Article
Polymer Science
Jian-Jun He, Hai-Xia Yang, Feng Zheng, Shi-Yong Yang
Summary: Fluorinated aromatic polyimide (FAPI) films with rigid polymer backbones were prepared by chemical imidization approach. These films exhibited excellent mechanical properties, thermal stability, and transparency, as well as stable electrical properties in high frequency range.
Article
Chemistry, Multidisciplinary
Yuki Nagao, Yuze Yao, Hayato Watanabe, Mitsuo Hara, Shusaku Nagano
Summary: In this study, a new sulfonated semialicyclic oligoimide was synthesized to investigate the influence of molecular organized structure and proton conductivity with lower molecular weight. The thin film exhibited a high conductivity under humidified conditions.
Article
Chemistry, Physical
Hamish Cavaye, Rebecca J. L. Welbourn, Jan G. Gluschke, Paul Hughes, Ky Nguyen, Adam P. Micolich, Paul Meredith, A. Bernardus Mostert
Summary: This study systematically investigated the hydration status of Nafion thin films at different relative humidities, using the reflection signals of H2O and D2O vapours to quantify the hydration layers. The number of hydration layers continuously increases with humidity, rather than forming abruptly. The results are crucial for quantifying the hydration dependence of Nafion thin films and understanding Nafion/semiconductor devices.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Nisar Ali, Farman Ali, Saboor Khan, Zeshan Ali Sheikh, Amir Said, Zahid Nawaz, Ihsanullah Ihsanullah, Muhammad Bilal
Summary: Nafion/sulfonated polyimide (SPI-x) composite membranes were fabricated by incorporating SPI with different ratios of Nafion, demonstrating improved physicochemical properties such as ion exchange capacity and thermal stability. Various analytical techniques confirmed the structure and performance of the composite membranes, with the morphology closely related to the SPI content.
JOURNAL OF MOLECULAR STRUCTURE
(2021)
Article
Chemistry, Physical
Jun Liu, Haorui Duan, Wenjie Xu, Jun Long, Wenheng Huang, Huan Luo, Jinchao Li, Yaping Zhang
Summary: A novel sulfonated multi-wall carbon nanotubes filler was synthesized and prepared for application in vanadium redox flow batteries. The optimized composite membrane showed improved barrier properties and selectivity, leading to higher coulombic and energy efficiencies compared to commercial Nafion 212 membrane.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Multidisciplinary
Zongfan Yang, Pei Chen, Wenjing Hao, Zhen Xie, Yu Feng, Guolong Xing, Long Chen
Summary: This work presents a strategy for exploring proton-conducting frameworks by engineering pore walls and installing proton-containing polymers into the pores. The synthesis of amide-linked and sulfonated frameworks with high crystallinity and channel ordering greatly increases proton conductivity, enabling a stable continuous run. These results suggest a way to explore proton-conducting COFs via systematic engineering of the wall and space of the open nanochannels.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Computer Science, Information Systems
Jiahao Xie, Lijun Zhang
Summary: Indium selenide (InSe) possesses a unique intrinsic large out-of-plane oriented luminescent dipole, which can enhance optical signal in bent regions of materials. The optical emission enhancement in bent InSe thin films is dependent on thickness, incident light orientation, and excitation photon energy, with significant enhancement observed at excitation photon energies lower than a specific transition energy. These findings provide valuable insights for modulating the luminescent properties of InSe films for flexible optoelectronic device applications.
SCIENCE CHINA-INFORMATION SCIENCES
(2021)
Article
Nanoscience & Nanotechnology
Jie Yang, Longzhi Tong, Abdullah Saad Alsubaie, Khaled H. Mahmoud, Yanyan Guo, Lei Liu, Li Guo, Zhihua Sun, Chao Wang
Summary: This paper focuses on the preparation and fuel cell application of an organic-inorganic composite membrane. By introducing metal-organic framework as filler, the composite membrane shows enhanced peak stress intensity and proton conductivity, which can be attributed to the unique structure of the filler and the synergistic effect of amino modification.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2022)
Article
Polymer Science
Ayyanar Balasubramanian, Monica Gunasekaran, Tharanikkarasu Kannan
Summary: Stilbene-containing sulfonated polyimide membranes were successfully synthesized and characterized in this study. The photo-crosslinked membranes exhibited improved hydrolytic, tensile, and oxidative stability, as well as good performance in fuel cell applications.
EUROPEAN POLYMER JOURNAL
(2022)
Article
Chemistry, Applied
Fang-Ru Lin, Zhi-Yuan Liu, Han Zhang, Meng Liu, Hong-Bin Luo, Yang Zou, Xiao-Ming Ren
Summary: The development of a highly efficient sensor for detecting formic acid is crucial for monitoring air quality and determining leakage. In this study, a proton conductive metal-organic framework (MOF) thin film, specifically MOF-801, was found to exhibit exceptional chemical stability and proton conduction, making it a superior sensing material for formic acid detection at room temperature. The resulting sensor based on MOF-801 thin films showed exceptional sensitivity, selectivity, and durability, outperforming other MOF-based sensors and traditional metal-oxide-based sensors that operate at high temperatures.
