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Visible light-driven superoxide generation by conjugated polymers for organic synthesis

Nano Research 2018年第2期11卷 1099-1108页

作者： Feili Lai Yue Wang Dandan Li Xianshun Sun Juan Peng Xiaodong Zhang Yupeng Tian Tianxi Liu Hefei National Laboratory for Physical Science at Microscale Collaborative Innovation Center of Chemistry for Energy Materials University of Science and Technology of China Hefei China State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science Fudan University Shanghai China Department of Chemistry Anhui University Hefei China State Key Laboratory of Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University Shanghai China

Benefiting from their unique delocalized electronic structure, conjugated polymer-based semiconductors are widely applied in the fields of organic electronics, sensors, and biomedical applications. However, the photocatalytic properties of conjugated polymers have been seldom studied because of their unsuitable band structures. Herein, we creatively demonstrate that the band structures of conjugated polymers are strongly related to their degree of polymerization （DP）, offering an effective strategy for the design of metal-free photocatalysts with tunable light absorption properties. Taking poly（3- hexylthiophene）（PHT） as an example, we show that PHT nanofibers with a suitable DP are a novel visible light-driven photocatalyst, which can readily convert molecular oxygen into superoxide ions. Benefiting from the high selectivity of the generated superoxides, the PHT nanofibers display outstanding activity for the aerobic oxidation of amines into imines with nearly 100% conversion and selectivity. This study offers a new strategy for the design of advanced coniugated Dolvrner-based Dhotocatalvsts.

关键词： visible light poly（3-hexylthiophene）（PHT） superoxide selective aerobic oxidation photocatalysis

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Indirect but Efficient: Laser-Excited Electrons Can Drive Ultrafast Polarization Switching in Ferroelectric Materials

arXiv

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arXiv 2019年

作者： Lian, Chao Ali, Zulfikhar A. Kwon, Hyuna Wong, Bryan M. Department of Chemical & Environmental Engineering Materials Science & Engineering Program Department of Physics & Astronomy University of California-Riverside RiversideCA92521 United States

To enhance the efficiency of next-generation ferroelectric (FE) electronic devices, new techniques for controlling ferroelectric polarization switching are required. While most prior studies have attempted to induce polarization switching via the excitation of phonons, these experimental techniques required intricate and expensive terahertz sources and have not been completely successful. Here, we propose a new mechanism for rapidly and efficiently switching the FE polarization via laser-tuning of the underlying dynamical potential energy surface. Using time-dependent density functional calculations, we observe an ultrafast switching of the FE polarization in BaTiO3 within 200 femtoseconds. A laser pulse can induce a charge density redistribution that reduces the original FE charge order. This excitation results in both desirable and highly directional ionic forces that are always opposite to the original FE displacements. Our new mechanism enables the reversible switching of the FE polarization with optical pulses that can be produced from existing 800-nm experimental laser sources. Copyright © 2019, The Authors. All rights reserved.

关键词： Ferroelectricity

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Rational design of pyrene and thienyltriazine-based conjugated microporous polymers for high-performance energy storage and visible-light photocatalytic hydrogen evolution from water

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Giant 2024年 17卷

作者： Santosh U. Sharma Mohamed Hammad Elsayed Islam M.A. Mekhemer Tso Shiuan Meng Ho-Hsiu Chou Shiao-Wei Kuo Mohamed Gamal Mohamed Department of Chemistry National Sun Yat-Sen University Kaohsiung 80424 Taiwan International PhD Program for Science National Sun Yat-sen University Kaohsiung 80424 Taiwan Department of Chemistry Faculty of Science Al-Azhar University Nasr City 11884 Cairo Egypt Department of Chemical Engineering National Tsing Hua University Hsinchu 300044 Taiwan Chemistry Department Faculty of Science Assiut University Assiut 71515 Egypt Department of Materials and Optoelectronic Science College of Semiconductor and Advanced Technology Research Center for Functional Polymers and Supramolecular Materials National Sun Yat-Sen University Kaohsiung 804 Taiwan Department of Medicinal and Applied Chemistry Kaohsiung Medical University Kaohsiung 807 Taiwan

