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Free Surface Relaxations of Star-Shaped Polymer Films

Physical Review Letters 2017年第22期119卷 227801-227801页

作者： Emmanouil Glynos Kyle J. Johnson Bradley Frieberg Alexandros Chremos Suresh Narayanan Georgios Sakellariou Peter F. Green Institute of Electronic Structure and Laser Foundation for Research and Technology-Hellas P.O. Box 1385 711 10 Heraklion Crete Greece Department of Material Science and Engineering University of Michigan Ann Arbor Michigan 48109 USA Biointeraces Institute University of Michigan Ann Arbor Michigan 48109 USA Macromolecular Science and Engineering University of Michigan Ann Arbor Michigan 48109 USA Materials Science and Engineering Division National Institute of Standards and Technology Gaithersburg Maryland 20899 USA X-ray Science Division Argonne National Laboratory Argonne Illinois 60439 USA Department of Chemistry National and Kapodistrian University of Athens Panepistimiopolis Zografou 15771 Athens Greece National Renewable Energy Laboratory (NREL) Golden Colorado 80401 USA

The surface relaxation dynamics of supported star-shaped polymer thin films are shown to be slower than the bulk, persisting up to temperatures at least 50 K above the bulk glass transition temperature Tgbulk. This be... 详细信息

关键词： Transport phenomena Polymers Thin films

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Effect of compaction pressure of green body and heating current on photoluminescence property of ZnO crystal grown by electric current heating method

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IOP Conference Series: materials science and engineering 2018年第1期290卷

作者： A G E Sutjipto M H Mazwir H L Yee S R Misskon A G M Shaitir M A Jusoh R Othman Material Technology Program Faculty of Industrial Sciences & Technology Universiti Malaysia Pahang (UMP) Gambang 26300 Pahang Malaysia Department of Science in Engineering Faculty of Engineering International Islamic University Malaysia (IIUM) Jalan Gombak 53300 Kuala Lumpur Malaysia

In this study, we reported the effect of applied compaction pressure on green body and electric current heating on ceramic bar on the ZnO crystal growth and its photoluminescence characteristic. Crystals grown on ZnO bar sintered by 1100 °C were mostly on (1 0 1) orientation. Sample with 3.0 ton and 3.0 A for applied pressure and current, respectively revealed the shortest photoluminescence (PL) wavelength of 409.5 nm with highest emission energy of 3.03 eV.

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Benzonorcorrole NiIIComplexes: Enhancement of Paratropic Ring Current and Singlet Diradical Character by Benzo‐Fusion

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Angewandte Chemie 2018年第8期130卷

作者： Takuya Yoshida Kohtaro Takahashi Yuki Ide Ryohei Kishi Jun‐ya Fujiyoshi Sangsu Lee Yuya Hiraoka Dongho Kim Masayoshi Nakano Takahisa Ikeue Hiroko Yamada Hiroshi Shinokubo Department of Molecular and Macromolecular Chemistry Graduate School of Engineering Nagoya University Furo-cho Chikusa-ku Nagoya 464-8603 Japan Graduate School of Material Science Nara Institute of Science and Technology 8916-5 Takayama-cho Ikoma Nara 630-0192 Japan Department of Chemistry Graduate School of Science and Engineering Shimane University 1060 Nishikawatsu Matsue 690-8540 Japan Graduate School of Engineering Science Osaka University Toyonaka Osaka 560-8531 Japan Spectroscopy Laboratory for Functional π-Electronic Systems and Department of Chemistry Yonsei University Seoul 03722 Korea

Fused benzene rings to antiaromatic compounds generally improve their stability but attenuate their antiaromaticity. The opposite case is now reported. Ni II benzonorcorroles were synthesized and the effect of benzo‐fusion on the antiaromaticity was elucidated. The benzo‐fusion resulted in significant decrease of the HOMO–LUMO gaps and enhancement of the paratropic ring current effect. Furthermore, the introduction of the benzo groups induced singlet diradical character in the antiaromatic porphyrinoid.

