Advanced Materials Research Vols. 756-759

Abstract: Gold nanorods (AuNRs) are prepared through seeded growth approach. Synthesis parameters of the amount of cetyltrimethylammonium bromide (CTAB), and concentration of ascorbic acid (AA) were studied. It is found that as the concentration of CTAB increases, the yield of NRs increases. As the concentration of AA increased from 0.05M to 0.2M, LSP shifts to longer wavelength but upon further increasing the concentration, LSP shifts back to shorter wavelength. A linear relationship between LSPR wavelength and surrounding medium dielectric constant is obtained, which is in good agreement with the theoretical results.

Abstract: The study of NiFe magnetic nanoparticles (MNPs) has a wide range of applications because of the unique composition and its magnetism. In this paper, a brief review is presented on the different methods for the preparation of the bimetallic magnetic nanoparticles, along with our preliminary work on the synthesis of this kind of alloy nanoparticles.

Abstract: C-Cu composites reinforced with carbon fiber cloth were prepared by hot pressing sintering technology. Wear test was conducted with copper ring under dry friction condition. The effects of load and sliding speed on friction and wear properties of the composites were studied respectively and meanwhile the wear mechanism was analyzed by combination with the morphologies of worn surfaces. The results show that carbon fiber cloth improves the wear resistance of composites and fiber grindings possess the ability of alleviating adhesive wear. These make abrasion loss small in the range of normal load and sliding velocity. With increasing of the load and sliding speed, friction coefficient and abrasion loss also increase. The main wear mechanism is transformed from slight adhesive wear into delamination wear and is accompanied by abrasive wear and slight oxidative wear at the same time.

Abstract: We developed a device for automatic closed friction and analyzed its test results in this paper, which showed the influence factors in the test methods of textile negative ion occurrence amounts. The textile negative ion occurrence amounts in different time stages were tested in this process; the analysis of its influence of temperature and humidity has certain reference significance for improving testing device for testing textile negative ion concentration, on the basis, functional textiles were also studied. Finally, we put forward the influence factors in the test methods of textile negative ion occurrence amounts.

Abstract: The dry sliding wear tests were carried out on T15m high speed steel with the M-2000 type wear testing machine, and studied the influence of wear performance due to the different loads and speeds on T15m, SEM was employed to analysis the worn surface morphology to discuss the mechanism of wear and tear. The results demonstrated that the mechanisms as well as the wear rate of T15m high speed steel were under different loads and speeds were different. Under the load of 100N, it is oxidative wear, while abrasive wear is the main reason for 150N and 200N. However, under 250N it is converted to serious oxidative wear and fatigue wear.

Abstract: With the application of 405nm semiconductor laser as a light source, this paper presents the fluorescent characteristics of Hematoporphyrin monomethylether and Hematoporphyrin in the following five solvents: Dimethyl sulfoxide, Dimethylformamide, Tetrahydrofuran, Ethyl acetate and Deionized water. Meanwhile, the absorption spectrums of both above Porphyrins in the five solutions are obtained by halogen lamps light source.

Abstract: We study the preparation of thin film on the glass substrate with the method of dip coating, which is based on methanol and MTMS as raw materials, making them form silica aerogel by sol-gel method. Scanning electron micrographs (SEM) show that such a film possesses a porous three-dimensional network structure. The high porosity and low refractive index determine that the transmittance rate can reach 90%. The prepared film also exhibited apparent hydrophobic effect, with the contact angle of 156.3°and rolling angle of less than 10°. The transparency and superhydrophobic of the film make it suitable as multifunctional coatings for many application fields including solar cells, cellphones and a variety of electron device.

Abstract: Based on SiGe virtual substrate technology, a high-performance strained NMOS is obtained. By growing 2~3μm SiGe relaxed layer, 100~200nm strained SiGe layer and 20nm strained silicon layer, and also forming a P-well by multiple implantation technology, a surface strained NMOS is fabricated. Finally, Measured results shown that drain-source current and the low field maximal mobility of the strained NMOS are enhancement of up to 190% at Vgs=3.5V, which is almost three times to the value of common Silicon NMOS and is also better than the 170% reported in public.

Abstract: The truck bias tyre bead wire coating is improved, by adjusting the rubber system, reduce the bead wire wrapped filler, appropriately increasing the amount of carbon black, and using resorcinol-formaldehyde donor-silica and cobalt salt adhesion system, the strength and adhesion property of bead wire coating were improved, bead burst and the prick-out of bead wire were decreased, the bad ratio of tire caused by bead problems was reduced from 1.3% to below 0.1%, significantly improve the actual service life of tyre.

Abstract: On the basis of the theoretical study and application of ordinary steel-encased concrete composite beam, this paper will focus on a new high-strength steel-encased concrete composite beam, and mainly studies high-performance steel Q420 and Q460, as well as high-strength concrete C60 and C80. Besides, an experimental study of 5 simply-supported beams is made, and the load-deflection curves of new SCCB are analyzed. The calculation formula of load which changes with depth of section and bending strength of the cross section is also analyzed. It is suggested that the calculated results announced should be identical with the experimental results.