Article
Chemistry, Inorganic & Nuclear
Shumpei Akita, Jing-Yao Guo, Falk W. Seidel, Matthew S. Sigman, Kyoko Nozaki
Summary: In this study, the impact of ligands in palladium complexes on the copolymerization of ethylene and methyl acrylate was analyzed using a statistical method. The electron density on the palladium center and the maximum width of the substituents on the phosphorus atom were found to be significant factors affecting the catalyst performance. Additionally, features such as the occupancy of the palladium d(z)(2) orbital and the bite angle of the ligand were shown to influence the reaction outputs. The experimental results were not always consistent with the predictions, possibly due to insufficient training data for certain catalysts. However, the unexpected finding that chlorination of the ligand backbone improved the overall catalyst performance provides inspiration for the development of PS catalysts.
Article
Polymer Science
Lixin Cao, Zhengguo Cai, Mingyuan Li
Summary: A series of nickel complexes with substituted phenylphosphine ligands were synthesized and characterized. These complexes showed high activity and thermal stability in norbornene polymerization. They could also copolymerize norbornene and methyl acrylate to produce functionalized cyclic olefin copolymer, and copolymerize ethylene and methyl acrylate to produce polar functionalized polyethylene.
Article
Polymer Science
Chaoqun Wang, Xiaohui Kang, Hongliang Mu, Zhongbao Jian
Summary: This study investigates the effect of polar solvents on ethylene polymerization. The results show that the use of tetrahydrofuran and 1,4-dioxane as polar solvents can increase the molecular weight, turnover frequency, and narrow the molecular weight distribution of the polymer, while maintaining the branching density. This promotes ethylene polymerization in a "living" manner and generates ultrahigh molecular weight polyethylene.
Article
Nanoscience & Nanotechnology
Wei Zhang, Yao Feng, Jalal T. Althakafy, Yi Liu, Hala M. Abo-Dief, Mina Huang, Liangchun Zhou, Fengmei Su, Chuntai Liu, Changyu Shen
Summary: In this study, a neutron shielding composite of UPEF/BN/PU was fabricated, which exhibited high shielding efficiency, small density, and flexibility. The composite showed excellent neutron shielding performance and mechanical properties.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2022)
Review
Polymer Science
Sonia B. Wahed, Colin R. Dunstan, Philip A. Boughton, Andrew J. Ruys, Shaikh N. Faisal, Tania B. Wahed, Bidita Salahuddin, Xinying Cheng, Yang Zhou, Chun H. Wang, Mohammad S. Islam, Shazed Aziz
Summary: The selection of biomaterials for biomedical implants is a significant challenge. UHMWPE and its composites are widely used due to their biocompatibility and high wear resistance. However, issues such as wear debris and oxidative degradation exist in UHMWPE implants, necessitating surface functionalization to enhance their performance.
Article
Chemistry, Multidisciplinary
Shuoyan Xiong, Manar M. Shoshani, Xinglong Zhang, Heather A. Spinney, Alex J. Nett, Briana S. Henderson, Thomas F. Miller, Theodor Agapie
Summary: Efficient copolymerization of acrylates with ethylene using Ni catalysts is challenging. This study reports two neutral Ni(II) catalysts with high thermal stability and characterizes nickel alkyl complexes generated during the process. Experimental kinetic studies suggest that monomer coordination and dissociation are fast relative to monomer migratory insertion, with monomer enchainment after tBA insertion as the rate-limiting step for copolymerization.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Engineering, Environmental
Xing Zhu, Tianyu Cui, Fan Su, Bin He
Summary: In this study, a highly sensitive and freely designed multidimensional detection flexible sensor was developed using low-density polyethylene (LDPE) tape as a model. The sensor did not change the characteristics of the PE material itself and retained the mechanical properties of the raw materials to a maximum extent. The lightweight, self-adhesive, and portable design of the sensors allows multiple sensors to work independently of each other and in concert for accurate sensing and monitoring of complex multidimensional directions.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Mechanics
Ji-Hun Cha, Sathish Kumar Sarath Kumar, Jung-Eon Noh, Joo-Seung Choi, YunHo Kim, Chun-Gon Kim
Summary: This study focuses on improving the interlaminar shear strength of UHC to enhance its cosmic radiation shielding performance for future satellites. The proposed material, with modifications such as polydopamine coating, MWCNT, and amine grafting, shows promising results and suitability for space environments.