Conjugated microporous polymers (CMPs) have found extensive applications in various fields such as optoelectronics, CO 2 capture, and catalysis. However, their potential in electrochemical supercapacitors as energy storage and H 2 production systems remains relatively unexplored. This limited exploration can be attributed to certain challenges, including issues related to structural and electrochemical stability, as well as the relatively modest specific capacitance. Additionally, many of the CMPs discovered thus far have exhibited lower energy densities, further contributing to this underexplored aspect of their utility. In this study, we prepared two different CMPs [TPET-TTh and PyT-TTh CMPs] containing thienyltriazine units (TTh) for the redox mechanism and constructed electrodes for supercapacitor applications. The synthesized TPET-TTh and PyT-TTh CMPs displayed exceptionally high specific surface areas of 545 and 528 m² g⁻¹, respectively. Furthermore, their pore sizes were very similar, centered at approximately 0.39 and 0.36 nm, respectively. To evaluate their electrochemical properties, the TTh-CMPs were examined using cyclic voltammetry (CV) and galvanostatic charge/discharge (GCD). The resulting CV curves exhibited rectangular shapes, indicative of the characteristic behavior of electric double-layer capacitors, across a range of potential and scan rates. These TPET-TTh and PyT-TTh CMPs delivered nominal specific capacitances of 74 and 76 F g −1 at 0.5 A g −1 , respectively. In addition, they exhibited outstanding capacity retentions of 95.2 and 97.30 % even after 2000 cycles [analyzed at 10 A g −1 ]. The TTh-CMPs also exhibited excellent light-capture capabilities. The PyT-TTh CMP has faster charge separation and lower charge recombination rates than TPET-TTh CMP. This results in a higher hydrogen evolution rate from the water decomposition reaction. The H 2 production rate of PyT-TTh CMP could be as high as 18,533 μmol g −1 h −1 , which is approximately 4

关键词： Pyrene 2,4,6-tri(thiophen-2-yl)-1,3,5-triazine Conjugated microporous polymer Supercapacitors H 2 evolution

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Charge density wave hampers exciton condensation in 1T-TiSe2

arXiv

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arXiv 2019年

作者： Lian, Chao Ali, Zulfikhar A. Wong, Bryan M. Department of Chemical & Environmental Engineering Materials Science & Engineering Program Department of Physics & Astronomy University of California-Riverside RiversideCA92521 United States

The Bose-Einstein condensation of excitons continues to garner immense attention as a prototypical example for observing emergent properties from many-body quantum effects. In particular, Titanium Diselenide (TiSe2) is a promising candidate for realizing exciton condensation and was experimentally observed only very recently [science 358 1314 (2017)]. Surprisingly, the condensate was experimentally characterized by a soft plasmon mode that only exists near the transition temperature, Tc, of the charge density wave (CDW). Here, we characterize and analyze the experimental spectra using linear-response time-dependent density functional theory and find that the soft mode can be attributed to interband electronic transitions. At the CDW state below Tc, the periodic lattice distortions hamper the spontaneous formation of the exciton by introducing a CDW gap. The band gap raises the soft mode and merges it into the regular plasmon. Our surprising results contradict previous simplistic analytical models commonly used in the scientific literature. In addition, we find that a finite electronic temperature, Te, introduces a dissipation channel and prevents the condensation above Tc. The combined effect of the CDW and Te explains the fragile temperature-dependence of the exciton condensation. Taken together, our work provides the first ab initio atomic-level framework for rationalizing recent experiments and further manipulating exciton condensates in TiSe2. Copyright © 2019, The Authors. All rights reserved.

