• Electrical and optical properties of the hybrid TiO2 nanocrystals - MEH-PPV thin filmsElectrical and optical properties of the hybrid TiO2 nanocrystals - MEH-PPV thin films

    Abstract. Recently, the conjugated polymer – inorganic nanocomposites have been increasingly studied because of their enhanced optical and electronic properties as well as their potential application in developing optoelectronic devices. In this study nanocomposite materials thin films based on poly [2-methoxy-5-(2’-ethyl-hexyloxy)-1,4-phenylene ...

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  • Efficient generation of coherent stokes field in hydrogen gas-filled hollow core photonic crystal fibresEfficient generation of coherent stokes field in hydrogen gas-filled hollow core photonic crystal fibres

    Abstract. We study the coherent Stokes generation in a transient stimulated Raman scattering regime by Hydrogen gas-filled hollow-core photonic crystal fibres configuration. The temporal and spatial evolution of the pump and Stokes field envelopes as well as the coherence and population inversion are numerically calculated. The Stokes generation...

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  • Effect of spontaneous polarization charges on the electron mobility in ZnO surface quantum wellsEffect of spontaneous polarization charges on the electron mobility in ZnO surface quantum wells

    Abstract. We present a theoretical study of the effect due to spontaneous polarization of ZnO on the low-temperature mobility of the two-dimensional electron gas (2DEG) in a ZnO surface quantum well (SFQW). We proved that for the O-polar face this causes an attraction of electrons by the positive charges bound on the surface, while for the Zn-po...

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  • Effect of sm and mn co-Doping on the crystal structure and magnetic properties of BiFeO3 polycrystalline ceramicsEffect of sm and mn co-Doping on the crystal structure and magnetic properties of BiFeO3 polycrystalline ceramics

    Abstract. The crystal structure, phonon vibration, microstructure, and magnetic properties have been investigated in multiferroics Bi0:9Sm0:1Fe1−xMnxO3 for x = 0:02 – 0:1. The structural analysis by XRD and Rietveld refinement suggests that Mn doping compounds crystallize in the polar R3c rhombohedral symmetry (isostructural with BiFeO3). Raman a...

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  • Effect of pre-alloy composition on the content of ferromagnetic phase of MnBi melt spun ribbonsEffect of pre-alloy composition on the content of ferromagnetic phase of MnBi melt spun ribbons

    Abstract. The rare-earth-free hard magnetic material MnBi is potential for permanent magnet high-temperature applications with the ferromagnetic phase formed at low temperature (noted as a Low Temperature Phase – LTP). Up to now, the MnBi powders with high LTP content and coercivity have usually been prepared using the melt-spinning technique. H...

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  • Effect of polypyrrole on the electrical, dielectric and mechanical properties of waterborne epoxy coatingsEffect of polypyrrole on the electrical, dielectric and mechanical properties of waterborne epoxy coatings

    Abstract. In this context, dissipative composite based on waterborne epoxy system and polypyrrole (PPy) was investigated. PPy was synthesized by chemical oxidation polymerization. Its morphology and chemical structure were confirmed by using field emission scanning electron microscopy (FESEM) and Fourier transform infrared spectroscopy (FTIR). Th...

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  • Effect of graphene-gold nanocomposites on the photocatalytic activity of TiO2Effect of graphene-gold nanocomposites on the photocatalytic activity of TiO2

    Abstract. The synthesis of graphene (Gr) - gold (Au) nanoparticle (NP) composite was achieved using continuous ultraviolet wave exposure. The functional groups were investigated with FTIR spectra. From the Raman spectra, D-band and G-band of Gr were identified. As a result, the uniform deposition of nanometer-sized Au NPs on the Gr sheets was obs...

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  • Effect of annealing temperature on the Li+ ionic conductivity of La0.67−xLi3xTiO3Effect of annealing temperature on the Li+ ionic conductivity of La0.67−xLi3xTiO3

    Abstract. Perovskite La0.67−xLi3xTiO3 with x = 0.10, 0.11, 0.12 and 0.13 were firstly annealed at 800 oC then treated by reactive milling, followed by post-annealing at temperatures from 1100 to 1200oC. The crystalline structure of grain and grain-boundary were characterized by XRD and SEM. The impedance measurements showed that nanocrystalline ...

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  • Dynamics of electroweak phase transition in the 3-3-1-1 modelDynamics of electroweak phase transition in the 3-3-1-1 model

    Abstract. The bubble nucleation in the framework of 3-3-1-1 model is studied. Previous studies show that first order electroweak phase transition occurs in two periods. In this paper we evaluate the bubble nucleation temperature throughout the parameter space. Using the stringent condition for bubble nucleation formation we find that in the firs...

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  • Nghiên cứu hấp phụ phenol đỏ bằng carbon nano ống đa tườngNghiên cứu hấp phụ phenol đỏ bằng carbon nano ống đa tường

    TÓM TẮT Vật liệu nano được biết đến từ những năm cuối thể kỷ 20 và sự ra đời của loại vật liệu này đã đánh dấu một bước tiến lớn trong lĩnh vực nghiên cứu khoa học ứng dụng vật liệu. Tuy nhiên, cho đến hiện nay, vật liệu này vẫn là đối tượng được tập trung nghiên cứu. Các nghiên cứu chủ yếu hướng đến phương pháp tổng hợp, theo đó phương pháp tổ...

    pdf10 trang | Chia sẻ: thanhle95 | Ngày: 17/07/2021 | Lượt xem: 0 | Lượt tải: 0