COMPOSITE STRUCTURES
(2022)
Article
Polymer Science
Roberta Lopes do Rosario, Fotis Christakopoulos, Theo A. A. Tervoort, Fabrice Brunel, Timothy F. L. McKenna
Summary: Ultra-high molecular weight polyethylene (UHMWPE) with long chains and high molecular weight is difficult to process due to chain entanglements. By using inert condensing agents (ICA), the gas-phase polymerization of UHMWPE was developed to minimize entanglements and improve processability. Comparison with slurry revealed notable differences in crystallinity, lamellar thickness, molecular weight, and entanglements. Characterization techniques were used to measure reactor powder properties and analyze the impact of alkanes. Solid-state drawability analysis and scattering techniques provided insights into the entanglements and crystal formation.
JOURNAL OF POLYMER SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Shuo Li, Ruchira Colaco, Anne Staubitz
Summary: Diazocine-functionalized initiators were synthesized for controlled radical polymerizations, and their efficiency in polymerizations of methyl acrylate and methacrylate was tested. The initiation of the reactions required high amounts of reducing agents and catalysts. Additionally, violet light irradiation during the reactions caused retardation or termination of the anilide compound.
ACS APPLIED POLYMER MATERIALS
(2022)
Review
Polymer Science
Ming Yuan, Dayun Huang, Yixuan Zhao
Summary: This article reviews the application and the relationship between the physical properties and molecular weight of PMMA, as well as different methods and mechanisms for preparing high molecular weight PMMA.
Article
Materials Science, Composites
Qianyu Zhang, Zixuan Liu, Zhigang Qin, Ruosi Yan, Lixia Jia
Summary: This study successfully prepared STF/UHMWPE flexible composites with significantly higher impact resistance compared to pure UHMWPE fabric, exhibiting high energy absorption capability in impact tests. The composites with different parameters showed minor fractures during impact testing, with the main energy absorption mechanisms being fabric deformation and friction between the impact head and nanoparticles.
COMPOSITES COMMUNICATIONS
(2021)
Article
Engineering, Chemical
Mei Chen, Yuming Chen, Wei Li, Peng Liang, Congjing Ren, Binbo Jiang, Jingdai Wang, Yongrong Yang
Summary: A facile catalytic approach utilizing POSS-modified MgCl2-based Ziegler-Natta catalyst was reported for preparing fine UHMWPE particles, resulting in the synthesis of nascent UHMWPE with less entangled state and fine particle size. This combination of structural advantages significantly improved the toughness/stiffness/strength balance of nascent UHMWPE, especially achieving an impact strength of 113.6 kJ/m(2) with a relatively low molecular weight.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Polymer Science
Wenhao Li, Zhenhua Wang, Ningning Liu, Jinzhu Zhang
Summary: The tribological characteristics of ultra-high molecular weight polyethylene (UHMWPE) under unsaturated lubrication of water and brine were studied. The effect of load and speed on the friction properties of UHMWPE were analyzed. The results showed that the lubrication form of UHMWPE gradually transited from saturated lubrication to unsaturated lubrication with the increase in load or speed. Under brine-unsaturated lubrication, the anti-friction property of UHMWPE was better than that in water-unsaturated lubrication at high speed. The wear resistance of UHMWPE also varied under different lubrication conditions.
