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中国化学会2017全国高分子学术论文报告会

作者： Songshan Zeng Dianyun Zhang Wenhan Huang Zhaofeng Wang Stephan G.Freire Xiaoyuan Yu ANDrew T.Smith Emily Y.Huang Helen Nguon Luyi Sun Department of Chemical & Biomolecular Engineering and Polymer Program Institute of Materials ScienceUniversity of Connecticut Department of Mechanical Engineering University of Connecticut School of Mechanical and Electrical Engineering Heyuan Polytechnic Institute of Biomaterial College of Materials and EnergySouth China Agricultural University

We have designed a series of mechanochromic devices inspired by nature with the capabilities of changing transparency and "switching on/off" luminescence in response to mechanical stimuli. The key to accomplish these excellent optical properties is to control strain-induced surface engineering,that is,the longitudinal cracks opening and transverse invaginated folds. All of these devices are comprised of a rigid thin layer atop polydimethylsiloxane(PDMS) based elastomer,which can be facilely and quickly fabricated. For transparency change mechanochromism,the folds and cracks with excellent light trapping and scattering capabilities can endow high opaqueness to the originally highly transparent samples. The evolution of crack opening and fold–ridge mechanisms are captured through finite analysis that incorporates damage and cracks in the rigid thin layer. For luminescent mechanochromism,the strain-tunable cracks on the UV shield layer act as "gates" to mediate the traveling of UV light to "switch on/off" the luminescence of mechanochromism. This device exhibits a remarkably high strain responsive sensitivity,demonstrating an excellent sensing capability for detecting mechanical failure or damage. All the mechanochromisms also show outstanding durability and reversibility.

关键词： mechanochromism crackformation strain luminescence

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XPS study on the thermal stability of oxygen-free Pd/Ti thin film, a new non-evaporable getter (NEG) coating

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AIP Conference Proceedings 2019年第1期2054卷

作者： Tetsuya Miyazawa Masashi Kurihara Shinya Ohno Takashi Kikuchi Kazuhiko Mase 1School of High Energy Accelerator Science SOKENDAI (The Graduate University for Advanced Studies) 1-1 Oho Tsukuba 305-0801 Japan 2Graduate School of Engineering Yokohama National University 79-5 Tokiwadai Hodogaya-ku Yokohama 240-8501 Japan 3Institute of Materials Structure Science KEK 1-1 Oho Tsukuba 305-0801 Japan

Non-evaporable getter (NEG) coating is a technique to coat the inner walls of vacuum chambers with NEG thin films that can be activated through baking under ultrahigh vacuum (UHV). The activated NEG films suppress outgassing from the chambers and evacuate residual gasses, and consequently maintain UHV in the range 10–8 Pa with small ion pumps. The most widely-used NEG coating is deposited TiZrV films that can be fully activated after baking at 180 °C for 24 h. However, NEG coatings have rarely been applied to beamlines and endstations in synchrotron radiation facilities. To expand the scope of NEG coating applications, we developed a new NEG coating using oxygen-free Pd/Ti film deposition. The advantages of oxygen-free Pd/Ti coating are the following: 1) it can be activated by baking at 133–176 °C for 12 h; 2) it does not oxidize even after repeated venting-baking cycles; 3) it is potentially economical; 4) it does not require skilled technicians; 5) it can be applied to large chambers with a complex structure; and 6) it can be applied to narrow tubes where Pd and Ti filaments can be arranged. To investigate the thermal stability of oxygen-free Pd/Ti, we measured a series of X-ray photoelectron spectra of oxygen-free Pd(50 nm)/Ti(1 µm) film deposited on stainless steel 304L as a function of annealing temperature in the range 100–360 °C. Ti was found to segregate the surface and oxidizes forming Ti1+ at 280–300 °C. The results indicate that the maximum allowable temperature of oxygen-free Pd/Ti films is approximately 260 °C.

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Cladophialophora bantiana metabolites are efficient in the larvicidal and ovicidal control of Aedes aegypti, and Culex quinquefasciatus and have low toxicity in zebrafish embryo

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The science of the total environment 2022年 852卷 158502页

