spectroscopy Articles

  • Determination of the mechanism behind the organic magnetoresistance (OMAR) effect by using impedance spectroscopy

    We investigated the organic magnetoresistance (OMAR) mechanism in poly(3–hexylthiophene–2,5–diyl) (P3HT)–based diodes, by using impedance spectroscopy. We have prepared layered structures consisting of indium tin oxide, poly(3,4–ethylenedioxythiophene):poly(styrenesulphonate) (PEDOT:PSS), P3HT and aluminium and measured the bias voltage dependence of the OMAR and of the impedance spectra. The ...


    By Inderscience Publishers

  • Application of surface complexation models to anion adsorption by natural materials

    Various chemical models of ion adsorption will be presented and discussed. Chemical models, such as surface complexation models, provide a molecular description of anion adsorption reactions using an equilibrium approach. Two such models, the constant capacitance model and the triple layer model will be described. Characteristics common to all the surface complexation models are equilibrium ...


    By John Wiley & Sons, Ltd.

  • Microstructural study of thermally treated reactor pressure vessel steels using spectroscopic methods

    Positron annihilation spectroscopy (lifetime and Doppler broadening techniques), transmission Mössbauer spectroscopy, integral low-energy electron Mössbauer spectroscopy and transmission electron microscopy were applied to examine thermally treated reactor pressure vessel steels (RPV). The results of these methods obtained for different types of steels are discussed and correlated with hardness ...


    By Inderscience Publishers

  • Fundamental studies in nanosciences at the Institute of Electronics, Microelectronics, and Nanotechnology (IEMN)

    This paper gives an overview over the fundamental research in nanosciences at the Institute of Electronics, Microelectronics and Nanotechnology (IEMN). We present some highlights from the numerical simulation of the electronic structure of nanowires and nanotubes, the charge spectroscopy of Si nanoparticles and C nanotubes, the scanning tunnelling spectroscopy of semiconductor quantum dots, to ...


    By Inderscience Publishers

  • Bulk viscosity and compressibility measurement using acoustic spectroscopy

    Bulk viscosity is a somewhat obscure parameter that appears in the hydrodynamic equations for Newtonian liquids when compressibility is important and, together with the dynamic viscosity, controls sound attenuation. Whereas dynamic viscosity reflects only “translational” molecular motion, in contrast the bulk viscosity reflects the relaxation of ...


    By Dispersion Technology Inc.

  • Effects of deformation and physical aging on nano-scale free volumes in polycarbonate studied by positron annihilation lifetime spectroscopy

    Positron annihilation lifetime spectroscopy (PALS) has been employed to measure the variation of free volume hole parameters in poly(carbonate) (PC) after plastic deformation below the glass transition temperature (Tg). Changes in nano-scale free volume holes (Vh) and in their fraction (%fv) due to plane-strain and uniaxial compression and aging time were investigated at temperatures below Tg. ...


    By Inderscience Publishers

  • Nanometric metal wire as a guide for THz investigation of living cells

    The development of microsystems as tools for nanotechnology is strongly observed in the case of Biological MicroElectroMechanical Systems (BioMEMS). A part of them aim at the characterisation of biomolecules in solutions or in biological entities such as living cells. THz spectroscopy could provide interesting new complementary information at the systemic biology due to its faculty to probe the ...


    By Inderscience Publishers

  • Spectroscopic analysis of boron porphyrin complexes

    Spectroscopic analyses of diboron porphyrin complexes have been performed using femtosecond transient absorption spectroscopy, fluorescence spectroscopy measurements, IR and Raman spectroscopy as well as DFT and TDDFT calculations. Transient absorption spectroscopy was used to study the dynamics of the transient species by exciting the molecule with a ~100 fs pulse of light at the wavelength ...