Article
Polymer Science
Panpan Zhang, Qiongqiong Xu, Wenyu Mao, Jiaxing Lv, Haodong Tang, Huadong Tang
Summary: A novel synthesis of ultrahigh molecular weight PMMA has been developed using organosulfur compounds and transition metal carboxylates as initiators. The use of 1-octanethiol and palladium trifluoroacetate as an initiator combination showed high efficiency. The produced PMMA and palladium nanoparticles were characterized using various techniques.
Article
Materials Science, Multidisciplinary
Maojiang Zhang, Minglei Wang, Mingxing Zhang, Qianhong Gao, Xinxin Feng, Yumei Zhang, Jiangtao Hu, Guozhong Wu
ORGANIC ELECTRONICS
(2020)
Article
Chemistry, Physical
Mingxing Zhang, Mengjia Yuan, Maojiang Zhang, Minglei Wang, Junchang Chen, Rong Li, Long Qiu, Xinxin Feng, Jiangtao Hu, Guozhong Wu
RADIATION PHYSICS AND CHEMISTRY
(2020)
Article
Nanoscience & Nanotechnology
Mingxing Zhang, Junchang Chen, Maojiang Zhang, Rong Li, Minglei Wang, Long Qiu, Mengjia Yuan, Xinxin Feng, Zhe Xing, Jiangtao Hu, Guozhong Wu
ACS APPLIED MATERIALS & INTERFACES
(2020)
Article
Materials Science, Paper & Wood
Minglei Wang, Maojiang Zhang, Qianhong Gao, Yinjie Liu, Mingxing Zhang, Rongfang Shen, Yumei Zhang, Jiangtao Hu, Guozhong Wu
Article
Chemistry, Multidisciplinary
Rong Li, Xinxin Feng, Mingxing Zhang, Zhe Xing, Guozhong Wu
Summary: This study explored the amidoximation of polymer sorbents in aqueous solution, which proved to be cost-effective, environmentally friendly, and achieved comparable uranium adsorption capacities compared to using mixed water-organic solvents. Additionally, a neutral NH2OH aqueous solution was found to significantly enhance the uranium adsorption capacities, and potassium hydroxide treatment was crucial for increased adsorption.
Article
Engineering, Chemical
Chenguang Yang, Kun Yan, Xin Wen, Peijun Cai, Guozhong Wu
Summary: This study prepared a high-performance polypropylene foam through radiation-induced grafting and supercritical CO2 foaming, demonstrating excellent thermal insulation and waterproof properties, which can be applied in lightweight insulation materials.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Materials Science, Paper & Wood
Yulong Li, Zhi Xiong, Mingxing Zhang, Yulong He, Yan Yang, Youwei Liao, Jiangtao Hu, Minglei Wang, Guozhong Wu
Summary: In this study, a practical strategy was developed to create an anti-abrasion and durable superhydrophobic wood surface with UV resistance using a sol-gel method and EB curing technology. The resulting wood displayed excellent water repellency and resistance to harsh external environments, showcasing its potential applications in furniture and architecture.
Article
Chemistry, Physical
Zhenyan Ji, Fan Zhang, Hongbing Chen, Rongfang Shen, Weirong He, Zhe Xing, Guozhong Wu
Summary: This study investigated the free radicals generated in epoxy resin samples exposed to gamma irradiation in different environments, revealing that the radicals formed in air were more abundant than in vacuum. The radical concentration increased up to a dose of 500 kGy and approached saturation at 1000 kGy, with the radicals disappearing upon annealing.
RADIATION PHYSICS AND CHEMISTRY
(2022)
Article
Materials Science, Paper & Wood
Zhi Xiong, Yulong Li, Mingxing Zhang, Xuanzhi Mao, Rongfang Shen, Jiangtao Hu, Qianhong Gao, Minglei Wang, Guozhong Wu
Summary: The study presents a method for immobilizing graphitic carbon nitride onto cotton fabric using electron beam irradiation, resulting in a durable photocatalytic coating with excellent degradation activity. The immobilized coating remained stable even after multiple laundering cycles.
