Article
Multidisciplinary Sciences
Daeyeon Won, Jin Kim, Joonhwa Choi, HyeongJun Kim, Seonggeun Han, Inho Ha, Junhyuk Bang, Kyun Kyu Kim, Youngseok Lee, Taek-Soo Kim, Jae-Hak Park, C-Yoon Kim, Seung Hwan Ko
Summary: Researchers have developed a new ultrafast and biocompatible digital patterning process for PEDOT:PSS hydrogel via laser-induced phase separation. This method enhances the electrical properties and water stability of PEDOT:PSS, and enables the fabrication of hydrogel electrodes with high electrical conductivity and spatial resolution.
Article
Physics, Applied
Sophie Schoenfeld, Felix Baier, Jennifer Jungklaus, Gerald Hoerner, Simon Winterstein, Axel Enders, Juergen Senker, Birgit Weber
Summary: This study investigates three novel iron(II) coordination compounds, two of which exhibit spin crossover behavior and were analyzed using XPS and impedance spectroscopic measurements to reveal the complex spin crossover behavior.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Physical
Shawn A. Gregory, Riley Hanus, Amalie Atassi, Joshua M. Rinehart, Jamie P. Wooding, Akanksha K. Menon, Mark D. Losego, G. Jeffery Snyder, Shannon K. Yee
Summary: A model is developed to describe the behavior of charge carriers in semiconducting polymers and quantify charge carrier localization and other transport parameters. By measuring temperature-dependent electrical conductivity, Seebeck coefficient, and extent of oxidation, a semi-localized transport (SLoT) model is developed to capture both localized and delocalized transport contributions. The SLoT model improves the ability to predict and tailor electronic properties of doped semiconducting polymers.
Article
Chemistry, Multidisciplinary
Ian E. Jacobs, Yue Lin, Yuxuan Huang, Xinglong Ren, Dimitrios Simatos, Chen Chen, Dion Tjhe, Martin Statz, Lianglun Lai, Peter A. Finn, William G. Neal, Gabriele D'Avino, Vincent Lemaur, Simone Fratini, David Beljonne, Joseph Strzalka, Christian B. Nielsen, Stephen Barlow, Seth R. Marder, Iain McCulloch, Henning Sirringhaus
Summary: Molecular doping using redox-active small molecules as dopants for organic semiconductors has attracted increased research interest for various emerging applications. A recent breakthrough in ion-exchange based doping separates the redox and charge compensation steps, leading to high conductivity and ion exchange efficiencies in excess of 99%. Factors enabling high performance include the choice of solvent and increased doping strength, illustrating a connection between electrochemical doping and ion exchange while highlighting limitations in stability at high redox potential.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Physical
Dominik Farka, Kristian Kriz, Jindrich Fanfrlik
Summary: In this study, we demonstrate the substitution effect of PEDOT analogues on planarity as an intrinsic indicator for electronic performance using quantum mechanical simulations. We show that the omega B97X-V functional is useful for simulating chalcogen bonds and confirm that these bonds stabilize the planar conformation of PEDOT. Our findings have implications for the design of conductive polymers, with the modulation of chalcogen bond strength playing a significant role.
JOURNAL OF PHYSICAL CHEMISTRY A
(2023)
Article
Chemistry, Physical
M. M. Abdelhamid, A. Atta, A. M. Abdel Reheem, A. H. Ashour
Summary: The optical and electrical properties of Ge10Se70Bi20 thin films were studied by irradiation with ion beams. The results showed changes in the energy gap and band tail after irradiation, with a significant increase in conductivity after exposure to oxygen ion beam. This suggests that the irradiated Ge10Se70Bi20 thin films could be used in important applications such as optical data storage and optoelectronic devices.
SURFACE INNOVATIONS
(2022)
Article
Chemistry, Multidisciplinary
Jinyi Zhang, Jing Zuo, Shaonan Xu, Ankun Ju, Wenhua Yuan, Jiupeng Zhang, Cundi Wei
Summary: Conductive powders with low volume resistivity and high thermal conductivity were prepared through acid leaching and coating. The resulting composite material showed improved antistatic properties and mechanical strength, making it suitable for industrial production. The unique material structure contributed to the excellent performance.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2022)
Article
Materials Science, Ceramics
Pinar Kaya, Y. Eren Suyolcu, Peter A. van Aken, Servet Turan, Giuliano Gregori, Joachim Maier
Summary: The addition of Yb2O3 to Sm-bearing AlN ceramics significantly reduces thermal conductivity and increases grain boundary resistivity. On the other hand, the use of Sm2O3 as a sintering aid leads to an increase in electrical resistivity due to secondary phases at grain boundaries and triple junctions.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Physical
Jinhwan Byeon, Dowon Kim, Minkyu Kyeong, In Gyu Bak, Sukwon Hong
Summary: Novel acetal-functionalized indacenodithiophene (IDT) moieties were synthesized and used to create conductive polymers. These polymers have the potential to reduce thermal conductivity without affecting electrical conductivity due to their high charge-carrier mobility. A new strategy was proposed to control the dopant position near the polymer backbone using a Lewis acid-base complex. The resulting polymer exhibited increased doping efficiency and electrical conductivity, as well as reduced thermal conductivity, leading to the development of a high-performance thermoelectric material.
