• Effect of Substituted Concentration on Structure and Magnetic Properties of Y3Fe5-XInxO12 - Vu Thi Hoai HuongEffect of Substituted Concentration on Structure and Magnetic Properties of Y3Fe5-XInxO12 - Vu Thi Hoai Huong

    In summary, the present study has shown that Y3Fe5-xInxO12 (x = 0 ÷ 0.7) powders with size between 50 – 100 nm were fabricated using the sol-gel method. The single phase structural was observed for x as large as 0.6. At x = 0.7, a small amount of orthoferrite YFeO3 appears (~ 2%). The value of lattice constant increases with increasing x. Our re...

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  • Synthesis and Characterization of NiFe2O4/ZnO core-Shell Nanocomposites - Dinh Khac HuySynthesis and Characterization of NiFe2O4/ZnO core-Shell Nanocomposites - Dinh Khac Huy

    In summary, we have successfully synthesized NiFe2O4/ZnO core/shell nanoparticles by using a combination of hydrothermal and co-precipitation methods. In the sample, NiFe2O4 and ZnO phases were crystallized completely. Grains were observed to be a set of these phases. Magnetization of the core was enhanced significantly in the case that the NiFe...

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  • Molecular Dynamic Simulation of Large Model of Silica Liquid - Nguyen Thi Thanh HaMolecular Dynamic Simulation of Large Model of Silica Liquid - Nguyen Thi Thanh Ha

    In this work, microstructure and dynamic properties of large model of silica liquid at pressures ranging from 0 to 20 GPa were investigated in detail. Results reveal that the structure of SiO2 liquid consists of structural units SiOx (x = 4, 5, 6) and OSiy (y = 2,3). At ambient, the number of SiO4 and OSi2 unit is domain. Upon compression, the f...

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  • Effective Excess Charge Density in Water Saturated Porous Media - Luong Duy ThanhEffective Excess Charge Density in Water Saturated Porous Media - Luong Duy Thanh

    In this work, a model for the effective excess charge in a capillary QˆvR as well as in porous media REV Qˆv is developed for arbitrary pore scales. The results of QˆvR and QˆvREV as a function of the capillary radius, electrolyte concentration and permeability predicted from the obtained model are then compared with those from [19]. The compar...

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  • Raman Spectroscopy of CaCu3Ti4O12 Ceramics Revisited - Hoang Nam NhatRaman Spectroscopy of CaCu3Ti4O12 Ceramics Revisited - Hoang Nam Nhat

    We have successfully prepared the CaCu3Ti4O12 materials by a ceramic technology and investigated its electric and optical properties. The sample exhibited a high dielectric constant (~52,000) at room temperature and showed almost the same first-order phonon bands as were observed in the previous studies. The results showed that the compound was ...

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  • Prediction of cross second virial coefficients for dimer H2-O2 from ab initio calculations of intermolecular potentialsPrediction of cross second virial coefficients for dimer H2-O2 from ab initio calculations of intermolecular potentials

    Here the Mi denote molar masses of the pure components, Mij an “interaction molar mass”, and c is a constant (21.8 K g/mol). It turns out that the adjustable parameters aij and dij are very close to zero for a large number of chemical compounds. We have set these two correlation parameters to zero for the hydrogen-oxygen interaction and used the...

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  • The Studies of Energy Transfer between Sm3+ ions in Lead Sodium Telluroborate Glasses Using Inokuti-Hirayama ModelThe Studies of Energy Transfer between Sm3+ ions in Lead Sodium Telluroborate Glasses Using Inokuti-Hirayama Model

    The optical spectra of Sm3+ -doped lead sodium telluroborate glasses have been investigated. The luminescence shows the self-quenching happening after concentration of about 0.75 mol%. This phenomenon is due to the energy transfer process between the pairs of Sm3+ ions. This process leads to the reduction of the lifetime. The non-exponential dec...

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  • Electrochemical DNA sensor for Herpes virus detection - Phuong Dinh TamElectrochemical DNA sensor for Herpes virus detection - Phuong Dinh Tam

    This paper reports the potential ability of DNA sensor HSV-1 virus detection. The optimal temperature range found for such kind of DNA was from 60 to 650C. The DNA sensor can determine the DNA target of HSV-1 in the sample at the concentration as low as 0.5 nM. Such concentration is very important in enzyme based biosensors application for d...

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  • The kumada-Corriu cross-coupling reaction in micro reactor: advantages over conventional batch reactorThe kumada-Corriu cross-coupling reaction in micro reactor: advantages over conventional batch reactor

    In summary, the Kumada-Corriu reaction using the polymer-supported nickel catalyst at room temperature was readily carried out in a continuous micro flow reactor. Reasonable conversions could be achieved in a matter of minutes, compared to conversions obtained after 24 h in a conventional batch reaction, albeit on a much smaller scale. Compa...

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  • Effect of Temperature on Cu2ZnSnS4 Nanomaterial Synthesized by Hydrothermal Approach - Pham Thi HongEffect of Temperature on Cu2ZnSnS4 Nanomaterial Synthesized by Hydrothermal Approach - Pham Thi Hong

    Fig. 4 shows the plot of (h)2 vs. h of CZTS nanoparticles prepared at 240 oC. The band gap of the nanoproduct was estimated by extrapolating the linear part of the plot to the horizontal axis. The result shows that the band gap of CZTS is 1.52 eV, which is consistent with bandgap reported for CZTS prepared by solution methods. This value is a...

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