    By Inderscience Publishers

  • Nanoparticles and nanowires: synchrotron spectroscopy studies

    This paper reviews the research in nanomaterials conducted in our laboratory in the last decade using conventional and synchrotron radiation techniques. While preparative and conventional characterisation techniques are described, emphasis is placed on the analysis of nanomaterials using synchrotron radiation. Materials of primary interests are metal nanoparticles and semiconductor nanowires and ...


    By Inderscience Publishers

  • Catalyst characterisation of Fe-doped-titanium dioxide

    Fe (5 wt. %) doped TiO2 was synthesised using a hydrothermal method. This material was characterised by X-Ray diffraction (XRD), Raman spectroscopy, scanning electron microscope (SEM) imaging, BET surface area, X-Ray photoelectron spectroscopy (XPS) and ultraviolet-visible diffuse reflectance spectroscopy (UV-vis DRS). The BET surface area was 136 m²/g and crystal sizes of 1.6 microns. SEM ...


    By Inderscience Publishers

  • FT-IR spectroscopy as a tool for identification of apoptosis-induced structural changes in A549 cells treated with PM 701

    Fourier transform infrared (FTIR) spectroscopy has been found useful for detecting apoptotic changes induced in human lung cancer cells (A549) that treated with PM 701 (natural product) in tissue culture level. Characteristic bands alterations were identified in the apoptotic cells arising from cellular protein, lipid and DNA, there were specific changes that affected the secondary structure of ...


    By Inderscience Publishers

  • Characterization of interaction between tricyclic structures containing pharmaceuticals, their models and humic substances

    Their persistence and wide consumption identify pharmaceuticals as “emerging pollutants”. The complexation of pharmaceuticals containing adamantine ring structures and their model substances with humic acids (HA) of different origins was compared using fluorescence spectroscopy as a function of pH, humic acid concentration, ionic strength, and molecular mass of HA. Binding constants between the ...


    By IWA Publishing

  • PyTrA: ultra–fast transient absorption data analysis software

    Ultra–fast transient absorption spectra are inherently complex data sets to process. PyTrA is a new software system that has been written to bring together many of the most well–known techniques of analysis into one easy–to–use package. Figure of publishable quality can be generated, and advanced 3D graphs can be used to view the transient data in new ways. PyTrA is the first ultrafast transient ...


    By Inderscience Publishers

  • Investigation of Ge/Si quantum dot structures using the methods of admittance spectroscopy

    In this paper the properties of multilayer p–i–n–structures based on Si with Ge quantum dots fabricated by molecular beam epitaxy were investigated using the method of admittance spectroscopy at temperatures from 10 K to 300 K. The results of experimental research for two types of structures are presented. The activation energies of the emission process from localised states are ...


    By Inderscience Publishers

  • Raman spectroscopy in biomedicine – non-invasive in vitro analysis of cells and extracellular matrix components in tissues

    Raman spectroscopy is an established laser-based technology for the quality assurance of pharmaceutical products. Over the past few years, Raman spectroscopy has become a powerful diagnostic tool in the life sciences. Raman spectra allow assessment of the overall molecular constitution of biological samples, based on specific signals from proteins, nucleic acids, lipids, carbohydrates, and ...


    By AcuTech Scientific Inc.

  • Rotating angled plate diffusing wave spectroscopy

    Solid–like non–ergodic samples can be difficult to study using standard single speckle diffusing wave spectroscopy as the measurement may lack requisite ensemble averaging. We demonstrate here that this required ensemble averaging can be induced by translating the speckle over the collection optics so that multiple speckles are observed over the duration of the experiment. Translation is achieved ...


    By Inderscience Publishers

  • Covalently-bound organic monolayers for biosensor applications

    In this paper, we present a detailed investigation on monolayer formation with thicknesses amounting 1 nm to 3 nm on silicon and silicon nitride surfaces. Thermal and photochemical methods are successfully used to form such stable and densely backed monolayers. Further, functionalisation of these surfaces with activated esters, amine groups are also presented. Static water contact angle ...


    By Inderscience Publishers

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