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Study on triphase of polymorphs TiO2 (anatase/rutile/brookite) for boosting photocatalytic activity of metformin degradation

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Chemosphere 2024年 351卷

作者： Eddy, Diana Rakhmawaty Nur Sheha, Geometry Amal Permana, Muhamad Diki Saito, Norio Takei, Takahiro Kumada, Nobuhiro Irkham Rahayu, Iman Abe, Ikki Sekine, Yuta Oyumi, Tomoki Izumi, Yasuo Department of Chemistry Faculty Mathematics and Natural Sciences Universitas Padjadjaran Sumedang45363 Indonesia Special Educational Program for Green Energy Conversion Science and Technology Integrated Graduate School of Medicine Engineering and Agricultural Sciences University of Yamanashi Kofu400-8511 Japan Center for Crystal Science and Technology University of Yamanashi Kofu400-8511 Japan Department of Chemistry Graduate School of Science Chiba University Chiba263-8522 Japan

The elution of pharmaceutical products such as metformin at higher concentrations than the safe level in aquatic systems is a serious threat to human health and the ecosystem. Photocatalytic technology using TiO2 semiconductors potentially fixes this problem. This study aims to synthesize triphasic anatase–rutile–brookite TiO2 using ultrasound assisted sol–gel technique in the presence of acid and its application to photodegradation of metformin under UV light irradiation. Based on X-ray diffraction analysis, a TiO2 sample consisted of anatase (76%), rutile (7%), and brookite (17%) polymorph (A76R7B17) that was fully crystallized. Scanning electron microscopy (EM)–energy dispersive X-ray spectra results showed agglomerated triphasic A76R7B17 with irregular spherical clusters. Transmission EM results revealed that the crystal size of A76R7B17 was 4–14 nm. The Brunauer–Emmett–Teller analysis showed the sample's specific surface area of 149 m2 g−1. The degradation test of metformin demonstrated that the A76R7B17 exhibited a 75.4% degradation efficiency after 120 min under UV light irradiation, significantly higher than using biphasic and single-phase TiO2 photocatalysts. This difference could be attributed to the heterojunction effect of triphasic materials that effectively reduced electron–hole recombination rate as well as the combination of effective electron transfer from conduction band of brookite and anatase and the utilization of wider range of UV–visible light using rutile. © 2024 Elsevier Ltd

关键词： Titanium dioxide

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Adsorption evaluation of linear alkylbenzene sulfonate on magadiite-magnetite and carbon-magnetite from rice husk ash

Case Studies in Chemical and Environmental Engineering

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Case Studies in Chemical and Environmental engineering 2025年 11卷

作者： Yuliana, Yuliana Permana, Muhamad Diki Solihudin Eddy, Diana Rakhmawaty Saito, Norio Takei, Takahiro Department of Chemistry Faculty Mathematics and Natural Sciences Universitas Padjadjaran Sumedang 45363 Indonesia Special Educational Program for Green Energy Conversion Science and Technology Integrated Graduate School of Medicine Engineering and Agricultural Sciences University of Yamanashi Kofu 400-8511 Japan Center for Crystal Science and Technology University of Yamanashi Kofu 400-8511 Japan

The presence of surfactant waste in the aquatic environment contributes to environmental problems. In this study, the adsorption that uses magadiite and carbon from rice husk ash via the microwave irradiation method and is composited with magnetite was proposed. The composite magadiite-magnetite (MM) and carbon-magnetite (CM) were obtained by co-precipitation methods by intercalation and impregnation. MM and CM were evaluated as adsorbents for the removal of the anionic surfactant linear alkylbenzene sulfonate (LABS). The obtained material was characterized by X-ray diffraction (XRD), Fourier-transform infrared (FTIR), scanning electron microscope-energy dispersive X-ray spectroscopy (SEM-EDX), thermal gravimetric analysis (TGA), N₂ adsorption by Brunauer-Emmet-Teller (BET) method, and vibrating sample magnetometer (VSM). The influence of contact time, initial concentration, temperature, pH, and adsorbent dose on the adsorption process was investigated. The adsorption kinetics of LABS onto MM and CM followed the pseudo-second-order model and the equilibrium data fitted well to the monolayer Langmuir model as confirmed by the calculated values of R². The adsorption capacity for LABS on MM and CM is 129.00 and 91.77 mg g⁻¹, respectively. The thermodynamic study exhibited that those adsorptions occurred spontaneously with a predominance of chemisorption. MM and CM could be utilized as effective adsorbents with retrieval ability for removing anionic surfactant pollutants in aquatic environments. © 2025 The Authors

