Article
Engineering, Electrical & Electronic
J. Garankin, A. Plukis, J. Grineviciute
Summary: This work presents the application of polyethylene naphthalate (PEN) plastic polymer as a material for detecting and analyzing ionizing radiation particles. The study focuses on using PEN detectors to discriminate different types of ionizing radiation particles. Calibrations were carried out using sealed alpha, gamma, and beta sources to find the optimal parameters for particle discrimination. The quality of discrimination was evaluated using the figure of merit (FOM) factor, which considers the normal distribution of pulses caused by ionizing radiation particles.
IEEE TRANSACTIONS ON NUCLEAR SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Li-Jun Quan, Zhen-Guo Liu, Qiu-Yu Zhang, Zhong-Ming Li, Yan-Hui Chen
Summary: In this paper, PETN composites with high oxygen barrier properties are prepared by introducing trace amounts of graphene oxide (GO) during the in situ polymerization process. The interfacial interaction between GO and PETN matrix is enhanced, leading to highly improved oxygen barrier performance of the PETN nanocomposite films.
MACROMOLECULAR MATERIALS AND ENGINEERING
(2022)
Article
Polymer Science
Zhiqiang Chen, Chenhui Cui, Chenyu Jin, Xiuzhao Li, Yifan Zhou, Yizhe Shao, Li Ma, Yanfeng Zhang, Tiejun Wang
Summary: A reactive blending strategy was proposed to develop a thermoplastic-thermoset blend with enhanced compatibility based on dynamic covalent chemistry. Polybutylene terephthalate (PBT) and polymerized epoxy vitrimer were melt blended and the bond exchange facilitated the grafting of PBT and epoxy vitrimer chains, resulting in improved interfacial compatibility and thermal stability. The obtained blend achieved a balance between the strength and stretchability of PBT and epoxy vitrimer, leading to enhanced toughness.
MACROMOLECULAR RAPID COMMUNICATIONS
(2023)
Article
Polymer Science
Derek E. Huang, Anthony P. Kotula, Chad R. Snyder, Kalman B. Migler
Summary: Motivated by the issue of brittle mechanical behavior in recycled blends of HDPE and iPP, this study investigates the composition dependence of their crystallization kinetics using optical microscopy, rheo-Raman, and DSC. The results show that the crystallization behavior of iPP varies with blend composition, with three distinct two-phase morphologies observed. The crystallization temperature of iPP decreases sharply with increasing HDPE composition in the HDPE droplet regime, while it is delayed but shows little change in the onset temperature in cocontinuous morphologies. In the iPP droplet regime, the two components crystallize nearly concurrently. Rheological measurements support these findings. DSC analysis suggests that the enthalpy of crystallization of the blends is less than the weighted values of the individual components.
Article
Chemistry, Multidisciplinary
Maria Gimeno-Perez, James D. Finnigan, Coro Echeverria, Simon J. Charnock, Aurelio Hidalgo, Diana M. Mate
Summary: In the past two decades, various PET-degrading enzymes have been discovered to address the environmental concern of PET accumulation. However, there is a lack of high-throughput screening methods for PET-hydrolyzing activity without the use of surrogate substrates. This study presents a microplate fluorescence screening assay based on ketoreductases (KREDs) and diaphorase activity to detect PET degradation products. Six PET-utilizing KREDs were identified, with KRED61 being the most efficient, which was combined with diaphorase from Clostridium kluyveri to monitor PET degradation catalyzed by a thermostable variant of cutinase-type polyesterase from Saccharomonospora viridis AHK190. The results from both fluorescence measurement and HPLC showed excellent correlation.
Article
Chemistry, Applied
Jiaqi Zhang, Zelin Zhang, Haohao Li, Yang Xu
Summary: A facile synthesis of a temperature-triggered fluorescence platform composed of boron-doped carbon nanoparticles (BCNPs) and polyethylene terephthalate (PET) was proposed as a convenient way to reuse PET plastic products. The fluorescence of this platform was tuned by incubation temperature and suitable for double-level anti-counterfeiting. With long-term heating regulation, multi-fluorescence emissions could be obtained as fluorescent codes. The platform had good anti-counterfeiting ability and provided a new way for the reuse of PET.
