Papers by Keyword: Nanomaterial

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Authors: Manish Srivastava, Ashok Kumar Das, Partha Khanra, Nam Hoon Kim, Joong Hee Lee
Abstract: Graphene/CeO2 nanocomposite has been successfully prepared by directly growing CeO2 nanoparticles on graphene sheets via in-situ reduction of graphene oxide containing the metal precursor. The presence of cetyltrimethyl ammonium bromide (CTAB) results the formation of CeO2 nanoparticles with a narrow size distribution. The structural, morphological, particles size and optical properties of the synthesized products were investigated through X-ray diffraction (XRD), transmission electron microscopy (TEM), fourier transform infrared spectroscopy (FT-IR) and UVvis absorbance spectroscopy, respectively. The XRD pattern shows that graphene/CeO2 nanocomposite is highly crystalline in nature. Growth of CeO2 nanoparticles with size in range of 5-18 nm on the graphene sheet were observed by TEM measurement. Optical energy band gap was calculated to be ~3.30 eV corresponding to direct transition. The catalytic activity of the synthesized nanocomposite was investigated taking hydrazine hydrate as a model system. Significant enhancement in the peak current with respect to CeO2 was observed on graphene/CeO2 nanocomposite-based electrode demonstrating the higher catalytic activity of graphene/CeO2 nanocomposite-based electrode.
Authors: Guo Qing Zhong, Qin Zhong, Hong Liang Zhou, Yu Qing Jia
Abstract: The Co–B alloy can be prepared facilely by a solid-solid reaction of CoCl2•6H2O and KBH4 powders at room temperature. Various characterizations, such as the chemical analysis, inductively coupled plasma-atomic emission spectroscopy (ICP), powder X-ray diffraction, electron diffraction and TEM have been performed. The results indicate that the Co-B alloy obtained by the solid-solid reaction is amorphous nanoparticles. The composition of the alloy is Co1.36B. The average diameter of the Co–B alloy nanoparticles is 30nm–50nm. The room temperature solid-solid reaction is mainly a surface reaction. The direct solid solid reaction between the borohydride and some metal-salts is thermodynamically possible. This simple preparation method may also be used for the large-scale production of the amorphous nanoparticles of some metal-boron alloys.
Authors: Yu Mei Xiao, Hui Chuan Zhao, Hong Song Fan, Xin Lin Wang, L.K. Guo, Xu Dong Li, Xing Dong Zhang
Abstract: A composite of needle-like nano-hydroxyapatite (n-HA)/poly (D,L) lactide (PDLLA) was prepared. The n-HA crystals were poorly crystallized and uniformly distributed in the composite with a crystal size of 10–20 nm in diameter by 40–60nm in length,which was smaller than that of pure nano-HA. Molecular interactions and chemical bonds might present between n-HA and PDLLA in the composite, which were revealed by IR and XPS. The synthetic n-HA/PDLLA composite had a good homogeneity and could be a bioactive material for bone defect especially for load-bearing bone repair, which is more potential than pure HA or pure PDLLA.
Authors: Zhu Ge Yan
Abstract: This paper will provide a review of the current research on the material characterisation and mechanical behaviour of polymer enhanced silica aerogels. Aerogels have been in existence for many years; however, the engineering applications of aerogels have been limited due to their poor mechanical behaviour. Recently a new type of polymer enhanced silica aerogel, a nanostructured form of silica has been developed. The new material is having a low density, very low thermal conductivity, excellent acoustic insulation and high mechanical which makes it ideal for energy efficient building material. This paper will discuss the start-of-the-art development of this material and issues to apply the material in energy efficient buildings.
Authors: Jiang Wei, Jian Xiong Liu, Yu Chun Dang, Kun Xu, Yi Zhou
Abstract: TiO2 has large potential ability in Lithium-ion batteries due to its high energy density and safety. The main reasons that limit the performance of TiO2 electrode is its low real capacity which caused by poor conductivity and other factors. Varying bulk TiO2 materials to nanoscale is believed a promising method as it could increase Li insertion sites, short the ions diffusion distance and enhance the kinetics. In addition, doping heterogeneous elements or compositing other conductivity materials could enable TiO2 to improve electron transfer ability. In this paper, we reviewed the electrochemical performance of some nanostructured TiO2 and analyzed the merits and weaknesses. Some challenges and perspectives for future research were also discussed.
Authors: Oli Ahamed, Fahad bin Mazhar, Md Rasedujjaman
Abstract: Biosensor is a device that detects any change in physical parameter of biological elements in physicochemical manner and transfers its output in electrical manner. Nanotechnology is playing an emerging role in the development of biosensors and carbon nanotube is the leading one in this developing field. Carbon nanotube has an excellent combination of mechanical, electrical and electrochemical properties that has stimulated increasing interest in the application of CNTs as component in biosensors. This paper provides a review of analytical modeling of biosensors on the basis of carbon nanotube.
Authors: Xiao Li Wang, Xu Han, Shi Jun Yu
Abstract: Recently, many research efforts have been devoted to developing new strategies for fabricating oxide nanomaterials owing to their widespread potential applications. In this article we review the current research activities on the fabrication of inorganic oxide nanomaterials. The application of oxide nanostructured materials in the field of lithium ion batteries will be obtained in the mainly parts of paper.
Authors: Hyoun Woo Kim, Ju Hyun Myung, S.H. Shim
Abstract: We have synthesized gallium oxide (Ga2O3) nanomaterials at two different growth temperatures on iridium (Ir)-coated substrates by thermal evaporation of GaN powders. The products consist mainly of nanobelts, with some additional nanosheets. The nanobelts were of a single-crystalline monoclinic Ga2O3 structure. The broad emission photoluminescence band of 900°C-products had a different peak position from that of the 970°C-products.
Authors: A.F.M. Fadzil, F.H. Muhammad
Abstract: LiMn1.5Fe0.5O4 is synthesized using sol-gel method and annealed at 850°C for 24 hours. It is then characterized using X-ray diffraction (XRD) and charge discharge analysis. The bulk material are then proceed to further grinding to become nanosize. The nanosample is then characterized using XRD and charge discharge performance, and the specific capacities of the two materials are compared. nanosample of LiMn1.5Fe0.5O4 shows higher specific capacity which is 160.16 mAhg-1 compares to the bulk which gives only 128.663mAhg-1. This shows that with smaller particle size, the battery performance has improved in terms of its capacity.
Authors: Jhun Iuan Kuo, Hsien Ming Jeng
Abstract: Facing the international trend for pursuit of sustainable development in 21st century, and the high performance nanocoating that is environment protective and sustainable become the new trend of building materials. This study focused on the features of nanomaterials in domains such as the integration of construction management, material science and nanotechnology in order to improve the hydrophobic property of the current architectural coatings, to enhance the performance of the building and to develop the water-proof coating that is friendly to the environments.
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