关键词： Selenium compounds

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Corrigendum to “Metal ratio and bimetal nanoarchitectonics of ammonia-based fluoride complex induced nickel hydroxide and manganese oxide composites as active materials of an energy storage device” [J. Energy Storage 80 (2024) 110316]

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Journal of Energy Storage 2025年 108卷

作者： Chuan-Chih Hsu You Zher Yu Chung-Hsien Wu Pin-Yan Lee Hung-Ming Chen Sadang Husain Chutima Kongvarhodom Yu-Cheng Hsiao Lu-Yin Lin Division of Cardiovascular Surgery Department of Surgery School of Medicine College of Medicine Taipei Medical University Taiwan Division of Cardiovascular Surgery Department of Surgery Taipei Medical University Hospital Taiwan Department of Chemical Engineering and Biotechnology National Taipei University of Technology Taipei Taiwan Gingen Technology Co. LTD. Rm. 7 10F. No.189 Sec. 2 Keelung Rd. Xinyi Dist. Taipei 11054 Taiwan Department of Physics Faculty of Mathematics and Natural Science Lambung Mangkurat University Banjarmasin 70124 Indonesia Department of Chemical Engineering King Mongkut's University of Technology Thonburi 126 Pracha-u-thit Toong-kru Bangkok 10140 Thailand Cell Physiology and Molecular Image Research Center Wan Fang Hospital Taipei Medical University Taipei 11696 Taiwan International PhD Program in Biomedical Engineering College of Biomedical Engineering Taipei Medical University Taipei 11031 Taiwan Stanford Byers Center for Biodesign Stanford University CA 94305-5428 USA Graduate Institute of Biomedical Optomechatronics College of Biomedical Engineering Taipei Medical University Taipei 11031 Taiwan

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Mechanistic insights of facile synthesized-solar driven TiO 2 intercalated 2D molybdenum disulfide evaporator for one-pot clean water production

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Desalination 2025年 613卷

作者： Nurul Syazana Fuzil Nur Hashimah Alias Nur Hidayati Othman Muhammad Shafiq Mat Shayuti Norazah Abd Rahman Zulkifli Abdul Rashid Ahmad Fauzi Ismail Anwar Ul-Hamid Izumi Ichinose Department of Oil and Gas Engineering Faculty of Chemical Engineering Universiti Teknologi MARA 40450 Shah Alam Selangor Malaysia School of Chemistry Chemical Engineering and Biotechnology Nanyang Technological University 637459 Singapore Singapore Hydrogen Program R&D Department Group Research & Technology (GR&T) Project Delivery & Technology (PD&T) PETRONAS Research Sdn Bhd Jalan Ayer Itam Kawasan Institusi Bangi Kajang 43000 Malaysia Advanced Membrane Technology Research Centre (AMTEC) Universiti Teknologi Malaysia 81310 Skudai Johor Malaysia Core Research Facilities King Fahd University of Petroleum & Minerals Dhahran 31261 Saudi Arabia Research Center for Functional Materials National Institute for Materials Science (NIMS) Tsukuba Ibaraki 305-0044 Japan

Rising water pollution and increasing demand for water have caused a global freshwater shortage, leading to serious health issues and slowing development. Since seawater constitutes about 97.5 % of the Earth's water, desalination is essential to solve this crisis. Solar water evaporation technology, which utilizes photothermal materials, is considered one of the most sustainable and crucial solutions for clean water production and addressing freshwater scarcity. However, photothermal materials are limited by their high preparation costs, low evaporation efficiency, and poor photothermal conversion. MoS 2 is a promising material with high solar to thermal conversion, but it suffers from poor thermal stability, limited active surface area, and agglomeration, which reduces its performance. To address these limitations, this study synthesized a high-performance photothermal titanium dioxide (TiO 2 ) intercalated two-dimensional (2D) molybdenum disulfide (MoS 2 ) composite via a hydrothermal method to increase the MoS 2 active surface area with high thermal stability TiO 2, which can improve the solar thermal conversion. The TiO 2 -MoS 2 solar evaporator was constructed by attaching coated filter paper to polystyrene (PS) foam for structural support and thermal insulation, which enabled a heat localization effect. In contrast, a cotton wool positioned at the center of the filter paper facilitated water transport. This solar evaporator showed excellent photothermal efficiency (93.8 %) under standard sunlight intensity of 1.0 sun (1 kW‧m −2 ). The high evaporation rate achieved (1.22 kg‧m −2 ‧h −1 ) was four times greater than that of a bare solar evaporator (0.3 kg‧m −2 ‧h −1 ) with a 35 g‧L −1 NaCl feed solution. This enhancement is attributed to improved morphological and photothermal properties, where TiO 2 stabilized MoS 2 , prevented agglomeration, increased active surface area, and enhanced light absorption, enabling an efficient one-pot clean water production proce

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The Analysis of Ecological Footprint at Farming Production Centre Cluster of MIFEE program in Merauke Papua 4

The Analysis of Ecological Footprint at Farming Production C...

