Papers by Keyword: Aqueous Solution

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Authors: Azlinda Ab Aziz, Zuraida Khusaimi, Saifollah Abdullah, Mohamad Rusop Mahmood
Abstract: ZnO nanorods were prepared by immersion method deposited onto Silicon (Si) and gold-seeded Si (Au/Si) substrate. The annealing temperatures were varied from 400, 500 and 600 °C. The effect of annealing temperature on the surface morphology and photoluminescence characteristics was investigated. The samples were characterized by Field Emission Scanning Electron Microscope (FESEM) to study their morphology and structural properties while the optical properties were characterized at room temperature using Photoluminescence Spectroscope. The shape of ZnO showed growth of nanorods with hexagonal shape. As the annealing temperature increased, the morphology study indicates that particle size of ZnO decreased while the crystallinity increases. The structures has high surface area, is a potential metal oxide nanostructures to be develop for optoelectronic devices and chemical sensors.
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Authors: Naoshi Ozawa, Yoshihiro Ideta, Takeshi Yao, Tadashi Kokubo
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Authors: Naoshi Ozawa, Yoshihiro Ideta, Takeshi Yao, Tadashi Kokubo
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Authors: Jun Huang, Xiao Jing Lv, Mi Ouyang, Bin Hu, Cheng Zhang
Abstract: Single-crystalline ZnO nanotubes were fabricated via a simple aqueous solution method under low temperature and atmospheric pressure conditions. X-ray powder diffraction (XRD), field-emission scanning electron microscopy (FE-SEM) and high-resolution transmission electron microscopy (HR-TEM) equipped with the selected area electron diffraction (SAED) setup were used to analyze the crystal structure, surface morphology and inner structure of ZnO nanotubes. Photoluminescence (PL) and UV-visible absorption spectra were carried out to investigate optical properties of ZnO nanotubes. The results indicate ZnO nanotubes only exhibit sharp and strong near ultraviolet emission at 363 nm according to PL spectrum.
189
Authors: Manickam Minakshi, Pritam Singh, Melody Carter
Abstract: The redox behavior and surface characterization of manganese dioxide (MnO2) containing titanium boride (TiB2) as a cathode and Zn as an anode have been investigated in aqueous saturated lithium hydroxide (LiOH) electrolyte battery. The electrode reaction of MnO2 with TiB2 in this aqueous electrolyte is shown to be lithium insertion rather than the usual protonation. The influence of TiB2 additive (1, 3 and 5 wt. %) on the performance of MnO2 as a cathode and its cycling ability have been determined.
159
Authors: Arash Rezaei, Ali Shokuhfar, M. Asadi, M.M. Hosseinzadeh, Shahram Ahmadi
Abstract: In this study, diffused carbon in workpiece surface with Plasma Electrolysis Carburizing (PEC) treatment applied to harden SAE 1015 steel is investigated. The workpiece is connected cathodically to a high current DC power supply that applies high voltage and uses stainless steel as the anode. After water ionization with this voltage, a hydrogen film forms around the workpiece. This film acts as a thermal and electrical insulation layer which increases the electric resistance around the workpiece and makes it being heated. The surface of the workpiece is transformed to austenite and after the disconnection of the current, the workpiece is quenched in aqueous solution. By the aid of this method, the workpiece can be hardened to 1200HV or more. In this paper, the effect of time and solution concentration on the depth of diffused carbon was studied. The hardness of workpiece was measured and the variation of the diffusion depth versus time and solution concentration was investigated.
26
Authors: Hidero Unuma
Abstract: This paper reviews novel techniques developed in our laboratory to deposit ceramic thin films from aqueous solutions. All the techniques are based on the heterogeneous nucleation and growth phenomenon; ceramic precipitates are prone to be formed preferentially on substrate/solution interfaces when the rate of the formation of the precipitates is appropriately controlled. In “oxidative soak coating” method, metal ions with a lower valence state are oxidized in homogeneous solutions to those with a higher valence state; thereby coatings of SnO2, MnO2, CeO2, Co3O4 and Fe3O4 have been deposited. In “ligand decomposition” method, ligands of an indium peroxo- complex are decomposed to promote spontaneous hydrolysis of the indium ion; thereby In2O3 coating has been deposited. In “enzyme-assisted precipitation” method, precipitant of metal ions is supplied by urease immobilized on a substrate to promote local deposition of ceramics on the substrate, by which hydroxyapatite coating has been rapidly deposited. The control of the rate of the precipitation reactions is the most important parameter. Some properties of the resultant coatings are also presented.
527
Authors: Volodymyr Khomenko, Kostiantyn Lykhnytskyi, Viacheslav Barsukov, Vitalii Chaban
Abstract: Electrochemical properties and possibilities of manufacturing the anodes based on water-soluble binders such as carboxymethylcellulose (CMC) have been investigated in order to create prerequisites for development of “green” technologies for recyclability of LIBs components.In this work an advanced anode was designed. A kind of nanosized carbon coated Si composite was synthesized. The charge/discharge test reveals that the advanced anode shows a reversible capacity of 600 mAh/g. The improved performance was ascribed to the carbon shell of Si and CMC binder. The binder CMC buffers the expansion of the Si and the improved electric contact between the active material and copper current collector.
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Authors: Koji Sato, Daisuke Onodera, Mitsuhiro Hibino, Takeshi Yao
Abstract: Poly methyl methacrylate(PMMA) with mar resistant or poly ethtylene(PE) substrates were surface-treated by applying plasma discharge or alkaline solution. Ceramic thin film comprised of silicon oxide, titanium oxide and zirconium oxide was formed on these surface treated substrates respectively from an aqueous solution, and after the formation of ceramic thin film, titanium oxide thin film was also coated on them from aqueous solution at ordinary temperature and pressure. The thin film coated polymer material was tested in mechanical property. The thin film was hard and the adhesion strength to the organic polymer substrate was very high. The substrate was soaked in SBF and apatite was formed on the substrate. This method is promising for developing hard and soft tissue implants with various mechanical properties as well as high bioactivity.
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Authors: Ana C.F. Ribeiro, Cecilia Isabel A.V Santos, Victor M.M. Lobo, Artur J.M. Valente, Pedro M.R.A. Prazeres, Hugh D. Burrows
Abstract: Binary mutual diffusion coefficients have been measured for aqueous solutions of some carbohydrates (glucose, fructose, lactose, sucrose, α-cyclodextrin and β- cyclodextrin) at concentrations from 0.002 mol dm-3 to 0.010 mol dm-3. The concentration dependence of the diffusion coefficients at physiological temperature, 37 °C, is discussed on the basis of their structures.
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