关键词： Antiaromatizität Diradikale Porphyrinoide Ringstrom

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Controlled synthesis, characterization and reduction of graphene oxide: A convenient method for large scale production

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Egyptian Journal of Basic and Applied sciences 2017年第1期4卷 74-79页

作者： Tarko Fentaw Emiru Delele Worku Ayele Material Science and Engineering Program College of Science Bahir Dar University P.O. Box 79 Bahir Dar Ethiopia Department of Chemistry College of Science Bahir Dar University P.O. Box 79 Bahir Dar Ethiopia Energy Research Center Bahir Dar Institute of Technology Bahir Dar University P.O. Box 79 Bahir Dar Ethiopia

In this work, graphene oxide was synthesized by treating graphite powder with KMnO 4 and a mixture of concentrated H 2 SO 4 /H 3 PO 4 and reduced with ascorbic acid to produce reduced graphene oxide. The effects of reaction parameters such as reaction time, reaction temperature and amount of KMnO 4 on the degree of oxidation of graphite powder to graphene oxide were studied. The prepared graphene oxide and reduced graphene oxide were characterized by UV–Visible spectroscopy, FT-IR spectroscopy, and XRD. The results showed that treating graphite powder with KMnO 4 at 40 °C for 12 h resulted in better degree of oxidation. The designed synthesis strategy could be simple/convenient, easily controlled and an alternative approach for large scale production of graphene oxide (GO) and reduced graphene oxide (rGO).

关键词： Graphite powder Graphene oxide Reduced graphene oxide Optical properties Large scale production

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Liquid crystal self-assembly of upconversion nanorods enriched by depletion forces for mesostructured material preparation

arXiv

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arXiv 2017年

作者： Xie, Yong Li, Yuanyuan Wei, Guoqing Liu, Qingkun Mundoor, Haridas Chen, Ziyu Smalyukh, Ivan I. Department of Physics Material Science and Engineering Program Department of Electrical Computer& Energy Engineering Liquid Crystal Materials Research Center University of Colorado BoulderCO80309 United States Department of Physics Beihang University Beijing100191 China National Renewable Energy Laboratory and University of Colorado Renewable and Sustainable Energy Institute BoulderCO80309 United States

Monodisperse rod-like colloidal particles are known for spontaneously forming both nematic and smectic liquid crystal phases, but their self-assembly was typically exploited from the fundamental soft condensed matter physics perspective. Here we demonstrate that depletion interactions, driven by non-adsorbing polymers like dextran and surfactants, can be used to enrich self-organization of photon-upconversion nanorods into orientationally ordered nematic and smectic-like membrane colloidal superstructures. We study thermodynamic phase diagrams and demonstrate polarization-dependent photon upconversion exhibited by the ensuing composites, which arises from the superposition of unique properties of the solid nanostructures and the long-range ordering enabled by liquid crystalline self-organization. Finally, we discuss how our method of utilizing self-assembly due to the steric and electrostatic interactions, along with attractive depletion forces, can enable technological uses of lyotropic colloidal liquid crystals and mesostructured composite materials enabled by them, even when they are formed by anisotropic nanoparticles with relatively small aspect ratios. Copyright © 2017, The Authors. All rights reserved.

关键词： Nanorods

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Micro-scale finite element study of the damping in unidirectional fiber reinforced composites 17

Micro-scale finite element study of the damping in unidirect...

