Production of Flame-Retardant Nylon 6 and 6.6
Flame-retardant textiles are important constituents of various protective clothing, particularly for defense applications like clothing for nuclear-biological-chemical warfare, tank crew overalls, ...
Materials Literature
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dc-electric-field-induced microwave loss in ferroelectrics and intrinsic limitation for the quality factor of a tunable component
An effect of dc electric field on the intrinsic microwave loss in incipient ferroelectrics is theoretically studied. The contribution of the so-called field-induced quasi-Debye mechanism, which is related to the relaxation of phonon distribution function, is evaluated. It is found that the dc-field-induced loss is con…
Photodegradation and stabilization of styrene-butadiene-styrene rubber
Photooxidative degradation and stabilization of a polystyrene–block–polybutadiene–block–polystyrene thermoplastic elastomer using a polychromatic UV light in air at 60°C has been studied by monitoring the appearance of the hydroxyl and carbonyl groups in Fourier transform infrared spectroscopy. The extent of photooxid…
Photoalignment of Liquid Crystals by Liquid Crystals
We observed light-induced alignment of the nematic liquid crystal, 4, 4(')-n-pentylcyanobiphenyl (5CB), on a fused quartz. Irradiation of the adsorbed layer with polarized ultraviolet light produced homogeneous alignment in a 5CB-filled liquid crystal cell with the easy orientation axis perpendicular to the polarizati…
Strain-dependent vacuum annealing effects in La0.67Ca0.33MnO3−δ films
The effects of vacuum annealing on the structural and transport properties of the La0.67Ca0.33MnO3−δ films grown on SrTiO3 (LCMO/STO) and NdGaO3 (LCMO/NGO) substrates have been studied. A lattice expansion due to oxygen release during the annealing is observed. Under the same condition, the change of the out-of-plane…
Carbon black-reinforced dynamically cured EPDM/PP thermoplastic elastomers. I. Morphology, rheology, and dynamic mechanical properties
The structure development, rheological behavior, and viscoelastic properties of carbon black-filled dynamically vulcanized thermoplastic elastomers based on the ethylene–propylene–diene terpolymer (EPDM) and polypropylene (PP) with the ratio range of 50/50 to 80/20 were studied and compared with similar but unfilled s…
Natural Oil-Based Polymers: Opportunities and Challenges
The downstream plastic conversion industries have received a large boost and have mushroomed without a corresponding increase in the production of plastic raw materials in the world. There is a gre...
New avenues in x-ray microbeam experiments
The high brilliance of third-generation synchrotron radiation sources allows new applications in x-ray microdiffraction and microsmall-angle scattering. Beam sizes down to about one µm are routinely used and sub-µm beam sizes are becoming available. Scanning diffractometry can be used to examine samples like single fi…
Punctured polygons and polyominoes on the square lattice
We use the finite lattice method to count the number of punctured staircase and self-avoiding polygons with up to three holes on the square lattice. New or radically extended series have been derived for both the perimeter and area generating functions. We show that the critical point is unchanged by a finite number o…
Memory Effects in Granular Material
We present a combined experimental and theoretical study of memory effects in vibration-induced compaction of granular materials. In particular, the response of the system to an abrupt change in shaking intensity is measured. At short times after the perturbation a granular analog of aging in glasses is observed. Usin…
Propagation of Coulomb-correlated electron-hole pairs in semiconductors with correlated and anticorrelated disorder
Local ultrafast optical excitation of electron-hole pairs in disordered semiconductors provides the possibility to observe experimentally interaction-assisted propagation of correlated quantum particles in a disordered environment. In addition to the interaction driven delocalization known for the conventional single-…
Fractional Quantum Conductance in Carbon Nanotubes
Using a scattering technique based on a parametrized linear combination of atomic orbitals Hamiltonian, we calculate the ballistic quantum conductance of multiwall carbon nanotubes. We find that interwall interactions not only block some of the quantum conductance channels, but also redistribute the current nonuniform…
Thermal convection in fluidized granular systems
Thermal convection is observed in molecular dynamic simulation of a fluidized granular system of nearly elastic hard disks moving under gravity, inside a rectangular box. Boundaries introduce no shearing or time dependence, but the energy injection comes from a slip (shear-free) thermalizing base. The top wall is perf…
On depolarisation level shift in spherical QD
A giant level shift, resulted from the interaction of an electron in a spherical quantum dot with zero--point oscillations of confined modes of the electric field, is divulged. The energy correction depends on the dot radius. This size scaling of the depolarisation effect is computed semiclassically. A change of the o…
Numerical implementation of a shape memory alloy thermomechanical constitutive model using return mapping algorithms
Previous studies by the authors and their co-workers show that the structure of equations representing shape Memory Alloy (SMA) constitutive behaviour can be very similar to those of rate-independent plasticity models. For example, the Boyd–Lagoudas polynomial hardening model has a stress-elastic strain constitutive r…
Triangle-Programmed Coulometric Nanotitrations Completed by Continuous Flow with Potentiometric Detection
Coulometric nanotitrations were realized in a microchannel system using a continuous-flow titration technique with a triangle current-time profile. Redox and acid-base titrations were carried out on Fe(II) and nitric acid samples, respectively, with the same nanotitrator device. A linear relation between the concentra…
Lanthanide Doped V2O5/Al2O3 Catalysts: Structure−Activity Relationship in the SCR of NOx
The structure of lanthanide-doped (La, Sm, and Ce) V 2 O 5 /Al 2 O 3 catalysts for the Selective Catalytic Reduction (SCR) of NO x with NH 3 in the presence of O 2 have been studied by means of XRD, S BET, XAS, UV−vis, XPS, and TPR techniques. As function of the vanadium loading and lanthanide dopant used, an alterati…
Diameters of Single-Wall Carbon Nanotubes Depending on Helium Gas Pressure in an Arc Discharge
Diameter distributions of single-wall carbon nanotubes (SWNTs) produced by an arc discharge with a Rh−Pt catalyst at various helium pressures from 50 to 1520 Torr were studied by transmission electron microscopy and Raman scattering spectroscopy. The distribution shifted systematically to small diameter with the decre…
Bulk Reduction and Oxygen Migration in the Ceria-Based Oxides
Cubic solid solutions of general formula Ce 1 - x M x O 2 (M = Zr, Th, Hf) have been modeled in the range (0 < x < 1) using atomistic simulation methods. The Ce 4+ /Ce 3+ reduction energy in the bulk materials and the activation energy for oxygen migration have been calculated. The Ce 4+ /Ce 3+ reduction energy decrea…
Nanopattern Formation from Tethered PS-b-PMMA Brushes upon Treatment with Selective Solvents
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTNanopattern Formation from Tethered PS-b-PMMA Brushes upon Treatment with Selective SolventsBin Zhao, William J. Brittain, Wensheng Zhou, and Stephen Z. D. ChengView Author Information Department of Polymer Science The University of Akron, Akron, Ohio 44325-3909 Cite t…