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
Article
Materials Science, Paper & Wood
Thomas Bayer, Benjamin Vaughan Cunning, Bretislav Smid, Roman Selyanchyn, Shigenori Fujikawa, Kazunari Sasaki, Stephen Matthew Lyth
Summary: Nanocellulose, after sulfonation, shows enhanced conductivity and is promising for fuel cell applications. Spray-coated cellulose membranes exhibit high current density and power density in fuel cells.
Article
Engineering, Chemical
Jun Liu, Jun Long, Wenheng Huang, Wenjie Xu, Xiujuan Qi, Jinchao Li, Yaping Zhang
Summary: A novel diamine monomer with imino groups is synthesized and four branched sulfonated polyimide membranes are developed for VFB application. These membranes break the trade-off between proton conduction and vanadium ion blocking and enhance stability through hydrogen bonds network and Donnan repulsion effect. The proton selectivity of I-bSPI-50 membrane is 4.6 times that of Nafion 212 membrane, and it exhibits superior coulomb and energy efficiencies as well as high capacity holding abilities during 600-time cycles. This work demonstrates a promising pathway for obtaining cost-effective membrane for VFB application through hydrogen bonds construction strategy.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Polymer Science
Muhammad Shoaib Bhutta, Shakeel Akram, Pengfei Meng, Jerome Castellon, Serge Agnel, Hui Li, Yecai Guo, Ghulam Rasool, Shahid Hussain, Muhammad Tariq Nazir
Summary: The study observed steady-state electrical conduction current for single and multilayer polyimide (PI) nanocomposite films at different temperatures, finding that the dominant conduction mechanisms were space charge limited current (SCLC) and Poole-Frenkel current. At high electric fields, ohmic conduction was replaced by current-voltage dependency. Nanocomposite films exhibited higher conduction current at lower temperatures, but it declined at higher temperatures.
Article
Engineering, Chemical
Jun Long, Wenjie Xu, Shoubin Xu, Jun Liu, Yanlin Wang, Huan Luo, Yaping Zhang, Jinchao Li, Liangyin Chu
Summary: A novel double branched sulfonated polyimide (dbSPI) membrane with high proton selectivity and ultra-low vanadium ion permeability was successfully synthesized, showing much longer self-discharge time and superior capacity retention in VRFB single cell assembly compared to the Nafion 212 membrane. The optimized dbSPI-50 membrane also demonstrated higher coulomb efficiency and energy efficiency after 300 charge-discharge tests, making it a promising candidate for VRFB applications.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Materials Science, Coatings & Films
Edyta Kobierska, Stanislav Zak, Sabrina Hirn, Megan J. Cordill, Robert Franz, Marisa Rebelo de Figueiredo
Summary: In this study, the tribological properties of Mo films deposited on polyimide substrates were assessed using the ball-on-disc test. The wear mechanisms and induced stresses were analyzed by microscopy and simulation, providing insights into the tribological response of metallic films on compliant substrates.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Mitsuo Hara, Ryota Oguri, Shingo Sarkar, Shusaku Nagano, Takahiro Seki
Summary: We propose a simple technique to fabricate a uniform nanodot array of titanium dioxide by controlling the calcination temperature and mixing with a thermotropic liquid crystalline amphiphilic block copolymer, resulting in dot arrays with more uniform particle size.
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN
(2022)
Article
Biochemistry & Molecular Biology
Mina Han, Ikue Abe, Jihun Oh, Jaehoon Jung, Young Ji Son, Jaegeun Noh, Mitsuo Hara, Takahiro Seki
Summary: Fluorescent molecular assembly systems offer an exciting platform for creating stimuli-responsive nano- and microstructured materials with optical, electronic, and sensing functions. The relationship between molecular structures, spectroscopic features, and self-assembled structures depends on the solvent polarity. By selecting appropriate organic dyes, solvents, and light conditions, reusable fluorescent materials can be developed.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Polymer Science
Lipeng Zhai, Yuze Yao, Baiwei Ma, Md Mahmudul Hasan, Yuxi Han, Liwei Mi, Yuki Nagao, Zhongping Li
Summary: Covalent organic frameworks (COFs) are novel crystalline porous polymers with added sulfonic acid groups exhibiting excellent proton conductivity at 25 degrees Celsius and 95% relative humidity, presenting a new avenue for the design of high proton-conducting electrolytes.
MACROMOLECULAR RAPID COMMUNICATIONS
(2022)
Article
Chemistry, Analytical
Md. Fahamidul Islam, Md. Tarikul Islam, Md. Mahmudul Hasan, Mohammed M. Rahman, Yuki Nagao, Mohammad A. Hasnat
Summary: In this study, the incorporation of Ni particles into the porous Nafion bed significantly improved the stability of the sensor for hydrogen peroxide detection. The oxidative pathway of hydrogen peroxide on the GCE/Nafion/Ni electrode was investigated, and the sensor's performance was evaluated with a linear detection limit and dynamic range.