关键词： Adsorption Carbon Linear alkylbenzene sulfonate Magadiite Magnetite

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Critical Parameters in Controlling Dislocation Nucleation at Twisted Semicoherent Interfaces

SSRN

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SSRN 2025年

作者： Zhang, Y. Kong, X.F. Yao, Bonan N. Liu, Zhaorui R. Legut, Dominik Zhang, R.F. School of Material Science and Engineering Beihang University Beijing100191 China Center for Integrated Computational Materials Engineering International Research Institute for Multidisciplinary Science Key Laboratory of High-Temperature Structural Materials & Coatings Technology Ministry of Industry and Information Technology Beihang University Beijing100191 China IT4Innovations VSB-Technical University of Ostrava 17. listopadu 2172/15 OstravaCZ-70800 Czech Republic Department of Condensed Matter Physics Faculty of Mathematics and Physics Charles University Ke Karlovu 3 Prague 2121 16 Czech Republic

Hetero-phase interfaces typically accommodate misfit dislocations, which dominate the interface-facilitated plasticity. Despite advancements in understanding such plasticity, the complexity of interface degrees of freedom has overshadowed the exploration of related dependent parameters. In this study, we present a novel investigation to systematically analyze critical parameters influencing dislocation nucleation at semicoherent interfaces by twisting one phase against the other. Our results reveal variations in critical nucleation stress with node distance, line-orientation misalignment, and spiral/straight patterns. To quantify these correlations semi-quantitatively, we propose Orowan and misalignment descriptors that incorporate the effect of node distance and the combined influence of line-orientation misalignment and spiral/straight patterns. These descriptors determine transitions from Friedel-Escaig-like to partially aligned, fully aligned, and misaligned Fleischer-like cross-slip mechanisms. These findings establish a clear structure-property relationship at hetero-phase interfaces and enable high-performance alloy design through interface engineering. © 2025, The Authors. All rights reserved.

关键词： Degrees of freedom (mechanics)

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Interpersonal coordination mechanism via assistive hold in ballroom dancing

Interpersonal coordination mechanism via assistive hold in b...

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SICE Annual Conference

作者： Akira Fukuhara Rinta Akimoto Takeshi Kano Ryo Kobayashi Yuji Yamamoto Akifumi Kijima Keiko Yokoyama Akio Ishiguro Research Institute of Electrical Communication Miyagi Japan Department of Electrical Engineering Graduate School of Engineering Tohoku University Miyagi Japan Program of Mathematical and Life Sciences Graduate School of Integrated Sciences for Life Hiroshima University Hiroshima Japan Department of Psychological Sciences Niigata University of Health and Welfare Niigata Japan Faculty of Education University of Yamanashi Yamanashi Japan Research Center of Health Physical Fitness and Sports Nagoya University Aichi Japan

This study investigates the control mechanisms underlying interpersonal coordination in ballroom dancing. We propose an agent-pair model, to understand the mechanism, that the number of steps increases when dancers dance in pairs compared to when they dance solo, that is, the pair-assist effect. In the proposed model, the agents support each other through holds on their arms, enabling them to take back-arched body postures that allow the agents to realize larger leg strides, which would result in instability if the agents danced alone. Furthermore, each agent adjusts its leg motion based on the compressive force generated by the hold, thereby generating a cooperative motion that suppresses the variation in the hold force due to discrepancies between agents. Simulation results suggest that decentralized motion coordination based on the load via the hold between agents is important in cooperative movements that involve physical contact, as observed in ballroom dancing.

