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T. Ogawa,K. Seto,D. Hasegawa,H. T. Yang,H. Kura,M. Doi,M. Takahashi 한국자기학회 2011 Journal of Magnetics Vol.16 No.3
In order to obtain mono-dispersed Fe NPs with high saturation magnetization, quantitative analysis method to investigate the growth dynamics of the Fe NPs synthesized by a conventional thermal decomposition method has been developed. As a result, fast nucleation process promotes formation of ~4 ㎚ of initial nucleus with a non-equilibrium phase, resulting in low saturation magnetization. And slow particle growth with atomic-scaled surface precipitation mode (< 100 atoms/(minㆍ㎚²)) can form the growth layer on the surface of initial nucleus with high saturation magnetization (~190 emu/gFe) as an equilibrium a phase of Fe. Therefore, higher stabilization of small initial nucleus generated just after the injection of Fe(CO)? should be one of the key issues to achieve much higher Ms of Fe NPs.
Hasegawa, S.,Shinozaki, K.,Honma, T.,Dimitrov, V.,Kim, H.G.,Komatsu, T. North-Holland 2016 Journal of non-crystalline solids Vol.452 No.-
<P>Glasses based on the system of Y2O3-BaO-Nb2O5-B2O3, corresponding to the pseudo-binary 64Ba(1 - x)Y(2x/3)Nb(2)O(6)-B2O3 with x = 0.1-0.5, were prepared, and their thermal properties, electronic polarizabilities, optical basicities, and crystallization behavior were clarified. The glasses showed the glass transition temperature of 602-610 degrees C, crystallization peak temperature of 686-676 degrees C, and refractive index of 1.967-2.007. All the glasses showed the bulk crystallization behavior, providing Ba1 - xY2x/3Nb2O6 nanocrystals with a tetragonal tungsten bronze structure. It was found from high resolution transmission electron microscope observations that the morphology of Ba1 - xY2x/3Nb2O6 nanocrystals is ellipsoidal and their average particle size is in the range of 20-40 nm. The glass-ceramics with Ba1 - xY2x/3Nb2O6 nanocrystals showed high dielectric constants (frequency: 1 kHz) of similar to 90 at room temperature and a ferroelectric nature. Highly oriented Ba1 - xY2x/3Nb2O6 crystal lines were patterned by laser (continuous wave Yb:YVO4 fiber laser with a wavelength of 1080 nm) irradiation with the condition of a laser power of 1.9 W and a laser scanning speed of 4 pm/s and with the laser focal position of 20 mu m beneath from the surface in 2NiO-1.1Y(2)O(3)-29.8BaO-33.1Nb(2)O(5)-36B(2)O(3) glass. (C) 2016 Elsevier B.V. All rights reserved.</P>
Lightcurve survey of V-type asteroids in the inner asteroid belt
Hasegawa, S.,Miyasaka, S.,Mito, H.,Sarugaku, Y.,Ozawa, T.,Kuroda, D.,Nishihara, S.,Harada, A.,Yoshida, M.,Yanagisawa, K.,Shimizu, Y.,Nagayama, S.,Toda, H.,Okita, K.,Kawai, N.,Mori, M.,Sekiguchi, T.,Is Astronomical Society of Japan 2014 Publications of the Astronomical Society of Japan Vol.66 No.3
Fundamental study on gene transfer utilizing magnetic force and jet injector
Hasegawa, T.,Nakagam, H.,Akiyama, Y.,Nishijima, S. The Korea Institute of Applied Superconductivity a 2017 한국초전도저온공학회논문지 Vol.19 No.1
Recently, DNA vaccination is attracting attentions as a new therapeutic method for lifestyle diseases and autoimmune diseases. However, its clinical applications are limited because a safe and efficient gene transfer method has not been established yet. In this study, a new method of gene transfer was proposed which utilizes the jet injection and the magnetic transfection. The jet injection is a method to inject medical liquid by momentary high pressure without needle. The injected liquid diffuses in the bio tissue and the endocytosis is considered to be improved by the diffusion. The magnetic transfection is a method to deliver the conjugates of plasmid DNA and magnetic particles to the desired site by external magnetic field. It is expected that jet injection of the conjugates causes slight membrane disruptions and the traction of the conjugates by magnetic field induces the efficient gene transfer. In conclusion, the possibility of improvement of the gene expression by the combination of jet injection and magnetic transfection was confirmed.
Investigation of anti-wear additives for synthetic esters
T. HASEGAWA,I. MINAMI,Y. KIDERA,K. HIRAO,M. MEMITA 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.2002 No.10
Antiwear (AW) properties of phoshphonic acid derivatives for trimethylolpropane (TMP) esters were investigated under boundary conditions. AW effect of dialkyl phosphonates depends on polarity of base fluid. They provide good AW performance in less polar TMP esters, whereas their AW effect is not sufficient in polar TMP esters. Amine sails of phosphonic acid were developed as new AW additive system for TMP esters. They provide excellent AW performance even in polar TMP esters.