作者： Chinnasamy Ragavendran Govindasamy Balasubramani Cherian Tijo Venkatesan Manigandan Eliningaya J Kweka Pandi Karthika Palaniappan Sivasankar Adelina Thomas Devarajan Natarajan Ismini Nakouti Guilherme Malafaia Natural Drug Research Laboratory Department of Biotechnology School of Biosciences Periyar University Salem 636 011 Tamil Nadu India Department of Cariology Saveetha Dental College and Hospitals Saveetha Institute of Medical and Technical Sciences (SIMATS) Chennai 600 077 India. Electronic address: ragavan889@***. Department of Research and Innovation Saveetha School of Engineering Saveetha Institute of Medical and Technical Sciences (SIMATS) Chennai 602105 Tamil Nadu India. Department of Ocean Studies and Marine Biology Pondicherry University Port Blair Campus Brookshabad Port Blair Andamans 744112 India. University of Texas Health Science Center San Antonio TX USA. Division of Livestock and Human Diseases Vector Control Tropical Pesticides Research Institute P.O. Box 3024 Arusha Tanzania Department of Medical Parasitology and Entomology Catholic University of Health and Allied Sciences P.O. Box 1464 Mwanza Tanzania. Natural Drug Research Laboratory Department of Biotechnology School of Biosciences Periyar University Salem 636 011 Tamil Nadu India. Water Supply and Bioeconomy Division Faculty of Environmental Engineering and Energy Poznan University of Technology Berdychowo 4 60-965 Poznan Poland. School of Pharmacy Catholic University of Health and Allied Sciences P.O. Box 1464 Mwanza Tanzania. Centre for Natural Products Discovery (CNPD) School of Pharmacy and Biomolecular Sciences Liverpool John Moores University Liverpool L3 3AF UK. Laboratory of Toxicology Applied to the Environment Goiano Federal Institute Urutaí GO Brazil Post-Graduation Program in Conservation of Cerrado Natural Resources Goiano Federal Institute Urutaí GO Brazil Post-Graduation Program in Ecology Conservation and Biodiversity Federal University of Uberlândia Uberlândia MG Brazil Post-Graduation Program in Biotechnology and Biodiversity Federal University of Goiás Goiânia GO Brazil. Electronic address: guilhermeifgoiano@gmail.com.

Mosquitoes' current insecticide resistance status in available public health insecticides is a serious threat to mosquito control initiatives. Microbe-based control agents provide an alternative to conventional pesticides and insecticides, as they can be more targeted than synthetic insecticides. The present study was focused on identifying and investigating the mosquitocidal potential of Cladophialophora bantiana, an endophytic fungus isolated from Opuntia ficus-indica. The Cladophialophora species was identified through phylogenetic analysis of the rDNA sequence. The isolated fungus was first evaluated for its potential to produce metabolites against Aedes aegpti and Culex quinquefasciatus larvae in the 1-4th instar. The secondary metabolites of mycelium extract were assessed at various test doses (100, 200, 300, 400, and 500 μg/mL) in independent bioassays for each instar of selected mosquito larvae. After 48 h of exposure, A. aegypti expressed LC values of 13.069, 18.085, 9.554, and 11.717 μg/mL and LC = 25.702, 30.860, 17.275, and 19.601 μg/mL; followed by C. quinquefasciatus LC = 14.467, 11.766, 5.934, and 7.589 μg/mL, and LC = 29.529, 20.767, 11.192, and 13.296 μg/mL. The mean % of ovicidal bioassay was recorded 120 h after exposure. The hatchability (%) was proportional to mycelia metabolite concentration. The enzymatic level of acetylcholinesterase in fungal mycelial metabolite treated 4th instar larvae indicated a dose-dependent pattern. The GC-MS profile of C. bantiana extracts identified five of the most abundant compounds, namely cyclobutane, trans-3-undecene-1,5-diyne, 1-bromo-2-chloro, propane, 1,2,3-trichloro-2-methyl-, 5,5,10,10-tetrachlorotricyclo, and phenol, which had the killing effect in mosquitoes. Furthermore, the C. bantiana fungus ethyl acetate extracts had a strong larvicidal action on A. aegypti and C. quinquefasciatus. Finally, the toxicity test on zebrafish embryos revealed the induction of malformations only at concentrations above 1 m

关键词： Biopesticide Ecotoxicity Endophytic fungal Mosquitoes Vector control

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Effects on inter-substitution of SrO to Li2O in borate glass systems doped with Sm3+ ions

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AIP Conference Proceedings 2020年第1期2274卷

作者： A. R. Venugopal R. Rajaramakrishna J. Abhiram Vinayak Pattar K. M. Rajashekara 1Department of Physics Brindavan College of Engineering Bangalore560063 INDIA 5Department of Physics B.G.S R&D Centre SJC Institute of Technology Chikkaballapur Karnataka INDIA 2Department of PG Studies and Research in Physics The National College Jayanagar Bangalore - 560070 INDIA 3Center of Excellence in Glass Technology and Materials Science Nakhon Pathom Rajabhat University Nakhon Pathom73000 Thailand 4Jawaharlal Nehru Centre for Advanced Scientific Research Jakkur Bangalore – 560064 INDIA

