Materials Literature
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The first part of the paper deals with the computation of stress intensity factors for pyramidal indentation cracks with a ratio of crack length c to indentation half-diagonal a between 1 and 2. The residual stress field due to quasi-plastic deformation below the indenter is described by using the Hill model of an exp…
Mixtures of chrysotile (Mg6Si4O10(OH)8) and CaCO3 were burned at temperatures ranging from 500°C to 1000°C; the decomposition temperature of chrysotile was lowered by adding CaCl2. Thermal analysis and succeeding SEM observation confirmed the formation of melts, which was supposed to be responsible for the effect of t…
The FTIR spectra of poly(ether imide) films prepared from their chloroform solutions were recorded in a wide temperature interval. The cast films were shown to contain residual solvent. This residual solvent existed in films as unbound chloroform that may be removed by heating to 60–70°C and as bound chloroform that i…
Novel silicon-deficient mullite (Al5.65Si0.35O9.175) single crystal nanowires were synthesized in large quantities on mica substrates assisted by the intermediate fluoride species. The nanowires have diameters in the range 50-100 nm and typical lengths of several microm. Aligned nanowires were observed at the substrat…
Commercial sub-micron high purity α-Al2O3 powders ground and not ground in the manufacturing process, produced by three different processes; in-situ chemical vapor deposition (A1, A2 and A3), hydrolysis of aluminum alkoxide (B1, B2 and B2) and thermal decomposition of ammonium alum (C1 and C2) methods, were thermally…
A thermal manikin is a useful tool to evaluate thermal environments such as clothing, houses and others. A manikin needs to have the following properties: shape and size, heat production, skin temperature, sweat rate, physiological responses and others. So far, no manikin satisfying all these criteria has been availab…
In this work we present a deterministic numerical scheme solving the one-dimensional Boltzmann--Poisson system for semiconductor materials with a complicated band structure such as GaAs. The model is based on a system of two kinetic equations for the electron population in each of the relevant valleys coupled through…
A highly strained non-luminescent dibenzo-acridinium cationic compound is identified that undergoes in acetonitrile light-induced ring closure to create a highly fluorescent, planar, eight-ringed cationic anti-aromatic dye.
Blends of two highly crystalline polymers containing an elastomer were prepared to study the glass transition of the confined elastomer. The polymers chosen were high density poly ethylene (HDPE), polypropylene (PP), and two elastomers of a different nature: natural number (NR) and EPDM. The dynamic mechanical analyze…
Upconversion spectra of Er/Tm codoped NaY(WO(4))(2) crystal excited by 974nm laser is investigated. Intensive 520nm/550nm and 800nm emissions are observed. Three-photon process at high pumping power is presented in the green upconversion. A model is proposed that the three-photon process is actualized by the energy in…
Energy migration in self-assembled, water soluble, quantum dot (QD) nanoclusters is reported. These spherical nanoclusters are composed of CdSe QDs bound together by pepsin, a digestive enzyme found in mammals. A structural model for the clusters is suggested, based on scanning transmission electron microscopy, as wel…
Termoplásticos modificados com elastômeros têm despertado grande interesse de pesquisadores e de indústrias devido à atraente relação custo/benefício e a possibilidade de aumento significativo da tenacidade sob impacto de polímeros frágeis com a incorporação de uma fase borrachosa dispersa. Este artigo mostra a relaçã…
We present preparation of Ge nanostructures formed using by femtosecond laser pulse and origin of visible photoluminescence (PL) properties. High intensity of incident laser energy gives rise to make oxidized layer to surface of Ge nanoparticle after irradiation. Moreover, size dependent Raman shift and PL spectrums a…
meso-Tetraphenylporphyrin and its β-nitro zinc complex derivative react at higher temperature with unstable alkyl nitrile oxides affording isoxazoline-fused chlorins according to dipolar [3+2]-cycloaddition pathway.The respective nitrile oxides were in situ generated from the corresponding nitroalkanes in the presence…
Two modified beta-cyclodextrins (beta-CDs) with a thymine dimer and a thymine oxetane adduct respectively, TD-CD and Ox-CD, have been prepared, and utilized to bind an electron-rich chromophore, indole or N,N-dimethylaniline (DMA), to form a supramolecular complex. We have examined the photosensitized splitting of the…
We have demonstrated circularly polarized light-induced chirality in polymer thin films containing azobenzene linkages in their main-chain backbone. The material used in this study was an amorphous main-chain polyazourea with a high glass transition temperature, which was used to form the fine surface relief gratings.…
We conducted this study to clarify the relationship between manganese solubility and grain sizes of Mg-Al alloys. Mg-5%Al, Mg-9%Al, and Mg-11%Al alloys were prepared using high-purity magnesium (>99.99%) and aluminum (99.99%). These alloys were melted at 1123 K by adding electrolytic manganese (99.99%) and solidified…
In this manuscript we review the structure of the novel 1-D chain complex, {[PtRh(PVM)2(NH3)2Cl2.5]2[Pt2(PVM)2 (NH3)4]2(PF6)6. 2MeOH. 2H2O}n (4) (PVM = pivalamidate), consisting of mixed-valence dimeric complexes with appreciably extended metal–metal bondings. Compound 4 is made up of octameric segments, each of which…
Severe plastic deformation has the fascinating power of alloying equilibrium-immiscible elements, overriding the thermodynamic driving force (positive heat of mixing) that would dictate phase separation in equilibrium. This article briefly reviews the current understanding of this subject, in terms of experimental evi…
An Edge‐on Impact (EOI) technique, developed at the Ernst‐Mach‐Institute (EMI), coupled with a Cranz‐Schardin high‐speed camera, has been successfully utilized to visualize dynamic fracture in many brittle materials. In a typical test, the projectile strikes one edge of a specimen and damage formation and fracture pro…