Advanced Materials Research Vol. 496

Abstract: With the development of science and technology, the requirements on the properties of new materials was increasing, the research and production of carbon fiber arriving an advanced stage. In the field of sports, carbon fiber composite material was widely used in sports equipment, this study illustrates the unique advantages of carbon fiber composite materials applied to sports apparatus, reveals the important role of carbon fiber and its composites on the modern sports development by describing the molding technology and typical examples

Abstract: An optimal preventive maintenance scheduling model for deteriorating structures is presented. The random initial damage and the cumulative damages are quantitatively measured with the statistical distribution of a dominant fatigue crack size in the structure. The preventive maintenance for the structure in service is assumed to be possible only at a series of discrete times. By taking into account the costs of structure failure and preventive maintenance, a minimum cost rate criterion is established to determinate the optimal time for preventive maintenance. Finally, an illustrative example is given

Abstract: A plasma electrolytic oxidation (PEO) ceramic coating process was used to form ceramic MoS2/oxide coatings on aluminum. The tribological properties of the PEO-MoS2 coatings were evaluated by sliding wear tests under the dry and lubricate conditions at the room temperature. The test results showed that the solid lubrication MoS2 can be integrated into the coatings for friction reduction. The role of solid lubrication in reducing friction coefficient has been exhibited more significantly in the oil test condition than in the dry test condition.

Abstract: The ashless 2,4-bis-dipropylamino-6-(O,O’-dibuthyldithio- phosphate)-s-1,3,5- triazine (PrBT) and 2,4-bis-morpholinyl-6- (O,O’-dibuthyldithiophosphate) -s-1,3,5 -triazine (MoBT), were prepared and their tribological behaviors as additives in rapeseed oil(RSO) were evaluated using a four-ball tester. The worn surfaces of the steel balls were investigated by scanning electron microscopy and X-ray photoelectron spectroscopy(XPS). The results indicate that the additives possess good load-carrying capacities. Moreover, they both have good antiwear and friction-reducing property at relatively middle concentration(1~2 wt%) and under all test loads, and in some condition, these triazine derivatives can replace the zinc dialkylthiophosphate. The results of XPS analyses illustrate that the prepared compounds as additives in RSO forms a protective film containing inorganic sulfide, sulfate, oxidized compounds and organic nitrogen-containing compounds on the metal surface during the sliding process.

Abstract: The features of the pregnant woman's shoes design were analyzed based on ergonomics. Firstly, according to the group of pregnant woman foot's characteristics, three-dimensional foot-measuring instrument was used to measure the foot, the data of pregnant woman’s foot were collected and analyzed, the data of foot in designing of shoes were determined. Secondly, shoes market of pregnant woman were surveyed and analyzed to contrast between China and foreign status of pregnant woman shoes, to find the problems of pregnant woman's shoe design and to bring forward improvements. Finally, the sample of pregnant woman's shoes were designed and made, through the wearing tests of pregnant woman's shoes to attain the best scheme for pregnant woman, and build a set of system for evaluating comfort of pregnant woman’s shoes was built.

Abstract: Fertilizer applications to soil are widely known to be the most important anthropogenic sources to influence soil N turnover in agricultural ecosystems. More information is required on the relationships between soil organic N (SON) forms in order to predict the maintenance, transformation and stability of soil N. Accordingly, 15N-labeled (NH4)2SO4 (totally 200 kg N/ha) was applied to a maize crop throughout the entire growing period to investigate the distribution and the dynamics of fertilizer-derived N in hydrolyzable-NH3 fraction by measuring the labeled N in them. The accumulation of 15N in hydrolyzable-NH3 fraction was time-dependent although the total N concentration changed only slightly. The transformation of the residual fertilizer N to hydrolyzable-NH3-15N was maximal during the silking and grain filling stages, suggesting the fertilizer N was immobilized at an early stage during the growing period. The rapid decrease of 15N in hydrolyzable-NH3 pool indicated that hydrolyzable-NH3-15N was a temporary pool for fertilizer N retention and was able to release fertilizer N for uptake by the current crop

Abstract: Using TiO2-decorated graphene (TiO2-G) nanohybrids as the immobilized platform for redox protein, and selecting glucose oxidase (GOD) as model enzyme, the direct electrochemistry of GOD was investigated in this paper. By virtue of the synergetic effect between graphene and TiO2 nanoparticles, the direct electron transfer of GOD on the TiO2-G nanohybrids modified electrode was remarkably promoted with a rate constant of 3.24 s-1. Moreover, based on the decrease of the electrocatalytic response of the reduced form of GOD by dissolved oxygen, a glucose biosensor was developed, which showed a satisfactory analytical performance for glucose determination over an acceptable linear concentration range from 5×10−4 to 2×10−2 mol/L. All these results demonstrated the great significance of such TiO2-G nanohybrids for the immobilization of enzyme and other biomolecules.

Abstract: Novel anionic fluorinated polyacrylate emulsion (FLHA) was synthesized and characterized using Infrared spectrum (IR). Then it was used as waterproofing agent to treat wet blue leather and the effects of various parameters, such as dose of fluorinated acrylate emulsion, processing time, temperature, etc., on hydrophobic property of the treated crust leather were also investigated using single factor experimental method. Results showed that water contact angle (WCA) on the grain and flesh layers of the resultant leather had similar rule controled by dose of the FLHA, processing time and temperature and increased with augment of those factors. The most preferable processing parameters of the above factors were 6% (based on the weight of the treated wet blue leather), 60 minutes and 30 °C, repectively. Thus, WCA on the grain and flesh layers of the resultant leather could attain 130° and 136°.

Abstract: Novel cationic fluorinated polyacrylate latex was synthesized and characterized using Infrared spectrum (IR). Then it was utilized as waterproofing agent to treat wet blue leather and the effects of various parameters, such as dose of fluorinated acrylate latex, processing time, temperature, etc., on hydrophobic property of the treated crust leather were also investigated using single factor experimental method. Results showed that water contact angle (WCA) on the grain and flesh sides of the resultant leather possessed similar rule controled by dose of the CFBDH, processing time and temperature and increased with augment of those factors. The most preferable processing parameters of the above factors were individually 6% (based on the weight of the treated wet blue leather), 60 minutes and 30 °C. Thus, WCA on the grain and flesh sides of the resultant leather could attain 136° and 143°.

Abstract: A dodecyl/amino functionalized polysiloxane (RASO) was firstly prepared by copolymerization of octamethylcyclotetrasiloane (D4), aminopropylmethyldiethoxysilane (KH-551), dodecylmethyldimethoxysilane (HD-109), and hexamethydisiloxane (MM) under basic catalyst. Then novel carboxylated polysiloxane (RCAS) was prepared by reaction of RASO with maleic anhydride. Finally RCAS was emulsified with alkyl alcohol polyoxyethylene ether (AEO) to form RCAS emulsions which were utilized in leather waterproofing. The as-synthesized RCAS was characterized by FT-IR, 1H-NMR, TEM, and Particles size distribution (PSD) analyses, respectively and effect of dose of RCAS emulsion on hydrophobicity of the treated crust leather was also investigated in this work. Results showed that RCAS emulsion particles presented an uniform sphere with an average diameter of 96 nm. When dose of RCAS emulsion was larger than 6% (based on the weight of wet blue leather), the RCAS treated leather possessed better water-repellent property and water contact angle (WCA) on the grain side and flesh side of that could attain 130° and 138°, repectively.