Materials Literature
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The role of long range dispersion forces plays a significant role in the adsorption of weakly chemisorbed molecules, as demonstrated by our first-principles calculations with the van der Waals density functional (vdW-DF) applied to the model system salicylic acid (SA) on the NaCl(001) surface. While the vdW interactio…
A novel simple method was developed to successfully synthesize biocompatible N-carboxyethylchitosan (NCECS) with a substitution degree of approx. 41% using the Michael addition reaction. The NCECS structure was characterized by Fourier transform infra-red spectrometry (FT-IR), (1)H-NMR, elemental analysis, X-ray diffr…
Abstract—A novel artificial transmission line with right/left-handed behavior is presented in this paper. The unit cell of the new artificial line consists of one series and one shunt wire bonded interdigital capacitors. When wire bonded interdigital capacitors are used, the artificial line has a wider frequency band…
Dropwise condensation has shown the ability to increase condensation heat transfer coefficients by an order of magnitude over filmwise condensation. In standard dropwise condensation, liquid droplets forming on a sub-cooled nonwetting surface are removed from the surface by gravitational forces when the droplets reach…
Two different distributions for the octahedral-site cations in ZnFe 2 O 4 and CdFe 2 O 4 are investigated by the first-principles method of density functional theory. Both the local density approximation (LDA) and the generalized gradient approximation (GGA) as well as the inclusion of the one-site Coulomb interaction…
The Hubbard model is used as a framework for analyzing carbon nanosystems: the fullerenes C 60 and C 80 and open-ended carbon nanotubes with chiralities (5, 5) and (10, 10) of various lengths. In the strong-correlation limit, the model predicts that open carbon nanotubes have a lower energy per atom as compared to C 6…
Organic-inorganic hybrid materials can be prepared dispersing organic species into well-defined inorganic nanoblocks. This paper describes the immobilization of natural dyes from the extract of the Brazilian açaí-fruit into two types of layered hexaniobate precursors derived from H(2)K(2)Nb(6)O(17): (i) colloidal disp…
In an effort to improve the fuel efficiency of automobiles, car designers are investigating new materials to reduce the overall automobile weight. Magnesium alloys are good candidates to achieve that weight reduction due in part to their low density. As part of a project on the interaction between forming and crashwor…
In a novel application a slab of S-shaped ring resonators is used in the form of an anisotropic uniaxial metamaterial with transversal negative effective permeability to fill a rectangular waveguide. Theory and experimental results show that the operational bandwidth of the dominant mode can be extended below the cuto…
Solvent induced single-crystal-to-single-crystal transformation has been demonstrated indicating the dynamic behavior of one dimensional arrays obtained from a self-assembled new synthetic cyclic peptide.
On undoped polycrystalline BaTiO(3-delta) (99.9% nominal purity), that had been equilibrated and quenched at 1000 degrees C under different oxygen activities in the range of -19.4 < or = log a(O(2)) < 0.1, were measured optical reflectance spectra at 298 K and ac conductivity at 473, 523 and 573 K, respectively. It wa…
Limitations on the physical realization of objects with point singularities in the refractive index are explored through transformation optics. Details of a lossless air/semiconductor composite structure for implementation of three structures are worked out.
Monodisperse crystalline ZnS hollow microspheres have been synthesized by employing an ethylenediamino-functionalized ordered mesoporous material which acts as a synthesis-directing agent. This new strategy implies the use of surface-modified ordered mesoporous silica spheres that chelate zinc ions and precisely orien…
An attempt to utilize a Co(II) cubane cluster as a building block to create extended frameworks results instead in the transformation of the cube into a dimer of dimers.
First principles density functional calculations were carried out for model compounds Ba12EuAl22Si10O66 and Sr12EuAl22Si10O66 to account for the luminescence properties of Eu2+ doped Ba13−xAl22−2xSi10+2xO66 and Eu2+ doped (Ba,Sr)13−xAl22−2xSi10+2xO66. Both host lattices have three different crystallographic alkaline e…
Bis(2-tetrathiafulvalenylethynylphenyl)ethynes la and 1b have been synthesized by the Sonogashira coupling reaction of 4-iodotetrathiafulvalenes with bis(2-ethynylphenyl)ethyne. The dimeric TTFs la and 1b form an open-chain anti conformation in the neutral and tetracation states, whereas la and 1b form a helical syn c…
Supercritical fluids (SCFs) are used for the preparation of size-controlled nanoparticles in micro- and meso-porous silicas with different pore sizes, CnFSM-16 (n = 8, 10, 12 and 16; pore diameter = 1.6–3.5 nm), where the value n denotes the carbon number in the alkyl chain of the surfactant template. Precursors, M(ac…
The corrosion rates of particulate 6092-T6 Al metal-matrix composites ͑MMCs͒ reinforced with 20 vol % B 4 C, SiC, and Al 2 O 3 as well as monolithic 6061-T6 Al immersed in American Society for Testing and Materials ͑ASTM͒ and real seawaters were lower than those immersed in 3.15 wt % NaCl or 0.5 M Na 2 SO 4 solutions.…
Thermochromic Ag(2)HgI(4) nanoparticles were prepared by rapid precipitation from aqueous solution. Stable colloids were formed by coating the particles with four different polymers, respectively. The four resulting systems of functionalised Ag(2)HgI(4) nanoparticles were characterised with respect to their polymer co…
The stability of the colored cyclized form of a compound from the new class of photochromic triangle terthiazoles was found to be strongly decreased by the presence of trifluoroacetic acid (TFA) in acetonitrile at room temperature. The apparent first-order process rate constant of the observed bleaching is of the same…