Materials Literature
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Humidity sensors have multi-walled carbon nanotubes (MWNTs) as the sensing material is demonstrated. The sensor was fabricated on a silicon dioxide coated silicon wafer with metal electrodes. MWNTs were deposited and interlinked with the electrodes by means of the dielectrophoresis technique. The sensing device has th…
The adsorption and thermal evolution of ethene (ethylene) on clean and oxygen precovered Ni(111) was investigated with high resolution x-ray photoelectron spectroscopy using synchrotron radiation at BESSY II. The high resolution spectra allow to unequivocally identify the local environment of individual carbon atoms.…
A giant low-frequency dielectric constant (∼10 5 ) has been observed in room temperature stabilized cubic zirconia nanocrystal of size range 4–8 nm. Dielectric constant strongly depends on the crystallite size. Electrical behaviour of nanocrystallites has been described by an equivalent circuit to obtain grain and gra…
The new compound SrNp(PO(4))(2) (orthorhombic Cmca) has been synthesized by a solid-state reaction and its crystal structure solved ab initio and refined by Rietveld analysis. Though chemically and structurally related to the cheralite CaTh(PO(4))(2), SrNp(PO(4))(2) shows alternate layers of SrO(10) and NpO(8) polyhed…
Synthesis and characterization of a novel bio-nanocomposite based on chitosan, waterborne polyurethane and modified nanosilica is reported. In order to disperse of silica nanoparticles, fumed nanosilica was modified using γ-glycidoxypropyltrimethoxysilane (GPTS). Characterization of synthesized bio-nanocomposite was p…
We employ an ab initio calculation based on density functional theory to investigate the ideal strength of face-centered cubic crystal Au under uniaxial stress along the [100] direction. We show that the stability of the perfect Au crystal under tensile stress is determined by the tetragonal shear stiffness modulus, w…
Low density polyethylene (LDPE)/modified water hyacinth fiber (WHF) composites have been prepared by melt blending. All the composites were characterized by tensile test, differential scanning calorimetry (DSC), water absorption behaviour, thermogravimetric analysis (TGA) and scanning electron microscopy (SEM). The re…
In this paper we discuss the stability behavior of spherical polyelectrolyte brushes (SPB) in the presence of trivalent lanthanum counterions. Stability behavior is measured through the rate of coagulation of the SPB as a function of the lanthanum concentration using simultaneous static and dynamic light scattering. A…
Structure and thermodynamics of the recently discovered two polymorphs of Y(BH 4 ) 3 are investigated by first-principles calculation. Simulated X-ray and neutron diffraction patterns combined with structure analysis from first principles enable us to assign a space group Fm 3̅ c to the high-temperature polymorph amon…
The process of coherent creation of particle-hole excitations by an electric field in graphene is quantitatively described using a dynamic ``first-quantized'' approach. We calculate the evolution of current density, number of pairs, and energy in ballistic regime using the tight-binding model. The series in electric f…
Partition coefficients, K i,F/P, between liquids or food simulants, F, and amorphous regions of polymers, P, are important quantities to predict the sorption or desorption kinetics in various areas and in particular to predict the contamination of food by substances originating from food contact materials. This work e…
The influence of Fe3+ as an example of an impurity on the crystallization of ammonium sulfate as an example of an inorganic compound is discussed based on theory and experiments. The metastable zone width was increased up to 4.5 times by 100 ppm of impurity but the effect seems to level out at higher Fe3+ concentratio…
We report measurements of energy spectra of secondary electrons emitted from clean and cesiated aluminum surfaces under the impact of 130 eV electrons. Measurements show that the decay of bulk and surface plasmons dominates the electron emission. In contrast with theoretical calculations, our experiments indicate that…
Läuft wie geschmiert: Moleküldynamikrechnungen ergaben, dass sich der Cluster B19− wie ein molekularer Wankel-Motor verhält (siehe Vergleichsbild), in dem zwei konzentrische Borringe gegeneinander rotieren. Aufgrund der geringen Rotationsbarriere bleibt der Cluster während der Drehbewegung vollständig eben.
Abstract A new method to recover NH 4 Cl from NH 4 Cl‐rich aqueous solutions generated in the magnesia (MgO) production is developed on the basis of modeling the solid–liquid equilibrium (SLE) for the NH 4 Cl‐MgCl 2 ‐H 2 O system with the Pitzer model embedded in Aspen Plus™ platform. The SLE values for the ternary sy…
The electronic structure of genomic DNA has been comprehensively characterized by synchrotron-based X-ray absorption and X-ray photoelectron spectroscopy. Both unoccupied and occupied states close to the Fermi level have been unveiled and attributed to particular sites within the DNA structure. A semiconductor-like el…
This work investigates the formation of photoluminescence centres in high-transmission glass (HTG) doped with Cu(2)O and their capability to transform the solar spectrum by absorption/emission via Stokes-shifted PL into a more efficient spectrum for photovoltaic applications. Among the centres formed in HTG, both gree…
The presence of defects in carbon nanotubes strongly modifies their electrical, mechanical, and chemical properties. It was long thought undesirable, but recent experiments have shown that introduction of structural defects using ion or electron irradiation can lead to novel nanodevices. We demonstrate a method for de…
Abstract Improvements in Young's modulus and strength (tenacity) of poly(ethylene terephthalate) (PET) fibers were obtained by drawing unoriented nanocomposite filaments containing low concentrations (<3 wt%) of various organically modified montmorillonites (MMTs) in a second step at temperatures above the glass tr…
Low-dimensional α-Mn2O3 materials with novel surface morphologies have been prepared by thermal decomposition of hydrothermal-derived MnCO3. The powder X-ray diffraction pattern reveals that the Mn2O3 microstructures are of cubic phase structure. From Fourier transform infrared spectroscopy results, the peaks around 6…