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Unraveling the Interfacial Charge Migration Pathway at the Atomic Level in a Highly Efficient Z‐Scheme Photocatalyst

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Angewandte Chemie 2019年第33期131卷

作者： Pengfei Wang Yueshuang Mao Lina Li Zhurui Shen Xiao Luo Kaifeng Wu Pengfei An Haitao Wang Lina Su Yi Li Sihui Zhan MOE Key Laboratory of Pollution Processes and Environmental Criteria Tianjin Key Laboratory of Environmental Remediation and Pollution Control College of Environmental Science and Engineering Nankai University Tianjin 300350 P. R. China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Shanghai 201800 P. R. China School of Materials Science and Engineering Nankai University Tianjin 300350 P. R. China State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 P. R. China Beijing Synchrotron Radiation Facility Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 P. R. China Department of Chemistry Tianjin University Tianjin 300072 P. R. China

A highly efficient Z‐scheme photocatalytic system constructed with 1D CdS and 2D CoS 2 exhibited high photocatalytic hydrogen‐evolution activity of 5.54 mmol h −1 g −1 with an apparent quantum efficiency of 10.2 % at 420 nm. More importantly, its interfacial charge migration pathway was unraveled: The electrons are efficiently transferred from CdS to CoS 2 through a transition atomic layer connected by Co–S 5.8 coordination, thus resulting in more photogenerated carriers participating in surface reactions. Furthermore, the charge‐trapping and charge‐transfer processes were investigated by transient absorption spectroscopy, which gave an estimated charge‐separation yield of approximately 91.5 % and a charge‐separated‐state lifetime of approximately (5.2±0.5) ns in CdS/CoS 2 . This study elucidates the key role of interfacial atomic layers in heterojunctions and will facilitate the development of more efficient Z‐scheme photocatalytic systems.

关键词： Direkte Z-Schema-Photokatalysatoren Heteroübergänge Ladungsmigration Photokatalyse Schnittstellen

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Laser Processing of Metal Oxides: Laser Irradiation of Metal Oxide Films and Nanostructures: Applications and Advances (Adv. Mater. 14/2018)

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Advanced materials 2018年第14期30卷

作者： Haribabu Palneedi Jung Hwan Park Deepam Maurya Mahesh Peddigari Geon‐Tae Hwang Venkateswarlu Annapureddy Jong‐Woo Kim Jong‐Jin Choi Byung‐Dong Hahn Shashank Priya Keon Jae Lee Jungho Ryu Functional Ceramics Group Korea Institute of Materials Science (KIMS) Changwon 51508 Republic of Korea Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon 34141 Republic of Korea Bio‐inspired Materials and Devices Laboratory (BMDL) Center for Energy Harvesting Materials and Systems (CEHMS) Virginia Tech Blacksburg VA 24061 USA CSIR‐National Physical Laboratory Dr. K. S. Krishnan Road New Delhi 110012 India

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Bacteriorhodopsin‐Inspired Light‐Driven Artificial Molecule Motors for Transmembrane Mass Transportation

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Angewandte Chemie 2018年第51期130卷

作者： Ganhua Xie Pei Li Zhiju Zhao Xiang‐Yu Kong Zhen Zhang Kai Xiao Huanting Wang Liping Wen Lei Jiang CAS Key Laboratory of Bio-inspired Materials and Interfacial Science Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 P. R. China Key Laboratory of Green Printing Institute of Chemistry Chinese Academy of Sciences Beijing 100190 P. R. China College of Chemical Engineering and Biotechnology Xingtai University Xingtai 054001 P. R. China Department of Chemical Engineering Monash University Clayton Victoria 3800 Australia University of Chinese Academy of Sciences Beijing 100049 P. R. China

In nature, biological machines and motors can selectively transport cargoes across the lipid membranes to efficiently perform various physiological functions via ion channels or ion pumps. It is interesting and challengeable to develop artificial motors and machines of nanodimensions to controllably regulate mass transport in compartmentalized systems. In this work, we show a system of artificial molecular motors that uses light energy to perform transmembrane molecule transport through synthetical nanochannels. After functionalizing the polymer nanochannels with azobenzene derivatives, these nanomachines exhibit autonomous selective transport behavior over a long distance upon simultaneous irradiation with UV (365 nm) and visible (430 nm) light. With new strategies or suitable materials for directed molecular movement, such device can be regarded as a precursor of artificial light‐driven molecular pumps.

