Journal of Nanoscience and Nanotechnology (J NANOSCI NANOTECHNO)

Publications in this journal

• Article: Al3+ ions dependent structural and magnetic properties of Co-Ni nano-alloys

  R. H. Kadam, A. P. Birajdar, Anil S. Gaikwad, Sagar E. Shirsath
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  ABSTRACT: Ferrite samples with a chemical formula Co0�5Ni0�5AlxFe2−xO4 (where x = 0�0, 0.25, 0.5, 0.75 and 1.0) were synthesized by sol–gel auto-combustion method. The synthesized samples were annealed at 600 �C for 4 h. An analysis of X-ray diffraction (XRD) patterns reveals the formation of single phase cubicspinel structure. The lattice parameter decreased linearly with the increasing Al content x. Nano size of the powders were confirmed by the transmission electron micrographs (TEM). Particle size, bulk density decreased whereas specific surface area and porosity of the samples increased with the Al substitution. Cation distribution of constituent ions shows linear dependence of Al substitution. Based on the cation distribution obtained from XRD data, structural parameters such as lattice parameters, ionic radii of available sites and the oxygen parameter ‘u’ is calculated. Saturation magnetization (Ms), magneton number (nB� and coercivity (Hc) decreased with the Al substitution. Possible explanation for the observed structural and magnetic behavior with various Al content are discussed.
  Journal of Nanoscience and Nanotechnology 10/2013; 13(10).
• Article: Interaction between ketoconazole and human serum albumin on epoxy modified magnetic nanoparticles for drug delivery

  E. MALTAS, M. OZMEN, B. YILDIRIMER, S. KUCUKKOLBASI, S. YILDIZ
  Journal of Nanoscience and Nanotechnology 09/2013; 13.
• Article: Preparation of Silver Nanoparticles by a Non-Aqueous Sol-Gel Process

  Christophe T.G. Petit, Muath S.A. Alsulaiman, Rong Lan, Gregory Mann, Shanwen Tao
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  ABSTRACT: Using a non-aqueous sol-gel process with a direct calcination step in air after prior drying, silver nanoparticles with average size distribution ranging from 20 to 100 nm were synthesised. Studies in reduced atmosphere were also performed with mixed results, both in phase and particle size, as the samples were found to be mixed with an amorphous phase. In oxidising atmosphere, the temperature and dwelling time were found to be critical factors with the former playing a larger role than the latter. Optimally nanoparticles of silver are best prepared by direct calcination in air of the precursor gel at 250 °C for 1 hour. Compared to silver particles prepared by microemulsions, the particle size is larger due to the thermal treatment, which causes a growth of the silver particles.
  Journal of Nanoscience and Nanotechnology 08/2013; 13(8):5445.
• Article: Platinum and Palladium Nano-Structured Catalysts for Polymer Electrolyte Fuel Cells and Direct Methanol Fuel Cells

