Article
Materials Science, Ceramics
Sara Ahmadi, Bijan Eftekhari Yekta, Hossein Sarpoolaky, Alireza Aghaei
Summary: Monolithic transparent mullite-based glass ceramics were successfully prepared using the sol-gel method in the SiO2-Al2O3-B2O3-ZnO-K2O system. The heat treatment at 950 degrees C for 6 hours resulted in dense, homogeneous and transparent glass ceramics. Characterization using various techniques revealed a mullite precipitation volume of 34% and a visible light transmittance of about 79% in the samples.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2022)
Article
Materials Science, Multidisciplinary
Jiang-Yuan Qiu, Hua-Zhang Feng, Zhao-Hui Chen, Shu-Hong Ruan, Yan-Ping Chen, Ting-Ting Xu, Jing-Yun Su, En-Na Ha, Lu-Yang Wang
Summary: Defect engineering significantly enhances the catalytic activity of transition metal semiconductor photocatalysts. This study reports a facile solution processing strategy to generate localized defects on the surface of anatase TiO2 nanosheets, resulting in outstanding photocatalytic hydrogen production rates. This defect engineering strategy provides new insights for defect engineering and semiconductor photocatalysts.
Article
Chemistry, Multidisciplinary
Yuqian Yu, Li Kang, Lixian Sun, Fen Xu, Hongge Pan, Zhen Sang, Chenchen Zhang, Xinlei Jia, Qingli Sui, Yiting Bu, Dan Cai, Yongpeng Xia, Kexiang Zhang, Bin Li
Summary: In this study, a porous titanium oxide cage (PTOC) catalyst was successfully synthesized, and its synergistic effect with PtNi alloy particles resulted in a high hydrogen generation rate and low activation energy. The robust porous structure of PTOC effectively prevented agglomeration issues and ensured the long-term stability of the catalyst.
Article
Multidisciplinary Sciences
Adrian Angulo-Ibanez, Amaia M. Goitandia, Jonathan Albo, Estibaliz Aranzabe, Garikoitz Beobide, Oscar Castillo, Sonia Perez-Yanez
Summary: By developing a durable photocatalytic window with an inner SiO2 layer and an outer mesoporous anatase layer on a glass substrate, it can act in the photocatalytic transformation of CO2 to methanol. This design saves photoactive material while maintaining robustness to prevent performance decay during long working periods.
Article
Materials Science, Ceramics
Hongyu Yang, Liang Chai, Yuchen Wang, Mengjiang Xing, Yawei Chen, Enzhu Li
Summary: This study proposes a simple, repeatable, and efficient design for characterizing the dissolution behaviors of titanium-based ceramics in glass frits under variable temperature conditions. The study also emphasizes that the dissolution characteristics of ceramics in the glass should be seriously considered, rather than just relying on the wettability of the glass frit.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Physical
Hongying Li, Bicheng Zhu, Jian Sun, Haiming Gong, Jiaguo Yu, Liuyang Zhang
Summary: Compared to hydrogen production through pure water photocatalysis, utilizing seawater directly for hydrogen production is more in line with the principles of sustainable development. RuO2 and TiO2 have been widely recognized to exhibit good stability in seawater. This study investigates hydrogen production in simulated seawater using a RuO2-modified TiO2 model system. The results show that the hydrogen production activity of TiO2/RuO2 nanofibers in simulated seawater is comparable to that in pure water.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2024)
Article
Chemistry, Physical
Amit Kumar Verma, Prerna Tripathi, Akash Dubey, Niraj Kumar Vishwakarma, A. S. K. Sinha, Shikha Singh
