Materials Literature
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Abstract The structure and thermal behavior of poly(lactic acid) (PLA) multifilament yarns were studied by complementary techniques of differential scanning calorimetry (DSC), Fourier transform infrared (FTIR) spectroscopy, and wide angle X‐ray diffraction (WAXD). As for PLA filaments, notable differences in the WAXD…
A method to design isotropic inhomogeneous refractive index distribution is presented, in which the scalar wave field solutions propagate exactly on an eikonal function (i.e., remaining constant on the Geometrical Optics wavefronts). This method is applied to the design of "dipole lenses", which perfectly focus a scal…
Light scattering in an axially symmetric composite system of a nanoparticle, an oscillating dipole and a metal film (covering a dielectric support) is considered. Nanoparticle and dipole are placed on the axis of symmetry. The axially oriented dipole is situated between film and nanoparticle. The field-enhancement fac…
An investigation on the electronic and magnetic properties of NiAs-type CrTe and CrSe has been performed for ferromagnetic, antiferromagnetic and non-collinear spin configurations, using the spin-polarized relativistic KKR (Korringa-Kohn-Rostoker) band structure method. Calculated exchange coupling parameters, as well…
Fabrication and characterization of the miniature device of waveguide grating-structures (WGS) on the end facet of an optical fiber are demonstrated. A layer of ZnO between the fiber and the grating structures serves as the waveguide. The fiber is used to direct the excitation light to the WGS and to carry the signal…
The aim of this study was to develop methoxy poly(ethylene oxide)-b-poly(epsilon-caprolactone) (MePEO-b-PCL) containing stearyl (St) substituents on PCL, and assess the efficacy of nanocarriers formed from this structure in comparison to unmodified MePEO-b-PCL and those with carboxyl substitutes on PCL on the solubili…
We investigated the influence of the core diameter, shell thickness, and ligand length on the spectroscopic and electrochemical signature of CdSe-ZnS core−shell quantum dots and on the ability of these nanoparticles to exchange electrons with complementary acceptors or donors upon excitation. Our studies demonstrate t…
Abstract This study is an effort to modify conventional batch processes to be able to produce polymeric foams with high cell density and small cell size, which cannot be reached by conventional batch foaming processes. This has been attained by controlling the foaming temperature and controlled stabilization of the ce…
Abstract This paper presents a review of our recent work on capacitance of carbide‐derived carbons (CDCs). Specific capacitance as high as 14 μF cm –2 or 160 F g –1 was achieved using CDCs with tailored subnanometer pore size, which is significantly higher than 6 μF cm –2 or 100 F g –1 for conventional activated carbo…
The (LaBa)Co2O5+δ thin films were grown on (001) SrTiO3 single crystal substrates by using pulsed laser deposition. Microstructure studies from x-ray diffraction and electron microscopy show that the films have good epitaxial quality with a-axis orientation and sharp atomic interface. Transport property and isothermal…
We achieve a broadband unidirectional transmission or One-way diffraction grating by cascading two parallel gratings made of isotropic material with different periods. In order to significantly reduce the reciprocal transmission of the zero order, one of them is chosen to be a subwavelength grating and designed as a w…
Abstract Composites were prepared with chemically modified banana fibers in polypropylene (PP). The effects of 40‐mm fiber loading and resin modification on the physical, mechanical, thermal, and morphological properties of the composites were evaluated with scanning electron microscopy (SEM), thermogravimetric analys…
A new class of bulk metamaterials is proposed, which are assembled of functional layers with differing layout properties, as shown in the figure. These enhanced degrees of freedom allow to design metamaterials, which perform optically in a predefined manner. We apply this approach to design isotropic metamaterials and…
Carbon nanotubes coated with alginic acid (AA) through noncovalent functionalization have been shown to be soluble and dispersed in water. In the present contribution, all-atom molecular dynamics simulations have been performed to probe the self-assembly mechanism that underlies the formation of complexes by AA and a…
Abstract Electrospinning of Polyamide 6 (PA 6) in 2,2,2‐trifluoroethanol (TFE) was investigated for the fabrication of nanofibrous nonwoven membranes useful for separation systems. The effects of solution characteristics such as concentration and conductivity as well as the effects of processing conditions such as rel…
Abstract With the increasing interest in environmental and health issues, legal restrictions, such as European Union (EU) End of Life Vehicle Directives, were strengthened. This led us to incorporate nano zinc oxide (nano‐ZnO), with particle sizes of 30–40 nm and specific surface areas of 25.0–50.0 m 2 /g, instead of…
Abstract Homopolymers of aniline, toluidines and their copolymers were synthesized by chemical oxidative polymerization using different ratios of monomers in the feed in H 2 SO 4 medium. The synthesized polymers were characterized by employing Fourier transform infrared, UV‐visible, proton nuclear magnetic resonance,…
This article presents test data, analysis and computed results for gold rods impacting silicon carbide targets. This work focuses on the dwell phenomenon, but also investigates the penetration response. Experiments are presented for several target configurations including targets that use a small diameter copper buffe…
The distribution of an ionic liquid within microphase-separated domains of a block copolymer in mixtures of the two components is studied using contrast-matched small-angle neutron scattering (SANS) and differential scanning calorimetry (DSC). In concentrated mixtures of a poly(styrene- block -2-vinyl pyridine) (S2VP)…
Solid solutions of BaTiO3 ferroelectric ceramics containing Sn2+ ions have been synthesized by solid state reaction with Ca2+ codoping. The crystal structures of Sn2+ ions doped (Ba,Ca)TiO3 were identified as tetragonal perovskite type BaTiO3 based on x-ray diffraction profiles analysis. (Ba1−xCax)TiO3 (x=0.13) tetrag…