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Wet-spinning of Regenerated Silk Fiber from Aqueous Silk Fibroin Solutions: Influence of Calcium Ion Addition in Spinning Dope on the Performance of Regenerated Silk Fiber

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Chinese Journal of Polymer science 2014年第1期32卷 29-34页

作者： Huan Zhou Zheng-zhong Shao 陈新 State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science Laboratory of Advanced Materials Fudan University

Ca（II） ions are added in the spinning dope to adjust the solidification rate of regenerated silk fibroin （RSF） solution during the wet-spinning process since Ca（II） ions are proved to be favorable to maintain the stable silk fibroin network in our previous work. The results show that when Ca（II）/RSF ratios are 1/50 and 1/20, the resulted RSF fibers exhibit good performance with the breaking energy more than 70 kJ/kg. However, higher Ca（II）/RSF ratio （for example, 1/10） hinders the solidification of spinning dope and results in poor RSF fibers. These observations together with earlier papers from this laboratory confirm that to produce tough silk fibers the spinning conditions must allow sufficient time for the adjustment of silk fibroin molecular chains.

关键词： Silk fiber Natural polymer Wet-spinning Protein Calcium.

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Titanium oxynitride thin films as high-capacity and high-rate anode materials for lithium-ion batteries

Titanium oxynitride thin films as high-capacity and high-rat...

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作者： Chiu, Kuo-Feng Su, Shih-Hsuan Leu, Hoang-Jyh Hsia, Chen-Hsien Department of Materials Science and Engineering Feng Chia University 100 Wenhwa Rd. Taichung40724 Taiwan Master's Program of Green Energy Science and Technology Feng Chia University 100 Wenhwa Rd. Taichung40724 Taiwan

Titanium oxynitride (TiOxNy) was synthesized by reactive magnetron sputtering in a mixed N2/O2/Ar gas at ambient temperature. TiOxNy thin films with various amounts of nitrogen contents were deposited by varying the N2/O2 ratios in the background gas. The synthesized TiOxNy films with different compositions (TiO1.837N0.060, TiO1.890N0.068, TiO1.865N0.073, and TiO1.882N0.163) all displayed anatase phase, except TiO1.882N0.163. The impedances and grain sizes showed obvious variations with the nitrogen contents. A wide potential window from 3.0 V to 0.05 V, high-rate charge-discharge testing, and long cycle testing were applied to investigate the performances of synthesized TiOxNy and pure TiO2 as anodes for lithium-ion batteries. These TiOxNy anodes can be cycled under high rates of 125 μA/cm2 (10 °C) because of the lower charge-transfer resistance compared with the TiO2 anode. At 10 °C the discharge capacity of the optimal TiOxNy composition is 1.5 times higher than that of pure TiO2. An unexpectedly large reversible capacity of ~ 300 μAh/cm2 μm (~ 800 mAh/g) between 1.0 V and 0.05 V was recorded for the TiOxNy anodes. The TiOxNy anode was cycled (3.0 V to 0.05 V) at 10 °C over 300 times without capacity fading while delivering a capacity of ~ 150 μAh/cm2 μm (~ 400 mAh/g). © 2015 Elsevier B.V. All rights reserved.

关键词： Thin films

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Biodegradable Polymeric Nanoparticles and Nanocapsules for Targeting Drug Delivery

Biodegradable Polymeric Nanoparticles and Nanocapsules for T...

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The 5th Asian Symposium on Emulsion Polymerization and Functional Polymeric Microspheres

作者： ChangChun Wang State Key Laboratory of Molecular Engineering of Polymers and Department of Macromolecular ScienceLaboratory of Advanced MaterialsFudan University