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The influence of calcium chloride and potassium chloride cross-linking agent on the physical properties of chitosan-carrageenan composite film

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AIP Conference Proceedings 2023年第1期2667卷

作者： Nur Rokhati Farida D. Hapsari Aji Prasetyaningrum 1Department of Chemical Engineering Faculty of Engineering Universitas Diponegoro Semarang Indonesia 2Membrane Research Center (MeR-C) Integrated Laboratory for Research and Services Universitas Diponegoro Semarang Indonesia 3Master of Chemical Engineering Study Program Department of Chemical Engineering Faculty of Engineering Universitas Diponegoro Semarang Indonesia

Carrageenan is a sulfated polysaccharide that demonstrates excellent film-forming properties. In contrast, many hydroxyl and sulfate groups in their structures produce a carrageenan film highly hydrophilic and demonstrate comparatively poor mechanical. Therefore, it is necessary to blend Carrageenan with other biopolymers to improve the film's mechanical properties. This paper aims to study the characterization of the composite film by combining ĸ Carrageenan and Chitosan using CaCl2 and KCl cross-link agents. The composite film product was characterized by measuring its moisture content, solubility, swelling degree, water vapour permeability, oxygen permeability, Fourier Transform Infrared Spectroscopy (FTIR), and Scanning Electron Microscopy (SEM). The result shows that the addition of Chitosan could improve the properties of ĸ carrageenan film. CaCl2 and KCl cross-link agents reduce moisture content, swelling, solubility, water vapour permeability, and oxygen permeability of uncrosslinked film, which is suitable for food packaging.

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An Efficient Method for Automated Regression Test Data Generation for C/C++ Projects

An Efficient Method for Automated Regression Test Data Gener...

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National Foundation for Science and Technology Development Conference on Information and Computer Science (NICS)

作者： Hoang-Viet Tran Pham Ngoc Hung Center of Multidisciplinary Integrated Technologies for Field Monitoring (FIMO) University of Engineering and Technology Vietnam National University Hanoi E3 building 144 Xuan Thuy Cau Giay Hanoi Vietnam Faculty of Information Technology University of Engineering and Technology Vietnam National University Hanoi E3 building 144 Xuan Thuy Cau Giay Hanoi Vietnam

ISBN: (纸本)9781665410021

Regression test is a well-known method to ensure that both unchanged and evolved functions of the evolving software are in good quality. This is known to be an expensive task even with automated test data generation methods. For this reason, this paper proposes an effective method to maintain and reuse the test data generation results from previous versions for regression test of the evolved version. The key idea of the proposed method is that for unchanged units, we can reuse the whole previous test data. For evolved units, we reuse as many as possible the solutions of the unchanged test path constraints and generate new test data for only the new or updated test path constraints. The analysis shows that the proposed method has a high potential of applicability in regression test of C/C++ projects in practice. We give discussions about several evolving scenarios of a given unit and how the proposed method comes to effective in such scenarios.

关键词： Computer science Dictionaries Codes Memory management Software Task analysis Testing

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Graphene MEMS and NEMS

arXiv

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arXiv 2024年

作者： Fan, Xuge He, Chang Ding, Jie Gao, Qiang Ma, Hongliang Lemme, Max C. Zhang, Wendong Advanced Research Institute of Multidisciplinary Sciences Beijing Institute of Technology Beijing100081 China Center for Interdisciplinary Science of Optical Quantum and NEMS Integration Beijing Institute of Technology Beijing100081 China School of Integrated Circuits and Electronics Beijing Institute of Technology Beijing100081 China Faculty of Electrical Engineering and Information Technology RWTH Aachen University Otto-Blumenthal-Str. 25 Aachen52074 Germany AMO GmbH Otto-Blumenthal-Str. 25 Aachen52074 Germany State Key Laboratory of Dynamic Measurement Technology North University of China Taiyuan030051 China National Key Laboratory for Electronic Measurement Technology School of Instrument and Electronics North University of China Taiyuan030051 China

