Materials Literature
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α and β rhombohedral boron are closely related structures with nearly identical stability. Unlike a, in which every site is fully occupied, β is characterized by partial occupancy and intrinsic disorder. Optimizing the site occupation yields a superstructure of β that we call β'. Its energy is lower than α but its sym…
Lead-free potassium lithium tantalate niobate single crystal with the composition of K 0.95 Li 0.05 Ta 0.61 Nb 0.39 O 3 has been grown by the top-seeded solution growth method. The dielectric and piezoelectric properties of the as-grown crystal have been investigated. From the experimental results, the orthorhombic–te…
Composites made from polypropylene and lignocellulosic materials derived from plants were subjected to acoustic and mechanical investigations. Sound absorption coefficients for these composites were measured using the acoustic standing wave method in the frequency range from 1000 to 6500Hz. This work shows that the fr…
A complete series of solketal octasubstituted phthalocyanines have been synthesized, with peripheral (β) or non-peripheral (α) substitution pattern. Their 13 C NMR and UV-vis properties are compared relatively to this substitution pattern or the nature of the central metal ( Ni , Zn or H 2 ).
Nanoporous energetic silicon is a promising new energetic material that can be integrated on-chip using current silicon bulk micromachining techniques. In this paper, we present the characteristics of the nanoenergetic reaction, including energy output, gas generation, and chemical products. The energy output is measu…
We present ab initio molecular dynamics calculations based on density functional theory to study the hydrogen-deuterium exchange in bulk and nanoclusters of MgH2. Our calculations reveal the important role of catalysts to diffuse the hydrogen at low temperatures and increase the diffusion rate. We determine the diffus…
Orientational order parameters (OOP's) have been determined in the Smectic A, Smectic C1 and Smectic C2 phases of a hockey stick-shaped compound from X-ray diffraction measurements and compared with NMR measurements. While the OOP values from NMR measurements abruptly drop at the Smectic C1 to Smectic C2 transition, t…
The coordinate of a notch and its depth and length are found from three eigenfrequencies of bending vibrations. The notch is a model of a flaw in a bar, in particular, of a transverse open crack. Taking into account that the crack propagates from a small nucleus and not necessarily from the most stressed cross section…
The electrothermal technique is developed to simultaneously measure the specific heat and thermal conductivity of individual thin samples suspended across two heat sinks, resorting to pulsed direct currents with or without a dc offset. The temperature evolution due to Joule self-heating is recorded and compared with t…
Abstract Siloxane coatings were deposited using two different atmospheric plasma systems namely a reel‐to‐reel atmospheric plasma liquid deposition system called Labline™ and an atmospheric plasma jet system called PlasmaStream™. Both systems combine an atmospheric plasma, with the use of liquid precursors. The influe…
We investigated the glass former m-tricresyl-phosphate confined in different nanoporous silica matrices with defined pore radii from 2-150 nm. While applying different 31P NMR techniques, we were able to detect the extremely stretched correlation functions extending over 7-8 decades in time and reflecting strong dynam…
Combining hybrid nanostructures of metal nanoparticles (NPs) and carbon nanotubes could afford a novel strategy to prepare promising nanomaterials for the highly sensitive sensors and imaging science applications. Conventional acid oxidation process was used to obtain carboxylic acid bound multi-walled carbon nanotube…
The synthesis and spectroscopic characterization of tetraimidazophthalocyanines are presented. This kind of molecules have not been intensively studied due to difficulty in (i) obtaining an easily obtainable synthon: a benzimidazole ring with a variety of substituent, and (ii) achieving the Rosenmund-Von Braun reactio…
We study colloidal particle dynamics of a model glass system using confocal and fluorescence microscopy as the sample evolves from a hard-sphere glass to a liquid with attractive interparticle interactions. The transition from hard-sphere glass to attractive liquid is induced by short-range depletion forces. The devel…
Além dos baixos teores normalmente encontrados na fração argila dos solos sob clima tropical e subtropical, o tamanho reduzido e a baixa cristalinidade dos minerais 2:1 secundários dificultam sua identificação por difratometria de raios X (DRX). Este estudo objetivou avaliar métodos químicos e físico de concentração d…
The aim of this article is to study the effect of antioxidants on cure properties and aging behaviour of ethylene propylene diene rubber (EPDM) and EPDM/low density polyethylene (LDPE) blends. Dicumyl peroxide cured EPDM and EPDM/LDPE blends are prepared with three categories of antioxidants, including: amine, N-isopr…
O setor sucroalcooleiro tem apresentado um expressivo crescimento nos últimos anos no Brasil, entretanto, a manutenção das indústrias apresenta um elevado custo devido à perda de metal dos equipamentos por mecanismos de desgaste. O objetivo deste trabalho é avaliar a resistência ao desgaste abrasivo e a microestrutura…
Electronic band structures of nanostructured LaNiO3 (LNO) and La0.5Sr0.5CoO3 (LSCO) films have been investigated by near-normal incident optical reflectance at room temperature. Dielectric constants of the conductive films in the photon energy range of 0.47–6.5 eV have been extracted with the Drude–Lorentz function. I…
Article Production of Polymer Matrix Composite Particleboard from Pistachio Shells and Improvement of its Fire Resistance by Fly Ash was published on June 1, 2009 in the journal High Temperature Materials and Processes (volume 28, issue 3).
Abstract We report on our progress in using polymer Polarization Gratings (PGs) to enhance the brightness of standard Liquid Crystal (LC) microdisplays. By replacing conventional polarizers with PGs, high transmittance (>85%) and contrast ratios (>300:1) can be achieved with common LC modes and unpolarized input…