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Fabrication and Structural Characterization of Module-Assembled Amphiphilic Conetwork Gels
Hiroi, Takashi,Kondo, Shinji,Sakai, Takamasa,Gilbert, Elliot Paul,Han, Young-Soo,Kim, Tae-Hwan,Shibayama, Mitsuhiro American Chemical Society 2016 Macromolecules Vol.49 No.13
<P>Structural analysis of inhomogeneity-free poly(ethylene glycol)-poly(dimethylsiloxane) (PEG PDMS) amphiphilic conetwork gels has been performed by the complementary use of small-angle X-ray and neutron scattering. Because of the hydrophobicity of PDMS units, the PEG-PDMS gels exhibit a microphase-separated structure in water. Depending on the volume fraction of; PDMS, the microphase-separated structure varies from core-shell to lamellar. The obtained X-ray and neutron scattering profiles are reproduced well using a core-shell model together with a Percus-Yevick structure factor when the volume fraction of PDMS is small. The domain size is much larger than the size of individual PEG and PDMS unit, and this is explained using the theory of block copolymers. Reflecting the homogeneous dispersion conditions in the as-prepared state, scattering peaks are observed even at a very low PDMS volume fraction (0.2%). When the volume fraction of PDMS is large, the microphase-separated structure is lamellar and is demonstrated to be kinetically controlled by nonequilibrium and topological effects.</P>
Antiferromagnetic Transition in Ru2CrSi in Magnetic Fields
Masahiko Hiroi,Kaori Uchida,Iduru Shigeta,Masakazu Ito,Keiichi Koyama,Shojiro Kimura,Kazuo Watanabe 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
In the Heusler compound Ru2CrSi, an antiferromagnetic transition at TN =14 K was revealed byspecific heat and magnetization measurements. In this study the electrical resistivity is measured inmagnetic fields up to 14.5 T, and the antiferromagnetic transition in magnetic fields is investigated. In the temperature dependence of the resistivity at zero field, a clear dip at 15 K and a humpwith a maximum at 9 K are observed. This dip is considered to be due to the antiferromagnetictransition. With increasing magnetic field, the magnitude of the resistivity slightly increases aroundTN; i.e., a positive magnetoresistance is observed. The temperature dependence of the resistivityis hardly affected by increasing the magnetic field. The transition temperature decreases only by 0.3 K even with applying 14.5 T. These results demonstrate that the antiferromagnetic state inRu2CrSi is unusually unaffected by a strong magnetic field.
Nishi, Kengo,Hiroi, Takashi,Hashimoto, Kei,Fujii, Kenta,Han, Young-Soo,Kim, Tae-Hwan,Katsumoto, Yukiteru,Shibayama, Mitsuhiro American Chemical Society 2013 Macromolecules Vol.46 No.15
<P>The tacticity effect on phase separation process of poly(<I>N</I>-isopropylacrylamide) (PNiPAM) aqueous solutions was investigated by dynamic light scattering (DLS) and small angle neutron scattering (SANS) measurements. SANS measurement revealed that hydrophobicity of PNiPAM consisting of meso- and racemo-isomers increased with increasing the meso-content. This result is in accordance with the result of the previous experimental and simulation study on NiPAM dimers (DNiPAM) and trimers (TNiPAM) [Katsumoto<x>, </x>Y<x>.</x>; <etal></etal> J. Phys. Chem. B<x> </x>2010<x>, </x>114<x>, </x>13312−<lpage>13318</lpage>, and Autieri<x>, </x>E.; <etal></etal> J. Phys. Chem. B<x> </x>2011<x>, </x>115<x>, </x>5827<x>–</x><lpage>5839</lpage>]; i.e., meso-diad is more hydrophobic than racemo-diad. In addition, a series of scattering experiments revealed that the ratio of meso-diad does not affect the static structure or the shrinking behavior of a single chain, but strongly affects the aggregation behavior. The PNiPAMs with low meso-content suddenly associate around the phase separation temperature, while that of the high meso-content gradually aggregate with increasing temperature. We propose that phase transition behavior of PNiPAM aqueous solutions can be controlled by changing the stereoregularity of the polymer chain.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/mamobx/2013/mamobx.2013.46.issue-15/ma401349v/production/images/medium/ma-2013-01349v_0012.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ma401349v'>ACS Electronic Supporting Info</A></P>
Yoshimasu, Takashi,Hiroi, Akihisa,Ohtani, Toshio,Uede, Koji,Furukawa, Fukumi Korean Society of Photoscience 2002 Journal of Photosciences Vol.9 No.2
Fluorouracil (FU) is well known to induce discoid lupus-like eruption at the sun exposure sites in Japan. It means the associations of UVB with drug induced DLE. It is still obscure which cytokines are involved in the development of DLE. To address the issue, we established a murine model of FU and UVB-induced discoid lupus and could show the Th1 dominant cytokine profiles in DLE model of TCR $\alpha$ chain KO mice treated with FU and UVB.
