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Ohtomo, M.,Yamauchi, Y.,Sun, X.,Kuzubov, A.,Mikhaleva, N.,Avramov, P.,Entani, S.,Matsumoto, Y.,Naramoto, H.,Sakai, S. Royal Society of Chemistry 2017 Nanoscale Vol.9 No.6
<P>We report the structural analysis and spin-dependent band structure of hydrogenated boron nitride adsorbed on Ni(111). The atomic displacement studied by using the normal incidence X-ray standing wave (NIXSW) technique supports the H-B(fcc):N(top) model, in which hydrogen atoms are site-selectively chemisorbed on boron atoms and N atoms remain on top of Ni atoms. The distance between the Ni plane and nitrogen plane did not change after hydrogenation, which implies that the interaction between Ni and N is 3d-pi orbital mixing (donation and back-donation) even after hydrogenation of boron. The remaining pi* peaks in near-edge X-ray absorption fine structure (NEXAFS) spectra are a manifestation of the rehybridization of sp(2) into sp(3) states, which is consistent with the N-B-N bonding angle derived from NIXSW measurement. The SPMDS measurement revealed the spin asymmetry appearing on hydrogenated h-BN, which was originated from a p related orbital with back donation from the Ni 3d state. Even though the atomic displacement is reproduced by the density functional theory (DFT) calculation with the H-B(fcc):N(top) model, the experimental spin-dependent band structure was not reproduced by DFT possibly due to the self-interaction error (SIE). These results reinforce the site-selective hydrogenation of boron and pave the way for efficient design of BN nanomaterials for hydrogen storage.</P>
High Pressure Synthesis of Mg0.90Al0.08Ni0.94V0.08H1.6
Sakai, T .,Chen, J .,Kitamura, N .,Takeshita, H . T .,Kuriyama, N . 대한금속재료학회(대한금속학회) 2000 METALS AND MATERIALS International Vol.6 No.6
The effect of high-pressure (6 gigapascal) and heating (600℃) the hydrogen source of LiAlH₄ on the structural and hydrogenation properties of 0.9MgH₂+0.1Al+0.9Ni+0.1VH_(0.9) was investigated. After recovery to ambient conditions, the sample was analyzed using X-ray diffractioin, differential scanning calorimetry, thermogravimetry and differential thermal analyses. The results reveal that a nominal hydride phase with the composition of Mg_(0.90)Al_(0.08)Ni_(0.94)V_(0.08)H_(1.6) can be obtained, in which a maximum H₂-uptake can reach 1.9 wt.%, with hydride decomposition occurring between 160℃ and 250℃.
Magnetic Properties of Fe-doped NiO Nanoparticles
A. Kurokawa,N. Sakai, L. Zhu,H. Takeuchi,S. Yano,T. Yanoh,K. Onuma,T. Kondo,K. Miike,T. Miyasaka,Y. Ichiyanagi 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
Ni1−xFexO (x = 0, 0.05, 0.1) nanoparticles with several nanometers encapsulated with amorphousSiO2 were prepared by our novel preparation method. A NiO single phase structure was confirmedusing the X-ray diffraction measurements. It is considered that Ni ions are replaced by Fe ionsbecause it is observed that the lattice constant decreases. The temperature dependence behaviorof the magnetization revealed that the blocking temperature, TB, shifted from 17 to 57 K as theamount of Fe ions increased, and that below TB, ferromagnetic behaviors were exhibited. Thecoercive force, HC, increased from 0.8 to 1.5 kOe as the amount of Fe ions increased.
Comparison of Effects of Ultraviolet and $^{60}$ Co Gamma Ray Irradiation on Nylon 6 Mono-filaments
Ohtsuka, Mika,Suzuki, Yoshino,Sakai, Tetsuya,Netravali, Anil N. The Korean Fiber Society 2004 Fibers and polymers Vol.5 No.3
The effect of UV and $^60{Co}$ gamma radiations on the physical and mechanical properties of nylon 6 mono-filaments with different draw ratios has been studied. Specimens were exposed to either up to 25 Mrad of gamma or up to 168 hrs of intense UV irradiation. The results show that nylon mono-filaments exposed to gamma rays, with much higher quantum energy than UV, undergo a larger extent of molecular chain scission. Higher irradiation dose also results in the production of insoluble, macroscopic three-dimensional cross-linked network structure. The amorphous regions with a lower density of cohesive energy (lower molecular orientation) show a higher extent of cross linking reaction whereas amorphous regions with a higher density of cohesive energy (higher orientation) show higher extent of chain scission reaction, irrespective of UV ray or gamma ray irradiation.