Materials Literature
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Abstract We present an ultrastructure-based revision (using light and electron microscopy) of the type species of the genus Cocconeis , C. scutellum var. scutellum , and four often-mentioned but poorly described, morphologically related varieties: C. scutellum var. baldjikiana , C. scutellum var. c linoraphis , C. scu…
We have recently suggested that suitably designed plasmonic layers may cloak a given object simultaneously at multiple frequencies (Alù and Engheta 2008 Phys. Rev. Lett. 100 113901). Here, we extend our theory and fully analyze this possibility, highlighting the potentials of this plasmonic cloaking technique and its…
Abstract Three series of composite films based on polyimide and MWNTs were prepared by conversion of pyromellitic dianhydride and 4,4′‐oxydianiline in the presence of the nanotubes, followed by thermal imidization. Carboxy‐ and amino‐functionalized as well as unmodified nanotubes were used. It was demonstrated that ju…
The novel crown-containing porphyrin 5-{4-[(4-hydroxybenzo-15-crown-5)-5-yldiazo]phenyl}-10,15,20-triphenylporphyrin (H 3 L) and its transition metal complexes MHL (M = Co(II), Ni(II), Cu(II), and Zn(II)) and AgH 2 L were obtained. The compositions and structures of all the compounds were studied by MALDI-TOF mass spe…
Abstract Next to the intended increase of the impact toughness, impact modification of polycarbonate generally results in an unwanted decrease in yield stress and time‐to‐failure under constant stress. It is demonstrated that this loss in strength can be fully compensated for by an annealing treatment, or by increasin…
The electrosynthesis process of conducting polymer on stainless steel was investigated and a two-step process was adopted to obtain polypyrrole (PPy) films at low potentials. The effects of applied potentials on the electrochemical, structural and protective properties of PPy films have been explored using scanning el…
The influence of micelle morphology transformation on the structure of mesoporous materials is fundamental in designing optimal, well-ordered, mesoporous materials. Firstly, the steady-state fluorescence technique was adopted to determine the first and second critical micelle concentrations of cetyltrimethylammonium c…
Jute—carbon and glass—carbon hybrid composites of mixed matrix material [epoxy resin of bisphenol-C (EBC) and bisphenol-C-formaldehyde (BCF) of 50 wt% of the fibers] have been prepared by hand lay-up technique at 150°C under 7.6MPa pressure for 2h. Alkali-treated jute fibers have been acrylated to improve their physic…
Full dielectric electromagnetic cloaks are studied in this paper for considering the possibility of achieving effective permeability gradients by taking advantage of a magnetic Mie resonance in high-κ ceramics. Extreme performance sensitivity to the dispersion of the complex effective parameters, which could be proble…
We consider cloaking by a coated cylindrical system using plasmonic resonance, and extend previous quasistatic treatments to include the effect of finite wavelength. We show that a probe cylinder can still be cloaked at finite wavelengths, but the cloaking cylinder develops a nonzero scattering cross section. We show…
In this study, poly(lactic acid) (PLA) and poly(vinyl alcohol) (PVA) blends, with PLA/PVA mass ratios of 100/0, 90/10, 80/20, 70/30, 60/40, 50/50, and 40/60, were prepared by means of the melt blending method. The result of torque measurements and thermal gravimtric analysis tests showed that the addition of PLA can d…
We demonstrate a promising route to fabricate large scale hexagonally patterned, vertically aligned ZnO nanorod arrays with small diameter. By adding 3-mercaptopropyltriethoxysilane (MPTES) molecules as a connection between catalyst and substrate the large size dispersion resulting from the removal of catalyst pattern…
In this paper, we introduce a generalized concept of field-transforming metamaterials, which perform field transformations defined as linear relations between the original and transformed fields. These artificial media change the fields in a prescribed fashion in the volume occupied by the medium. We show what electro…
The use of woven betel palm and kenaf lignocellulosic fibers as a reinforcing phase in unsaturated polyester was reported. The morphology, physical properties, and mechanical properties of the natural fibers and resulting woven composites were evaluated. Kenaf fibers exhibit higher tensile properties than betel palm f…
A series of Roussin's red salt esters [Fe(2)(micro-RS)(2)(NO)(4)] (R = n-Pr (), t-Bu (), 6-methyl-2-pyridyl () and 4,6-dimethyl-2-pyrimidyl ()) were synthesized by the reaction of Fe(NO)(2)(CO)(2) with thiols or thiolates. Complexes were characterized by IR, UV-vis, (1)H-NMR, electrochemistry, and single-crystal X-ray…
The magnetic properties and magnetocaloric effects in NaZn 13 -type La 1− x Pr x Fe 10.7 Co 0.8 Si 1.5 compounds have been investigated. Partially replacing La with Pr leads to a small reduction in the Curie temperature T C due to the lattice contraction, but the values of T C for La 1− x Pr x Fe 10.7 Co 0.8 Si 1.5 ar…
In this paper, we present the design of an electromagnetic cloaking device working for both transverse electric (TE) and transverse magnetic (TM) polarizations. The theoretical approach to cloaking used here is inspired by the one presented by Alù and Engheta (2005 Phys. Rev. E 72 016623) for TM polarization. The case…
In an attempt to identify novel magnetic refrigerant materials, we have studied the magnetic and magnetocaloric properties in RNi compounds with R = Gd, Ho and Er. GdNi is a simple ferromagnet with a collinear structure in contrast to HoNi and ErNi, in which the moments of rare earth sublattice are arranged non-collin…
Correlations between spall damage and local microstructure were investigated in multicrystalline copper samples via impact tests conducted with laser-driven plates at low pressures (2—6 GPa). The copper samples had a large grain size as compared to the thickness, which was either 200 or 1000 μm, to isolate the effects…
Starting from the Luneberg lens index profile, we apply the transformation design method to the problem of far-field imaging of (infinitely) distant objects. This analysis yields a single element lens with a planar image surface, zero aberrations of all orders, zero F-number and (in some cases) constant aperture for a…