Materials Literature
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Density functional molecular cluster calculations have been used to investigate the interaction of SO(2) with defect-free TiO(2)(110) and Ti(2)O(3)(102) surfaces. Adsorbate geometries and chemisorption enthalpies have been computed and discussed. Several local minima have been found for TiO(2)(110), but only one seems…
In this paper, for the first time, we study the properties of a superconductive-based left-handed transmission line (SLHTL). The effect of the kinetic inductance on the propagation constant of the left-handed transmission line is analyzed. It is shown that increasing the kinetic inductance decreases both the bragg fre…
Realizou-se o inventário florístico das diatomáceas pertencentes às classes Coscinodiscophyceae e Fragilariophyceae de rios da bacia hidrográfica Litorânea do Paraná. Amostras planctônicas e perifíticas foram coletadas em dezembro/1998, e em fevereiro e julho/2000 em nove rios: Iporanga, Nhundiaquara, do Nunes, Cachoe…
The electrochemical potentiokinetic reactivation (EPR) test is commonly used to evaluate the degree of sensitization of austenitic stainless steels. It is shown in this study that the EPR test can be used to distinguish between classical sensitization, i.e., chromium depletion formation resulting from the precipitatio…
The effect of strontium doping in K 0.5 Na 0.5 NbO 3 (KNN) ceramics in the amount of 0.5, 2, 5 and 10 atom % is studied. With increasing dopant content the orthorhombic distortion of the perovskite solid solution is markedly reduced. The density of stoichiometric KNN sintered at 1115°C is 94.4% of TD, doping with 0.5%…
Abstract Copper deposition into ordered macroporous silicon prepared in p‐type substrates was investigated by immersion plating and electrochemical deposition in an aqueous solution containing Cu 2+ ions. When the sample was immersed in 0.1 M CuSO 4 solution at the open circuit potential, Cu crystallites are clearly o…
Silk has a long history of use in medicine as sutures. To address the requirements of a mechanically robust and biocompatible material, basic research to clarify the role of repeated sequences in silk fibroin in its structures and properties seems important as well as the development of a processing technique suitable…
In order to understand the interactions of inorganic and organic species from solution with mineral surfaces, and more specifically, with the growth and dissolution behavior of minerals, we start by reviewing the most basic level of interaction. This is the influence of single monovalent ions on the growth and dissolu…
Raman and optical microscopy were used to investigate possible interactions between polyaniline (PANI) and different insulating polymers in conducting blends. Resonance Raman and optical micrographs were used to study the physical interaction in materials. Analysis Raman spectra was done investigating the relative int…
Surface-enhanced Raman scattering (SERS) has been studied using a silver-coated porous glass-ceramic material as a new type of substrate. The porous glass-ceramic is in the CaO-TiO2-P2O5 system prepared by controlled crystallization and subsequent chemical leaching of the dense glass-ceramic, leaving a solid skeleton…
Grading is the process used to create sized patterns. Our research continues from the finding that grading practice is not based on anthropometric data (Schofield & LaBat, 2005). The focus of this research was to establish proportional rules, set increments, and assumptions that form the basis of grading. The grad…
A description is presented of present efforts to make thin-films for ferroelectric memory devices into truly three-dimensional objects, such as nano-tubes, nano-rods, and nano-ribbons. These may have important applications for DRAM trenched capacitors. A summary of state-of-the-art magnetic RAM (MRAM) and ferroelectri…
Nanobelts of ZnO have well-defined shapes that are enclosed by {0001}, {01 \(\stackrel{\textstyle{{\bar}}}{1}\) 0} and {21 \(\stackrel{\textstyle{{\bar}}}{1}\) 0} facets. The nanobelts grow along [01 \(\stackrel{\textstyle{{\bar}}}{1}\) 0] and [2 \(\stackrel{\textstyle{{\bar}}}{1}\) \(\stackrel{\textstyle{{\bar}}}{1}\…
The transformation of nanodiamonds into carbon-onions (and vice versa) has been observed experimentally and has been modelled computationally at various levels of sophistication. Also, several analytical theories have been derived (by a number of research groups) to describe the size, temperature and pressure dependen…
Three photosensitive cholesteric liquid crystal mixtures have been investigated as UV sensors. Each of them is sensitive to a well definite part of the solar UV radiation spectrum, the UV A or the UV B or the UV C range, with suitable absorption spectra. The photosensitive elements in the mixtures are either photoisom…
We investigated the etching behaviors of GST, which has been mainly employed for the realization of phase-change type nonvolatile memory devices, using high-density helicon plasma etching system under the various etching gas conditions. Our results provide the etch rates of GST thin films as a function of gas mixing r…
The design and synthesis of new biomaterials, particularly those derived from biomolecule-based monomers, remains an area of considerable research effort. Herein the synthesis and characterization of poly(carbonate-acetal)s based on stabilized dimer forms of the glucolytic metabolite, dihydroxyacetone, are reported. T…
Abstract We report surface‐enhanced hyper Raman scattering (SEHRS) from molecules in silver colloidal solutions using high repetition rate mode‐locked picosecond excitation at 1064 nm. SEHRS was is studied under non‐resonant and resonant conditions by choosing adenine and crystal violet as test molecules. Compared wit…
Abstract Nanoscaled materials of organic dyes are of interest for a variety of potential applications because of the rich photonic properties that this class of molecules can impart. One mode to form such nanoscaled materials is via self‐organization and self‐assembly, using reasonably well understood methods in supra…
X-ray diffraction analysis, Auger electron spectroscopy, X-ray photoelectron spectrometry, optical micrography, and spot potential measurements have been used to characterise AISI 316L stainless steel specimens with oxide films formed by heating in air, either isothermally (at 200–1000°C) or in a temperature gradient.…