  Nguyen Viet Long, Masayuki Nogami, Yang Yong
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  ABSTRACT: In this review, we present the synthesis and characterization of Pt, Pd, Pt based bimetallic and multi-metallic nanoparticles with mixture, alloy and core-shell structure for nano-catalysis, energy conversion, and fuel cells. Here, Pt and Pd nanoparticles with modified nanostructures can be controllably synthesized via chemistry and physics for their uses as electro-catalysts. The cheap base metal catalysts can be studied in the relationship of crystal structure, size, morphology, shape, and composition for new catalysts with low cost. Thus, Pt based alloy and core-shell catalysts can be prepared with the thin Pt and Pt-Pd shell, which are proposed in low and high temperature proton exchange membrane fuel cells (PEMFCs), and direct methanol fuel cells (DMFCs). We also present the survey of the preparation of Pt and Pd based catalysts for the better catalytic activity, high durability, and stability. The structural transformations, quantum-size effects, and characterization of Pt and Pd based catalysts in the size ranges of 30 nm (1-30 nm) are presented in electro-catalysis. In the size range of 10 nm (1-10 nm), the pure Pt catalyst shows very large surface area for electro-catalysis. To achieve homogeneous size distribution, the shaped synthesis of the polyhedral Pt nanoparticles is presented. The new concept of shaping specific shapes and morphologies in the entire nano-scale from nano to micro, such as polyhedral, cube, octahedra, tetrahedra, bar, rod, and others of the nanoparticles is proposed, especially for noble and cheap metals. The uniform Pt based nanosystems of surface structure, internal structure, shape, and morphology in the nanosized ranges are very crucial to next fuel cells. Finally, the modifications of Pt and Pd based catalysts of alloy, core-shell, and mixture structures lead to find high catalytic activity, durability, and stability for nano-catalysis, energy conversion, fuel cells, especially the next large-scale commercialization of next PEMFCs, and DMFCs.
  Journal of Nanoscience and Nanotechnology 07/2013; 13(7):4799-4824 (26).
• Article: Electrospinning of polyaniline: effect of different raw sources

  P. Frontera, C. Busacca, S. Trocino, P.L. Antonucci, M. Lo Faro, E. Falletta, C. Della Pina, M. Rossi
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  ABSTRACT: Nanofibers of conducting polymers, as polyaniline (PANI), have received a great deal of attention by the scientific community for their potential applications (electronic, magnetic, biomedical, optical fields). Recently the electrospinning has emerged as a promising technique to produce wires and fibers of polymers with diameters ranging from 10 nm to 10 μm. PANI shows poor processability by electrospinning due to its low solubility in common solvents. However, it is possible to spin polyaniline nanofibers adding another polymer to the organic solutions, generally an insulator, necessary to increase the viscosity of the polymeric solution to be spun. Unfortunately, the presence of an insulator copolymer decreases the fibers conductivity. The key factor to obtain fibers of good quality (high conductivity and a narrow distribution of the diameters) is to reduce the amount of insulator copolymer in the spun process. Accordingly, we prepared raw PANI following different synthetic methods to be compared, aiming at the best optimized protocol in terms of easy solubility and enhanced spinning behavior of the polymers achieved. All the materials have been characterized by FT-IR and UV-VIS spectroscopies. The spun samples obtained have been characterized by SEM to evaluate the fiber morphology and complex impedance spectroscopy (EIS) in order to measure the electrical conductivity.
  Journal of Nanoscience and Nanotechnology 07/2013; 13(7):4744-4751.
• Article: The Influence of Non-Solvent Addition on the Independent and Dependent Parameters in Roller Electrospinning of Polyurethane

  Funda Cengiz Çallıoğlu, Oldrich Jirsak, Mehmet Dayık
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  ABSTRACT: This paper discusses the effects of 1,1,2,2 tetrachlorethylen (TCE) non-solvent addition on the independent (electrical conductivity, dielectric constant, surface tension and the rheological properties of the solution etc.) and dependent parameters (number of Taylor cones per square meter (NTC/m2�, spinning performance for one Taylor cone (SP/TC), total spinning performance (SP), fiber properties such as diameter, diameter uniformity, non-fibrous area) in roller electrospinning of polyurethane (PU). The same process parameters (voltage, distance of the electrodes, humidity, etc.) were applied for all solutions during the spinning process. According to the results, the effect of TCE non-solvent concentration on the dielectric constant, surface tension, rheological properties of the solution and also spinning performance was important statistically. Beside these results, TCE non-solvent concentration effects quality of fiber and nano web structure. Generally high fiber density, low non-fibrous percentage and uniform nanofibers were obtained from fiber morphology analyses.
  Journal of Nanoscience and Nanotechnology 07/2013; 13(1-9).
• Article: Wetting and Surface Energy of Vertically Aligned Silicon Nanowires