关键词： Lichtgetriebene Prozesse Molekulare Motoren Nanokanäle Photoisomerisierungen Stofftransport

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Immobilisation of cyclodextrin glucanotransferase into polyvinyl alcohol (PVA) nanofibres via electrospinning

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biotechnology Reports 2016年 10卷 44-48页

作者： Saallah, Suryani Naim, M. Nazli Lenggoro, I. Wuled Mokhtar, Mohd Noriznan Abu Bakar, Noor Fitrah Gen, Masao Graduate School of Bio-Applications and Systems Engineering Tokyo University of Agriculture and Technology 2-24-16 Nakacho Koganei Tokyo 184-8588 Japan Biotechnology Research Institute Universiti Malaysia Sabah Kota Kinabalu Sabah 88400 Malaysia Department of Process and Food Engineering Faculty of Engineering Universiti Putra Malaysia Serdang Selangor 43400 Malaysia Department of Chemical Engineering Tokyo University of Agriculture and Technology 2-24-16 Nakacho Koganei Tokyo 184-8588 Japan Faculty of Chemical Engineering Universiti Teknologi MARA Shah Alam Selangor 40450 Malaysia Advanced Institute for Materials Research Tohoku University 2-1-1 Katahira Aoba-ku Sendai 980-8577 Japan

Immobilisation of cyclodextrin glucanotransferase (CGTase) on nanofibres was demonstrated. CGTase solution (1% v/v) and PVA (8 wt%) solution were mixed followed by electrospinning (-9 kV, 3 h). CGTase/PVA nanofibres with an average diameter of 176 ± 46 nm were successfully produced. The nanofibres that consist of immobilised CGTase were crosslinked with glutaraldehyde vapour. A CGTase/PVA film made up from the same mixture and treated the same way was used as a control experiment. The immobilised CGTase on nanofibres showed superior performance with nearly a 2.5 fold higher enzyme loading and 31% higher enzyme activity in comparison with the film. © 2016 Elsevier B.V. All rights reserved.

关键词： CGTase Cyclodextrins Electrospinning Immobilisation Nanofibres

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Generalized integrated interleaving BCH codes

Generalized integrated interleaving BCH codes

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IEEE International Symposium on Information Theory

作者： Yingquan Wu Department of Engineering University Campus Bio-Medico of Rome Unit of Computer Systems and Bioinformatics Italy Laboratory of Sciences and Techniques of Automatic control and computer engineering (Lab-STA) University of Sfax Sfax Tunisia

ISBN: (纸本)9781509018079

Tang and Koetter proposed generalized integrated interleaved Reed-Solomon codes in which each code of the second layer belongs to different subcode of the first layer code. However, the original scheme is inapplicable to binary BCH codes since its integrating coefficients are general finite field elements. In this work we propose a novel generalized integrated interleaving scheme over binary BCH codes, derive a lower bound on the minimum distance, and further present an algebraic encoding and decoding algorithm.

