Experimental analysis on dynamics of liquid molecules adjacent to particles in nanofluids

Hashimoto, Shunsuke*; Nakajima, Kenji; Kikuchi, Tatsuya*; Kamazawa, Kazuya*; Shibata, Kaoru; Yamada, Takeshi*

Journal of Molecular Liquids, 342, p.117580_1 - 117580_8, 2021/11

https://doi.org/10.1016/j.molliq.2021.117580

Quasi-elastic neutron scattering (QENS) and pulsed-field-gradient nuclear magnetic resonance (PFGNMR) analyses of a nanofluid composed of silicon dioxide (SiO) nanoparticles and a base fluid of ethylene glycol aqueous solution were performed. The aim was to elucidate the mechanism increase in the thermal conductivity of the nanofluid above its theoretical value. The obtained experimental results indicate that SiO particles may decrease the self-diffusion coefficient of the liquid molecules in the ethylene glycol aqueous solution because of their highly restricted motion around these nanoparticles. At a constant temperature, the thermal conductivity increases as the self-diffusion coefficient of the liquid molecules decreases in the SiO nanofluids.

X-ray diffraction experiments under pulsed magnetic fields above 30T

Inami, Toshiya; Owada, Kenji; Matsuda, Yasuhiro*; Ueda, Yuji*; Nojiri, Hiroyuki*; Murakami, Yoichi*; Arima, Takahisa*; Ota, Hiroto*; Zhang, W.*; Yoshimura, Kazuyoshi*

Nuclear Instruments and Methods in Physics Research B, 238(1-4), p.233 - 236, 2005/08

https://doi.org/10.1016/j.nimb.2005.06.053

Usually, X-ray diffraction experiments under strong magnetic fields are carried out using a superconducting magnet and the maximum field is limited up to 15T. In order to overcome this limitation, we have constructed an X-ray diffraction system combined with a pulsed magnet. The structural phase transition of PrCaMnO around 8 T and the valence transition of YbInCu around 26 T are shown as a demonstration.

Application of a portable pulsed magnet to synchrotron radiation experiments

Matsuda, Yasuhiro*; Ueda, Yuji*; Nojiri, Hiroyuki*; Takahashi, Toshiharu*; Inami, Toshiya; Owada, Kenji; Murakami, Yoichi; Arima, Takahisa*

Physica B; Condensed Matter, 346-347, p.519 - 523, 2004/04

https://doi.org/10.1016/j.physb.2004.01.139

A very small capacitor bank and miniature pulsed magnets have been developed to perform high-field synchrotron radiation experiments. A 20T pulsed field can be generated using an energy of 1kJ with typical pulse duration about 1ms. Electron spin resonance experiments in millimeter wave range and high-field X-ray diffraction experiments have been done successfully.

Present state and problems of radiological protection monitoring for high energy electron accelerator facilities in SPring-8

Miyamoto, Yukihiro; ; Harada, Yasunori

JAERI-Tech 98-039, 44 Pages, 1998/09

JAERI-Tech-98-039.pdf:2.21MB

no abstracts in English

Development of pulse magnet system in J-PARC MLF

Watanabe, Masao; Nojiri, Hiroyuki*

no journal, , 

Recently, neutron scattering experiments have been rapidly progressed under high magnetic field. In the J-PARC, proto-type compact pulse magnet system with the power supply, the coil and the sample stick has been developed. Basic specifications of the power supply are as follows; maximum charged voltage with capacitor is 2 kV, maximum current is 8 kA, repetition rate is a pulse per several minutes and pulse duration is several msec. Maximum magnetic field in the coil is more than 30 Tesla. The sample stick is designed for Orange-Cryostat. In this presentation, the details of the power supply system, test results of the coil and assembly of the sample stick are shown.

Development of pulsed magnet system in J-PARC MLF

Watanabe, Masao; Nojiri, Hiroyuki*; Ito, Shinichi*; Kawamura, Seiko; Kihara, Takumi*; Masuda, Takatsugu*; Sahara, Takuro*; Soda, Minoru*; Takahashi, Ryuta

no journal, , 

Recently, neutron and radiation beam scattering experiments have been rapidly progressed under high magnetic field more than a few tens Tesla. In the J-PARC MLF, proto-type compact pulse magnet system has been developed for the user's request. The pulsed magnet system consist of (1) a capacitor bank power supply, (2) a small solenoid coil and (3) a cryostat-insert. The capacitor bank power supply is movable using casters in order to be used for each beam-line. Superconducting DC magnet up to 17 T has already developed for neutron scattering experiments, so we made the coil which generate higher magnetic fields up to 30 T. We developed a cryostat-insert for Orange-cryostat which has often been used in neutron experiments. In this presentation, we report measurement results of characteristics of the pulsed magnet system in high resolution chopper spectrometer (HRC).