  S. Jana, S. Mondal, S.R. Bhattacharyya
  Journal of Nanoscience and Nanotechnology 06/2013;
• Article: Structural Properties, Interface Modes and Magnetophonon Resonances in the Double Quantum Well Structure

  D. Ploch, T. Plocinski, W. Gebicki, E. M. Sheregii, K. J. Kurzydlowski
  Journal of Nanoscience and Nanotechnology 06/2013; 13(6):4025.
• Article: Sub-Micronic Capsules Based on Gelatin and Poly(maleic anhydride-alt-vinyl acetate) Obtained by Interfacial Condensation with Potential Biomedical Applications

  Delia Mihaela Iurea (Rata, Catalina Anisoara Peptu, Jean-François Chailan, Pascal Carriere, Marcel Popa
  Journal of Nanoscience and Nanotechnology 06/2013; 13:3841-3850.
• Article: Preparation, Characterization and Biocatalytic Activity of a Nanoconjugate of Alpha Amylase and Silver Nanoparticles

  Abhijeet Mishra, Razi Ahmad, Veena Singh, Munishwar Nath Gupta, Meryam Sardar
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  ABSTRACT: The primary challenge in developing nanoparticle based enzymatic devices is to be able to chemically immobilize an enzyme, which will retain its activity or improve its function while being attached to the nanoparticle. This would be of even greater significance if the whole process could be performed under benign conditions without having to resort to functionalization of key molecules at various steps. In the present study the conjugates of amylase and silver nanoparticles were synthesized using neem leaf extract as the reducing and stabilizing agent. The silver nanoparticles were characterized using Surface Plasmon Resonance Spectra, Dynamic Light Spectroscopy (DLS), Fourier Transform Infrared Spectroscopy (FTIR), Circular Dichroism (CD) and Surface Tunneling Microscopy (STM). The silver nanoparticles retained 85% amylase activity. The nanobiocatalyst was further characterized in terms of kinetic parameters and thermal stability. It was thermally more stable as compared to the free alpha amylase enzyme.
  Journal of Nanoscience and Nanotechnology 05/2013; 13:5028-5033.
• Article: Enhanced Performance of a Microbial Fuel Cell Using CNT/MnO2 Nanocomposites as a Bioanode Materials

  S. Kalathil, N. V. Hoa, J. J. Shim, Mohammad Mansoob Khan, J. Lee, M. H. Cho
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  ABSTRACT: The anode electrode material is a crucial factor for the overall performance of a microbial fuel cell (MFC). In this study, a plain carbon paper modified with the CNT/MnO2 nanocomposite was used as the anode for the MFC and a mixed culture inoculum was used as the biocatalyst. The modified anode showed better electrochemical performance than that of plain carbon paper, and Brunauer Emmett Teller (BET) analysis showed the high surface area (94.6 m2/g) of the composite. The Mn4+ in the nanocomposite may enhance the electron transfer between the microorganisms and the anode material which facilitates electron conduction. Additionally, MnO2 can be used to store electrons due to its supercapacitance, which is comparable to that of the cytochromes present in the outer cell membranes of electrochemically active microorganisms. The MFC with a modified anode produced a maximum power density of 120±1�7 mW/m2, while the corresponding current density was 0�262±0�015 A/m2 at an external resistor of 800�with an open circuit voltage (OCV) of 1�07±0�02 V. The unusually high OCV may be attributed to the high charge density developed on the bioanode by the charge accumulation in the MnO2 of the bioanode. This study showed that the CNT/MnO2 nanocomposite can be an excellent anode material for MFC.
  Journal of Nanoscience and Nanotechnology 05/2013;
• Article: DNA engineered tri-functional Ni-Au nano-chain: Understanding of its formation and novel magnetic properties

  Madhuri Mandal, Debasish Sarkar, Bipul Das, Pradip Das, Kalyan Mandal
  Journal of Nanoscience and Nanotechnology 04/2013;