Advanced Materials Research Vol. 549

Abstract: Coir fiber is one of the tropical fruit fibers, the effective use of coir is not comprehensive now and the phenomenon of resources waste still exists. Full study of the advantage characteristics of coir has important significance for the expansion of the application field of coir resources. This article determines the light porous characteristics of coir from the micro-morphological characteristics. Through the prediction model research of the sound absorption coefficient of the porous fiber materials, the optimization density and the optimization thickness ranges can be got for the coir density board, so as to guide the optimization design of the sound absorption performance of coir density board. The changing rule of the sound absorption coefficient of the coir density board has been got by adopting the wave impedance tube method and the sound absorption coefficients by adding 5cm air gap has also been researched. The results of the experiments confirm that coir density board can be used as a secondary noise absorption material; the practical applications of coir density board are as the lightweight wall, the car interior trim or seat filling materials and the shipping cabins materials, to reduce the corresponding environment noise.

Abstract: Metal materials have been used in aero industry widely because of its excellent characteristics. So its internal defects are very important. Ultrasound detection technology for detecting metal materials internal defects is related to piezoelectric ultrasonic sensor. This has a few of disadvantages. So the double wavelength optical fiber F-P ultrasound sensing system is designed in this paper. The ultrasound detecting experiment devices for internal defects of metal materials is established based on the optical fiber F-P sensing system. Experimental research of detecting the internal defects is developed. The experimental results show this sensor can detect the ultrasound signals effectively. And it’s proved that this method can be effective used in the internal defect of metal materials.

Abstract: The ultrasonic dispersion method and mechanical blending method were used to modify the calcium sulphate whisker (CSW). Modified CSW were characterized with scanning electronic microscopy (SEM). The different modified calcium sulphate whisker (CSW)/natural rubber (NR) composites have been prepared respectively, and then the properties of the composites were studied. The results showed that the effect of CSW modified by the ultrasonic dispersion method was better than mechanical blending method, and the CSW/NR composites modified by the ultrasonic dispersion method had the optimum properties.

Abstract: For high print quality, halftone dots should have minimal dot gain and sharp, circular edges, the receiving surface must have a line, high-porosity structure and be hydrophilic. Paper surface chemistry requirements for good inkjet print quality are so unconventional that new paper grades for printing should be specially designed. In this paper, the printability, coating structure and the color reproduction after printing of coated paper was studied.

Abstract: In this work, the effects of four kinds of additives including polyethyleneimine, carboxymethylcellulose, guar gum, and chitosan on the retention performance of reconstituted tobacco pulp and strength character of final base sheet were discussed. The results showed that the filler retention efficiency and first pass retention efficiency increased by 17.7% and by 5.8% at chitosan dosage of 0.2%, respectively. Moreover, the tensile index showed a distinct increase in chitosan retention system. The largest strength index was found to be in carboxymethylcellulose retention system, the tensile index was increased from 6.5 N•m/g to 8.67 N•m/g, and the wet tensile index was increased from 0.37 N•m/g to 0.51 N•m/g.

Abstract: The different paper has the different Surface Characteristic, which has the different influences on the printing color Reproduction. Through the paper printability, the color gamut experiments of digital printing, The influence of surface characteristics of paper on digital printing color reproduction was analyzed according to color rendering ability, The results indicated that the printed matter had better color efficiency, greater color gamut and smaller hue error and grayscale which had higher paper smoothness and glossiness, the higher paper whiteness is in favor of color reproduction. The surface characteristic of paper limits color reproduction. To ensure printing quality, should choose better color efficiency of paper.

Abstract: A novel colorimetric sensor based on BMPA derivative was designed and synthesized. The sensor displayed high selective and sensitive recognition of Cu²⁺ in aqueous DMSO solution via an obvious color change from yellow to pink. The color change can be attribute to form a complex with Cu²⁺ with C=O and N-H bonds. Based on this principle, an analytical method was developed and successfully used in the determination of the copper content in actual sample.

Abstract: Fired bricks were prepared by using iron tailings from Inner Mongolia as the main material based on analysis of its basic characterization and investigate the performance and mechanism of fired bricks at different firing temperature. The results showed that the density and compressive strength increased with the rise of firing temperature, while the water absorption decreased. The analysis demonstrated that calcite was decomposed into CaO and CO₂ at 800°C completely by DTA-TG and XRD, which lead to the increase of pore and decrease of density. Kaolinite was decomposed into metastable quartz and metakaolin at about 850°C and then hornblende transformed into quartz and hematite with the rise of temperature. The SEM photographs showed that the glass phase was increased and the sheetlike fabric was decreased when the firing temperature rose to 1100°C. The glass phase was filled into the pores contributing to the decrease of the porosity and making the bricks more compact which help to improve the bulk density and compressive strength. The glass phase was concerned with the reaction, which can help the grain diffusion and thus increase the speed of reaction.

Abstract: The method for characterizing the modified filler directly by oil absorption ratio was studied. The oil absorption ratio of heavy CaCO₃ is decreased with the increase of modifier amount in the early stage, but then a slow decline was observed after an inflexion point. The optimal amount of the modifier was calculated at the inflexion point of the curve of oil absorption ratio. The results showed that the optimal amount of the modifier for 400 mesh, 700 mesh, 1000 mesh and 2000 mesh CaCO₃ was 0.8%, 0.9%, 1.0% and 1.5%, respectively. The CaCO₃ powder was treated with the modifier at the optimal amount, then the masterbatch was prepared by the modified CaCO₃. The melt-flow rate experiment for the masterbatch showed that the direct characterization method for the CaCO₃ powder was efficient when its particle size was between 400 and 1000 mesh.

Abstract: The corresponding development of resonance mass beam pressure sensor in decades is introduced and a serial of theory analysis is executed. The advantages and disadvantages are studied on the resonance mass pressure sensor. Through the finite element analysis software ANSYS, the stress and strain distribution situation is obtained in this paper. Under the outside overload pressure situation, we find that the linearity of the resonance mass beam pressure sensor presents a declining situation, but in a small range. From the total performances of sensor, it still keeps a good condition. Under the 260 times of rang pressure, the sensor chip deformation is only 14.5um, which is a kind of very small deformation situation. That is to say the resonance polycrystalline silicon mass beam sensor designed here has a high reliability under the outside overload pressure situation.