Advanced Materials Research Vols. 706-708

Abstract: In this study, the pure nanocrystalline Cu columns were fabricated by the brush electrodeposition technique at 20°C and at different deposition current densities in the range of 200 240 mA cm^-2. The columns shows high strain rate sensitivity in the room temperature compressive test. In the tested strain rate range, the strength of the nanocrystalline Cu at 2% plastic strain increases from 660 MPa to 1500 MPa. The nanocrystalline Cu exhibits obvious flow softening behavior at high strain level, and the degree of the softening is related to the strain rate.

Abstract: In this work, thermogravimetry (TG) and Wallace plastometer were used to study the thermal-oxidative aging resistance properties of natural rubber (NR) dried by microwave and hot-air. Showed from the results, thermal degradation temperature, primary thermal-oxidative degradation temperature, the value of P0, PRI and VR for NR dried by microwave were higher than those of NR dried by hot-air; the thermal-oxidative aging resistance properties of NR vulcanizes dried by microwave improved significantly, and the rate of change for elongation at break (-26.76%) and tensile strength (-38.6%) of NR vulcanizes dried by microwave before and after aging were apparently higher than those of NR vulcanizes dried by hot-air, which were (-60.29%) and (-82.11), respectively.

Abstract: In order to get ultra-smooth surface without subsurface damage efficiently for fused silica, the atmospheric pressure plasma processing (APPP) is developed. It is based on chemical reaction between active radicals excited by plasma and workpiece surface atoms, so the subsurface damage caused by contact stress can be avoided and atomic-level precision machining can be achieved. In this paper, the influence on material removal function by the key factors of APPP including the flow rate of reaction gases, input power, and processing distance are discussed. In addition, by the regression model a quantitative mathematical model of the material removal function of the atmospheric pressure plasma processing on fused silica is established. And this model is verified by experimental data.

Abstract: In this paper, we got Ni-MWNTs through pretreatment of MWNTs and electroless plating of nickel, and observed the Ni-MWNTs and MWNTs with TEM and FTIR. In addition, we prepared Ni-MWNTs/EP and MWNTs/EP composites. The volume resistivity、permittivity and permeability of composites were measured. Results showed that the volume resistivity of Ni-MWNTs/EP was higher than MWNTs/EP’s when volume fraction was lower than 8%. The ε" of Ni-MWNTs/EP was larger than MWNTs/EP’s. It indicated that Ni-MWNTs/EP had better electromagnetic energy storing and consumption capacity. And the permeability of Ni-MWNTs/EP would increase with the increasing of Ni-MWNTs. Ni-MWNTs/EP had some ferromagnetism.

Abstract: Ni-P nanocrystalline and amorphous coating were fabricated by electroless deposition technique in the same bath except for varying complexing agent. Heat treatment at lower temperature was carried out to the two kinds of coatings above. The phosphorus content and organize structure of the as-deposited coatings was determined by means of inductively coupled plasma atomic emission spectrometry, X-ray diffractometer and transmission electron microscope. Moreover the effects of heat treatment and structure on microhardness and tribology property of coatings were studied by means of microhardness tester, friction and wear tester and scanning electron microscope. Outstanding tribology property of Ni-P nanocrystalline coating compared with the amorphous one owed to the fine nickel grains with a size of several nanometers. While the proper heat treatment process was found to be responsible for improved property of both coatings.

Abstract: In this work, the interaction between paclitaxel (PTX) and a designed peptide was investigated through AFM, CD and fluorescence spectroscopy. AFM images showed that the morphology of the self-assembling peptide with PTX addition had a remarkable change. Fluorescence data illustrated that PTX enhanced the fluorescence intensity of P1. The binding constants for the interaction between PTX and P1 in 25°Cand 35°Cwere 6.38×105 L/mol and 2.27×104 L/mol respectively. Moreover, thermodynamic analysis implied the main binding force between P1 and PTX was hydrogen bonds and vander Waals forces. CD results indicated that PTX caused an increase of unordered structure. Finally, a molecular modeling was proposed based on the research. The study will provide a reliable proof for designed peptide as a paclitaxel carrier for further research.

Abstract: Cleancool fiber is a new type of green functional textile materials that can biodegradation, these years more and more people pay great attention to it for its excellent properties of fast moisture-transmission , fast dry property and permanent anti-bacterial properties. On the basis of experimental examination, the length wise appearance and cross section appearance , the tensile properties, the moisture-absorbency, property ,acid resistance and alkali resistance etc of the cleancool fiber are test and studied. The conclusions gained in this paper have important reference value to the development of cleancool fiber product and its processing.

Abstract: Yield-thixotropy is an important time dependent rheological behavior of gelled waxy crude oil. In order to study the yield-thixotropic behavior of gelled waxy crude oil under cyclic shearing of linear increasing and decreasing of shear rate, four different types of waxy crude oil were studied experimentally by using RS150H rheometer. It is found that because the recovery rate of wax crystal structure is slow, study should be focus on the first loop. At a certain temperature, the hysteresis loop moves away from the share rate axis and the area of the loop becomes larger with increased rate of share rate sweep; and vice versa, the loop moves toward the share rate axis and the area of the loop becomes smaller with decreased rate of share rate sweep. And the yield stress is also reduced and the yielding time increased with decreased rate of share rate sweep. In addition, based on the experimental results an empirical correlation is developed to describe the relationship of yielding time and rate of share rate sweep.

Abstract: The relationship of the powders and binder system and forming process on the quality of the U-shaped proton conducting CaZr_0.9In_0.1O_3-α tubes was studied. The results showed that defect-free green bodies can be obtained under the conditions of the wax slurry containing 87.8% (mass percentage, the same below) proton conductor powders, 11% paraffin wax, 1% beeswax and 0.2% oleic acid, the wax slurry and mold temperature at 73°C and 30°C, the casting pressure and time at 0.5MPa and 15s. A reasonable wax removing schedule about the green bodies was put forward. At last the sintered samples were characterized by higher density and less shrink rate and distortion.

Abstract: Deep Cryogenic treatment is a new technology that was dated from the later middle of 20th century and gained widely utilization. It has been proven to be a efficient method for improving the mechanical properties and working life of the high speed steel (HSS) substantially by deep cryogenic treatment. This paper summarizes the cryogenic treatment and its mechanism on metal material. Moreover, the development process of deep cryogenic treatment on HSS and its current research at home and abroad were mainly introduced. Finally, some views and prospects of the industrialization of cryogenic treatment technology were putted forward.