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Journal Articles

Mechanical properties of cubic (U,Zr)O$$_{2}$$

Kitagaki, Toru; Hoshino, Takanori; Yano, Kimihiko; Okamura, Nobuo; Ohara, Hiroshi*; Fukasawa, Tetsuo*; Koizumi, Kenji

Journal of Nuclear Engineering and Radiation Science, 4(3), p.031011_1 - 031011_7, 2018/07

Journal Articles

Hierarchically self-organized dissipative structures of filler particles in poly(styrene-$$ran$$-butadiene) rubbers

Yamaguchi, Daisuke; Yuasa, Takeshi*; Sone, Takuo*; Tominaga, Tetsuo*; Noda, Yohei*; Koizumi, Satoshi*; Hashimoto, Takeji*

Macromolecules, 50(19), p.7739 - 7759, 2017/10

 Times Cited Count:7 Percentile:38.76(Polymer Science)

We elucidated the spatial distribution of filler particles in cross-linked poly(styrene-$$ran$$-butadiene) rubbers (SBR) developed under a typical fillers/rubbers compounding process as one of dissipative structures formed under a stress field imposed on the given system. The dispersion state of the fillers in SBR was clarified on the basis of hierarchical structures consisting of five structure levels. More specifically, it has the following characteristics depending on the specific interactions: Small, compact clusters build up compact mass-fractal structures, while large, loose clusters build up open mass-fractal structures.

Journal Articles

Journal Articles

Mechanical properties of fuel debris for defueling toward decommissioning

Hoshino, Takanori; Kitagaki, Toru; Yano, Kimihiko; Okamura, Nobuo; Ohara, Hiroshi*; Fukasawa, Tetsuo*; Koizumi, Kenji

Proceedings of 23rd International Conference on Nuclear Engineering (ICONE-23) (DVD-ROM), 6 Pages, 2015/05

Journal Articles

Hierarchical structure in microbial cellulose; What happens during the drying process

Zhao, Y.; Koizumi, Satoshi; Yamaguchi, Daisuke; Kondo, Tetsuo*

European Physical Journal E, 37(12), p.129_1 - 129_12, 2014/12

 Times Cited Count:7 Percentile:36.01(Chemistry, Physical)

Journal Articles

Bacterium organizes hierarchical amorphous structure in microbial cellulose

Koizumi, Satoshi; Zhao, Y.; Tomita, Yoko*; Kondo, Tetsuo*; Iwase, Hiroki; Yamaguchi, Daisuke; Hashimoto, Takeji

European Physical Journal E, 26(1-2), p.137 - 142, 2008/05

 Times Cited Count:42 Percentile:82.79(Chemistry, Physical)

no abstracts in English

Journal Articles

Photoionization of Ne$$^{3+}$$ ions in the region of the 1${it s}$ $$rightarrow$$ 2${it p}$ autoionizing resonance

Oura, Masaki*; Yamaoka, Hitoshi*; Kawatsura, Kiyoshi*; Kimata, Junichi*; Hayaishi, T.*; Takahashi, Takehisa*; Koizumi, Tetsuo*; Sekioka, T.*; Terasawa, Michitaka*; Ito, Yo*; et al.

Physical Review A, 63(1), p.014704_1 - 014704_4, 2001/01

 Times Cited Count:15 Percentile:61.17(Optics)

no abstracts in English

Oral presentation

Hierarchical structure of microbial cellulose determined by focusing ultra-small angle neutron scattering

Koizumi, Satoshi; Kondo, Tetsuo*; Tomita, Yoko*; Iwase, Hiroki; Yamaguchi, Daisuke; Hashimoto, Takeji

no journal, , 

no abstracts in English

Oral presentation

Combined SANS, WANS and weighing studies of microbial cellulose; Elucidation of hierarchical structures in drying process

Zhao, Y.; Koizumi, Satoshi; Hashimoto, Takeji; Tomita, Yoko*; Kondo, Tetsuo*

no journal, , 

Oral presentation

Mechanism of water absorption in microbial cellulose; Hierarchical amorphous structure and capillarity

Koizumi, Satoshi; Tomita, Yoko*; Zhao, Y.; Iwase, Hiroki*; Yamaguchi, Daisuke; Kondo, Tetsuo*; Hashimoto, Takeji; Masui, Tomomi

no journal, , 

no abstracts in English

Oral presentation

Combined SANS, WANS, and weighing studies of microbial cellulose in drying process

Zhao, Y.; Koizumi, Satoshi; Hashimoto, Takeji; Tomita, Yoko*; Kondo, Tetsuo*

no journal, , 

Oral presentation

Analysis of dispersion of fillers in functionalized SSBR/filler composites by using neutron and X-ray scattering

Yamaguchi, Daisuke; Koizumi, Satoshi; Yuasa, Takeshi*; Sone, Takuo*; Tominaga, Tetsuo*

no journal, , 

A comprehensive small-angle scattering analyses on the dispersion state of fillers in rubber/filler compounds was investigated. Recently, an effective size reduction of dispersible units of the fillers and consequential improvement of the property of the hysteresis loss was attained in the end functionalized S-SBR/filler system. To get more insight into the hierarchical structure of those systems, a complementary use of different contrasts between neutron and synchrotron X-ray was attempted in this study. Each different profile of neutron and X-ray scattering suggested two dominant structures within the system: one is the higher-order aggregations of the filler particles and the other is originated from vulcanized SBR matrices.