Graphene is being increasingly used as an interesting transducer membrane in micro- and nanoelectromechanical systems (MEMS and NEMS, respectively) due to its atomical thickness, extremely high carrier mobility, high mechanical strength and piezoresistive electromechanical transductions. NEMS devices based on graphene feature increased sensitivity, reduced size, and new functionalities. In this review, we discuss the merits of graphene as a functional material for MEMS and NEMS, the related properties of graphene, the transduction mechanisms of graphene MEMS and NEMS, typical transfer methods for integrating graphene with MEMS substrates, methods for fabricating suspended graphene, and graphene patterning and electrical contact. Consequently, we provide an overview of devices based on suspended and nonsuspended graphene structures. Finally, we discuss the potential and challenges of applications of graphene in MEMS and NEMS. Owing to its unique features, graphene is a promising material for emerging MEMS, NEMS and sensor applications. © 2024, CC BY-NC-SA.

关键词： Graphene devices

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Dietary carbohydrates alter immune-modulatory functionalities and DNA inversions in Bacteroides thetaiotaomicron

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Nature Communications 2025年第1期16卷 1-19页

作者： Gal-Mandelbaum, Noa Carasso, Shaqed Kedem, Alon Ziv, Tamar Keshet-David, Roni Abboud, Roberto Zaatry, Rawan Gefen, Tal Geva-Zatorsky, Naama Department of Cell Biology and Cancer Science Rappaport Faculty of Medicine and Research Institute Rappaport Technion Integrated Cancer Center (RTICC) Technion-Israel Institute of Technology Haifa Israel Smoler Proteomics Center Lokey Interdisciplinary Center for Life Sciences & Engineering Technion-Israel Institute of Technology Haifa Israel CIFAR Humans & the Microbiome program CIFAR Toronto Canada

The gut bacteria environment is highly dynamic. Environmental conditions were shown to affect microbial composition. Yet, their influences on bacterial functionality (e.g., immune-modulation activity) are mostly overlooked. Distinct strains of the same species, and even the same bacterial strain, may have different effects on the immune system depending on their growth environment. Therefore, studying the functionality of strains under different conditions is crucial. We analyzed functional alterations in the gut symbiont Bacteroides thetaiotaomicron (B. theta) under different dietary components consumption in humans, upon white sugar consumption in mice, and in response to 190 different carbon sources in vitro. Dietary alterations affected the orientation of phase variable regions in B. theta in humans, in vivo, and in vitro, and altered B. theta’s proteome and immune-modulatory functionality. Studying the effects of dietary components on the immune-modulatory functionalities of key members of the gut microbiota will allow for personalized dietary recommendations. © The Author(s) 2025.

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Field-Induced Criticality in YbCu4Au

arXiv

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arXiv 2024年

作者： Taniguchi, Takanori Osato, Kotaro Okabe, Hirotaka Kitazawa, Takafumi Kawamata, Masahiro Hashimoto, Shota Ikeda, Yoichi Nambu, Yusuke Sari, Dita Puspita Watanabe, Isao Nakamura, Jumpei G. Koda, Akihiro Gouchi, Jun Uwatoko, Yoshiya Kittaka, Shunichiro Sakakibara, Toshiro Mizumaki, Masaichiro Kawamura, Naomi Yamanaka, Takayoshi Hiraki, Koichi Sasaki, Takahiko Fujita, Masaki Institute for Materials Research Tohoku University Sendai980-8577 Japan Department of Physics Tohoku University Sendai980-8578 Japan Organization for Advanced Studies Tohoku University Sendai980-8577 Japan FOREST Japan Science and Technology Agency Kawaguchi Saitama332-0012 Japan Innovative Global Program College of Engineering Shibaura Institute of Technology Saitama337-8570 Japan Nuclear Structure Research Group Nishina Center for Accelerator-Based Science RIKEN Wako Saitama351-0198 Japan Institute of Materials Structure Science High-Energy Accelerator Research Organization Tsukuba305-0801 Japan The Institute for Solid State Physics The University of Tokyo Kashiwa Chiba277-8581 Japan Department of Physics Faculty of Science and Engineering Chuo University Tokyo112-8551 Japan Faculty of Science Kumamoto University 2-39-1 Kurokami Chuou-ku Kumamoto860-8555 Japan Japan Synchrotron Radiation Research Institute Sayo Hyogo679-5148 Japan Integrated Center for Science and Humanities Fukushima Medical University Fukushima960-1295 Japan