Cancer can affect various organs and occur in nearly every tissue in the body, which is one of the most challenging medical issues for handling [1]. The modern personal healthcare and pharmaceutical industries have raised some new concepts and requirements for the therapy of cancer, that is, it can be found at the early stages before the cancer metastasizes through the lymph systems and then the abnormal cells can be efficiently killed by chemotherapeutic agents [2, 3]. In this abstract, a preparation of biodegradable drug-loaded PMAA-PFH nanocapsules and the concept of ultrasound traced and triggered drug delivery system were described. Firstly, the uncrosslinked PMAA(u-PMAA) microspheres as the seeds were uniformlely coated with a new layer of disulfite-croslinked PMAA(d-PMAA) to form u-PMAA@d-PMAA core-shl sutrcture singby u distillation-precipitation polymerization. Secondly, the PMAA nanocapsules were prepared by dispersing u-PMAA@d-PMAA in ethanol to selectively dissolve u-PMAA. Thirdly, the anti-carcinogen DOX was loaded in shells of PMAA microbubbles through strong electrostatic interaction between the carboxyl groups of PMAA and the amino groups of DOX. Finally, the DOX-loaded PMAA nanocapsules were filled with the temperature sensitive perfluoropentane(PFH) in the inner cavities by a mild infusion procedure. When the PMAA-PFH nanocapsules were injected into animal vessel, the ultrasound energy could induce PFH into small bubbles to create strong imaging signal and increase the permeability of vessel to help drugs penetrate through vessel to tumor cells. While the nanocapsules entered cancer cells, the drug could be triggered and effectively released under ultrasound wave and glutathione(GSH) reduction condition. Meanwhile, the PMAA shells could be degraded into short polymer chains and release the loaded drug in the targeted cells. In comparison with previous reported ultrasound targeted drug release systems, our system has four advantages as following:(1)

关键词： Polymeric nanoparticles Biodegradable Drug carrier Glutathione

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Rücktitelbild: Chemical‐Bonding‐Directed Hierarchical Assembly of Nanoribbon‐Shaped Nanocomposites of Gold Nanorods and Poly(3‐hexylthiophene) (Angew. Chem. 30/2016)

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Angewandte Chemie 2016年第30期128卷

作者： Shuang Pan Luze He Juan Peng Feng Qiu Zhiqun Lin State Key Laboratory of Molecular Engineering of Polymers Collaborative Innovation Center of Polymers and Polymer Composite Materials Department of Macromolecular Science Fudan University Shanghai 200433 China School of Materials Science and Engineering Georgia Institute of Technology Atlanta GA 30332 USA

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Chemical‐Bonding‐Directed Hierarchical Assembly of Nanoribbon‐Shaped Nanocomposites of Gold Nanorods and Poly(3‐hexylthiophene)

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Angewandte Chemie 2016年第30期128卷

Nanoribbon‐shaped nanocomposites composed of conjugated polymer poly(3‐hexylthiophene) (P3HT) nanoribbons and plasmonic gold nanorods (AuNRs) were crafted by a co‐assembly of thiol‐terminated P3HT (P3HT‐SH) nanofibers with dodecanethiol‐coated AuNRs (AuNRs‐DDT). First, P3HT‐SH nanofibers were formed due to interchain π–π stacking. Upon the addition of AuNRs‐DDT, P3HT‐SH nanofibers were transformed into nanoribbons decorated with the aligned AuNRs on the surface (i.e., nanoribbon‐like P3HT/AuNRs nanocomposites). Depending on the surface coverage of the P3HT nanoribbons by AuNRs, these hierarchically assembled nanocomposites exhibited broadened and red‐shifted absorption bands of AuNRs in nIR region due to the plasmon coupling of adjacent aligned AuNRs and displayed quenched photoluminescence of P3HT. Such conjugated polymer/plasmonic nanorod nanocomposites may find applications in fields, such as building blocks for complex superstructures, optical biosensors, and optoelectronic devices.