关键词： Encoding Decoding Redundancy Systematics Generators Power demand

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Atomically Dispersed Precious Metal Species on Various Oxide Supports for Catalytic Hydrogen Upgrading and Emission control

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Microscopy and Microanalysis 2016年第S3期22卷 858-859页

作者： Ming Yang Lawrence F. Allard Maria Flytzani-Stephanopoulos Department of Chemical and Biological Engineering Tufts University Medford MA 02155 USA Chemical and Materials Systems Laboratory General Motors Global Research and Development Warren MI 48090 USA Materials Science &Technology Div. Oak Ridge National Laboratory Oak Ridge TN 37831 USA

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Investigation of the Effect of Internal Pores Distribution on the Elastic Properties of Closed-Cell Aluminum Foam: A Comparison with Cancellous Bone

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Procedia Structural Integrity 2016年 2卷 1285-1294页

作者： M.J. Mirzaali F. Libonati P. Vena V. Mussi L. Vergani M. Strano Department of Mechanical Engineering Politecnico di Milano Via La Masa 1 Milano 20156 Italy Department of Chemistry Materials and Chemical Engineering "G. Natta" Politecnico di Milano Via La Masa 1 Milano 20156 Italy Machine Tools and Production Systems-MUSP Laboratory Via Tirotti 9 Piacenza 29122 Italy

Closed-cell aluminum foams belong to the class of cellular solid materials, which have wide application in automotive and aerospace industries. Improving the mechanical properties and modifying the manufacturing process of such materials is always on demand. It has been shown that the mechanical properties of cellular materials are highly depending on geometrical arrangement, mechanical properties of solid constituents and the relative density of these materials. In this study, using a manufacturing process of foaming by expansion of a blowing agent, we prepared two types of closed-cell aluminum foams with isotropic distribution of cells along length and foams with gradient of pores along its length. We hypothesized that such variation of pores can induce microstructural directionality along the length of foam samples and improve their mechanical properties. For this aim, we studied the microstructural properties by micro-CT imaging and found their relation to macroscopic mechanical properties of foam samples by conducting monotonic compression tests. We compared these results with the one of the bovine femur trabecular bone as they show a dominant microstructural anisotropy due to alignment with the maximum strength direction in body. We also conducted numerical analyses and validated them for the elastic part based on our experimental work. Our results showed that gradient variation in porosity in closed-cell aluminum foams have a minor effect on their macroscopic mechanical properties. Although using such materials in sandwich panel structures, the strength of the material slightly increased. In addition, parameters of a power law model for the description of mechanical properties of foam sample and their relative density and properties of the solid compartment were characterized. The presented results are considered as a preliminary study for improvement of mechanical properties of closed-cell aluminum foams.

关键词： Closed-cell Aluminum Foam bio-inspiration Microstructural Anisotropy Finite Element Modeling Computed Tomography

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control on a molecular scale: A perspective

Control on a molecular scale: A perspective

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American control Conference

作者： Rolf Findeisen Martha A. Grover Christian Wagner Michael Maiworm Ruslan Temirov F. Stefan Tautz Murti V. Salapaka Srinivasa Salapaka Richard D. Braatz S.O. Reza Moheimani Otto-von-Guericke-Universit?t Magdeburg Laboratory for Systems Theory and Automatic Control Germany School of Chemical & Biomolecular Engineering Georgia Institute of Technology USA Peter Gruenberg Institute (PGI-3) Juelich Research Center Germany Electrical and Computer Engineering Department University of Minnesota USA Massachusetts Institute of Technology USA Department of Mechanical Engineering The University of Texas at Dalla USA

ISBN: (纸本)9781467386838

Imaging and manipulating objects down to the molecular level plays a crucial role in many disciplines. It allows to unravel molecular phenomena, to form materials with new chemical and physical properties, or to build objects on an atomic scale. Science on the nanoscale is inherently interdisciplinary. It requires knowledge and insight into many fields, spanning from modeling, measuring, imaging, actuation to control. Often feedback control facilitates operation with molecular precision, despite the fact that many physical phenomena at the molecular level are still not well understood, and that stochastic and nonlinear effects are inherently present. This work provides an insight into some of the current control related research activities on a molecular scale. This is done considering examples from different fields: control related to scanning probe microscopy such as atomic force microscopy, controlled self assembly on a molecular scale, control aspects of molecular transport, and the use of control for manipulation of single molecules using macroscopic probe tips. The hope is that control related researchers, who are not experts in these fields, become aware of the opportunities present, which could also drive new theoretical developments.

