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Chemistry–Methods 2025年第4期5卷

作者： José Nuno Almeida Lu Song Sohrab Askarli Sang-Ho Chung Javier Ruiz-Martínez Catalysis Nanomaterials and Spectroscopy Group King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia Department of Carbon Neutrality Soonchunhyang University (SCH University) 22 Soonchunhyang-ro Sinchang-myeon Asan-si Chungcheongnam-do 31538 South Korea Chemical Engineering Program Physical Science and Engineering (PSE) Division King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia

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Mechanism of skyrmion condensation and pairing for twisted bi-layer graphene

arXiv

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arXiv 2021年

作者： Jing, Dian Tyner, Alexander Conkey Goswami, Pallab Department of Physics and Astronomy Northwestern University EvanstonIL60208 United States Department of Chemical and Biological Engineering Northwestern University EvanstonIL60208 United States Integrated Science Program Northwestern University EvanstonIL60208 United States Graduate Program in Applied Physics Northwestern University EvanstonIL60208 United States

When quantum flavor Hall insulator phases of itinerant fermions are disordered by strong quantum fluctuations, the condensation of skyrmion textures of order parameter fields can lead to superconductivity. In this work, we address the mechanism of skyrmion condensation by considering the scattering between (2+1)-dimensional, Weyl fermions and hedgehog type tunneling configurations of order parameters that violate the skyrmion-number conservation law. We show the quantized, flavor Hall conductivity (σxyf ) controls the degeneracy of topologically protected, fermion zero-modes, localized on hedgehogs, and the overlap between zero-mode eigenfunctions or't Hooft vertex determines the nature of pairing. We demonstrate the quantum-disordered, flavor Hall insulators with σxyf = 2N lead to different types of charge 2Ne− superconductivity. Some implications for the competition among flavor Hall insulators, the charge 2e− paired states in BCS and pair-density-wave channels, and the composite, charge 4e− superconductors for twisted bilayer graphene are outlined. © 2021, CC BY.

关键词： Condensation

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Enhancing the yield and quality of Kemiri Sunan crude oil by preliminary extraction of feedstock 3

Enhancing the yield and quality of Kemiri Sunan crude oil by...

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3rd International Conference on chemical and Material engineering, ICCME 2018

作者： Supriyadi, S. Purwanto, P.P. Hermawan, H. Doctoral Program of Environmental Science School of Postgraduate Studies Diponegoro University Semarang Indonesia Department of Mechanical Engineering Universitas PGRI Semarang Semarang Indonesia Department of Chemical Engineering Faculty of Engineering Diponegoro University Semarang Indonesia Department of Electrical Engineering Faculty of Engineering Diponegoro University Semarang Indonesia

Biodiesel is an alternative fuel produced by chemical reaction between vegetable oil or animal fat with alcohol and catalyst. The preliminary treatment in extraction of biodiesel feedstock is an important process to obtain maximum yield of crude oil. This study aims to find optimal preliminary treatment on extraction of Kemiri Sunan seed in order to produce crude oil with maximum yield and quality. The research investigated the effects of screw press machine rotation and duration of steaming process. Three levels of duration of steaming used were 30, 60 and 90 minutes. Observations of crude oil yield, moisture content, free fatty acid content, kinematic viscosity, density and color were done. The result suggested that the rotation of screw press machine affected the crude oil yield. The duration of steaming process affected the oil yield, free fatty acid content, kinematic viscosity, density and color. The best oil yield result of 70.3% was obtained from the combination of heating duration of 60' and screw rotation of 25 RPM. © 2019 Published under licence by IOP Publishing Ltd.

