Advanced Materials Research Vols. 535-537

Abstract: We propose a novel type of photonic crystal fiber with low fattened dispersion and high nonlinearity for four wave mixing. The dispersion and nonlinearity coefficient are investigated simultaneously by using the full vectorial finite element method with anisotropic perfectly matched layers. The optimized result has been obtained by adjusting the design parameter of the proposed fiber, which has dispersion is -1.53 ps•nm−1 km−1 at wavelength of 1.55μm, and in addition the relatively small effective mode area of 2.23μm2 is obtained at the same wavelength, which will induce higher nonlinearity coefficient is close 54.8 W-1• km-1 at the wavelength of 1.55μm. The proposed PCF is suitable for applications as a chromatic dispersion controller, dispersion compensator, or as candidate for the nonlinear optical systems because of its small effective mode area.

Abstract: Because of its small average droplet size, low carrier gas flow rate and the droplets not easy to splash etc, the ultrasonic atomizing spray technology is particularly suitable for making photoresist films. In order to get a reasonable spray scan interval, the parabolic deposition model was used to study the relationship between the spray overlap width and the photoresist film thickness and uniformity, and it can be concluded that the thickness of the film increases and the thickness variance of the film decreases oscillatorily along with the increasing of the spray overlap width.To obtain good uniformity of the photoresist film, the dimensionless overlap width should be at least greater than 0.15.

Abstract: The injection molding of magnetic powder could cost-effectively mass-produce net shape magnets. The manufacture technology and properties testing method of composite powder and bonded NdFeB magnets from injection molding were described in detail. The effects of content of binder, additives and magnetic powder on the magnetic property, mechanical property and fluidity of injection molding magnets were investigated. Furthermore, the effect mechanism was revealed microcosmically. The injection molding bonded magnets were prepared by using the MQP-B rapidly quenching NdFeB magnetic powder and polyamide 12. The magnetic properties are: Br=0.539T, Hcb=345.37kA/m, Hci=681.02kA/m, and (BH)max=47.37kJ/m3.

Abstract: The giant magnetoresistance thin film of (Ni60Co30Fe10/Cu) trilayer were grown onto Si (100) substrate by dc-opposed target magnetron sputtering (dc-OTMS) technique. The growth parameters are: temperature of 100 0C, applied voltage of 600 volt, flow rate of Ar gas of 100 sccm, and growth pressure of 5.2 x10-1 Torr. The effects of Cu layer thickness and NiCoFe layer thickness on giant magnetoresistance (GMR) property of (Ni60Co30Fe10/Cu) trilayer were studied. We have found that the giant magnetoresistance (GMR) ratio of the sample was varied depend on the non-magnetic (Cu) layer thickness. The variation of Cu layer thickness presents an oscillatory behavior of GMR ratio. This oscillation reflects the exchange coupling oscillations between ferromagnetic and antiferromagnetic states, which are caused by an oscillation in the sign of the interlayer exchange coupling between ferromagnetic layers. The GMR ratio is change with increasing of NiCoFe layer thickness and presents GMR ratio of 70.0 % at tNiCoFe = 62.5 nm.

Abstract: The synthesis of Fe3O4/AMPS magnetic composite material by solution polymerization method is introduced in this study. Results of structure, morphology and magnetic properties show that the solution polymerization technology is an effective method for synthesizing core-shell structure oxide/polymer magnetic composite material. The Fe3O4 prepared by chemical precipitation process is uniform nanoparticle and the size is about 10 nm. The synthesized Fe3O4/AMPS is large irregular nanoparticles, and the average diameter is about 30 nm. The FT-IR analysis suggests that electrostatic adsorption of probably contribute to the formation of core-shell Fe3O4/AMPS magnetic composite. The product Fe3O4/AMPS performs a typical superparamagnetic property with an absence of hysteresis in the M–H loop, implying a broad prospects of its potential application as target material.

Abstract: In this paper, poly [(2-methoxyl-5-octyloxy) Phenylene Vinylene] (MO-PPV) was synthesized by Gilch route under ultrasonic irradiation. The molecular structure, thin film and luminescence property examined through FT-IR, SEm, AFM, UV-Vis spectroscopy and fluorescent spectroscopy, the results showed that the ‘cavitations effect’ caused by the ultrasonic irradiation not only accelerate the reaction speed but also reduce structural defects of the polymer thin film, the synthesized MO-PPV is free of gelatins which is harmful for the polymer’s thin films act as active layer in polymer light-emitting diodes (PLED).

Abstract: On the base of electromagnetic theory of gratings, we analyse the effects of both of two important parameters of classical blaze grating in Littrow mount to diffraction efficiency, and the two parameters are optimized for obtaining highest diffraction efficiency. It is presented that not only blaze angle but apex angle affect diffraction efficiency. The investigation has been performed on the design and fabrication of classical blaze grating which has high diffraction efficiency.

Abstract: A new chemiluminescence system was built by using gadolinium as sensitizer, and the analysis capabilities of this system was tested as below. The method is based on chemluminescence of Ce (IV)-SO₃^2- sensitized by Gd³⁺-OFLX. The effects of some critical experimental conditions were discussed and the optimum conditions for chemluminescence emission were investigated. The linear relationship between the relative chemiluminescence intensity and the concentration of OFLX is in the range of 2×10^-9 g/mL～5×10^-7 g/mL with a detection limit of 1.0×10^-9g/mL .The relative standard deviation is 2.8% (n=11) for a level of 5.0×10^-7 g/mL. The method has been applied to the analysis of OFLX in tablets with satisfactory results.

Abstract: Co₂Z type planar hexaferrite doping of Gd³⁺ 2CoO·3BaO ·xGd₂O₃·(10.8-x) Fe₂O₃ is made with common production process of cermet. The paper studies the influence of Gd₂O₃ doping quantity on microstructure and magnetic performance of Co₂Z type planar hexaferrite. The result indicates that Gd³⁺ doped Co₂Z type ferrite still keeps structure of Z type planar hexagonal, when the doping quantity x=0.025, the magnetic performance in ultrahigh frequency will get improved, the initial permeability can grow to 16, and the cut-off frequency will also relatively reduce to the lowest value 1.965GHz.

Abstract: An effective numerical method to predict quantitatively the relation between the dimensionless figure of merit of the state-of-the-art thermoelectric materials with the temperature was investigated by look around for some fitting mathematical functions. The simulative results agree with the observed data very well that the minimum correlation coefficient and the maximum average relative errors between them are 0.9767 and 4.35 % respectively. The high light of this work is that the regular pattern of the dimensionless figure of merit of the state-of-the-art thermoelectric materials dependence temperature appears Gaussian. This conclusion may be an available tip to the the theoretical physicist to build or modify some theoretical model that used to explain the physical mechanisms of the thermoelectric materials.