The influence of alkali/alkali earth elements like lithium and strontium on optical properties of 60B2O3 - xLi2O - (40 – x) SrO - 0.3Sm2O3 (x=20, 15, 10 and 5 mol %) are reported. Concentration variation of Li2O and SrO alters the structure of the glass network which endow with more non-bridging oxygen's (NBO's) that could affect the optical properties. The glass samples are prepared by melt quenching technique. The non-crystalline nature of the glasses was confirmed through XRD. The structural and optical properties were understood by spectroscopic techniques through UV-VIS-NIR, FTIR and Photoluminescence. It is observed that, the density of glasses increase with increase in the strontium concentration up to 30 mol%. Optical Band gap was evaluated. The IR study shows the presence of various borate groups in the wavelength range between 400 cm−1 to 1600 cm-1. The photoluminescence spectra consists of three prominent emission bands which makes these glasses compatible for reddish orange solid state optoelectronic devices.

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Direct Photocatalytic Synthesis of Medium‐Sized Lactams by C−C Bond Cleavage

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Angewandte Chemie 2018年第43期130卷

作者： Na Wang Qiang‐Shuai Gu Zhong‐Liang Li Zhuang Li Yu‐Long Guo Zhen Guo Xin‐Yuan Liu Department of Chemistry and Shenzhen Grubbs Institute Southern University of Science and Technology Shenzhen 518055 China College of Materials Science & Engineering Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of Education Taiyuan University of Technology Shanxi 030024 China Academy for Advanced Interdisciplinary Studies Southern University of Science and Technology Shenzhen 518055 China

Reported is a novel two‐step ring‐expansion strategy for expeditious synthesis of all ring sizes of synthetically challenging (hetero)aryl‐fused medium‐sized lactams from readily available 5–8‐membered cyclic ketones. This step‐economic approach features a remote radical (hetero)aryl migration from C to N under visible‐light conditions. Broad substrate scope, good functional‐group tolerance, high efficiency, and mild reaction conditions make this procedure very attractive. In addition, this method also provides expedient access to 13–15‐membered macrolactams upon an additional one‐step manipulation. Mechanistic studies indicate that the reaction involves an amidyl radical and is promoted by acid.

关键词： Heterocyclen Ketone Mittelgroße Ringe Photochemie Radikale

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Organosilica: Mesoporous Organosilica Hollow Nanoparticles: Synthesis and Applications (Adv. Mater. 38/2019)

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Advanced materials 2019年第38期31卷

作者： Zhaogang Teng Wei Li Yuxia Tang Ahmed Elzatahry Guangming Lu Dongyuan Zhao Department of Medical Imaging Jinling Hospital School of Medicine Nanjing University Nanjing 210002 Jiangsu P.R. China State Key Laboratory of Analytical Chemistry for Life Science School of Chemistry and Chemical Engineering Nanjing University Nanjing 210093 Jiangsu P.R. China Department of Chemistry Laboratory of Advanced Materials and iChEM Fudan University Shanghai 200433 P.R. China Materials Science and Technology Program College of Arts and Sciences Qatar University Doha 2713 Qatar

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2p-insulator heterointerfaces: Creation of half-metallicity and anionogenic ferromagnetism via double exchange

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Physical Review B 2018年第16期97卷 165109-165109页

作者： Baomin Zhang Chonglong Cao Guowei Li Feng Li Weixiao Ji Shufeng Zhang Miaojuan Ren Haikun Zhang Rui-Qin Zhang Zhicheng Zhong Zhe Yuan Shengjun Yuan Graeme R. Blake School of Physics and Technology University of Jinan 250022 Jinan P. R. China Zernike Institute for Advanced Materials University of Groningen 9747 AG Groningen The Netherlands Department of Physics and Materials Science City University of Hong Kong Hong Kong SAR P. R. China Ningbo Institute of Materials Technology and Engineering (NIMTE) Chinese Academy of Sciences 315201 Ningbo P. R. China The Center for Advanced Quantum Studies and Department of Physics Beijing Normal University 100875 Beijing P. R. China School of Physics and Technology Wuhan University 430072 Wuhan P. R. China

We use first-principles calculations to predict the occurrence of half-metallicity and anionogenic ferromagnetism at the heterointerface between two 2p insulators, taking the KO2/BaO2 (001) interface as an example. Whereas a sharp heterointerface is semiconducting, a heterointerface with a moderate concentration of swapped K and Ba atoms is half-metallic and ferromagnetic at ambient pressure due to the double exchange mechanism. The K-Ba swap renders the interfacial K-O and Ba-O atomic layers electron-doped and hole-doped, respectively. Our findings pave the way to realize metallicity and ferromagnetism at the interface between two 2p insulators, and such systems can constitute a new family of heterostructures with novel properties, expanding studies on heterointerfaces from 3d insulators to 2p insulators.