关键词： Coaggregation Gold-Nanostäbchen Nanobänder Nanokomposite Poly(3-hexylthiophen)

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Accurate ab initio tight-binding Hamiltonians: Effective tools for electronic transport and optical spectroscopy from first principles

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Physical Review B 2016年第16期94卷 165166-165166页

作者： Pino D'Amico Luis Agapito Alessandra Catellani Alice Ruini Stefano Curtarolo Marco Fornari Marco Buongiorno Nardelli Arrigo Calzolari Dipartimento di Fisica Informatica e Matematica Universitá di Modena and Reggio Emilia Via Campi 213/a 41125 Modena Italy CNR-NANO Research Center S3 Via Campi 213/a 41125 Modena Italy Center for Materials Genomics Duke University Durham North Carolina 27708 USA Department of Physics University of North Texas Denton Texas 76203 USA Materials Science Electrical Engineering Physics and Chemistry Duke University Durham North Carolina 27708 USA Department of Physics Central Michigan University and Science of Advanced Materials Program Mt. Pleasant Michigan 48859 USA Department of Physics and Department of Chemistry University of North Texas Denton Texas 76203 USA

The calculations of electronic transport coefficients and optical properties require a very dense interpolation of the electronic band structure in reciprocal space that is computationally expensive and may have issues with band crossing and degeneracies. Capitalizing on a recently developed pseudoatomic orbital projection technique, we exploit the exact tight-binding representation of the first-principles electronic structure for the purposes of (i) providing an efficient strategy to explore the full band structure En(k), (ii) computing the momentum operator differentiating directly the Hamiltonian, and (iii) calculating the imaginary part of the dielectric function. This enables us to determine the Boltzmann transport coefficients and the optical properties within the independent particle approximation. In addition, the local nature of the tight-binding representation facilitates the calculation of the ballistic transport within the Landauer theory for systems with hundreds of atoms. In order to validate our approach we study the multivalley band structure of CoSb3 and a large core-shell nanowire using the ACBN0 functional. In CoSb3 we point the many band minima contributing to the electronic transport that enhance the thermoelectric properties; for the core-shell nanowire we identify possible mechanisms for photo-current generation and justify the presence of protected transport channels in the wire.

关键词： Ballistic transport Dielectric properties Electrical conductivity Electronic structure Transport phenomena Functional materials Nanowires Boltzmann theory Density functional theory High-throughput calculations Landauer formula Tight-binding model

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Photodetectors: A Broadband Fluorographene Photodetector (Adv. Mater. 22/2017)

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Advanced materials 2017年第22期29卷

作者： Sichao Du Wei Lu Ayaz Ali Pei Zhao Khurram Shehzad Hongwei Guo Lingling Ma Xuemei Liu Xiaodong Pi Peng Wang Hehai Fang Zhen Xu Chao Gao Yaping Dan Pingheng Tan Hongtao Wang Cheng‐Te Lin Jianyi Yang Shurong Dong Zhiyuan Cheng Erping Li Wenyan Yin Jikui Luo Bin Yu Tawfique Hasan Yang Xu Weida Hu Xiangfeng Duan College of Information Science and Electronic Engineering Zhejiang University Hangzhou Zhejiang 310027 China State Key Laboratory of Silicon Materials College of Material Science Zhejiang University Hangzhou Zhejiang 310027 China Institute of Applied Mechanics Zhejiang University Hangzhou Zhejiang 310027 China National Laboratory for Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai 200083 China MOE Key Laboratory of Macromolecular Synthesis and Functionalization Zhejiang University Hangzhou Zhejiang 310027 China University of Michigan ‐ Shanghai Jiao Tong University Joint Institute Shanghai Jiao Tong University Shanghai 200240 China State Key Laboratory of Superlattices and Microstructures Institute of Semiconductors Chinese Academy of Sciences Beijing 100083 China Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective Technologies Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo Zhejiang 315201 China College of Nanoscale Science and Engineering State University of New York New York NY 12203 USA Department of Engineering University of Cambridge Cambridge CB3 0FA UK Department of Chemistry and Biochemistry University of California Los Angeles CA 90095 USA

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Intrinsic Raman signatures of pristine hybrid perovskite CH3NH3PbI3 and its multiple stages of structure transformation

Intrinsic Raman signatures of pristine hybrid perovskite CH3...