Oral presentation

Analysis of dispersion state of fillers in functionalized S-SBR/filler composites

Yamaguchi, Daisuke; Koizumi, Satoshi; Yuasa, Takeshi*; Sone, Takuo*; Tominaga, Tetsuo*

no journal, , 

A comprehensive ultrasmall- and small-angle scattering analysis on the dispersion state of fillers in rubber/filler compounds is investigated. Recently, an effective size reduction of dispersible units of the fillers and consequential improvement of the property of the hysteresis loss was attained in the end functionalized S-SBR/filler system. Here S-SBR denotes solution polymerization styrene-butadiene rubber. To get more insight into the hierarchical structure of those systems, a complementary use of different contrasts between neutron and synchrotron X-ray was attempted. The different q-dependence of the scattering profiles taken by neutron and by X-ray suggested that two dominant structures exist in the system: one is the higher-order aggregations of the fillers and the other is the density fluctuations due to the vulcanization. By modification of the chain end of SBR with a functional group having the affinity for the fillers, the scattering signals originated from the vulcanization of SBR hardly changed, whereas those originated from the aggregation of the fillers distinctly changed. This tendency strongly supports the above scenario for the improvement of mechanical property of rubber/filler compounds.

Oral presentation

Hierarchical structure in multi-component rubber/filler system

Yamaguchi, Daisuke; Koizumi, Satoshi; Yuasa, Takeshi*; Sone, Takuo*; Tominaga, Tetsuo*

no journal, , 

Small-angle scattering analyses of rubber/filler compounds is investigated. An effective size reduction of dispersible units of the fillers and consequential improvement of the mechanical property was attained in the end functionalized S-SBR/filler system. To get more insight into the hierarchical structure of those systems, a complementary use of neutron and synchrotron X-ray was attempted. The obtained scattering profiles suggested that two dominant structures exist in the system: one is the higher-order aggregations of the fillers and the other is the density fluctuations due to the vulcanization. By modification of the SBR, the scattering signals originated from the vulcanization of SBR hardly changed, whereas those originated from the aggregation of the fillers changed. This tendency strongly supports the above scenario for the improvement of mechanical property of rubber/filler compounds.

Oral presentation

Study of silica particle dispersion in styrene-btadiene rubber by spin contrast variation technique

Noda, Yohei; Yamaguchi, Daisuke; Hashimoto, Takeji; Koizumi, Satoshi; Tominaga, Tetsuo*; Sone, Takuo*; Yuasa, Takeshi*

no journal, , 

For investigating the dispersion state of silica particles in styrene-butadiene rubber composites, we measured its small angle neutron scattering with polarizing its proton spins. By proton spin polarization, we can control the coherent scattering length for neutron beam. As a result, we succeeded in abstracting the scattering profile only from the silica particles.

Oral presentation

Spin contrast variation study of silica-filled styrene-butadiene rubber

Noda, Yohei; Yamaguchi, Daisuke; Hashimoto, Takeji; Koizumi, Satoshi; Tominaga, Tetsuo*; Sone, Takuo*; Yuasa, Takeshi*

no journal, , 

For silica-filled styrene-butdiene rubber samples, we measured small angle neutron scattering with the proton spins in the samples being aligned to one direction. As a result, we precisely determined the silica particles' dispersion by the abstracted partial scattering function.

Oral presentation

Spin contrast variation technique for a multi-component system; A Study of silica-filled styrene-butadiene rubber

Noda, Yohei; Yamaguchi, Daisuke; Hashimoto, Takeji; Koizumi, Satoshi; Yuasa, Takeshi*; Tominaga, Tetsuo*; Sone, Takuo*

no journal, , 

For silica-filled styrene-butadiene rubber, we measured small angle neutron scattering with the proton spins in the sample being aligned to one direction. We succeeded in determination of the silica particles' dispersion by analyzing the abstracted partial scattering function of the silica particles.

Oral presentation

Spin contrast variation study of fuel-efficient tire rubber

Noda, Yohei; Yamaguchi, Daisuke; Hashimoto, Takeji; Shamoto, Shinichi; Koizumi, Satoshi; Yuasa, Takeshi*; Tominaga, Tetsuo*; Sone, Takuo*

no journal, , 

We have developed a spin contrast variation technique. Our target is hydrogeneous solid materials such as polymer and rubber, which are not easy to be deuterated and can absorb a vapor of a stable free radical, TEMPO, which serves as an electron spin source necessary for high proton spin polarization (P) through dynamic nuclear polarization. By use of this vapor permeation technique, we succeeded in polarizing silica-filled SBR rubber, which is a material for fuel-efficient tire. From the polarized SANS profiles obtained with various P values, we succeeded in separating the partial scattering function of silica, which is considered to be a key factor for the fuel-efficiency.

Oral presentation

Measurement of absolute detection efficiency using a high sensitivity micro-channel plate

Matoba, Shiro; Moriya, Sosuke*; Takahashi, Karin*; Ishikawa, Manabu*; Koizumi, Tetsuo*; Shiromaru, Haruo*

no journal, , 

no abstracts in English

Oral presentation

Small angle neutron scattering study with contrast variation by dynamic nuclear polarization; Application to silica-filled styrene-butadiene rubber

Noda, Yohei; Yamaguchi, Daisuke; Hashimoto, Takeji; Shamoto, Shinichi; Koizumi, Satoshi; Tominaga, Tetsuo*; Sone, Takuo*; Yuasa, Takeshi*

no journal, , 

We will report the result of the small angle neutron scattering study of silica-filled SBR rubber with contrast variation by dynamic nuclear polarization. As a result of this study, we succeeded in precise evaluation of silica particles' dispersion state in composite rubber materials, which has been known to have strong effect on the fuel-efficiency or tire rubber.

31 (Records 1-20 displayed on this page)