Article
Polymer Science
Xinxin Feng, Yulong He, Zhe Xing, Mingxing Zhang, Rong Li, Guozhong Wu
Summary: Aminated PE/PP NWF was synthesized through radiation grafting and ring-opening reaction, and its adsorption performance on Pt(IV) was investigated under different parameters. The results showed that the adsorbent had high adsorption capacity, good adsorption selectivity, and excellent performance over a wide pH range.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Chemistry, Physical
Fan Zhang, Zhenyan Ji, Qiang Zhang, Rongfang Shen, Zhe Xing, Guozhong Wu
Summary: This study investigated the species and decay behaviors of free radicals generated in COCs during radiation sterilization using electron spin resonance spectroscopy. It also proposed a free radical reaction mechanism for COCs under different post-processing conditions.
RADIATION PHYSICS AND CHEMISTRY
(2023)
Article
Nuclear Science & Technology
Wan-Ning Ren, Xin-Xin Feng, Yu-Long He, Ming-Lei Wang, Wan-Feng Hong, Hong-Wei Han, Jiang-Tao Hu, Guo-Zhong Wu
Summary: Direct collection of uranium from low uranium systems via adsorption remains challenging. Fibrous sorbent materials with amidoxime (AO) groups are promising adsorbents for uranium extraction from seawater. The utilization of AO adsorption groups is improved by fabricating a branched structure containing AO groups on polypropylene/polyethylene spun-laced nonwoven (PP/PE SNW) fibers using grafting polymerization induced by radiation (RIGP). The adsorbent material shows a high adsorption capacity and good stability, demonstrating its potential for seawater uranium extraction.
NUCLEAR SCIENCE AND TECHNIQUES
(2023)
Article
Polymer Science
Chunlei Dong, Xuanzhi Mao, Qingru Liang, Minglei Wang, Maojiang Zhang, Jianbing Chen, Jiangtao Hu, Guozhong Wu
Summary: In this study, a novel organic-inorganic hybrid material (PMMA-HBPSi) derived from methyl methacrylate and hyperbranched polysiloxane was fabricated via gamma-radiation curing. The hybrid material exhibited improved thermal stability, optical characteristics, and dielectric properties, as well as reduced UV transmittance. The findings suggest that this new approach is suitable for developing high-performance organic glasses for optical, aviation, and electronic applications.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Chemistry, Physical
Qingshi Guo, Dean Shi, Chenguang Yang, Guozhong Wu
Summary: Efficient oil-water separation foam material was prepared through surface engineering with hydrophobic groups introduced onto the foam surface. The modified foam exhibited excellent hydrophobicity and oil removal rate, and maintained stability in a wide range of pH conditions.
Article
Chemistry, Physical
Minglei Wang, Qianhong Gao, Mingxing Zhang, Yulong He, Yumei Zhang, Rongfang Shen, Jiangtao Hu, Guozhong Wu
Summary: The study successfully immobilized cobalt ions on polypropylene nonwoven fabric through irradiation graft polymerization, creating efficient and stable reaction sites for activating peroxymonosulfate to degrade organic pollutants. The prepared catalyst exhibited efficient removal of dyes or antibiotics, paving the way for new research in terms of substrate size and catalytic processes.
JOURNAL OF MATERIALS CHEMISTRY A
(2021)
Article
Chemistry, Physical
A. Khallouqi, A. Halimi, O. El Rhazouani
Summary: A pediatric head phantom made of epoxy resin was used to evaluate radiation exposure in CT scans. The phantom demonstrated dosimetric properties comparable to commercially available phantoms, making it a practical and economical option for assessing radiation dose in children.
RADIATION PHYSICS AND CHEMISTRY
(2024)
Article
Chemistry, Physical
M. Y. Shoeib, Doaa A. Ahmed, A. F. Abd-Elraheem
Summary: The research aims to measure and analyze the levels of radon concentration, radium concentration, and radon exhalation rates in geopolymer cement mixes, and assess their impact on indoor air quality. Results indicate that geopolymer cement materials are safe for use in construction, except for specific mixes.