Summary: This article describes a study on hydrogen generation from aqueous methanol over a TiO2 up-conversion (CeF3:Ho3+) nanosystem (CHT) under visible light irradiance. CeF3:Ho3+ nanoparticles (about 4 to 8 nm) were synthesized and incorporated into TiO2 using a simple polyol reduction method. The successful formation of a CeF3:Ho3+-incorporated TiO2 nanosystem was confirmed through various characterizations. The results showed that the CeF3:Ho3+-incorporated TiO2 nanosystem exhibited enhanced photocatalytic activity and could be used as an effective photocatalyst for sustainable hydrogen generation under visible light irradiance.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Omar Faye, Inimfon A. Udoetok, Jerzy A. Szpunar, Lee D. Wilson
Summary: Theoretical and experimental studies were conducted on hydrogen generation through the hydrolysis of graphene oxide functionalized with magnesium, titanium, and niobium. Results show that niobium and titanium functionalized graphene oxide exhibit promising potential for on-board H-2 generation applications, with GONb producing the highest H2 yield. MgO, TiO2, and NbO2 layers were formed on the GO surface, impacting the hydrolysis process.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Materials Science, Ceramics
P. Jineesh, Aslam Hossain, R. Remya, J. N. Sebeelamol, Rajesh Kumar Manavalan, Jahangeer Ahmed, Mohaseen S. Tamboli, S. M. A. Shibli
Summary: This study focuses on enhancing hydrogen generation in a powder-type complex photocatalytic system using different proton sources. By optimizing reaction conditions, tuning pH, and adding appropriate sacrificial agents, the efficiency of hydrogen production has been enhanced. The use of low-cost iron-based nanomaterials allows for eco-friendly hydrogen generation, and the system has additional advantages such as low cost, easy preparation, high stability, and non-toxicity.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Dinh Trinh Tran, Tap Huu Van, Yu-chih Tsai, Kun-Yi Andrew Lin, Tuan Dinh Duong
Summary: This study reports the design and fabrication of a cobalt-based catalyst for the hydrolysis of sodium borohydride (NaBH4), which shows excellent catalytic activity and stability. The hierarchical porous hollow core-shell framework cobalt oxide (HCSCO) catalyst exhibits a high H-2 generation rate and a low activation energy. Compared to other catalysts, HCSCO demonstrates superior performance. This research provides a valuable strategy for the synthesis and fabrication of efficient catalysts.
Review
Chemistry, Physical
Yuhao Liu, Xinlong Zheng, Yingjie Yang, Jing Li, Weifeng Liu, Yijun Shen, Xinlong Tian
Summary: This review article summarizes the development and application of TMS/TiO2 heterojunction photocatalysts, including their characteristics, properties, and advantages, and discusses the factors influencing photocatalytic hydrogen evolution process.
Article
Thermodynamics
Miroslava Edelmannova, Maria de los Milagros Ballari, Michal Pribyl, Kamila Koci
Summary: This study aims to explore the efficiency of photocatalytic hydrogen production by formulating a phenomenological model, and it reveals that the mass transfer of hydrogen significantly influences the dynamics of the photoreactor. Additionally, experimental results indicate the critical roles of photocatalyst concentration and mass transfer in further research and optimization of photocatalytic reactors for hydrogen production in the future.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Nanoscience & Nanotechnology
Yong Zhang, Yang Xia, Linxi Wang, Bei Cheng, Jiaguo Yu
Summary: In this study, flower-like hierarchical ZnO microspheres were prepared by hydrothermal method followed by calcination at different temperatures, and their performance in H2O2 production was examined under simulated sunlight irradiation. The ZnO calcined at 300 degrees C exhibited the highest activity and optimal stability. Additionally, cycling experiments indicated good stability and long-term performance of the prepared ZnO samples.