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4th International Conference on Energy, Environment, Epidemiology and Information System, ICENIS 2019

作者： Djaja, Irba Purwanto, P. Sunoko, H.R. Muslihudin, Muslihudin Agrotechnology Faculty University of Musamus Merauke Indonesia Doctoral Program of Environmental Science School of Postgraduate Studies Diponegoro University Semarang Indonesia Department of Chemical Engineering Faculty of Engineering Diponegoro University Semarang Indonesia Department of Pharmacy Faculty of Medical Diponegoro University Semarang Indonesia Sociology Department Faculty of Social and Political Sciences Jenderal Soedirman University Purwokerto Indonesia

The heading Ecological footprint is one of the methods developed to respond sustainable development issue expected to measure the availability and usage of natural resources affecting the ecology of environment. The purpose of this study is to count the value of ecological footprint at Farming Production Centre Merauke through the supply and demand approach based on GFN (Global Footprint Network) and count the capacity of environment. The method used was Global Footprint Network, and counting capacity method. The results of ecological footprint counting was 29.9536 gha/inhabitant and the value of bio-capacity (supply) was gha/inhabitant, so the ecology (environmental support) value was 1,1936gha/inhabitant. The results show that the Farming Production Centre is categorized into ecological surplus and the capacity is 36,8964inhabitants/ha. The value shows that the environment and ecosystem condition in the development area of Farming Production Centre in Merauke, Merauke Integrated Food and Energy Estate, is able to accommodate the needs and support the people living in the area (ecological debt). © The Authors, published by EDP sciences, 2019.

关键词： Ecology

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Project 1000 x 1000: Centrifugal melt spinning for distributed manufacturing of N95 filtering facepiece respirators

arXiv

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arXiv 2020年

作者： Molina, Anton Vyas, Pranav Khlystov, Nikita Kumar, Shailabh Kothari, Anesta Deriso, Dave Liu, Zhiru Banavar, Samhita Flaum, Eliott Prakash, Manu Department of Materials Science and Engineering Stanford University StanfordCA94305 United States Department of Bioengineering Stanford University StanfordCA94305 United States Department of Chemical Engineering Stanford University StanfordCA94305 United States Department of Electrical Engineering Stanford University StanfordCA94305 United States Department of Applied Physics Stanford University StanfordCA94305 United States Program in Biophysics Stanford University StanfordCA94305 United States

The COVID-19 pandemic has caused a global shortage of personal protective equipment. While existing supply chains are struggling to meet the surge in demand, the limited supply of N95 filtering facepiece respirators (FFRs) has placed healthcare workers at risk. This paper presents a method for scalable and distributed manufacturing of FFR filter material based on a combination of centrifugal melt spinning utilizing readily available cotton candy machines as an example. The proposed method produces nonwoven polypropylene fabric material with filtering efficiency of up to 96% for particles 0.30-0.49 µm in diameter. We additionally demonstrate a scalable means to test for filtration efficiency and pressure drop to ensure a standardized degree of quality in the output material. We perform preliminary optimization of relevant parameters for scale-up and propose that this is a viable method to rapidly produce up to one million N95 FFRs per day in distributed manner with just six machines per site operating across 200 locations. We share this work as a starting point for others to rapidly construct, replicate and develop their own affordable modular processes aimed at producing high quality filtration material to address the current FFR shortage globally. Copyright © 2020, The Authors. All rights reserved.

