Advanced Materials Research Vols. 194-196

Abstract: Pore structure of experiment alkali waste were investigated by Mercury Porosimetry, the influence of pore structure characteristics on their sulfur fixation performance were discussed, it can be found that little pores make a significant contribution to calcium utilization in the initial stage of reaction and at lower temperature, while bigger pores take effect in the later stage and at higher temperature, the range of effective aperture are different at different temperature, which respectively are from 0.005μm to 0.02μm at temperature from 1123K to 1223K and from 0.2μm to 0.3μm at temperature from 1223K to 1323K, the more pore in range of effective aperture, the better the sulfur fixation performance.

Abstract: Multi-walled carbon nanotubes (MWNTs) were modified with poly(N-isopropylacryl- amide-co-acrylic acid) (P(NIPAAm-co-AA)), and the modified MWNTs can be homogeneously dispersed in aqueous solution. In addition, the MWNTs were endowed with thermo-responsive at 33°C . The MWNTs switched reversibly between aggregated and well-exfoliated states by using temperature as a stimulus. Moreover, the introduction of acrylic acid to copolymerize with N-isopropylacrylamide could greatly enhance the dispersing ability of MWNTs.

Abstract: The splitting of segmented pie filaments in spunbond is a direct impact on the performance of final products. After splitting process, one primary filament is fractured into several micro-filaments which own excellent properties. This paper was to investigate effects of splitting on segmented pie filaments when they were processed with different splitting technologies. Scanning Electron Microscope (SEM) micrographs were used for characterizing the splitting effect in order to discuss optimal splitting techniques to manufacture segmented pie spunbonded nonwovens. The results indicated that spunlacing and alkali deweighting can get a better splitting effect than the other process.

Abstract: In order to fabricate flake-shaped core-shell micro particles (FCMP) with light weight efficiently, deposition on diatomite was carried out by thermal decomposition. The deposition of Fe on diatomite was accomplished by thermal decomposition of pentacarbonyl iron (Fe(CO)₅). The scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDS), and X-ray diffraction (XRD) are used to make clear their morphology microstructure, chemical composition, and crystal structure. The average diameter of FCMP is around 40μm, and the average aspect ratio is over 15. The main chemical composition of the FCMP is Fe, Si, Oand C. The XRD result revealed that crystal structures of the FCMP is close to α-Fe. The vibrant sample magnetometer (VSM) result revealed that the FCMP belong to soft magnetic material. The density test results show that the density of FCMP is close to the 2.6, which is lower than the density of pure carbonyl iron powder.

Abstract: The purpose of this paper is to investigate a new type of resin of chitosan cerium encapsulated green tea extract microspheres (RCCM-GTE) prepared by the reversed-phase suspension cross-linking polymerization and study the scavenging activity against DPPH free radical. The results showed that RCCM-GTE was a type of deep brown-yellow spherical resin with smooth surface and it presented uniform and narrow particle size distribution as determined by the Laser Particles Sizer. The Inductively Coupled Plasma-Atomic Emission Spectrometry (ICP-AES), Fourier Transform Infrared Spectroscopy (FT-IR) and differential scanning calorimetry (DSC) study demonstrated that there was cerium existing in RCCM-GTE. The polyphenolic compounds existed in RCCM-GTE and the total content of polyphenolic compounds encapsulated in RCCM-GTE was found to be 92.550±1.145 μg/g. It is considered that the good antioxidant activity of RCCM-GTE was the comprehensive results of the action of tea polysaccharide-protein conjugate, polyphenolic compounds, cerium and Schiff base chitosan. Investigation showed that a lot of extracts coming from agriculture and food industry contain reactive components of polyphenolic compounds and polysaccharides. It can be effective in protection of human beings from free radical damage if these extracts are directly or after the extraction and purification added to food as natural food antioxidant or they are prepared micospheres reacted with some biopolymers through coordination as a health food. Then the emerging area of research on encapsulating GTE in chitosan cerium resin must have a broad developing prospect.

Abstract: This research developed a micro-silicon cell filter using MEMS fabricating technology, which has constant filtering channel size, uniformed distribution, and good surface quality. Blood cell filtering experiment was carried out by applying pressure injection and the filtering quality was studied via cell counting. The experimental results demonstrates that flat plate filter can implement blood cells filtering separation, and erythrocyte recycling rate reaches 90% with the 4～5m in filtering size and 0.1L/min injection flow-rate fulfilling the requirement of blood cells separation. Increasing the flow-rate can improve filtering efficiency to a certain degree but has little effect on erythrocyte recycling rate, because micro array filter is insensitive to back pressure in contract to the filled filter.

Abstract: Carbon nanolines on carbon cloth were prepared via a two-step method at 600-900°C for 30 min in a horizontal chemical vapor deposition (CVD) furnace, with Ni nano-particles as catalyst and ethylene as carbon source. XRD and SEM were used to examine the as-synthesized products. The result indicates that the pyrolysis temperature of 900°C is the most suitable to produce the carbon nanolines. The dimension and length of carbon nanolines are about 20nm and are well distributed, respectively. The as-synthesized carbon nanolines/carbon cloth is convenient and low-cost for adsorption materials of wastewater treatment, reinforcement of carbon/carbon composites. The growth mechanism of the as-synthesized carbon nanolines is simplely discussed.

Abstract: A new adsorption agent, nanosized strontium titanate immobilized on the silica gel G (GSTO) was prepared, and it was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The ability of the new adsorption to remove heavy metal Pb, Cd, Zn, Cu, Ni and Mn from water samples was assessed. The research results displayed that adsorbent has the highest adsorption capacity for Pb, Cd, Zn, Cu, Ni and Mn in ions mixture system. Optimal experimental conditions including pH and contact time have been established. Desorption studies were carried out successfully with diluted HNO3 solutions. Thus, nano-strontium titanate immobilized on the silica gel G is favorable and useful for the removal of these heavy metal ions, and the high adsorption capacity makes it a good promising candidate material for Pb, Cd, Zn, Cu, Ni and Mn removal.

Abstract: Bicone-shaped and monodispersed nanoparticles of Cu₂S have been prepared by a simple reaction between CuO suspension, NH₂OH•HCl and (NH₄)₂S in the presence of gelatin at 5°C. The products were characterized by X-ray powder diffraction, transmission electron microscopy and UV-visible absorption spectroscopy. The band gaps are estimated to be 1.98 eV and 2.03 eV according to the results of optical measurements of bicone-shaped and monodispersed nanoparticles of Cu₂S.

Abstract: This study was carried out to test the feasibility of a mixture of cement, waste concrete powder (WCP) for their permeability, compressive strength and flexural strength. Various samples with different mass ratios of this mixture were tested to determine their permeability, compressive strength and flexural strength. The best proportions of 10% WCP, 90% cement and 0% NaOH excitant with a value of 51.3MPa was obtained at 28d, and the flexural strength can reach 8.6MPa. Moreover, the samples containing 10% WCP , 90% cement and 1% Na₂SiO₃ excitant also showed quite good compressive strength and flexural strength with values of 45.1MPa and 8.3MPa, respectively, while the samples containing 30% WCP and 70% cement showed low compressive strength and flexural strength.