Article
Chemistry, Multidisciplinary
Fusheng Li, Shuangjie Lin, Yuqing Chen, Caizhe Shi, Huaipu Yan, Chenchen Li, Chao Wu, Luqing Lin, Chunying Duan, Lei Shi
Summary: This study reports a novel photocatalytic strategy for the generation of pi-allyltitanium complexes, allowing for the rapid access to valuable homoallylic alcohols through a three-component allylation reaction with 1,3-butadiene and carbonyls. The exceptional regio- and diastereoselectivity provided by dual photoredox/Ti catalysis is comparable to that of the Cr-catalyzed Nozaki-Hiyama-Kishi allylation reaction.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Materials Science, Ceramics
Chirag Porwal, Akshay Gaur, Vishal Singh Chauhan, Rahul Vaish
Summary: This study assesses the efficacy of a lithium borate-bismuth tungstate glass-ceramic material in degrading methylene blue dye under visible light irradiation conditions. The glass-ceramic sample achieved a dye degradation efficiency of 73% within a time span of 240 min.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Hirokazu Masai, Yasuhiro Fujii, Naoyuki Kitamura, Masato Yamawaki
Summary: This study examines the relationship between the elastic modulus of glasses and structural parameters, including the correlation length of the Boson peak and cavity size, as well as the correlation with the longitudinal and transversal sound velocities and thermal stability parameters. The results show that the glasses in the GeO2-rich region exhibit a plateau behavior in the Boson peak frequencies, indicating a similarity in the rate of change in sound velocity and correlation length.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2022)
Article
Spectroscopy
Junlan Zhong, Shin Nakagawa, Karolina Kaczmarska, Wakana Terao, Beata Grabowska, Yasuhiro Fujii, Akitoshi Koreeda, Shinji Kohara, Hisanori Tanimoto, Hiroko Tokoro, Shin-Ichi Ohkoshi, Jae-Hyeon Ko, Yu Duan, Tatsuya Mori
Summary: The vibrational density of states of CM-starch was investigated by THz time-domain spectroscopy, showing similarities to glucose-based polymer glasses. The BP frequency showed almost no dependence on temperature, while the chain length of the glass affected the BP frequency.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Physics, Applied
Eiichi Oishi, Yasuhiro Fujii, Akitoshi Koreeda, Takuya Satoh, Toshimitsu Ito
Summary: In this study, quasi-elastic light scattering (QELS) in BiFeO3 was observed using Raman spectroscopy over a temperature range of 300-860 K. The QELS exhibited two components: narrow and broad ones. The temperature dependence of the intensity and linewidth of the broad component differed below and beyond the Neel point, suggesting a possible magnetic origin of the broad QELS.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2022)
Article
Physics, Applied
Hirokazu Masai, Takayuki Yanagida
Summary: This paper summarizes recent studies on glass-based scintillators and discusses the prospects of glass-based scintillators based on the general relationships between scintillation and photoluminescence quantum efficiency in materials.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2023)
Article
Biochemistry & Molecular Biology
Hisao Masai
Summary: This article summarizes the recent progress in DNA replication and the evolution of replication systems. It provides detailed information about the proteins involved in the replication of host chromosomes and their mechanisms of action. Additionally, it discusses the alternative modes of initiation in prokaryotes and eukaryotes.
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
(2022)
Article
Biochemistry & Molecular Biology
Hao-Wen Hsiao, Chi-Chun Yang, Hisao Masai
Summary: It has been found that various biological stresses can activate Chk1, leading to DNA replication arrest and cell cycle alteration. Activation of Chk1 in S phase relies on Claspin, while in G1 phase it is mostly independent of Claspin. These findings reveal novel links between replication stress checkpoint and other biological stresses, and suggest the existence of replication-independent mechanisms of Chk1 activation in mammalian cells.
Article
Physics, Multidisciplinary
Shinya Tsukada, Yasuhiro Fujii, Akari Kanagawa, Yukikuni Akishige, Kenji Ohwada
Summary: Angle-resolved polarized Raman mapping was used to investigate the relationship between phase boundaries and giant dielectric responses in a relaxor-ferroelectric solid-solution system. The results showed that the observed giant dielectric response is attributable to the slowing down of a relaxation process related to mesoscopic ferroelectric domains near the phase boundary, which distinguishes relaxor ferroelectrics from other ferroelectrics.