Article
Polymer Science
Mattanun Sangkhawasi, Tawun Remsungnen, Alisa S. Vangnai, Phornphimon Maitarad, Thanyada Rungrotmongkol
Summary: This study investigated the structural and dynamical properties as well as estimated glass transition temperature of PET/PEV blended polymers using molecular dynamics simulations. The results indicate that the 3/2 blending ratio showed the highest number of contacting atoms and potential hydrogen bonds, making it the most suitable ratio model for further experimental studies.
Article
Polymer Science
Chao Zhou, Chunda Ji, Yuchen Nie, Jingfa Yang, Jiang Zhao
Summary: This study provides single molecular evidence of cation binding to poly(ethylene oxide) (PEO) chains in aqueous solutions. The results show that the PEO chains are positively charged due to the binding of cations, and the addition of salt further increases the charging extent. The charging causes the chains to expand and increasing salt concentration leads to chain shrinkage, exhibiting a polyelectrolyte-like behavior.
Article
Chemistry, Physical
Toshiyuki Tamai, Mitsuru Watanabe, Rie Kakehashi, Yoshio Nakahara, Setsuko Yajima
Summary: This study investigated and controlled the properties of thin surface layers of polymer substrates for their application in electroless deposition. Different surface modification methods were used on PEN and PET substrates, and the chemical and physical properties of the modified layer were studied. The findings showed that the surface modification condition affected the oxygenation, functional groups, and fragments of the polymer chains, which in turn influenced the properties of the modified layer.
COLLOID AND POLYMER SCIENCE
(2023)
Article
Polymer Science
Chung-Hyok Jo, Yong-Man Jang, Dae-Hyok Mun, Chol-Jun Yu, Chung-Guk Choe, Song-Guk Ri
Summary: Organic phosphorus-nitrogen flame retardant was synthesized and used in coatings to enhance the flame retardancy. The addition of titanium dioxide further improved the flame retardancy of the coatings.
POLYMER DEGRADATION AND STABILITY
(2023)
Article
Polymer Science
Kirill Kirshanov, Roman Toms, Pavel Melnikov, Alexander Gervald
Summary: A method for producing nanocomposites using recycled PET as a matrix has been proposed, and it has been demonstrated that this method can yield nanocomposites with high mechanical properties.
Article
Engineering, Chemical
Gyanendra Singh
Summary: This paper studies the polarization state of light transmitted through flexible PET substrates. Interferograms of red and yellow light are recorded using a polarizing Mach-Zehnder interferometer. The amplitude and phase information of orthogonal polarization components are extracted and used to calculate Stokes parameters. The change in the state of polarization of the transmitted light is observed by plotting the calculated Stokes parameters on the Poincare sphere.
POLYMER ENGINEERING AND SCIENCE
(2022)
Article
Polymer Science
Chen-hui Huang, De-xiang Sun, Ying Wu, Xiao-ying Lu, Chao-qun Wu, Xiao-dong Qi, Jing-hui Yang, Yong Wang
Summary: Achieving the synchronous enhancement of fracture toughness and strength through the design of microstructures in blend composites is a great challenge. This study found that multi-walled carbon nanotubes (MWCNTs) selectively located at the two-phase interface of the blend and induced epitaxial crystallization of PET matrix, which improved interfacial adhesion and resulted in superior fracture toughness and strength. MWCNTs also enhanced heat resistance and antistatic property of the blend composites, expanding the application fields of PET.
Article
Polymer Science
Nicole E. Zander, Zachary R. Boelter
Summary: Recycled PET can be used as feedstock for material extrusion additive manufacturing, and its toughness can be improved by adding rubbers, leading to enhanced mechanical properties.
POLYMER INTERNATIONAL
(2021)
Article
Green & Sustainable Science & Technology
Aref Shahi, Behrooz Roozbehani, Mojtaba Mirdrikvand
Summary: This study aims to achieve more liquid products in the pyrolysis of PET by introducing a Lewis-Bronsted acid sites catalyst. The experimental results show that the maximum liquid product is 6% under certain conditions, and the optimum catalyst/PET mass ratio and temperature have been determined.
