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Ferromagnetic Order in Rapidly Cooled Nd-Fe-Co-Al Alloy Ribbons
Phan, T. L.,Zhang, Y. D.,Dan, N. H.,Thang, D. D.,Thanh, T. D.,Zhang, P.,Yu, S. C. IEEE 2013 IEEE transactions on magnetics Vol.49 No.7
<P>We have studied the magnetic properties of Nd<SUB>45</SUB>Fe<SUB>30</SUB>Co<SUB>15</SUB>Al<SUB>10</SUB> alloy ribbons with various thicknesses of about 120 (N<SUB>1</SUB>) and 50 μm (N<SUB>2</SUB>) prepared by melt-spinning. Structural analyses based on an X-ray diffractometer and a high-resolution transmission electron microscope revealed an existence of nanocrystals with sizes of 10 ~ 20 nm surrounded by an amorphous host matrix. With decreasing ribbon thickness and nanocrystalline size, magnetic studies upon a vibrating sample magnetometer indicated the decrease of the Curie temperature (T<SUB>C</SUB>), coercive force (H<SUB>c</SUB>), and magnetic entropy change (ΔS<SUB>m</SUB>). In the ferromagnetic region, however, magnetization values determined for N<SUB>2</SUB> are greater than those determined for N<SUB>1</SUB>. These results are related to the differences in the critical exponents of N<SUB>1</SUB> (β=0.418 and γ=1.173), and N<SUB>2</SUB> (β=0.512 and γ=1.077), which are characteristic for the ferromagnetic nature existing in the alloy ribbons with different thicknesses.</P>
Balamurugan, J.,Thanh, T.D.,Heo, S.B.,Kim, N.H.,Lee, J.H. Pergamon Press ; Elsevier Science Ltd 2015 Carbon Vol.94 No.-
A facile and cost-effective one-pot solvothermal method has been successfully developed to synthesize an N-doped graphene (NG) and copper-nickel oxide (CuNiO) composite. The novel NG/CuNiO composite is proposed to be used as an electrode material for supercapacitors and non-enzymatic glucose sensors. Transmission electron microscopy images indicate the formation of CuNiO nanoparticles with an average diameter of approximately 5.6nm, with good dispersion on the NG sheets. The composite exhibited an excellent specific capacity of ~892Fg<SUP>-1</SUP> (current density of 1Ag<SUP>-1</SUP>) and high long-cycle stability with a 98.5% retention in specific capacitance after 5000 cycles at a current density of 5Ag<SUP>-1</SUP>. This superior electrochemical performance is attributed to high charge mobility, the flexibility of the N-doped graphene structure, and the synergetic effect between CuNiO nanoparticles and NG sheets. Further, the proposed sensor exhibited rapid response (<10s), high sensitivity (7.49μAmM<SUP>-1</SUP>cm<SUP>-2</SUP>), a wide detection range (0.2μM-0.3mM), good reproducibility, long-term stability, and a low detection limit 50nM (S/N=3). The NG/CuNiO composite electrode can be used for high performance supercapacitor and non-enzymatic glucose sensor applications.
Balamurugan, J.,Thanh, T.,Kim, N.,Lee, J. Royal Society of Chemistry 2016 Journal of Materials Chemistry A Vol.4 No.24
<P>A novel three-dimensional (3D) hierarchical hybrid architecture, consisting of in situ designed cobalt-encapsulated nitrogen doped carbon nanotubes (Co-NCNTs) grown on nitrogen doped graphene (NG), is fabricated for asymmetric supercapacitors. When evaluated as an electrode material for supercapacitors, the 3D hybrid has an excellent energy density, outstanding rate capability and long-cycle life compared with commercial electrode materials. The decent electrochemical performance is comparable to most of the earlier reported results and the synergistic effect boosts the pseudocapacitive performance. The constructed hybrid exhibits excellent energy storage characteristics, which result in an ultra-high specific capacitance of 2568 F g(-1) at 2 A g(-1) and excellent rate capability with an extraordinary capacitance of 1594 F g(-1) at 100 A g(-1) (96.64% capacitance retention after 20 000 cycles). The improvement in the outstanding electrochemical performance can be attributed to the unique morphology, extraordinary porosity, excellent conductive networks, and the intense networking of Co-NCNT and NG nanosheets in the 3D hybrid. An asymmetric supercapacitor fabricated using the 3D NG/Co-NCNT hybrid as the positive electrode and NG as the negative electrode demonstrates exceptional performance for practical energy storage devices. The assembled asymmetric supercapacitors provide a greater energy density (similar to 88.44 W h kg(-1)), an ultra-high power density (similar to 17 991 W kg(-1) at 56.97 W h kg(-1)), and outstanding cyclability (similar to 10 000 times).</P>
Li, C.,Balamurugan, J.,Thanh, T.,Kim, N.,Lee, J. Royal Society of Chemistry 2017 Journal of Materials Chemistry A Vol.5 No.1
