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Hu C.,Key Laboratory of Cluster Science | Song L.,Key Laboratory of Cluster Science | Zhang Z.,Key Laboratory of Cluster Science | Chen N.,Key Laboratory of Cluster Science | And 2 more authors.
Energy and Environmental Science

Graphene-based materials have shown great potential in various fields across physics, chemistry, biology, and electronics, due to their unique electronic properties, facile synthesis, and ease of functionalization. In this review, we summarize the significant advances in tailored graphene systems for the recently developed unconventional energy conversion and storage devices reported by our group and others, namely focused on their tunable and controllable preparation and remarkable applications in new types of supercapacitors, lithium ion batteries, photovoltaic cells, and other emerging generators. This featured article also highlights the working principles and outlines the problems hindering the practical applications of graphene-based materials in these energy-related devices. Future research trends towards new methodologies in the design and synthesis of graphene-based systems with unique properties for emerging energy storage and energy conversion devices are also proposed. © 2015 The Royal Society of Chemistry. Source

Du B.,Aerospace Research Institute of Materials And Processing Technology | Fang Z.,Zhejiang University
Polymer Degradation and Stability

Flame retardant mixtures of carbon nanotubes (CNTs) and intumescent flame retardant (IFR) were embedded in polypropylene (PP) to investigate what will happen if the additives exhibit two different flame retardation mechanisms. TEM tests showed that CNTs dispersed homogenously in PP matrix without any visible agglomeration. The effects of CNTs on thermal stability and flammability of PP were investigated by thermogravimetry (TG) and cone calorimetry tests, respectively. Results indicated that the introduction of CNTs only enhanced thermal stability of materials in a certain temperature range, but caused a severe deterioration of flame retardancy due to the interaction of the network structure and the intumescent carbonaceous char. Furthermore, conditions for an intumescent flame retardation system to behave with high efficiency were also discussed by a secondary combustion test. © 2011 Elsevier Ltd. All rights reserved. Source

Li Z.,Aerospace Research Institute of Materials And Processing Technology
Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica

Major advancement of TPS (Thermal Protection System) composites at home and aboard is briefly summarized, focusing on ablative TPS composites, non (minimal) ablative TPS composites, high-performance insulative composites and high-temperature microwave transparent composites. Breakthroughs and progress in our country are introduced, and the future development trends of thermal protection composites are discussed. Source

Ding H.-Y.,Aerospace Research Institute of Materials And Processing Technology
Hangkong Cailiao Xuebao/Journal of Aeronautical Materials

Multi-walled carbon nanotubes (MWCNTs) coated with Co and Co-Fe alloy ferromagnetic material is an ideal kind of light electromagnetic wave absorber. In this article, the influence of heat treatment on the electromagnetic properties of Co and Co-Fe coated MWCNTs was discussed. The surface composition and structure of Co and Co-Fe coated MWCNTs was characterized by field emission scanning electron microscope (FESEM), energy dispersive X-ray detector (EDX), X-ray diffractometer (XRD). Its electromagnetic properties were also measured. The results showed that the microwave absorbing property of Co and Co-Fe alloy coated MWCNTs in high frequencies was improved and the saturation magnetization increased while the coercivity decreased after heat treatment. Source

Gao Y.K.,Aerospace Research Institute of Materials And Processing Technology
Materials Science and Engineering A

The fatigue strength for 1×10 7 cycles of 7050-T7451 aluminum alloy was determined for machined, laser-peened, and shot-peened specimens. Moreover, fatigue lives were compared under the same load conditions. Results show that the laser peening induces a deeper compressive residual stress layer and better surface finish, therefore, it improves fatigue properties more effectively. Fractographic examination and analysis shows that the fatigue cracks initiate in the subsurface layer beneath the compressive residual stress field for laser- and shot-peened specimens, whereas the fatigue cracks form at surface for as-machined ones. © 2011 Elsevier B.V. Source

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