关键词： Biodiesel

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Self-Assembled Saccharide-Functionalized Amphiphilic Metallacycles as Biofilms Inhibitor via "sweet Talking"

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ACS Macro Letters 2020年第1期9卷 61-69页

作者： Tao, Guoqing Ji, Tan Wang, Ning Yang, Guang Lei, Xiaolai Zheng, Wei Liu, Rongying Xu, Xuyang Yang, Ling Yin, Guang-Qiang Liao, Xiaojuan Li, Xiaopeng Ding, Hong-Ming Ding, Xiaoming Xu, Jinfu Yang, Hai-Bo Chen, Guosong State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science Fudan University Shanghai 200433 China Shanghai Key Laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular Engineering East China Normal University Shanghai 200062 China Shanghai Pulmonary Hospital School of Medicine Tongji University Shanghai 200433 China Center for Soft Condensed Matter Physics and Interdisciplinary Research School of Physical Science and Technology Soochow University Suzhou 215006 China School of Life Sciences Fudan University Shanghai 200433 China Department of Chemistry University of South Florida Tampa 33620 FL United States Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development School of Chemistry and Molecular Engineering East China Normal University Shanghai 200062 China

Bacterial biofilms are troublesome in the treatment of bacterial infectious diseases due to their inherent resistance to antibiotic therapy. Exploration of alternative antibiofilm reagents provides opportunities to achieve highly effective treatments. Herein, we propose a strategy to employ self-assembled saccharide-functionalized amphiphilic metallacycles ([2+2]-Gal, [3+3]-Gal, and [6+6]-Gal) with multiple positive charges as a different type of antibacterial reagent, marrying saccharide functionalization that interact with bacteria via "sweet talking". These self-assembled glyco-metallacycles gave various nanostructures (nanoparticles, vesicles or micron-sized vesicles) with different biofilms inhibition effect on Staphylococcus aureus (S. aureus). Especially, the peculiar self-assembly mechanism, superior antibacterial effect and biofilms inhibition distinguished the [6+6]-Gal from other metallacycles. Meanwhile, in vivo S. aureus pneumonia animal model experiments suggested that [6+6]-Gal could relieve mice pneumonia aroused by S. aureus effectively. In addition, the control study of metallacycle [3+3]-EG₅ confirmed the significant role of galactoside both in the self-assembly process and the antibacterial efficacy. In view of the superior effect against bacteria, the saccharide-functionalized metallacycle could be a promising candidate as biofilms inhibitor or treatment agent for pneumonia. Copyright © 2019 American chemical Society.

关键词： Biofilms Self organization Vesicles Metallacycles Inhibition

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The growth of local microalgae in synthetic and agricultural wastewater for aquaculture feed application

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AIP Conference Proceedings 2023年第1期2682卷

作者： Jannatulhawa Jasni Nazlina Haiza Mohd Yasin Mohd Sobri Takriff 1Department of Chemical and Process Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia 43600 UKM Bangi Selangor Malaysia. 2Department of Biological Sciences and Biotechnology Faculty of Science and Technology Universiti Kebangsaan Malaysia 43600 UKM Bangi Selangor Malaysia 3Chemical and Water Desalination Program College of Engineering University of Sharjah United Arab Emirates.

Microalgae's high protein content makes them an attractive feedstock for aquaculture feed applications. However, an economical and effective mass cultivation is essential for greater feasibility in microalgal-based aquaculture applications. Therefore, in this research the utilization of wastewater for microalgal cultivation using two local species of Chlamydomonas sp. UKM6 and Scenedesmus sp. UKM9 were discussed with particular attention to the feasibility of utilizing POME as microalgal growth medium for the production of bulk biomass. The growth rate for Chlamydomonas sp. UKM6 and Scenedesmus sp. UKM9 grown in Bold's Basal Media (BBM) were found higher (0.2829, 0.4045 day-1) than in POME (0.160, 0.255 day-1). Their biomass were then applied as zooplankton enrichment feed for Daphnia magna and then subsequently for feeding fish larvae. The result shown that enriched Daphnia using Scenedesmus sp. UKM9 microalgae promotes better growth, survival and fecundity of fish larvae (P>0.05) than the control diet using dried yeast. Thus, this research indicating the feasibility of culturing microalgae using wastewater as a means to reduce the cost of production is possible and therefore can be applied in aquaculture feed industries.