CHEMISTRY OF MATERIALS
(2023)
Article
Materials Science, Composites
J. Rashmi, Poornima, J. Sundara Rajan
Summary: A hybrid combination of carbon fillers is used in an epoxy matrix to improve DC/AC conductivity and dielectric constant. The study investigates the influence of electrical percolation on mechanical strength, thermal stability, thermal expansion coefficient, and flame properties. Different weight proportions of multiwalled carbon nanotubes and graphene nanoplatelets are added to the epoxy matrix to understand their impact on electrical, mechanical, and thermal properties. It is observed that the weight fraction of carbon fillers at electrical percolation negatively affects mechanical and flame properties, slightly affects thermal stability, and decreases the coefficient of thermal expansion. Below the percolation level, the weight fractions enhance mechanical and flame properties. The formation of a network of carbon fillers enhances electrical conduction and thermal expansion, but does not show a significant effect on mechanical and flame properties due to other factors.
POLYMER COMPOSITES
(2023)
Article
Materials Science, Multidisciplinary
Xiao Cui, Keyu Ji, Taiping Zhang, Bingjun Wang, Wei Sha, Zilong Dong, Yuanhong Shi, Chunsheng Jiang, Qilin Hua, Weiguo Hu
Summary: This paper investigates the influence of low-fluence neutron irradiation on the electrical properties of AlGaN/GaN HEMTs. The results show that the output performance of the irradiated samples changes similarly, with almost no changes or slight decreases near the knee voltage. As for the leakage current, samples irradiated with different fluences exhibit different characteristics. Simulations using Crosslight software further reveal that low-fluence neutron irradiation primarily affects the 2DEG mobility and surface states of the HEMTs.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Materials Science, Ceramics
Shalini Rajpoot, Jang-Hoon Ha, Young-Wook Kim
Summary: The mechanical, thermal, and electrical properties of porous SiC ceramics can be independently tuned by selecting the appropriate starting particle size and sintering atmosphere. In the porosity range of 40% to 54%, the compressive strength and thermal conductivity of porous SiC ceramics increased as the porosity increased, contrary to the general trend. Additionally, the electrical conductivity of porous SiC ceramics sintered in N-2 atmosphere was significantly higher compared to those sintered in Ar atmosphere due to N doping in the PCS-derived beta-SiC.
CERAMICS INTERNATIONAL
(2021)
Article
Engineering, Environmental
Hansol Lee, Su Bin Lee, Young -Shin Kim, Hoimin Kim, Min -Jae Kim, Tae Woong Yoon, Dongki Lee, Jeong Ho Cho, Yun-Hi Kim, Boseok Kang
Summary: The effect of molecular structure on the microstructure and thermoelectric properties of donor-acceptor-type conjugated polymers based on isoindigo (IID) unit was investigated. The crystallinity and molecular packing of the polymers were found to change significantly depending on the symmetry of the donor unit copolymerized with the IID unit, resulting in differences in the doping and charge transport characteristics. A polymer with high crystallinity and fibril-like crystalline network showed excellent thermoelectric performance due to its highly ordered structure, exhibiting a high power factor of 212 μWm-1K-2 upon doping. This study demonstrates the potential of IID unit as a promising building block for high-performance conjugated polymers for thermoelectric applications and provides important guidelines for the design of IID-based polymers with high thermoelectric performance.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Polymer Science
Yaroslav O. Mezhuev, Igor Y. Vorobev, Ivan Plyushchii, Efrem G. Krivoborodov, Alexander A. Artyukhov, Mikhail Motyakin, Anna L. Luss, Irina S. Ionova, Alexander L. Kovarskii, Igor A. Derevnin, Valerie A. Dyatlov, Ruslan A. Alekperov, Ilya Y. Toropygin, Mikhail A. Volkov, Mikhail Shtilman, Yuri Korshak
Summary: The kinetic regularities of the initial stage of chemical oxidative polymerization of methylene blue under the action of ammonium peroxodisulfate in an aqueous medium have been studied. The polymerization mechanism includes chain initiation and growth stages, with the rate of the initial reaction stage following a first-order kinetic equation. The structure of the polymethylene blue chain has been proposed based on various spectroscopic methods, showing metallic luster and electrical conductivity due to conjugation and charge transfer complexes.
Article
Chemistry, Multidisciplinary
Yang Lu, Zi-Di Yu, Hio-Ieng Un, Ze-Fan Yao, Hao-Yang You, Wenlong Jin, Liang Li, Zi-Yuan Wang, Bo-Wei Dong, Stephen Barlow, Elena Longhi, Chong-an Di, Daoben Zhu, Jie-Yu Wang, Carlos Silva, Seth R. Marder, Jian Pei
Summary: A simple solution-based co-deposition method has been reported to achieve high conductivity n-doped polymers. These polymers exhibit surprising structural tolerance and excellent miscibility with commonly used n-dopants, allowing high concentrations and high mobility of charge carriers simultaneously, resulting in excellent electrical conductivity and thermoelectric performance.
ADVANCED MATERIALS
(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)