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Journal Articles

Materials and Life Science Experimental Facility (MLF) at the Japan Proton Accelerator Research Complex, 2; Neutron scattering instruments

Nakajima, Kenji; Kawakita, Yukinobu; Ito, Shinichi*; Abe, Jun*; Aizawa, Kazuya; Aoki, Hiroyuki; Endo, Hitoshi*; Fujita, Masaki*; Funakoshi, Kenichi*; Gong, W.*; et al.

Quantum Beam Science (Internet), 1(3), p.9_1 - 9_59, 2017/12

The neutron instruments suite, installed at the spallation neutron source of the Materials and Life Science Experimental Facility (MLF) at the Japan Proton Accelerator Research Complex (J-PARC), is reviewed. MLF has 23 neutron beam ports and 21 instruments are in operation for user programs or are under commissioning. A unique and challenging instrumental suite in MLF has been realized via combination of a high-performance neutron source, optimized for neutron scattering, and unique instruments using cutting-edge technologies. All instruments are/will serve in world-leading investigations in a broad range of fields, from fundamental physics to industrial applications. In this review, overviews, characteristic features, and typical applications of the individual instruments are mentioned.

Journal Articles

Degradation manner of polymer grafts chemically attached on thermally stable polymer films; Swelling-induced detachment of hydrophilic grafts from hydrophobic polymer substrates in aqueous media

Enomoto, Kazuyuki*; Takahashi, Shuichi*; Iwase, Takanori*; Yamashita, Takashi*; Maekawa, Yasunari

Journal of Materials Chemistry, 21(25), p.9343 - 9349, 2011/07

 Times Cited Count:35 Percentile:72.72(Chemistry, Physical)

The degradation manner of graft-type polymer electrolyte membranes consisting of hydrophilic poly(styrenesulfonic acid) (PSSA) graft polymers (grafts) and thermally and mechanically stable hydrophobic polymer substrates was examined in hot water. Severe weight loss was observed in PSSA-grafted cPTFE and ETFE films but not in a PSSA-grafted PEEK film. The decomposed extracts in water were characterized as PSSA during the whole course of degradation, clearly showing that the PSSA grafts detached from the fluorinated substrates without decomposition or scission of graft polymer chains. This is quite a new degradation manner for graft-type polymer electrolyte membranes; namely, hydrophilic PSSA grafts detach from hydrophobic polymer substrates due to swelling-induced stress at the interfacial boundary in the grafted films.

Journal Articles

Measurement of self-diffusion coefficients in Li ionic conductors by using the short-lived radiotracer of $$^8$$Li

Jeong, S.-C.*; Katayama, Ichiro*; Kawakami, Hirokane*; Watanabe, Yutaka*; Ishiyama, Hironobu*; Imai, Nobuaki*; Hirayama, Yoshikazu*; Miyatake, Hiroari; Sataka, Masao; Okayasu, Satoru; et al.

Journal of Phase Equilibria and Diffusion, 26(5), p.472 - 476, 2005/09

Authors developed a radiotracer method for diffusion studies in solids. The experimental test was performed by the measurement of the diffusion coefficients of Li in a sample of the compound $$beta$$LiAl using an $$alpha$$-emitting radiotracer of $$^8$$Li(T$$_{1/2}$$ = 0.84 s). It was found that the time-dependent yields of the alpha particles from the diffusing 8Li that was initially implanted in the sample could be used as a measure of the diffusivity of the tracer in a nondestructive way. The method was applied to measure the self-diffusion coefficients of Li in $$beta$$LiGa, and for investigating how the Li diffusion in the Li ionic conductors is affected by the concentration of atomic defects.

Journal Articles

Measurement of diffusion coefficients in solids by the short-lived radioactive beam of $$^{8}$$Li

Jeong, S.-C.*; Katayama, Ichiro*; Kawakami, Hirokane*; Watanabe, Yutaka*; Ishiyama, Hironobu*; Miyatake, Hiroari*; Sataka, Masao; Okayasu, Satoru; Sugai, Hiroyuki; Ichikawa, Shinichi; et al.