关键词： Ferromagnetism Magnetic interactions Half-metals Interfaces Magnetic insulators Strongly correlated systems Density functional theory First-principles calculations

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Electric-field guided precision manipulation of catalytic nanomotors for cargo delivery and powering nanoelectromechanical devices

arXiv

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arXiv 2017年

作者： Guo, Jianhe Gallegos, Jeremie June Tom, Ashley Robyn Fan, Donglei Materials Science and Engineering Program University of Texas at Austin AustinTX78712 United States Department of Mechanical Engineering University of Texas at Austin AustinTX78712 United States

We report a controllable and precision approach in manipulating catalytic nanomotors by strategically applied electric (E-) fields in three dimensions (3-D). With the high controllability, the catalytic nanomotors have demonstrated new versatility in capturing, delivering, and releasing of cargos to designated locations as well as in-situ integration with nanomechanical devices (NEMS) to chemically power the actuation. With combined AC and DC E-fields, catalytic nanomo-tors can be accurately aligned by the AC E-fields and instantly change their speeds by the DC E-fields. Within the 3-D orthogonal microelectrode sets, the in-plane transport of catalytic nanomotors can be swiftly turned on and off, and these catalytic nanomotors can also move in the vertical direction. The interplaying nanoforces that govern the propulsion and alignment are investigated. The modeling of catalytic nanomotors proposed in previous works has been confirmed quanti-tatively here. Finally, the prowess of the precision manipulation of catalytic nanomotors by E-fields is demonstrated in two applications: the capture, transport, and release of cargos to pre-patterned microdocks, and the assembly of catalytic na-nomotors on NEMS to power the continuous rotation. The innovative concepts and approaches reported in this work could further advance ideal applications of catalytic nanomotors, e.g. for assembling and powering nanomachines, nanorobots, and complex NEMS devices. Copyright © 2017, The Authors. All rights reserved.

关键词： Nanotechnology

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Nanophotonic engineering of far-field thermal emitters

arXiv

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arXiv 2018年

作者： Baranov, Denis G. Xiao, Yuzhe Nechepurenko, Igor A. Krasnok, Alex Alù, Andrea Kats, Mikhail A. Department of Physics Chalmers University of Technology Gothenburg412 96 Sweden Department of Electrical and Computer Engineering University of Wisconsin-Madison WI United States Dukhov Research Institute of Automatics 22 Sushchevskaya Moscow127055 Russia Photonics Initiative Advanced Science Research Center City University of New York NY10031 United States Physics Program Graduate Center City University of New York NY10016 United States Department of Electrical Engineering City College of The City University of New York New York10031 United States Department of Materials Science and Engineering University of Wisconsin-Madison WI United States Department of Physics University of Wisconsin-Madison WI United States

Thermal emission is a ubiquitous and fundamental process by which all objects at non-zero temperatures radiate electromagnetic energy. This process is often presented to be incoherent in both space and time, resulting in broadband, omnidirectional light emission toward the far field, with a spectral density related to the emitter temperature by Planck’s law. Over the past two decades, there has been considerable progress in engineering the spectrum, directionality, polarization, and temporal response of thermally emitted light using nanostructured materials. This review summarizes the basic physics of thermal emission, lays out various nanophotonic approaches to engineer thermal-emission in the far field, and highlights several relevant applications, including energy harvesting, lighting, and radiative cooling. Copyright © 2018, The Authors. All rights reserved.

关键词： Spectral density

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Electronic Skins: Natural Plant materials as Dielectric Layer for Highly Sensitive Flexible Electronic Skin (Small 35/2018)

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Small 2018年第35期14卷

作者： Yongbiao Wan Zhiguang Qiu Jun Huang Jingyi Yang Qi Wang Peng Lu Junlong Yang Jianming Zhang Siya Huang Zhigang Wu Chuan Fei Guo Department of Materials Science and Engineering Southern University of Science and Technology Shenzhen 518055 China School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China Academy for Advanced Interdisciplinary Studies Southern University of Science and Technology Shenzhen 518055 China State Key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and Technology Wuhan 430074 China

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