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17th European Conference on Composite materials, ECCM 2016

作者： Rezaei, A. Garoz, D. Faes, J. Gilabert, F.A. Desmet, W. Van Paepegem, W. Department of Material Science and Engineering Faculty of Engineering and Architecture Ghent University Tech. Lane Ghent Science Park - Campus A Technologiepark 903 Zwijnaarde Belgium Section Department of Mechanical Engineering KULeuven Leuven Belgium SIM Program M3Strength Technologiepark Zwijnaarde 935 ZwijnaardeB-9052 Belgium

ISBN: (纸本)9783000533877

This article employs the strain energy finite element method to study the anisotropic damping of unidirectional fiber reinforced composites in micro-scale. The simulations have been performed on a Representative Volume Element composed of randomly distributed glass fibers in an epoxy polymer matrix. The models include also Periodic Boundary Conditions. Influence of the fiber volume fraction on the loss factors of a unidirectional fiber reinforced composite is investigated. At the end of the article, using a simplified model, effect of a homogeneous and isotropic hard or soft interphases on the loss factors of a composite is studied. © 2016, European Conference on Composite materials, ECCM. All rights reserved.

关键词： Damping

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Magnetoresistance in the superconducting state at the (111) LaAlO3/SrTiO3 interface

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Physical Review B 2017年第13期96卷 134502-134502页

作者： S. Davis Z. Huang K. Han Ariando T. Venkatesan V. Chandrasekhar Graduate Program in Applied Physics Northwestern University 2145 Sheridan Road Evanston Illinois 60208 USA NUSNNI-Nanocore National University of Singapore 117411 Singapore Department of Physics National University of Singapore 117551 Singapore NUS Graduate School for Integrative Sciences & Engineering National University of Singapore 117456 Singapore Department of Electrical and Computer Engineering National University of Singapore 117576 Singapore Department of Material Science and Engineering National University of Singapore 117575 Singapore Department of Physics and Astronomy Graduate Program in Applied Physics Northwestern University 2145 Sheridan Road Evanston Illinois 60208 USA

Condensed-matter systems that simultaneously exhibit superconductivity and ferromagnetism are rare due the antagonistic relationship between conventional spin-singlet superconductivity and ferromagnetic order. In materials in which superconductivity and magnetic order are known to coexist (such as some heavy-fermion materials), the superconductivity is thought to be of an unconventional nature. Recently, the conducting gas that lives at the interface between the perovskite band insulators LaAlO3 (LAO) and SrTiO3 (STO) has also been shown to host both superconductivity and magnetism. Most previous research has focused on LAO/STO samples in which the interface is on the (001) crystal plane. Relatively little work has focused on the (111) crystal orientation, which has hexagonal symmetry at the interface, and has been predicted to have potentially interesting topological properties, including unconventional superconducting pairing states. Here we report measurements of the magnetoresistance of (111) LAO/STO heterostructures at temperatures at which they are also superconducting. As with the (001) structures, the magnetoresistance is hysteretic, indicating the coexistence of magnetism and superconductivity, but in addition, we find that this magnetoresistance is anisotropic. Such an anisotropic response is completely unexpected in the superconducting state and suggests that (111) LAO/STO heterostructures may support unconventional superconductivity.

关键词： Coherence length Ferromagnetism Magnetotransport Phase diagrams Superconducting phase transition Superconductivity Hall bar Resistivity measurements

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Definition of periodic boundary conditions in explicit dynamic simulations of micro- or meso-scale unit cells with conformal and non-conformal meshes 17

Definition of periodic boundary conditions in explicit dynam...

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17th European Conference on Composite materials, ECCM 2016

作者： Garoz, D. Gilabert, F.A. Sevenois, R.D.B. Spronk, S.W.F. Rezaei, A. Van Paepegem, W. Department of Material Science and Engineering Faculty of Engineering and Architecture Ghent University Tech Lane Ghent Science Park - Campus A Technologiepark Zwijnaarde 903 ZwijnaardeB-9052 Belgium SIM Program M3Strength Technologiepark Zwijnaarde 935 ZwijnaardeB-9052 Belgium

ISBN: (纸本)9783000533877

Although Periodic Boundary Conditions (PBCs) have been extensively used in finite elements to analyze unit cell models of composites, there are few reported investigations using explicit dynamic simulations. While different formulations and implementations of PBCs do not affect the results of quasi-static simulations solved by an implicit solver, they have an impact on the results of dynamic simulations solved by an explicit solver. A simple benchmark with a cubic unit cell of an isotropic linear elastic material is used to compare the results of different scenarios, which have different formulations and implementation of PBCs. The stress-strain curves under simple uniaxial tension shows that, in some scenarios, the explicit analyses do not follow the expected linear elastic behavior. These unexpected results are remarkable when the characteristic length of the model is in the range of few microns. This work encapsulates the relevant features of the different formulations and implementations of PBCs, and indicates in which scenarios the PBCs must be carefully applied. © 2016, European Conference on Composite materials, ECCM. All rights reserved.