Nuclear Instruments and Methods in Physics Research B, 230(1-4), p.596 - 600, 2005/04

 Times Cited Count:6 Percentile:46.35(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Critical current density of YBa$$_{2}$$Cu$$_{3}$$O$$_{y}$$ containing inclined columnar defects

Ishikawa, Norito; Sueyoshi, Tetsuro*; Iwase, Akihiro; Chimi, Yasuhiro; Fujiyoshi, Takanori*; Miyahara, K.*; Kisu, T.*

Physica C, 357-360(Part.1), p.505 - 508, 2001/09

no abstracts in English

Oral presentation

Degradation mechanism of graft-type polymer electrolyte membranes for fuel cells

Enomoto, Kazuyuki; Takahashi, Shuichi*; Iwase, Takanori*; Yamashita, Takashi*; Maekawa, Yasunari

no journal, , 

Degradation mechanism of the graft-type polymer electrolyte membranes prepared by radiation techniques in the hot water have been studied in detail using UV-vis, GPC, NMR, and wide-angle X-ray scattering. The hydrothermal stability is found to be strongly related to the phase separation of the ion-containing hydrophilic grafts and hydrophobic polymers.

Oral presentation

Degradation behavior of graft-type polymer electrolyte membranes consisting of fluorinated base polymers

Maekawa, Yasunari; Takahashi, Shuichi; Iwase, Takanori*; Enomoto, Kazuyuki; Yamashita, Takashi*

no journal, , 

Degradation mechanism of the graft-type polymer electrolyte membranes prepared by radiation techniques in the hot water have been studied in detail using UV-vis, GPC, NMR, and wide-angle X-ray scattering. The hydrothermal stability is found to be strongly related to the phase separation of the ion-containing hydrophilic grafts and hydrophobic polymers.

Oral presentation

Phase separation of graft-type polymer electrolyte membranes and swelling and detachment behavior of the grafts

Maekawa, Yasunari; Enomoto, Kazuyuki; Takahashi, Shuichi*; Iwase, Takanori*; Yamashita, Takashi*; Iwase, Hiroki*; Koizumi, Satoshi

no journal, , 

Detachment of sulfonated grafts in graft-type polymer electrolyte membranes (PEM) were observed in hot water. The detachment is assisted by the interface stress between swelling of the hydrophilic grafts and hydrophobic polymer substrates. The grafted PEM with a clear phase separation structure, observed by small angle neutron scattering (SANS), are subjected to fast detachment of the grafts.

Oral presentation

Characterization of polymer grafts chemically attached on thermally stable polymer films; Detachment of hydrophilic grafts from hydrophobic polymer substrates in aqueous media

Enomoto, Kazuyuki; Takahashi, Shuichi*; Iwase, Takanori*; Yamashita, Takashi*; Iwase, Hiroki*; Koizumi, Satoshi; Maekawa, Yasunari

no journal, , 

The degradation behavior of graft-type polymer electrolyte membranes consisting of hydrophilic sulfo-containing graft polymers (grafts) in hydrophobic polymer substrates are examined; We employed poly(styrenesulfonic acid) (PSSA) as a hydrophilic grafts and crosslinked poly(tetrafluoroethylene) (cPTFE), poly(ethylene-co-tetrafluoroethylene) (ETFE), and poly(vinylidene fluoride) (PVDF) as a hydrophobic plastic substrate. PSSA-grafted cPTFE, ETFE, and PVDF films are degraded with more than 30 % weight loss in 85 $$^{circ}$$C for 500 hours. The good agreement between losses of sulfo groups and film weights indicated that only PSSA grafts degraded from cPTFE, ETFE, and PVDF substrates. Using UV, NMR, and GPC, the decomposed extracts in water are confirmed to be PSSA with the same molecular weights. Furthermore, since the elemental analysis of the extracts did not have fluorine atoms, the grafts in all the PSSA-grafted films detach from the fluorinated substrates without decomposition. This is quite new degradation mode of graft-type polymer electrolyte membranes. By taking advantages of the interface abruption of swelled grafts, the chemically and thermally stable grafts attached onto the plastic films can be isolated and analyzed without special treatments.

Oral presentation

Change in various properties induced by swift heavy ion irradiation in CeO$$_{2}$$

Kishino, Takanori*; Shimizu, Hirotaka*; Hori, Fuminobu*; Iwase, Akihiro*; Ishikawa, Norito; Okamoto, Yoshihiro; Saito, Yuichi

no journal, , 

In the present experiment, to obtain the fundamental knowledge of radiation effects on CeO$$_{2}$$, CeO$$_{2}$$ pellets and films were irradiated with various energetic ions. To evaluate the effect of high energy ion irradiation on CeO$$_{2}$$, we have used a con-ventional X-ray diffraction (XRD), Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy, X-ray Photoelectron Spectroscopy (XPS), and SQUID magne-tometer. In this symposium, we discuss the effects of ion irradiation on CeO$$_{2}$$.

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