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Negatively Curved Octagon-Incorporated Aza-nanographene and its Assembly with Fullerenes

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Angewandte Chemie 2024年第15期136卷

作者： Jun Liu Juan Hong Zhenxing Liao Dr. Jingyun Tan Haoliang Liu Dr. Evgenia Dmitrieva Long Zhou Dr. Jie Ren Prof. Xiao-Yu Cao Dr. Alexey A. Popov Prof. Yingping Zou Prof. Akimitsu Narita Prof. Yunbin Hu College of Chemistry and Chemical Engineering Central South University 410083 Changsha China These authors contributed equally to this work Organic and Carbon Nanomaterials Unit Okinawa Institute of Science and Technology Graduate University 1919-1 Tancha Onna-son Kunigami-gun Okinawa 904-0495 Japan Department of Chemistry and Chemical Engineering Xiamen University 361005 Xiamen China Center of Spectroelectrochemistry Leibniz Institute for Solid State and Materials Research Helmholtzstrasse 20 01069 Dresden Germany MOE Key Laboratory of Macromolecular Synthesis and Functionalization International Research Center for X Polymers Department of Polymer Science and Engineering Zhejiang University 310027 Hangzhou China

A negatively curved aza-nanographene (NG) containing two octagons was synthesized by a regioselective and stepwise cyclodehydrogenation procedure, in which a double aza[7]helicene was simultaneously formed as an intermediate. Their saddle-shaped structures with negative curvature were unambiguously confirmed by X-ray crystallography, thereby enabling the exploration of the structure–property relationship by photophysical, electrochemical and conformational studies. Moreover, the assembly of the octagon-embedded aza-NG with fullerenes was probed by fluorescence spectral titration, with record-high binding constants ( K a =9.5×10 3 M −1 with C 60 , K a =3.7×10 4 M −1 with C 70 ) found among reported negatively curved polycyclic aromatic compounds. The tight association of aza-NG with C 60 was further elucidated by X-ray diffraction analysis of their co-crystal, which showed the formation of a 1 : 1 complex with substantial concave-convex interactions.

关键词： Nanographenes Helicenes Negative Curvature Fullerene Hosts Chiroptical Properties

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A review manuscript submitted to Chemosphere advancement of green technologies: A comprehensive review on the potential application of microalgae biomass

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Chemosphere 2021年 281卷 130886-130886页

作者： Yap, Jiunn Kwok Sankaran, Revathy Chew, Kit Wayne Halimatul Munawaroh, Heli Siti Ho, Shih-Hsin Rajesh Banu, J. Show, Pau Loke State Key Laboratory of Urban Water Resource and Environment School of Environment Harbin Institute of Technology Harbin150090 China Department of Chemical and Environmental Engineering Faculty of Science and Engineering University of Nottingham Malaysia Jalan Broga SemenyihSelangor Darul Ehsan43500 Malaysia Graduate School University of Nottingham Malaysia Jalan Broga SemenyihSelangor Darul Ehsan43500 Malaysia School of Energy and Chemical Engineering Xiamen University Malaysia Jalan Sunsuria Bandar Sunsuria SepangSelangor Darul Ehsan43900 Malaysia Chemistry Program Department of Chemistry Education Universitas Pendidikan Indonesia Bandung Indonesia Department of Life Science Central University of Tamil Nadu Neelakudi ThiruvarurTamilnadu610005 India

Microalgae have drawn significant interest worldwide, owing to their enormous application potential in the green energy, biopharmaceutical, and nutraceutical industries. Many studies have proved and stated the potential of microalgae in the area of biofuel which is economically effective and environmentally friendly. Besides the commercial value, the potential of microalgae in environmental protection has also been investigated. Microalgae-based process is one of the most effective way to treat heavy metal pollution, compared to conventional methods, it does not release any toxic waste or harmful gases, and the aquatic organism will not receive any harmful effects. The potential dual role of microalge in phytoremedation and energy production has made it widely explored for its capability. The interest of microalgae in various application has motivated a new focus in green technologies. Considering the rapid population growth with the continuous increase on the global demand and the application of biomass in diverse field, significant upgrades have been performed to accommodate green technological advancement. In the past decade, noteworthy advancement has been made on the technology involving the diverse application of microalgae biomass. This review aims to explore on the application of microalgae and the development of green technology in various application for microalgae biomass. There is great prospects for researchers in this field to delve into other potential utilization of microalgae biomass not only for bioremediation process but also to generate revenues from microalgae by incorporating clean and green technology for long-term sustainability and environmental benefits. © 2021