CLEAN TECHNOLOGIES AND ENVIRONMENTAL POLICY
(2022)
Article
Biology
Masao Suzuki, Nakahiro Yasuda, Hisashi Kitamura
INTERNATIONAL JOURNAL OF RADIATION BIOLOGY
(2020)
Article
Physics, Applied
Yuji Kishimoto, Shinichi Sasaki, Kazutoshi Takahashi, Kazuhiro Terasawa, Kentaro Miuchi, Masato Katsuta, Aiko Nagamatsu, Tetsuhito Fuse, Kunishiro Mori, Hisashi Kitamura
JAPANESE JOURNAL OF APPLIED PHYSICS
(2020)
Article
Nuclear Science & Technology
Satoshi Kodaira, Tamon Kusumoto, Hisashi Kitamura, Yuka Yanagida, Yasuhiro Koguchi
RADIATION MEASUREMENTS
(2020)
Article
Astronomy & Astrophysics
Masayuki Naito, Satoshi Kodaira, Ryo Ogawara, Kenji Tobita, Yoji Someya, Tamon Kusumoto, Hiroki Kusano, Hisashi Kitamura, Masamune Koike, Yukio Uchihori, Masahiro Yamanaka, Ryo Mikoshiba, Toshiaki Endo, Naoki Kiyono, Yusuke Hagiwara, Hiroaki Kodama, Shinobu Matsuo, Yasuhiro Takami, Toyoto Sato, Shin-ichi Orimo
LIFE SCIENCES IN SPACE RESEARCH
(2020)
Article
Nuclear Science & Technology
K. O. Inozemtsev, S. Kodaira, T. Kusumoto, H. Kitamura, A. Stradi, J. Szabo, I. Ambrozova, V. A. Shurshakov
Summary: This article presents and compares two etched track detector methods for measuring short-range particles, one involving intermittent etching and the other one-step etching. Both methods have been proven effective in identifying target nuclear fragments.
RADIATION MEASUREMENTS
(2021)
Article
Chemistry, Physical
Sunseng Pyon, Soichi Taya, Yuto Kobayashi, Ayumu Takahashi, Wenjie Li, Toshihiro Taen, Teng Wang, Gang Mu, Hisashi Kitamura, Ataru Ichinose, Tsuyoshi Tamegai
Summary: The study investigates the critical current density and vortex pinning properties in single crystals of a novel iron-based superconductor KCa2Fe4As4F2, showing significant enhancement of performance after irradiation. Vortex dynamics in KCa2Fe4As4F2 are found to be similar to (Ba,K)Fe2As2 to some extent, but different from Li0.8Fe0.2OHFeSe.
Article
Engineering, Aerospace
Mitsuki Hayashida, Kouichi Hagino, Takayoshi Kohmura, Masatoshi Kitajima, Keigo Yarita, Kenji Oono, Kousuke Negishi, Takeshi G. Tsuru, Takaaki Tanaka, Hiroyuki Uchida, Kazuho Kayama, Ryota Kodama, Koji Mori, Ayaki Takeda, Yusuke Nishioka, Takahiro Hida, Masataka Yukumoto, Yasuo Arai, Ikuo Kurachi, Hisashi Kitamura, Shoji Kawahito, Keita Yasutomi
Summary: XRPIX, a SOI pixel sensor developed for the next-generation x-ray astronomical satellite FORCE, integrates high-resistivity Si sensor and low-resistivity Si CMOS circuit. The new series XRPIX6E with PDD structure shows enhanced radiation hardness in proton irradiation experiments.
JOURNAL OF ASTRONOMICAL TELESCOPES INSTRUMENTS AND SYSTEMS
(2021)
Article
Oncology
Dakota Horendeck, Kade D. Walsh, Hirokazu Hirakawa, Akira Fujimori, Hisashi Kitamura, Takamitsu A. Kato
Summary: Proton therapy is a type of hadron radiotherapy with potentially higher biological effectiveness compared to X-rays. Experimental findings suggest that proton radiation induces the most cytotoxic effects near the Bragg peak, with extended cytotoxicity observed a few millimeters after the peak.
FRONTIERS IN ONCOLOGY
(2021)
Article
Biology
Daisuke Ohsawa, Yota Hiroyama, Alisa Kobayashi, Tamon Kusumoto, Hisashi Kitamura, Satoru Hojo, Satoshi Kodaira, Teruaki Konishi
Summary: This study aimed to investigate the effects of ultra-high dose rate FLASH exposure on DNA strand break induction. By comparing the results of conventional dose rate and ultra-high dose rate exposure in plasmid DNA, it was found that FLASH exposure significantly reduced the induction of single strand breaks, but had no significant effect on double strand breaks.
