Refine your search:     
Report No.
 - 
Search Results: Records 1-11 displayed on this page of 11
  • 1

Presentation/Publication Type

Initialising ...

Refine

Journal/Book Title

Initialising ...

Meeting title

Initialising ...

First Author

Initialising ...

Keyword

Initialising ...

Language

Initialising ...

Publication Year

Initialising ...

Held year of conference

Initialising ...

Save select records

Journal Articles

Fluoropolymer-based nanostructured membranes created by swift-heavy-ion irradiation and their energy and environmental applications

Yamaki, Tetsuya*; Nuryanthi, N.*; Kitamura, Akane; Koshikawa, Hiroshi*; Sawada, Shinichi*; Voss, K.-O.*; Severin, D.*; Tautmann, C.*

Nuclear Instruments and Methods in Physics Research B, 435, p.162 - 168, 2018/11

 Times Cited Count:1 Percentile:72.34(Instruments & Instrumentation)

We used individual single-ion tracks in fluoropolymers with diameters of tens to hundreds of nanometers; chemical etching and ion-track grafting enabled us to develop ion-track and proton-conductive membranes, respectively. In the ion-track membranes of PVDF, strongly-LET-dependent etching was found, so the pore shape as well as the size was exclusively controlled by the track structures. We performed the ion-track grafting of styrene into ETFE to develop nanostructure-controlled proton exchange membranes (PEMs) for applications in PEM fuel cells. Our ion beam technology to develop fluoropolymer-based nanostructures has the potential to apply in the field of filtration processes and fuel cell devices. This would make it possible to provide new microfiltration technology for water treatment, sterilization, petroleum refining and dairy processing.

Journal Articles

Preparation of nano-structure controlled ion-exchange membranes by ion beams and their application to seawater concentration

Yamaki, Tetsuya*; Goto, Mitsuaki*; Sawada, Shinichi*; Koshikawa, Hiroshi*; Kitamura, Akane; Higa, Mitsuru*

QST-M-8; QST Takasaki Annual Report 2016, P. 35, 2018/03

We prepared ion exchange membranes by a heavy-ion-track grafting method, and then used them for seawater concentration process. Both the water uptake and resistance were lower for our ion-track grafted membranes than for the conventional $$gamma$$-ray-grafted membranes. The results would be because local and high-density energy deposition due to the ion beam enabled us to control the membrane structure in a nanometer scale. We demonstrate our membranes are suitable for this application.

Journal Articles

Microstructure and hardness of HIP-bonded regions in F82H blanket structures

Furuya, Kazuyuki; Wakai, Eiichi; Ando, Masami; Sawai, Tomotsugu; Nakamura, Kazuyuki; Takeuchi, Hiroshi; Iwabuchi, Akira*

Journal of Nuclear Materials, 307-311(Part1), p.289 - 292, 2002/12

 Times Cited Count:6 Percentile:57.73

no abstracts in English

JAEA Reports

Extended abstracts of the 13th JAERI Workshop on High-Tc Superconductors

Okayasu, Satoru; Hojo, Kiichi; Ishida, Takekazu*

JAERI-Review 2002-018, 118 Pages, 2002/09

JAERI-Review-2002-018.pdf:10.38MB

no abstracts in English

JAEA Reports

Extended abstracts of the 12th JAERI Workshop on High-Tc Superconductors

Hojo, Kiichi; Okayasu, Satoru; Sasase, Masato; Ishida, Takekazu*

JAERI-Review 2001-008, 150 Pages, 2001/03

JAERI-Review-2001-008.pdf:20.63MB

no abstracts in English

Journal Articles

Radiation protection in accelerator facilities

Tanaka, Ryuichi; Yotsumoto, Keiichi; Watanabe, Hiromasa

Radioisotopes, 45(3), p.213 - 220, 1996/03

no abstracts in English

Oral presentation

Fabrication of a new $$^{68}$$Ge-$$^{68}$$Ga source with high production efficiency by an improved metal galium target

Maekawa, Masaki; Zhou, K.*; Fukaya, Yuki; Zhang, H.; Li, H.; Kawasuso, Atsuo

no journal, , 

no abstracts in English

Oral presentation

LET dependence on the track etch rate in ion irradiated polyimide films

Koshikawa, Hiroshi; Asano, Masaharu*; Yamaki, Tetsuya; Maekawa, Yasunari

no journal, , 

We investigated track etch rates (V$$_{T}$$) of polyimide irradiated with different ions by a conductivity technique and their LET dependence. Both of 12 and 25 $$mu$$m thick films were irradiated with 450 MeV $$^{129}$$Xe, 250 MeV $$^{40}$$Ar and 75 MeV $$^{20}$$Ne and then were etched with a sodium hypochlorite solution. The conductometric analysis involves recording electric conductance of the etchant across the film during the etching time. When the etched pores from both sides of the film made contact with each other, the conductance suddenly increased to find the breakthrough time (T$$_{B}$$). A V$$_{T}$$ value was obtained by dividing the half thickness of the films by T$$_{B}$$. The Xe ions with the highest LET of 12 MeV/$$mu$$m gave ca. 20 times higher V$$_{T}$$ than the Ne ions. The change in V$$_{T}$$ for the different beams is ascribed to an LET effect by considering that the bombardment with high-LET ions produces more severe molecular damage in each track.

Oral presentation

Development of AMOC system for measuring transient defects under irradiation

Ueda, Daisuke*; Konishi, Suzuka*; Minagawa, Hideaki*; Hirade, Tetsuya; Tsuchida, Hidetsugu*

no journal, , 

Damaged conditions under irradiation such as ion beams irradiation are transient and unstable. Understanding of this transient damage state is important to clarify the process from damage generation to stabilization. We are developing Age-MOmentum Correlation (AMOC) measurement system by $$beta$$$$^{+}$$-$$gamma$$ coincident measurement to investigate the triplet positronium (o-Ps) reactions as a probe of reactive species. From the correlation between "positron annihilation time" and "momentum of electron / positron at pair annihilation" obtained by AMOC measurement, it is possible to investigate the process of o-Ps reactions. We report on AMOC measurement system newly constructed by digital method.

Oral presentation

Development of $$beta$$$$^{+}$$-$$gamma$$ based AMOC measurement system

Konishi, Suzuka*; Ueda, Daisuke*; Xu, Q.*; Hirade, Tetsuya; Tsuchida, Hidetsugu*

no journal, , 

In order to elucidate the transient damage state by ion beam etc., positron annihilation lifetime - momentum correlation (Age-MOmentum Correlation: AMOC) apparatus by $$beta$$$$^{+}$$-$$gamma$$ simultaneous measurement is newly constructed by the digital method. In this study, we investigated the effect of $$gamma$$-irradiation of polystyrene using the AMOC apparatus. As a result, we obtained that the S parameter near 1 ns decreases corresponding to the increase of damage amount.

Oral presentation

AMOC measurement for fused quartz during ion irradiation

Konishi, Suzuka*; Minagawa, Hideaki*; Majima, Takuya*; Imai, Makoto*; Saito, Manabu*; Hirade, Tetsuya; Tsuchida, Hidetsugu*

no journal, , 

To clarify the damage behavior under ion irradiation in quartz glass, Age-Momentum Correlation measurement that is a coincidence measurement of positron annihilation lifetime and annihilation gamma ray Doppler broadening was performed under 2 MeV proton irradiation. From the change in momentum distribution of electrons involved in positron annihilation in voids of the quartz glass, flux dependence of damage behavior could be detected.

11 (Records 1-11 displayed on this page)
  • 1