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2016 IEEE 43rd Photovoltaic Specialists Conference (PVSC)

作者： Qiong Chen Henan Liu Hui-Seon Kim Yucheng Liu Mengjin Yang Naili Yue Gang Ren Kai Zhu Shengzhong Frank Liu Nam-Gyu Park Yong Zhang Department of Electrical and Computer Engineering The University of North Carolina at Charlotte Charlotte NC USA Optical Science and Engineering graduate program The University of North Carolina at Charlotte Charlotte NC USA Department of Energy Science Sungkyunkwan University Suwon South Korea National Ministry of Education Shaanxi Normal University Xi'an China Chemical and Materials Science Center National Renewable Energy Laboratory CO USA Molecular Foundry Lawrence Berkeley National Laboratory Berkeley CA USA Key Laboratory of Applied Surface and Colloid Chemistry National Ministry of Education Shaanxi Normal University Xi'an Shaanxi CN School of Chemical Engineering Sungkyunkwan University Suwon South Korea University of North Carolina at Charlotte Charlotte NC US

By performing spatially resolved Raman and photoluminescence spectroscopy with different illumination conditions, we have achieved a unified understanding towards the spectroscopy signatures of the organic-inorganic hybrid perovskite, transforming from the pristine state (CH 3 NH 3 PbI 3 or MAPbI 3 ) to fully degraded state (i.e., PbI 2 ), for samples with varying crystalline domain size from mesoscopic scale to macroscopic size, synthesized by three different techniques.

关键词： Measurement by laser beam Density measurement Chemistry Lighting Optical films Degradation Spectroscopy

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Facile fabrication of 3D layer-by-layer graphene-gold nanorod hybrid architecture for hydrogen peroxide based electrochemical biosensor

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Sensing and Bio-Sensing Research 2015年 3卷 7-11页

作者： Xue, Chenming Kung, Chih-Chien Gao, Min Liu, Chung-Chiun Dai, Liming Urbas, Augustine Li, Quan Kent State University Kent 44242 OH United States Department of Chemical Engineering Case Western Reserve University Cleveland 44106 OH United States Department of Macromolecular Science and Engineering Case Western Reserve University Cleveland 44106 OH United States Materials and Manufacturing Directorate Air Force Research Laboratory WPAFB 45433 OH United States

Three-dimensional (3D) layer-by-layer graphene-gold nanorod (GNR) architecture has been constructed. The resulting hybrid nanomaterials' architecture has been tested for detecting hydrogen peroxide (H₂O₂) through the electrocatalytic reaction on a three electrode disposable biosensor platform. Cyclic voltammetry and amperometry were used to characterize and assess the performance of the biosensor. The 3D layer-by-layer modified electrode exhibited the highest sensitivity compared to the active carbon, graphene-oxide, cysteine-graphene oxide and GNR coated electrodes. This research explored the feasibility of using the 3D hybrid graphene-GNR as a template for biosensor. The 3D hybrid structure exhibited higher sensitivity than GNRs alone. SEM showed the explanation that GNRs had self-aggregates reducing the contact surface area when coated on the active carbon electrode, while there were no such aggregates in the 3D structure, and TEM illustrated that GNRs dispersed well in the 3D structure. This research demonstrated a better way to prepare well-separated metal nanoparticles by using the 3D layer-by-layer structure. Consequently, other single and bi-metallic metal nanoparticles could be incorporated into such structure. As a practical example, 3D layer-by-layer nanomaterials modified active carbon electrode was used for detecting glucose showing very good sensitivity and minimum interference by ascorbic acid and uric acid in test solution, which indicated a good selectivity of the biosensor as well. © 2014 The Authors.

关键词： 3D hybrid nanostructure Biosensor Gold nanorod Graphene H2O2 detection

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Prospects for Detecting Single Vacancies by Quantitative Scanning Transmission Electron Microscopy

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Microscopy and Microanalysis 2015年第S3期21卷 1887-1888页

作者： Jie Feng Alexander V. Kvit Andrew B. Yankovich Chenyu Zhang Dane Morgan Paul M. Voyles Materials Science Program University of Wisconsin-Madison Madison WI 53706 USA Department of Materials Science and Engineering University of Wisconsin-Madison Madison WI 53706 USA

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