关键词： Microalgae

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The critical role of electrochemically activated adsorbates in neutral OER

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science China Materials 2020年第12期63卷 2509-2516页

作者： Longsheng Zhang Haiyang Yuan Liping Wang Hui Zhang Yijing Zang Yao Tian Yunzhou Wen Fenglou Ni Hao Song Haifeng Wang Bo Zhang Huisheng Peng State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science and Laboratory of Advanced MaterialsFudan UniversityShanghai 200438China Key Laboratory for Advanced Materials Key Laboratory for Advanced MaterialsCentre for Computational Chemistry and Research Institute of Industrial CatalysisEast China University of Science and TechnologyShanghai 200237China State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesCAS Center for Excellence in Superconducting ElectronicsShanghai 200050China Key Laboratory of Systems Bioengineering School of Chemical Engineering and TechnologySynBio Research PlatformCollaborative Innovation Centre of Chemical Science and EngineeringTianjin UniversityTianjin 300072China

Developing efficient electrocatalysts for the oxygen evolution reaction(OER)under neutral conditions is important for microbial electrolysis cells(MECs).However,the OER kinetics in neutral electrolytes at present are extremely sluggish,resulting in high overpotentials that greatly limit the energy conversion efficiencies of *** studies failed to probe the adsorbates on surface metal sites of catalysts at the atomic scale and elucidate their influence on the catalytic activities,which has impeded the rational design of efficient neutral OER catalysts with optimal surface ***,using in situ transmission electron microscopy(TEM),in situ X-ray photoelectron spectroscopy(XPS)and in situ low-energy ion scattering studies,we have identified,for the first time,that the electrochemically activated adsorbates on surface metal sites play a critical role in boosting the neutral OER activities of Ru-Ir binary oxide(RuxIryO2)*** adsorbate-activated RuxIryO2on a glassy carbon electrode achieved a low overpotential of 324 m V at10 m A cm-2in neutral electrolyte,with a 36-fold improvement in turnover frequency compared with that of Ir *** application in an MEC system,the resulting full cell showed a decreased voltage of 1.8 V,200 m V lower than the best value reported to date,facilitating efficient synthesis of poly(3-hydroxybutyrate)from bioelectrochemical *** functional theory(DFT)studies revealed that the enhanced OER activity of RuxIryO2catalyst arose from local structural distortion of adjacent adsorbate-covered Ru octahedra at the catalyst surface and the consequently decreased adsorption energies of OER intermediates on Ir active center.

关键词： electrocatalysis oxygen evolution reaction adsorbates neutral electrolytes

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Cover Picture: Circularly Polarized Luminescence Active Supramolecular Nanotubes Based on PtIIComplexes That Undergo Dynamic Morphological Transformation and Helicity Inversion (Angew. Chem. Int. Ed. 38/2022)

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Angewandte Chemie International Edition 2022年第38期61卷

作者： Seok Gyu Kang Dr. Ka Young Kim Yumi Cho Dong Yeun Jeong Prof. Ji Ha Lee Prof. Tomoki Nishimura Prof. Shim Sung Lee Prof. Sang Kyu Kwak Prof. Youngmin You Prof. Jong Hwa Jung Department of Chemistry and Research Institution of Natural Sciences Gyeongsang National University (GNU) Jinju 52828 Republic of Korea Department of Energy Enginerring School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) Ulsan 44919 Republic of Korea Division of Chemical Engineering and Materials Science Graduate Program in System Health Science and Engineering Ewha Womans University Seoul 03760 Republic of Korea Chemical Engineering Program Graduate School of Advanced Science and Engineering Hiroshima University Hiroshima 739-8527 Japan Department of Chemistry and Materials Faculty of Textile Science and Technology Shinshu University Nagano 386-8567 Japan

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Titelbild: Circularly Polarized Luminescence Active Supramolecular Nanotubes Based on PtIIComplexes That Undergo Dynamic Morphological Transformation and Helicity Inversion (Angew. Chem. 38/2022)

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Angewandte Chemie 2022年第38期134卷

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