Article
Physics, Applied
Md. Mahmudul Hasan, Zhongping Li, Yuki Nagao
Summary: Ascorbic acid (vitamin C) is considered as a viable alternative fuel for alkaline direct liquid fuel cells. Palladium nanoparticles (Pd NPs) were incorporated into reduced graphene oxide (rGO) and multiwall carbon nanotube (MWCNT) hybrid nanocomposite (Pd/rGO/MWCNT) through a chemical reduction method for electrooxidation of ascorbic acid (AA) in the alkaline condition. The Pd/rGO/MWCNT modified glassy carbon electrode (Pd/rGO/MWCNT/GCE) exhibited the highest current density of 5.18 mA cm(-2) for AA electrooxidation, much higher than a bare glassy carbon electrode (0.6 mA cm(-2)). Pd/rGO/MWCNT/GCE also demonstrated excellent stability for AA oxidation in the alkaline condition.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Chikara Kawakami, Mitsuo Hara, Shusaku Nagano, Takahiro Seki
Summary: The orientation of liquid crystal (LC) molecules is greatly influenced by solid interfaces and free surfaces, leading to the development of various functional materials. This study successfully observed the induction of higher ordered LC phases at the interface between a side-chain LC azobenzene polymer film and a low-molecular-mass nematic LC. The induction process involved three stages of dynamic structure evolutions and was revealed to be driven by weak electron transfer immediately after interfacial contact.
Article
Polymer Science
Naoki Hida, Tatsunaga Nakajima, Mitsuo Hara, Takahiro Seki, Shusaku Nagano
Summary: Two liquid crystalline polymers with azobenzene or cyanobiphenyl mesogenic side chains were mechanically mixed in equal proportions, resulting in a compatible polymer blend and a highly ordered liquid crystal phase.
MACROMOLECULAR RAPID COMMUNICATIONS
(2023)
Article
Crystallography
Mitsuo Hara, Ayaka Masuda, Shusaku Nagano, Takahiro Seki
Summary: Photoalignment technology allows for the alignment of liquid crystalline molecules and their aggregates using polarized light. It is widely used in the fabrication of display panels and the creation of anisotropic materials. In this study, the photoalignment and photo-fixation of the chromonic liquid crystal BY columnar phase is proposed using UV-curable ionic polysiloxane. The orientation of the columnar phase is retained even after prolonged exposure to a humid environment.
Article
Chemistry, Multidisciplinary
Yuki Nagao, Yuze Yao, Hayato Watanabe, Mitsuo Hara, Shusaku Nagano
Summary: In this study, a new sulfonated semialicyclic oligoimide was synthesized to investigate the influence of molecular organized structure and proton conductivity with lower molecular weight. The thin film exhibited a high conductivity under humidified conditions.
Article
Chemistry, Multidisciplinary
Manjit Grewal, Kosuke Ishibashi, Mitsuo Hara, Yuya Ishizaki, Shusaku Nagano, Hiroshi Yabu
Summary: To achieve safe and high-performance Li-ion batteries, it is crucial to develop electrolytes with high impact resistance and high ionic conductivity. The use of poly(ethylene glycol) diacrylate (PEGDA) to form 3D networks and solvated ionic liquids has improved the ionic conductivity at room temperature. However, the effects of PEGDA's molecular weight on ionic conductivities and the relationship between ionic conductivities and network structures of cross-linked polymer electrolytes have not been thoroughly discussed.
Article
Chemistry, Multidisciplinary
Daiki Miyake, Jialei He, Fumio Asai, Mitsuo Hara, Takahiro Seki, Shin-nosuke Nishimura, Masaru Tanaka, Yukikazu Takeoka
Summary: In this study, the researchers discovered composite elastomers consisting of SiO2 particles dispersed in an acrylic polymer network that exhibit optical transparency, bright structural colors, and high mechanical toughness. This new type of elastomer has great potential for various applications.
Article
Chemistry, Multidisciplinary
Md. Fahamidul Islam, Jahir Ahmed, M. Faisal, Jari S. Algethami, Kentaro Aoki, Yuki Nagao, Farid A. Harraz, Mohammad A. Hasnat
Summary: This study investigated the performance of an iridium-oxide-layer-deposited platinum surface as a catalyst for ethanol oxidation reaction in an alkaline medium. Results showed that while the pure platinum catalyst exhibited higher activity towards EtOR compared to IrOx-Pt, the latter had better CO tolerance and stability. The cyclic voltammetry analysis indicated that the electrode reaction was limited by mass transfer.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Mizuki Ohke, Ryoichi Akaishi, Kyoka Tachibana, Michinari Kohri, Shusaku Nagano, Hinako Ebe, Jun Matsui
Summary: This study reports a simple method for preparing Janus metallic films by chemically depositing silver on poly(dopamine acrylamide). The simplified fabrication process enables widespread use of these films as decorative or authentication materials.