RADIATION PHYSICS AND CHEMISTRY
(2024)
Article
Chemistry, Physical
M. J. Leotlela
Summary: This article presents the results of radiochemical events/processes that occur when water is exposed to ionising radiation of charged particles (beta and alpha-particles). The idea of cogeneration becomes even more lucrative if we consider that hydrogen energy generation is clean (also known as green energy) because of its insignificant contribution to environmental pollution. These results supplement the fluctuation in effective dose theory/hypothesis of a previous study on time-dependent variations in the radiological health impact of an interim SNFS facility presented in 2021 (Leotlela, 2021).
RADIATION PHYSICS AND CHEMISTRY
(2024)
Article
Chemistry, Physical
Vyacheslav Ivanovich Pavlenko, Roman Vladimirovich Sidelnikov, Vitaly Valerievich Kashibadze, Mikhail Igorevich Dobynde, Dmitry Alexandrovich Kartashov, Vyacheslav Alexandrovich Shurshakov
Summary: This work explores the possibility of using a polymer composite to protect against neutron radiation in space conditions. The study shows that the proposed polymer composite has high structural properties necessary for use in space. Monte Carlo simulation is used to evaluate the neutron radiation passage through the material. The results demonstrate that the protective layer made of the polymer composite is thinner and more suitable for spacecraft, which is crucial due to limited space on board.
RADIATION PHYSICS AND CHEMISTRY
(2024)
Article
Chemistry, Physical
Islam G. Alhindawy, M. I. Sayyed, Dalal Abdullah Aloraini, Aljawhara H. Almuqrin, Mohammad S. Alomar, Gaber A. Elawadi, K. A. Mahmoud
Summary: This study investigated the effects of Neodymium (III) nitrate hexahydrate and lanthanum nitrate hexahydrate on the structural and radiation shielding properties of zircon mineral, and a new La/Nb-doped ZrO2 nanocomposite was fabricated. Experimental techniques such as energy-dispersive X-ray, scanning electron microscope, transmission electron microscopy, and X-ray diffraction pattern were used to analyze the structure and composition of the fabricated nanocomposites. Monte Carlo simulation was employed to evaluate the gamma-ray shielding properties. The results showed that the fabricated composites had good shielding characteristics, with a shielding capacity of 30-50% compared to pure lead in the intermediate energy range of 0.244-2.506 MeV.
RADIATION PHYSICS AND CHEMISTRY
(2024)
Article
Chemistry, Physical
Hassan Salah, Mohammed Alkhorayef, Layal Jambi, Mohammed Almuwanis, Abdelmoneim Sulieman
Summary: Cardiovascular nuclear medicine imaging examinations expose patients to high doses of ionizing radiation. This study assessed the radiation doses and public exposure in cardiac rest and stress SPECT scans. The effective dose from cardiac stress was higher than previous studies, which may be influenced by clinical indication imaging protocols and radiation safety measures.
RADIATION PHYSICS AND CHEMISTRY
(2024)
Article
Chemistry, Physical
Leandro Barbosa da Silveira Gatto, Delson Braz, Leonardo Pacifico, Paulo Travassos, Luis Alexandre Goncalves Magalhaes
Summary: This study evaluated the mean glandular dose (MGD) in mammography using a computed radiography (CR) system with a solid-state detector. Irradiations and simulations were conducted to determine the MGD and spectra for the same conditions. The results showed that the glandular dose was below the acceptable levels and the spectra were mostly in accordance with the literature.
RADIATION PHYSICS AND CHEMISTRY
(2024)
Article
Chemistry, Physical
Mawya Khafaji, Rashid Barnawi, Salma Amoudi, Hassan Gabbani, Rayan Alhazmi, Rayan Ahyad, Khalid Alsafi, Khuld Saeedi, Hassan Salah, Nissren Tamam, David Bradley, Sarah Albahiti, Abdelmoneim Sulieman
Summary: This study aimed to calculate typical values for common pediatric studies at King Abdulaziz University Hospital and compare them with other studies. The results showed that radiation dose levels in pediatric CT examinations were generally lower compared to other studies.