COMMUNICATIONS PHYSICS
(2023)
Article
Biology
Yutaka Kanoh, Masaru Ueno, Motoshi Hayano, Satomi Kudo, Hisao Masai
Summary: Rif1 overexpression leads to nuclear relocation, growth inhibition, and cell death, affecting both the S and M phases of the cell cycle. Rif1 overexpression induces chromatin relocation near the nuclear periphery, which is potentially related to growth inhibition.
LIFE SCIENCE ALLIANCE
(2023)
Article
Cell Biology
Karin Hori, Satoshi Yamazaki, Chiaki Ohtaka-Maruyama, Tomio Ono, Tomohiro Iguchi, Hisao Masai
Summary: By using Nestin-Cre, we generated mice with Cdc7 knockout in neural stem cells, which displayed severe growth retardation and impaired postnatal brain development. Cerebral cortical layer formation was impaired, while cell numbers remained unchanged. In the hypoplastic cerebellum, granule cell numbers were reduced, indicating that Cdc7 is necessary for DNA replication and cell proliferation of granule cells during mid embryonic stage. These findings demonstrate differential roles of Cdc7 in brain DNA replication/cell proliferation and suggest a potential additional role in cell migration during neural development.
Article
Physics, Applied
Hiromu Ishida, Eiichi Oishi, Yasuhiro Fujii, Akitoshi Koreeda, Takuya Satoh, Toshimitsu Ito
Summary: We conducted Brillouin light scattering spectroscopy on a single crystal of BiFeO3 (BFO) and observed the scattering of LA and TA phonon modes along the c-axis at temperatures ranging from 110 to 300 K. The elastic constants for the LA and TA modes were determined to be approximately 251 GPa and 38.7-44.2 GPa, respectively, at 300 K. Unexpected splitting of the degenerate TA modes along the c-axis was observed, and anomalies such as softening of the LA mode and frequency drop of the TA mode around 210 K were also observed.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2023)
Correction
Biochemistry & Molecular Biology
Hao-Wen Hsiao, Chi-Chun Yang, Hisao Masai
Article
Biochemistry & Molecular Biology
Chi-Chun Yang, Hisao Masai
Summary: Claspin plays multiple important roles in DNA replication regulation, including mediating the cellular response to replication stress, facilitating replication fork progression, and promoting initiation by recruiting Cdc7 kinase. It is also found to be involved in growth recovery from serum starvation through the activation of the PI3K-PDK1-Akt-mTOR pathway. In the absence of Claspin, cells fail to enter S phase and eventually undergo partial death in a manner dependent on ROS and p53.
MOLECULAR AND CELLULAR BIOLOGY
(2023)
Article
Biotechnology & Applied Microbiology
Youichi Tajima, Futoshi Shibasaki, Hisao Masai
Summary: The study reveals that bladder cancer cells can undergo cell fusion with bone marrow-derived MSC, resulting in fusion cells with high tumorigenicity. Fusion cells exhibit genomic instability, increased cell proliferation, and enhanced tumor formation compared to parent cells. The altered gene expression and overexpression of cytokines in fusion cells provide insights into the mechanisms underlying cell fusion-mediated tumorigenesis. The study also highlights the potential of targeting PD-L1 and utilizing cancer immunotherapy for the treatment of bladder cancer.
CANCER GENE THERAPY
(2023)
Article
Materials Science, Ceramics
Kyoko Okada, Akihiko Kajinami, Fumiko Kugai, Seizou Obata, Aimi Kato, Yasuhiro Fujii, Akitoshi Koreeda, Norimasa Umesaki, Keizo Sato, Yoshiharu Sakurai
Summary: This study observed and analyzed the glass produced by the in-flight-melting method using multiple techniques. It discovered specific oxygen chemical states and unique fiber structures that differ from traditional glass and natural silicate glass.
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN
(2022)