关键词： Stress-strain curves

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Erratum: “Growth and characterization of β-Ga2O3 thin films by molecular beam epitaxy for deep-UV photodetectors” [J. Appl. Phys. 122, 095302 (2017)]

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Journal of Applied Physics 2018年第13期124卷

作者： Susmita Ghose Shafiqur Rahman Liang Hong Juan Salvador Rojas-Ramirez Hanbyul Jin Kibog Park Robert Klie Ravi Droopad 1Material Science Engineering and Commercialization Program Texas State University San Marcos Texas 78666 USA 2Department of Physics University of Illinois at Chicago Chicago Illinois 60607 USA 3Ingram School of Engineering Texas State University San Marcos Texas 78666 USA 4School of Electrical and Computer Engineering Ulsan National Institute of Science and Technology (UNIST) Ulsan 44919 South Korea 5Department of Physics Ulsan National Institute of Science and Technology (UNIST) Ulsan 44919 South Korea

We noticed an omission of the acknowledgment and provide it here with apologies:1

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Designing a Perylene Diimide/Fullerene Hybrid as Effective Electron Transporting material in Inverted Perovskite Solar Cells with Enhanced Efficiency and Stability

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Angewandte Chemie 2019年第25期131卷

作者： Zhenghui Luo Fei Wu Teng Zhang Xuan Zeng Yiqun Xiao Tao Liu Cheng Zhong Xinhui Lu Linna Zhu Shihe Yang Chuluo Yang Hubei Key Lab on Organic and Polymeric Optoelectronic Materials Department of Chemistry Wuhan University Wuhan 430072 P. R. China Shenzhen Key Laboratory of Polymer Science and Technology College of Materials Science and Engineering Shenzhen University Shenzhen 518060 P. R. China Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energy Faculty of Materials & Energy Southwest University Chongqing 400715 P. R. China Nano Science and Technology Program Department of Chemistry The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong P. R. China Department of Physics Chinese University of Hong Kong New Territories Hong Kong P. R. China Guangdong Key Lab of Nano-Micro Material Research School of Chemical Biology and Biotechnology Shenzhen Graduate School Peking University Xili University Town Shenzhen 518055 Guangdong P. R.China

Electron transport materials (ETM) play an important role in the improvement of efficiency and stability for inverted perovskite solar cells (PSCs). This work reports an efficient ETM, named PDI‐C 60 , by the combination of perylene diimide (PDI) and fullerene. Compared to the traditional PCBM, this strategy endows PDI‐C 60 with slightly shallower energy level and higher electron mobility. As a result, the device based on PDI‐C 60 as electron transport layer (ETL) achieves high power conversion efficiency (PCE) of 18.6 %, which is significantly higher than those of the control devices of PCBM (16.6 %) and PDI (13.8 %). The high PCE of the PDI‐C 60 ‐based device can be attributed to the more matching energy level with the perovskite, more efficient charge extraction, transport, and reduced recombination rate. To the best of our knowledge, the PCE of 18.6 % is the highest value in the PSCs using PDI derivatives as ETLs. Moreover, the device with PDI‐C 60 as ETL exhibits better device stability due to the stronger hydrophobic properties of PDI‐C 60 . The strategy using the PDI/fullerene hybrid provides insights for future molecular design of the efficient ETM for the inverted PSCs.

关键词： Elektronentransportmaterial Fullerene Perowskit-Solarzellen Perylendiimide Stromwandlungswirkungsgrad

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