YbCu4Au is a unique material exhibiting multiple quantum fluctuations simultaneously. In this study, we investigated the field-induced criticality in YbCu4Au, based on comprehensive micro and macro measurements, including powder Xray diffraction (XRD), neutron powder diffraction (NPD), nuclear magnetic resonance, magnetization, resistivity, specific heat, muon spin rotation relaxation (μSR), and X-ray absorption spectroscopy (XAS). Single crystals of YbCu4Au were grown, and their crystal structure was determined using XRD, and NPD measurements. Magnetic successive transitions were observed below 1 T by specific heat, resistivity, NPD, and μSR measurements. XAS measurements further indicate that the valence of Yb ions (+2.93) remained unchanged above 2 T. Moreover, the change in quadrupole frequency observed in the previous study is attributable to the electric quadrupole, as the expected value of the electric quadrupole was finite under magnetic fields [S. Wada et al., Journal o f Physics: Condensed Matter, 20, 175201 (2008).]. These experimental results suggest that YbCu4Au exhibited bicritical behavior near 1 T, arising from the competition between RKKY interaction, accounting for the magnetic phases, and the Zeeman effect. © 2024, CC BY-NC-SA.

关键词： X ray absorption spectroscopy

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The synergistic effect of Fe3O4/g-C3N4 for persulfate activation in sulfate radical photo-Fenton

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Colloids and Surfaces A: Physicochemical and engineering Aspects 2025年 720卷

作者： Permana, Muhamad Diki Takei, Takahiro Khatun, Anjuman Ara Saito, Norio Eddy, Diana Rakhmawaty Kumada, Nobuhiro Center for Crystal Science and Technology University of Yamanashi Kofu400-8511 Japan Special Educational Program for Green Energy Conversion Science and Technology Integrated Graduate School of Medicine Engineering and Agricultural Sciences University of Yamanashi Kofu4008511 Japan Department of Chemistry Faculty Mathematics and Natural Sciences Universitas Padjadjaran Sumedang45363 Indonesia

The Fe3O4/g-C3N4 composite has been successfully synthesized using coprecipitation method. The light absorption capabilities of g-C3N4 and Fe3O4 demonstrate synergistic effect in activating persulfate (PS). This synergistic effect occurs at Fe3O4 loading of 22–35 mass%, which has the effectiveness of hole-electron separation. The Fe−N coordination bonds were present, reflecting the interfacial chemical interactions between g-C3N4 and Fe3O4. The PS-activated Fe3O4/g-C3N4 system can completely degrade methyl orange (MO) in 15 min under visible light illumination (λ > 420 nm). Radical scavenging experiments show that SO4•−, •OH, •O2−, and h+ play a role in the degradation of organic pollutants. Other organic pollutants, such as methylene blue, rhodamine B, crystal violet, and phenol were also successfully degraded, indicating that this system has strong non-selective oxidative capabilities. Therefore, the Fe3O4/g-C3N4/PS system has high photocatalytic activity, high magnetic properties and stability, and potential for application in the water treatment of organic pollutants. © 2025 The Authors

关键词： Hematite

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