关键词： Computational modeling Mathematical model Force Atomic force microscopy Numerical models Computational modeling Atomic Force Microscopy numerical models Mathematical Model Force Standing Orders Scale formation Insight Transport Process Physical Phenomena Scanning Probe Microscopy Hopefulness Research Activities chemical and physical properties feedback control

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Thin Films: 3D Orientational control in Self-Assembled Thin Films with Sub-5 nm Features by Light (Small 33/2017)

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Small 2017年第33期13卷

作者： Koen Nickmans Gerardus M. Bögels Carlos Sánchez-Somolinos Jeffrey N. Murphy Philippe Leclère Ilja K. Voets Albertus P. H. J. Schenning Laboratory of Functional Organic Materials and Devices Department of Chemical Engineering and Chemistry Eindhoven University of Technology P.O. Box 513 5600 MB Eindhoven The Netherlands Departamento de Física de la Materia Condensada Instituto de Ciencia de Materiales de Aragón (ICMA) CSIC-Universidad de Zaragoza 50009 Zaragoza Spain Laboratory for Chemistry of Novel Materials Center for Innovation and Research in Materials and Polymers (CIRMAP) University of Mons (UMONS) Place du Parc 20 B 7000 Mons Belgium Institute for Complex Molecular Systems Eindhoven University of Technology 5600 MB Eindhoven The Netherlands Laboratory of Macromolecular and Organic Chemistry Department of Chemical Engineering and Chemistry Eindhoven University of Technology 5600 MB Eindhoven The Netherlands Laboratory of Physical Chemistry Department of Chemical Engineering and Chemistry Eindhoven University of Technology 5600 MB Eindhoven The Netherlands

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Few‐Layer Black Phosphorus Nanosheets as Electrocatalysts for Highly Efficient Oxygen Evolution Reaction

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Advanced Energy materials 2017年第19期7卷

作者： Xiaohui Ren Jie Zhou Xiang Qi Yundan Liu Zongyu Huang Zhongjun Li Yanqi Ge Sathish Chander Dhanabalan Joice Sophia Ponraj Shuangyin Wang Jianxin Zhong Han Zhang Hunan Key Laboratory of Micro‐Nano Energy Materials and Devices Laboratory for Quantum Engineering and Micro‐Nano Energy Technology School of Physics and Optoelectronic Xiangtan University Xiangtan 411105 P. R. China Shenzhen Engineering Laboratory of Phosphorene and Optoelectronics SZU‐NUS Collaborative Innovation Center for Optoelectronic Science and Technology and Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province Shenzhen University Shenzhen 518060 P. R. China Department of Nanoscience and Technology Bharathiar University Coimbatore 641046 India State Key Laboratory of Chem/Bio‐Sensing and Chemometrics College of Chemistry and Chemical Engineering Hunan University Changsha 410082 P. R. China

Black phosphorus (BP) is a new rediscovered layered material, which has attracted enormous interests in the field of electrocatalysis. Recent investigations reveal that bulk BP is a promising electrocatalyst for oxygen evolution reactions (OER), whereas its bulk crystal structure restricts sufficient active sites for achieving highly efficient OER catalytic performances. Toward this end, few‐layer BP nanosheets prepared by facile liquid exfoliation are applied as electrocatalysts and exhibit preferable electrocatalytic OER activity in association with structural robustness; subsequently, the dependence of current density and applied bias potential on the concentration of OH − has also been uncovered. Most importantly, we are aware that reduction in the thickness of BP nanosheets would generate extra active sites from the ultrathin planar structure and complimenting to the electrocatalytic activities. It is further anticipated that the current work might provide further implementation about the OER performance of BP nanosheets, thereby, offering extendable availabilities for BP‐based electrocatalysts in constructing high‐performance OER devices.

关键词： 2D black phosphorus oxygen evolution reaction (OER)

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