<P>A unique morphology, high specific surface area, extraordinary porosity, and excellent conductive networks are typical favorable properties of pseudocapacitors; however, fully comprehending and interpreting this substantive topic still remains a great challenge. Herein, we present a new strategy for the direct growth of a cobalt monoxide@manganese oxide core-shell nanostructure on 3D Ni foam (CoO@MnO2/Ni foam). This is accomplished by simple, scalable, in situ fabrication methods to produce a material that can be employed as an advanced electrode material for high-energy solid state asymmetric supercapacitors (ASCs). The cost-effective, binder-free 3D CoO@MnO2 core-shell nanostructure delivers excellent electrochemical properties with an ultra-high specific capacitance (1835 F g(-1) at a current density of 1 A g(-1)), tremendous rate capabilities with an extraordinary capacitance of 1198 F g(-1) at a current density of 20 A g(-1), and outstanding stability (97.7% capacitance retention after 10 000 cycles). ASCs with a maximum potential window of 1.8 V are fabricated by using a 3D CoO@MnO2 core-shell nanohybrid as the positive electrode and N-doped graphene (NG) as the negative electrode in order to validate the outstanding performance for practical energy storage devices. Impressively, the ASCs delivered a high specific capacitance (191 F g(-1) at 1 A g(-1)), excellent energy density (similar to 85.9 W h kg(-1)), an ultra-high power density (similar to 16 769 W kg(-1) at 51.7 W h kg(-1)), and remarkable cycle stability (86.8% capacitance retention after 10 000 cycles). These findings provide a new method to design 3D CoO@MnO2 core-shell nanostructures that are cost-effective and binder-free electrode materials for the development of high-performance energy storage devices.</P>
La Duy Tân,Phùng Thị Thanh Xuân,Trần Minh Quý 한국베트남학회 2023 한국베트남학회 학술대회 Vol.2023 No.10
Today, when reiniscing the achievement of Korea’s economic development over the past decades, it is easy to find positive recognitions of President Park Jung-hee's national management throughout the 60s and 70s. Similarly, when assessing the success of Korean populace culture worldwide, very few would expect that the forerunner of the appealing entertainment industry was once restricted for the protection of political stability. The policy of banning popular music was influenced by the policy of suppressing Korean culture during the Japanese colonial period. Songs that are banned due to its negative effects are called keumjikok (prohibited song), which restricts the singer's artistic activities consequently. This paper is written to study mainly on the process of forming and implementing the policy related to keumjikok. Thereby, the authors attempted to historically present the societal and political features of Korea during President Park Jung-hee period.
Effect of Particle Size on Some Properties of High-Tc Bi-Based Compounds
N. K. Man,T. D. Hien,N. D. Thanh,N. T. Mua,C. D. Hien 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.5
Samples with a norminal composition of Bi1:6Pb0:4Sr2Ca2Cu3Oy were prepared by using the sol- gel method. The growth of high-Tc superconducting phases (Bi,Pb)2Sr2Can..1CunO2n+4δ (n = 1, 2 and 3) and their particle size were observed for increasing sintering temperature by using x-ray powder diraction and scanning electron microscopy. The superconductivity of the samples was obtained by using resistivity and ac-susceptibility measurements. The results showed the evident dependence of the superconducting transition characteristics on the particle size over a wide range from sub-micron to some tens of micrometers. The mixing on an atomic scale obtained by using the sol-gel method and the doped elements like Pb and Ag are the key technological elements that govern the growth rate of the high-Tc superconducting phases and their particle sizes. Samples with a norminal composition of Bi1:6Pb0:4Sr2Ca2Cu3Oy were prepared by using the sol- gel method. The growth of high-Tc superconducting phases (Bi,Pb)2Sr2Can..1CunO2n+4δ (n = 1, 2 and 3) and their particle size were observed for increasing sintering temperature by using x-ray powder diraction and scanning electron microscopy. The superconductivity of the samples was obtained by using resistivity and ac-susceptibility measurements. The results showed the evident dependence of the superconducting transition characteristics on the particle size over a wide range from sub-micron to some tens of micrometers. The mixing on an atomic scale obtained by using the sol-gel method and the doped elements like Pb and Ag are the key technological elements that govern the growth rate of the high-Tc superconducting phases and their particle sizes.
Van Do, N.,Khue, P.D.,Thanh, K.T.,Hien, N.T.,Kim, G.,Kim, K.,Shin, S.G.,Kye, Y.U.,Cho, M.H. Pergamon 2017 Radiation physics and chemistry Vol.139 No.-
<P>We measured the thermal neutron cross-section (sigma(0)) and resonance integral (I-0) of the Sm-152(n,gamma)Sm-153 reaction relative to that of the Au-197(n,gamma)Au-198 reaction. Sm and Au foils with and without a cadmium cover of 0.5 mm were irradiated with moderated pulsed neutrons produced from the electron linac. The induced activities of the reaction products were determined via high energy resolution HPGe detector. The present results: sigma(0),(sm) = 212 +/- 8 b and sigma(0),(sm) = 3.02 +/- 0.19 kb are consistent with most of the existing reference data.</P>