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Synthesis of MnO2/Graphene Nanocomposites using Plasma Electrolysis Method for Photocatalytic Degradation of Methyl Orange Dye in Water
VNU Journal of Science: Mathematics - Physics - Tập 38 Số 2 - 2022
Pham Quoc Trieu, Dang Van Thanh, Nguyen Thanh Trung, Nguyen Long Tuyen
This report presented an effective way to synthesize MnO2/graphene nanocomposites using the plasma electrolysis method for photocatalytic degradation of methyl orange dye in water. The morphology, structure, and chemical composition of MnO2/graphene nanocomposites materials were investigated through scanning electron microscopy (SEM), Raman spectra, and Fourier-transform infrared (FTIR) spectrosco...... hiện toàn bộ
Influence of Spin Fluctuation on the Magnetic Properties of EuO Ultra-thin Film
Communications in Physics - Tập 23 Số 3 - 2013
Pham Huong Thao, Bach Thanh Cong
The Gaussian spin fluctuation theory is applied to study magnetic properties (Curie temperature, magnetization) of EuO  ultra-thin films within nearest neighbor and next nearest neighbor exchange approximation. The dependence of Curie temperature on the thickness of the free EuO ultrathin film is calculated and compared with the results of the other mean field method- constant coupling approximati...... hiện toàn bộ
#exchange interaction #magnetic properties #ultra-thin films
Phân Tích Độ Dẫn Điện Thừa Trong Hệ Thống Bi-Pb-Sr-Ca-Cu-O Được Nung Ở Nhiệt Độ Khác Nhau Dịch bởi AI
VNU Journal of Science: Mathematics - Physics - Tập 37 Số 4 - 2021
Tran Hai Duc
Bài báo này nghiên cứu ảnh hưởng của nhiệt độ nung đến cấu trúc tinh thể, nhiệt độ tới hạn (Tc) và độ dẫn điện thừa của hệ thống Bi-Pb-Sr-Ca-Cu-O (BPSCCO). Các mẫu BPSCCO khối được chế tạo bằng phương pháp phản ứng trạng thái rắn. Bốn nhiệt độ khác nhau 835 °C, 840 °C, 845 °C, và 850 °C được áp dụng để nung bốn mẫu khác nhau. Cấu trúc tinh thể của các mẫu đã được điều tra thông qua các phép đo nhi...... hiện toàn bộ
Size Effect in Grand-canonical Monte-Carlo Simulation of Solutions of Electrolyte
VNU Journal of Science: Mathematics - Physics - Tập 35 Số 2 - 2019
Nguyen Viet Duc
Abstract: A Grand-canonical Monte-Carlo simulation method is investigated. Due to charge neutrality requirement of electrolyte solutions, ions must be added to or removed from the system in groups. It is then implemented to simulate solution of 1:1, 2:1 and 2:2 salts at different concentrations using the primitive ion model. We investigate how the finite size of the simulation box can influence st...... hiện toàn bộ
No Small Hairs in Anisotropic Power-law Gauss-Bonnet Inflation
Communications in Physics - Tập 29 Số 2 - 2019
Tuan Quoc Do
We will examine whether anisotropic hairs exist in a string-inspired scalar-Gauss-Bonnet gravity model with the absence of potential of scalar field during the inflationary phase. As a result, we are able to obtain the Bianchi type I power-law solution to this model under the assumption that the scalar field acts as the phantom field, whose kinetic is negative definite. However, the obtained aniso...... hiện toàn bộ
#Gauss-Bonnet gravity #Inflation #Bianchi type I metric #Cosmic no-hair conjecture
Ovalbumin Based Microlasers
VNU Journal of Science: Mathematics - Physics - Tập 36 Số 2 - 2020
Hanh Hong Mai
In this work, biomaterial based microlasers were successfully fabricated by a cost effective, simple and environmental friendly fabrication method. The as-fabricated microlasers were made of biocompatible material including ovalbumin doped Rhodamine B at low weight percentage. The lasers had solid-state spheres with various diameters ranging from 20 µm to over 100 µm. It was shown that inside the ...... hiện toàn bộ
Some Properties of TiO2/Au Nanocomposite Thin Films Produced by Spincoating Method for Application in Plasmonic Solar Cells
VNU Journal of Science: Mathematics - Physics - Tập 31 Số 2 - 2015
Nguyen Duy Thien, Nguyen Tien Thanh, Le Van Vu, Nguyen Tien Thuy, Dao Khac An
The TiO2/Au nanocomposite thin films play a very important role in the plasmonic solar cell. In such as composite systems, the localized surface plasmon resonance (LSPR) of embedded metal nanoparticles determines the light absorption enhancement of the semiconductive part (TiO2); hence, enhances the efficiency of the plasmatic solar cell. The characterizations of the TiO2/Au nanocomposite thin fil...... hiện toàn bộ
Optical Properties of Zn-based Semiconductor Nanoparticles and Application in Two-barcode Encryption
VNU Journal of Science: Mathematics - Physics - Tập 31 Số 4 - 2015
Luu Manh Quynh, Hoang Van Huy, Nguyen Hoang Nam
Mn-doped ZnS (ZnS/Mn) nanoparticles synthesized by sono-chemical co-precipitation are combined with ZnO nanoparticles synthesized by sol-gel method for application in two-barcode encryption. Nanoparticles are mixed together in different mass proportions of ZnO: ZnS/Mn respectively being 5: 1, 10: 1, 15: 1, 20: 1, 25: 1.30 : 1 and 35: 1, before being pressed in 1 cm diameter, 1 mm thick KBr pellets...... hiện toàn bộ
Explicit Phase Space Transformations and Their Application in Noncommutative Quantum Mechanics
VNU Journal of Science: Mathematics - Physics - Tập 31 Số 2 - 2015
Nguyen Quang Hung, Do Quoc Tuan
We study a problem of transformations mapping noncommutative phase spaces into commutative ones. We find a simple way to obtain explicit formulas of such transformations in 3D and indicate matrix equations for numerical computation in higher dimensions. Then we use these formulas to calculate the energy levels of the hydrogen-like atom with six noncommutative parameters. We also find and prove new...... hiện toàn bộ
Soil Classification and Seismic Site Response Analysis for Some Areas in Hanoi City
VNU Journal of Science: Earth and Environmental Sciences - Tập 34 Số 1 - 2018
Giang Kien Trung
Abstract: Along with the development of urban and modern life, Hanoi Capital has been constructing more and more sky buildings, big bridges and huge underground constructions. According to historical studies, Hanoi is a region located on the weak soil ground which has a rather thick sedimentary layer, complicated geology structure and shallow ground water aged in the Holocene and Pleistocene. Hano...... hiện toàn bộ
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