关键词： Melt spinning

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Interfacial Polymerization at the Alkane/Ionic Liquid Interface

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Angewandte Chemie 2021年第26期133卷

作者： Chang Liu Dr. Jing Yang Bian-Bian Guo Prof. Seema Agarwal Prof. Andreas Greiner Prof. Zhi-Kang Xu MOE Key Laboratory of Macromolecular Synthesis and Functionalization Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China College of Material Chemistry and Chemical Engineering Hangzhou Normal University Hangzhou 310036 China Macromolecular Chemistry and Bavarian Polymer Institute University of Bayreuth Universitatsstrasse 30 95440 Bayreuth Germany College of Chemical and Biological Engineering Zhejiang University Hangzhou 310027 China

Polymerization at the liquid–liquid interface has attracted much attention for synthesizing ultrathin polymer films for molecular sieving. However, it remains a major challenge to conduct this process outside the alkane–water interface since it not only suffers water-caused side reactions but also is limited to water-soluble monomers. Here, we report the interfacial polymerization at the alkane/ionic liquid interface (IP@AILI) where the ionic liquid acts as the universal solvent for diversified amines to synthesize task-specific polyamide nanofilms. We propose that IP@AILI occurs when acyl chloride diffuses from the alkane into the ionic liquid instead of being triggered by the diffusion of amines as in the conventional alkane–water system, which is demonstrated by thermodynamic partitioning and kinetic monitoring. The prepared polyamide nanofilms with precisely adjustable pore sizes display unprecedented permeability and selectivity in various separation processes.

关键词： interfacial polymerization ionic liquids membranes nanofilms polyamides

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Phytotherapeutic potential of Campomanesia xanthocarpa (Mart.) O. Berg: antitumor effects in vitro and in silico, with emphasis on SK-MEL-28 melanoma cells-a study on leaf and fruit infusions

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In silico pharmacology 2024年第2期12卷 105页

作者： Vanessa Ruana Ferreira da Silva Gilnei Bruno da Silva Daiane Manica Carolina Turnes Pasini Deolindo Margarete Dulce Bagatini Aniela Pinto Kempka Multicentric Postgraduate Program in Biochemistry and Molecular Biology State University of Santa Catarina Lages SC Brazil. Postgraduate Program in Biochemistry Federal University of Santa Catarina Florianópolis SC Brazil. Ministry of AgricultureLivestock and Food Supply Federal Agricultural Defense Laboratory São José SC Brazil. Department of Food Science and Technology Federal University of Santa Catarina Florianópolis SC Brazil. Postgraduate Program in Biomedical Sciences Federal University of Fronteira Sul Chapecó SC Brazil. Department of Food Engineering and Chemical Engineering Santa Catarina State University Fernando de Noronha Street BR 282 Km 573.5 Pinhalzinho SC 89870-000 Brazil.

The study investigated the efficacy of Campomanesia xanthocarpa infusions on human melanoma cells (SK-MEL-28). The phytochemical profile revealed 18 phenolic compounds in the leaf infusion and 9 in the fruit infusion. After 24 h of treatment, the infusions demonstrated antineoplastic effects, reducing cell viability at all tested concentrations for the leaf infusion. For the fruit infusion, a significant reduction in cell viability was observed specifically at the 800 μg/mL concentration. Fluorescence microscopy and mitochondrial membrane potential results indicated that the leaf infusion was more effective in reducing cell viability and mitochondrial function in SK-MEL-28 cells, possibly due to its greater variety of phenolic compounds compared to the fruit infusion. The leaf infusion also induced higher production of intracellular reactive oxygen species compared to the fruit infusion. Protein sulfhydryl levels were reduced for the leaf infusion. Epigallocatechin gallate, Isoquercitrin, Rutin, Kaempferol-3-O-rutinoside, Chlorogenic acid, and Ellagic acid were identified as the main compounds with activity against SK-MEL-28 cells. Molecular docking analysis underscored factors such as affinity, cavity size, binding mode, and contact residues with specific compounds chosen for their favorable properties in targeting BRAF, CDK4, CDK6, MEK1, and MEK2. The variability in binding affinities may directly influence the compounds' ability to inhibit different signaling pathways related to cancer cell growth and proliferation. The results suggest that phenolic compounds from C. xanthocarpa extracts have therapeutic potential and could contribute to melanoma therapies.

关键词： Antineoplastic effect Bioactive compounds Cell viability Molecular docking SK-MEL-28 Simultaneous inhibitions

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