount of HCS in coating formula is between 2% and 4%. When the amount of HCS is 4%, whiteness of coated paper was the highest. The color density was the highest when the amount of HCS is about 4% and the degree of substitution is 0.64. HCS with degree of substitution 0.849 is better than PDMDAAC in some respects, and the print image density achieved satisfactorily.