Observation of disossiative recombination in the hydrogen sheet plasma
akira Tonegawa,Hiroie MATSUMOTO,Hiroyuki YAZAWA,Kazutaka KAWAMURA,Masataka ONO,Takehisa SHIBUYA 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
The experimental observation of dissociative recombination in Molecular Assisted Recombination (MAR) for hydrogen detached plasma has been studied in the linear divertor plasma simulator, TPD-SheetIV. Measurements of the relative concentrations of atomic and molecular ions (nH+, n+ H2, and n+ H3), electron density (ne), electron temperature (Te), and heat load to the target plate (Q) were carried out in hydrogen detached plasma with hydrogen gas puff at varying discharge current. An “omegatron” mass analyzer, situated behind a small hole of the endplate, is used for analyzing ion species. It is shown from these results that the dominant molecular process is a dissociative recombination process via H+ 2 , H+ 3 in the plasma over the range of low plasma density (<5 × 1018 m.3) and low hydrogen pressure (<4 mTorr). In contrast, molecular assisted dissociation (MAD) always dominates over the MAR in the high density plasma (>5 × 1018 m.3).
Low Dose Ultraviolet Al (340-400 nm) Phototherapy for Erythrodermic Cutaneous T-cell Lymphoma
Uede, Koji,Hiroi, Akihisa,Nakamura, Tomoyuki,Kishi, Tomoo,Yamamoto, Yuki,Furukawa, Fukumi Korean Society of Photoscience 2002 Journal of Photosciences Vol.9 No.2
Three patients suffering from widespread erythrodermic cutaneous T-cell lymphoma were treated with low-dose UVAI phototherapy with a single dose of 20 - 30J/$cm^2$, resulting in cumulative doses of 520 - 1890 J/$cm^2$. Two patients showed complete responses, while other had a partial improvement.