RADIATION PHYSICS AND CHEMISTRY
(2024)
Article
Chemistry, Physical
Faisal Almisned, Iskender Akkurt, Nurdan Karpuz
Summary: In this study, cross sections of medical radioisotopes were calculated using level density models. The results were compared with experimental data and it was found that the GSM level density models generally yielded consistent conclusions.
RADIATION PHYSICS AND CHEMISTRY
(2024)
Article
Chemistry, Physical
Shokufeh Saeid, Neda Mollakhalili-meybodi, Fateme Akrami Mohajeri, Farzan Madadizadeh, Elham Khalili Sadrabad
Summary: This study found that gamma irradiation significantly reduces the saponin and phytic acid content of quinoa. At a dose of 2.5 kGy, it can effectively reduce saponin and phytic acid without significantly damaging the antioxidant compounds.
RADIATION PHYSICS AND CHEMISTRY
(2024)
Article
Chemistry, Physical
Maria Demeter, Ion Calina, Anca Scarisoreanu, Valentina Mitran, Marcela Popa, Anisoara Cimpean, Mariana Carmen Chifiriuc, Marin Micutz, Elena Matei, Bogdana Mitu
Summary: Novel biocompatible composite hydrogels with good elastic and antimicrobial properties were synthesized by e-beam cross-linking using chitosan, water-soluble polymers, and silver nanoparticles (AgNP). The composite hydrogels showed high stability, absorption capability specific to infected wounds, and biocompatibility. The antimicrobial activity was influenced by the amount of AgNP and cross-linking degree, with significant inhibition against Gram-negative bacteria.
RADIATION PHYSICS AND CHEMISTRY
(2024)
Article
Chemistry, Physical
Anuor AT. Ayoub, Yushou Song, Mamoun IA. Sagiroun
Summary: This paper presents an assessment of the radiological hazard for humans from nuclear power plant effluent released into a river under normal operation scenarios. The study concludes that the radiological hazard from this effluent is minimal and within acceptable limits according to international standards. It also highlights the potential hazards related to the higher concentration of 137Cs in sediments over time.
RADIATION PHYSICS AND CHEMISTRY
(2024)
Article
Chemistry, Physical
Irabati Chakraborty, Nidhi Sinha, Bobby Antony
Summary: This article investigates the electron impact ionization of prebiotic molecules within the interstellar medium. By calculating the electron impact ionization cross section, the study provides insights into the chemistry of these molecules and their interaction with electrons, which play a vital role in the emergence of life's essential building blocks.
RADIATION PHYSICS AND CHEMISTRY
(2024)
Article
Chemistry, Physical
C. V. Vishnu, Antony Joseph
Summary: This study investigated the gamma-ray shielding properties of composite materials made from natural rubber with different proportions of Barium Tungstate. The addition of Barium Tungstate significantly improved the characteristics of gamma radiation shielding. The experimental measurements showed good agreement with theoretical calculations obtained from simulation results.
RADIATION PHYSICS AND CHEMISTRY
(2024)
Article
Chemistry, Physical
Derya Mutlu, Idris Karagoz, Harun Sepetcioglu, Urkiye Akar Tarim, Orhan Gurler
Summary: This study examined the properties of epoxy composites with dendritic copper particles and found that the addition of copper particles improved the electrical conductivity and mechanical properties of the composites. The glass transition temperature of the composites could be adjusted by varying the copper particle ratio. The study also evaluated the shielding properties of epoxy-based composites against gamma radiation and found that the addition of copper particles significantly altered the microstructure and mechanical properties of the composites.
RADIATION PHYSICS AND CHEMISTRY
(2024)