JOURNAL OF RADIATION RESEARCH
(2022)
Article
Oncology
Dylan J. Buglewicz, Kade D. Walsh, Hirokazu Hirakawa, Hisashi Kitamura, Akira Fujimori, Takamitsu A. Kato
Summary: DNA double-strand breaks (DSBs) are the main cause of cell death in carbon-ion radiation therapy (CIRT). Nuclear interactions between primary carbon ions and targets lead to nuclear fragmentation and the production of secondary particles. These particles travel to the tail region, causing unwanted biological effects. The density of DSBs within high-LET track structures plays a crucial role in inducing cell death.
FRONTIERS IN ONCOLOGY
(2022)
Article
Astronomy & Astrophysics
Masayuki Naito, Hisashi Kitamura, Masamune Koike, Hiroki Kusano, Tamon Kusumoto, Yukio Uchihori, Toshiaki Endo, Yusuke Hagiwara, Naoki Kiyono, Hiroaki Kodama, Shinobu Matsuo, Ryo Mikoshiba, Yasuhiro Takami, Masahiro Yamanaka, Hiromichi Akiyama, Wataru Nishimura, Satoshi Kodaira
Summary: The study demonstrates that composite materials have higher radiation shielding capabilities and can be used for components and fixtures of space vehicles. Compared to aluminum and polyethylene, the stopping power of composite materials used in the study is intermediate, and the total charge-changing cross sections per unit mass are also larger.
LIFE SCIENCES IN SPACE RESEARCH
(2021)
Article
Biology
Tamon Kusumoto, Taku Inaniwa, Kota Mizushima, Shinji Sato, Satoru Hojo, Hisashi Kitamura, Teruaki Konishi, Satoshi Kodaira
Summary: It has been observed that healthy tissues can be spared at ultra-high dose rates (UHDR: 40 Gy/s) in radiation therapy, known as the FLASH effect. This study investigates the mechanism of the FLASH effect by evaluating changes in the radiation chemical yield (G value) of 7-hydroxy-coumarin-3-carboxylic acid (7OH-C3CA) under different dose rates and oxygen conditions. The results suggest that UHDR irradiations with carbon-ion beams have the potential to spare healthy tissues, and the reaction between water radiolysis species formed by neighborhood tracks may be strongly related to the mechanisms of UHDR effect.
RADIATION RESEARCH
(2022)
Article
Environmental Sciences
Martin Kakona, Iva Ambrozova, Konstantin O. Inozemtsev, Ondrej Ploc, Raisa Tolochek, Lembit Sihver, Olena Velychko, Jan Chroust, Hisashi Kitamura, Satoshi Kodaira, Vyacheslav A. Shurshakov
Summary: SPACEDOS is a new open-source dosimeter developed for measuring cosmic radiation on spacecraft and small satellites. It is small, lightweight, and consumes low power. It can be customized for specific applications, such as pressurized cabins or vacuum environments. Its open-source design allows for better portability and reproducibility of results compared to other similar detectors. The detector has already been successfully used on the International Space Station and the obtained results have been compared with those of thermoluminescent detectors located in the same position as SPACEDOS.
RADIATION PROTECTION DOSIMETRY
(2022)
Article
Engineering, Aerospace
Kouichi Hagino, Mitsuki Hayashida, Takayoshi Kohmura, Toshiki Doi, Shun Tsunomachi, Masatoshi Kitajima, Takeshi G. Tsuru, Hiroyuki Uchida, Kazuho Kayama, Koji Mori, Ayaki Takeda, Yusuke Nishioka, Masataka Yukumoto, Kira Mieda, Syuto Yonemura, Tatsunori Ishida, Takaaki Tanaka, Yasuo Arai, Ikuo Kurachi, Hisashi Kitamura, Shoji Kawahito, Keita Yasutomi
Summary: This study evaluates the single event tolerance of the XRPIX x-ray silicon-on-insulator pixel sensor developed for the future x-ray astronomical satellite FORCE. Through measuring the single event upset (SEU) cross-section of the shift register on XRPIX, the saturation cross-section and threshold linear energy transfer (LET) are obtained. The estimated SEU rate in orbit is negligible due to the secondary particles induced by cosmic-ray protons.
JOURNAL OF ASTRONOMICAL TELESCOPES INSTRUMENTS AND SYSTEMS
(2022)
Article
Materials Science, Multidisciplinary
Akiyoshi Park, Ivan Veshchunov, Akinori Mine, Sunseng Pyon, Tsuyoshi Tamegai, Hisashi Kitamura