Structural Analysis of Lipophilic Polyelectrolyte Solutions and Gels in Low-Polar Solvents
Nishi, Kengo,Tochioka, Saki,Hiroi, Takashi,Yamada, Taihei,Kokado, Kenta,Kim, Tae-Hwan,Gilbert, Elliot Paul,Sada, Kazuki,Shibayama, Mitsuhiro American Chemical Society 2015 Macromolecules Vol.48 No.11
<P>Lipophilic polyelectrolyte gels capable of large swelling in low-polar solvents (3 ≤ ε ≤ 10) were developed by Ono et al. (Nature Mater.<x> </x>2007), where ε is the dielectric constant. These gels were prepared by introducing tetraphenylborate as a lipophilic anion (tetrakis(3,5-bis(trifluoromethyl)phenyl)borate; TFPB<SUP>–</SUP>) and tetraalkylammonium with long alkyl chains as a lipophilic cation (tetra(<I>n</I>-butyl)ammonium; TBA<SUP>+</SUP>) into a poly(octadecyl acrylate) (pODA) backbone chain. Here, we investigated the structure of the lipophilic polyelectrolyte gels and corresponding polymer solutions in CH<SUB>2</SUB>Cl<SUB>2</SUB> with small-angle neutron scattering (SANS) and dynamic light scattering (DLS). From SANS, it was revealed that individual pODA chain is regarded as a rod with the cross-section radius of 15 Å and the length of ca. 160 Å and is little changed by introduction of charges or cross-linking. In addition to this, it was revealed from SANS measurements that the second virial coefficient of pODA in CH<SUB>2</SUB>Cl<SUB>2</SUB> was positive. In combination with DLS measurements, we observed several characteristic features similar to polyelectrolyte aqueous systems such as (i) the clear appearance of slow diffusional motion in polymer solutions, (ii) an increase of diffusion coefficient in gels, and (iii) an increase of osmotic modulus in solutions and gels when ionic groups are incorporated in pODA. These experimental findings clearly show that [TBA<SUP>+</SUP>][TFPB<SUP>–</SUP>] dissociates enough and pODA, accompanying these ionic groups, acts as a polyelectrolyte even in a low-polar solvent such as CH<SUB>2</SUB>Cl<SUB>2</SUB> (ε = 8.9). It is concluded that the good compatibility of pODA with CH<SUB>2</SUB>Cl<SUB>2</SUB> and the introduction of dissociable ionic groups into pODA result in high-swelling capability of the lipophilic polyelectrolyte gels.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/mamobx/2015/mamobx.2015.48.issue-11/acs.macromol.5b00753/production/images/medium/ma-2015-00753f_0012.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ma5b00753'>ACS Electronic Supporting Info</A></P>
Kang, S,Takeda, M,Hiroi, Z,Kim, G W,Lee, C G,Koo, B H Institute of Physics [etc.] 2010 Journal of Physics. D, Applied Physics Vol.43 No.41
<P>The electromagnetic properties and microstructures of a Cu<SUB>75</SUB>–Fe<SUB>5</SUB>–Ni<SUB>20</SUB> alloy have been investigated on isothermal annealing at 1073 K, using a superconducting quantum interference device magnetometer, quantum design, physical property measurement system and transmission electron microscopy. Nanoscale magnetic particles were formed randomly in the Cu-rich matrix after receiving a short annealing due to the phase decomposition in the alloy. With increasing isothermal annealing time, however, rod-type precipitates aligned along the 〈1 0 0〉 directions were observed in the matrix, on isothermal annealing at 1073 K. Although the size of the precipitates became larger (from ∼10 nm to >300 nm) after further annealing, no significant change (less than 2%) was detected in the MR value. The largest MR value (MR ∼16% at <I>H</I> = 7 T and <I>T</I> = 10 K) was attained, in particular, for the as-quenched specimen. This study revealed that several significant influences were introduced into the magnetic and magnetoresistive properties during the phase decomposition process in the Cu–Fe–Ni alloy.</P>
Development of Wheeled Inverted Pendulum Type Personal Mobility with Pedal
Seonghee Jeong,Yuji Masuda,Yutaka Hiroi,Takayuki Takahashi,Osamu Matsumoto 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
In this paper, the mechanism and basic driving function of a wheeled inverted pendulum-type personal mobility with a pedal (Wi-PMP) are described. The mobility consists of a wheeled inverted pendulum-type mobile platform and a leg rowing mechanism, and thus it can be driven by a rider’s leg rowing motion. Moreover, to retain the merits of pivot turning of a parallel two-wheeled mobility, a differential gear box and a one-way clutch are installed between the pedal and the wheel shafts. It is designed such that a rider can ground his feet while sitting on the saddle. In addition, the Wi-PMP is compact and light-weight, and thus it can be driven and parked in a narrow space. Through experiments using three types of driving mode(motor driving, pedal driving, and assist driving), it was confirmed that mobility can realize all driving modes and pivot turning while keeping the feet of the rider on the pedals.